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Fumaric Acid

HCID 444972
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Basic information

CAS
110-17-8
Standard SMILES
O=C(O)/C=C/C(=O)O
InChIKey
VZCYOOQTPOCHFL-OWOJBTEDSA-N
Molecular formula
C4H4O4
Average molar mass
116.07 g/mol
Monoisotopic mass
116.0109586

Names & identifiers

Preferred name
Fumaric Acid
IUPAC
(E)-but-2-enedioic acid
English name
Fumaric acid
Molecular formula
C4H4O4
Molecular weight
116.07

Names & synonyms

fumaric acid110-17-8trans-Butenedioic acidAllomaleic acidLichenic acidBoletic acid(2E)-but-2-enedioic acidTumaric acidtrans-1,2-Ethylenedicarboxylic acid(E)-2-Butenedioic acidAllomalenic acidtrans-2-Butenedioic acid
Show more names
FAfumaric2-BUTENEDIOIC ACIDButenedioic acidACIDUM FUMARICUMFumaric acid, extra pureFEMA 2488TRANS-2-BUTEN-1,4-DIOIC ACIDTenofovir Disoproxil Fumarate impurity R
Fumaricum acidum2-Butenedioic acid, (E)-Kyselina fumarova(2E)-2-butenedioic acid(E)-but-2-enedioic acidUSAF EK-P-583Butenedioic acid, (E)-FEMA No. 2488

Database identifiers

CAS
110-17-8、6915-18-0
PubChem CID
444972
DTXSID
DTXSID3021518
ChEMBL
CHEMBL503160
ChEBI
CHEBI:18012
UNII
88XHZ13131
EC Number
203-743-0
Nikkaji
J2.880K、J292.521D

Properties

Computed structural propertiesFilling in

XLogP
-0.3
Topological polar surface area
74.6 Ų
Hydrogen bond donors
2
Hydrogen bond acceptors
4
Rotatable bonds
2
Heavy atoms
8
Formal charge
0
Complexity
119

Experimental & physicochemical properties

pH3,0-3,2 (0,05 % solution at 25 °C)
LogP · 4 items

0.46

log Kow = 0.46

0.46

0.46 (estimated)

OdorOdorless
TasteFruit acid
Density · 4 items

1.635 at 68 °F (USCG, 1999) - Denser than water; will sink

1.635 g/cu cm at 20 °C

IT HAS AN EXTREMELY LOW RATE OF MOISTURE ABSORPTION; BULK DENSITY: 32.6 LB/CU FT; STANDARD FREE ENERGY OF ANION FORMATION: -144.41 @ 25 °C; BUFFERING INDEX 3.46

Density (at 20 °C): 1.64 g/cm³

Color/Form · 3 items

Needles, monoclinic prisms or leaflets from water

Colorless crystals

WHITE CRYSTALLINE POWDER

Solubility · 6 items

less than 1 mg/mL at 72 °F (NTP, 1992)

7000

Soluble in ethanol, concentrated sulfuric acid; slightly soluble in ethyl ether, acetone

Soluble in alcohol 5.76 g/100 g at 30 °C. Insoluble in chloroform and benzene

in 100 g 95% alcohol at 30 °C: 5.76g; in 100 g acetone at 30 °C: 1.72 g; in 100 g ether at 25 °C: 0.72 g

Safety & regulation

Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.

GHS classification

GHS Classification · 6 items

Warning

H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]

P264+P265, P280, P305+P351+P338, and P337+P317 (click each P-code to see the statement)

This chemical does not meet GHS hazard criteria for 0.4% (13 of 3331) of reports.

Hazard information

Regulatory Information · 6 items

Chemical: 2-Butenedioic acid, (E)-

Regulation (EC) No 1831/2003 (amended)

2-Butenedioic acid (2E)- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of 2-Butenedioic acid (2E)- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 21-02-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15099;Status: Active Update: 15-06-2011 https://echa.europa.eu/registration-dossier/-/registered-dossier/6159;Status: Active Update: 14-12-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/25887

Fumaric acid: Does not have an individual approval but may be used under an appropriate group standard

The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)

Other Safety InformationIMAP assessments - 2-Butenedioic acid, (E)-: Human health tier I assessment;IMAP assessments - 2-Butenedioic acid, (E)-: Environment tier I assessment
Fire Hazards · 2 items

Special Hazards of Combustion Products: Irritating fumes of maleic anhydride may form in fires.;Behavior in Fire: Dust presents explosion hazard; knock down dust with water fog. (USCG, 1999)

Combustible. Gives off irritating or toxic fumes (or gases) in a fire. Finely dispersed particles form explosive mixtures in air.

Chemistry & industry

Pharmacology

ATC Code · 2 items

D - Dermatologicals;D05 - Antipsoriatics;D05A - Antipsoriatics for topical use;D05AX - Other antipsoriatics for topical use;D05AX01 - Fumaric acid

QD - Dermatologicals;QD05 - Drugs for keratoseborrheic disorders (atc human: antipsoriatics);QD05A - Drugs for keratoseborrheic disorders, topical use (atc human: antipsoriatics for topical use);QD05AX - Other drugs for keratoseborrheic disorders for topical use (atc human: other antipsoriatics for topical use);QD05AX01 - Fumaric acid

Metabolism/Metabolites · 1 item

Fumarate is an intermediate in the citric acid cycle used by cells to produce energy in the form of adenosine triphosphate (ATP) from food. It is formed by the oxidation of succinate by the enzyme succinate dehydrogenase. Fumarate is then converted by the enzyme fumarase (fumarate hydratase) to malate.

Absorption, Distribution and Excretion · 1 item

The total activity of labeled carbon dioxide in the blood entering and leaving the brain was determined following a single injection of fumarate-2-(14)C in four normal human subjects. Blood samples were drawn simultaneously from the femoral artery and the superior bulb of the internal jugular vein. Also, cerebrospinal fluid specimens were collected. Evidence from the experiments indicates that there was an immmediate formation of (14)CO2 by the brain after injection of the isotope. It suggests that fumarate penetrates the blood-brain barrier with little difficulty.

Tissue LocationsPlacenta;Prostate
Cellular LocationsExtracellular;Membrane;Mitochondria
Metabolite Pathways · 1 item

2-ketoglutarate dehydrogenase complex deficiency;Adenine phosphoribosyltransferase deficiency (APRT);Adenosine Deaminase Deficiency;Adenylosuccinate Lyase Deficiency;AICA-Ribosiduria;Alkaptonuria;Arginine and proline metabolism;Arginine: Glycine Amidinotransferase Deficiency (AGAT Deficiency);Argininemia;Argininosuccinic Aciduria;Total 65 pathways, visit the HMDB page for details

Related reactions

2,770 records
New reaction record
HRID 1031 reaction equation
HRID 1031As reactantuspto-grants-1998_03
HRID 1032 reaction equation
HRID 1032As reactantuspto-grants-1998_03
HRID 1033 reaction equation
HRID 1033As reactantuspto-grants-1998_03
HRID 1034 reaction equation
HRID 1034As reactantuspto-grants-1998_03
HRID 1035 reaction equation
HRID 1035As reactantuspto-grants-1998_03
HRID 1040 reaction equation
HRID 1040As reactantuspto-grants-1998_03
HRID 2524 reaction equation
HRID 2524As reactantuspto-grants-1998_03
HRID 2528 reaction equation
HRID 2528As reactantuspto-grants-1998_03
Page 1 of 347

Compound notes

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Almost insoluble in olive oil, ... carbon tetrachloride, xylene, ... molten camphor, liquid ammonia.

Flash Point · 3 items

273 °C (open cup)

230 °C (closed cup)

273 °C

Boiling Point · 3 items

329 °F at 1.7 mmHg ; sublimes (NTP, 1992)

522

Sublimes at 200 °C

Melting Point · 5 items

572 to 576 °F (NTP, 1992)

287

286-302 °C (closed capillary, rapid heating)

287 °C decomposes

549 °C

Vapor Pressure · 2 items

0.000154 [mmHg]

1.54X10-4 mm Hg at 25 °C

Heat of Combustion-4,970 Btu/lb = 2,760 cal/g = -116X10+5 J/kg

Physicochemical properties

Melting point
298 · 298-300 °C (subl.) (lit.)
Boiling point
137.07 °C · 137.07°C (rough estimate)
Density
1.62 · 1.62
vapor pressure
1.7 mm · 1.7 mm Hg ( 165 °C)
refractive index
1.526 · 1.5260 (estimate)
FEMA
2488 · 2488 | FUMARIC ACID
FLAVIS Number
8.025 · 08.025 | Fumaric acid
Flash point
230 °C · 230 °C
storage temp.
30 °C · Store below +30°C.
solubility
95 % · 95% ethanol: soluble0.46g/10 mL, clear, colorless
form
Fine Crystalline Powder
pka
3.02 · 3.02, 4.38(at 25℃)
color
White
PH
3.19 · 3.19(1 mM solution);2.57(10 mM solution);2.03(100 mM solution);
Odor
odorless
Odor Type
odorless
biological source
synthetic
explosive limit
40 % · 40%
Water Solubility
0.63 g/100 · 0.63 g/100 mL (25 ºC)
Specific Heat Capacity
1.22 J/ · Cp(crystal): 1.22 J/(g·K), at 25℃
JECFA Number
618 · 618
Merck
14 · 14,4287
BRN
605763 · 605763
Stability
230 C · Stable at room temperature. Decomposes at around 230 C. Incompatible with strong oxidizing agents, bases, reducing agents. Combustible.
Cosmetics Ingredients Functions
BUFFERING
Cosmetic Ingredient Review (CIR)
Fumaric acid (110-17-8)
InChI
1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1+
InChIKey
VZCYOOQTPOCHFL-OWOJBTEDSA-N
SMILES
OC(=O)\C=C\C(O)=O
LogP
-4.02 at · -4.02 at 20℃
CAS DataBase Reference
110 · 110-17-8(CAS DataBase Reference)
Indirect Additives used in Food Contact Substances
-2 · (E)-2-BUTENEDIOIC ACID
Substances Added to Food (formerly EAFUS)
FUMARIC ACID
FDA 21 CFR
175.105 · 175.105; 175.300; 175.320;176.170; 176.180; 177.1200;177.1500; 177.2420
EWG's Food Scores
1 · 1
FDA UNII
88 XHZ13131 · 88XHZ13131
ATC code
5 AX01 · D05AX01
NIST Chemistry Reference
Fumaric acid(110-17-8)
EPA Substance Registry System
Fumaric acid (110-17-8)
UNSPSC Code
41116107 · 41116107
NACRES
71 · NA.71
Symbol(GHS)
7 · GHS07
Signal word
Warning
Hazard statements
319 · H319
Precautionary statements
264 · P264-P280-P305+P351+P338-P337+P313
PPE
95 · dust mask type N95 (US), Eyeshields, Gloves
Hazard Codes
Xi
Risk Statements
36 · 36
Safety Statements
26 · 26
RIDADR
9126 · UN 9126
WGK Germany
1 · 1
RTECS
9625000 · LS9625000
Autoignition Temperature
375 °C · 375 °C
TSCA
TSCA listed
HS Code
29171900 · 29171900
Storage Class
11 · 11 - Combustible Solids
Hazard Classifications
2 · Eye Irrit. 2
Hazardous Substances Data
110 · 110-17-8(Hazardous Substances Data)
Toxicity
50 orally · LD50 orally in Rabbit: 9300 mg/kg LD50 dermal Rabbit 20000 mg/kg
REACH Registrations
Active
Fire PotentialSLIGHT
Health HazardsInhalation of dust may cause respiratory irritation. Compound is non-toxic when ingested. Prolonged contact with eyes or skin may cause irritation. (USCG, 1999)
Hazards SummaryA skin, eye, and respiratory tract irritant; [ICSC] A skin, eye, nose, and throat irritant; [HSDB] An eye irritant; [eChemPortal: ERMA; ESIS] A mild skin and moderate eye irritant based on animal studies; [MSDSonline]
FDA Requirements · 2 items

Fumaric acid and its calcium, ferrous, magnesium, potassium, and sodium salts may be safely used in food in accordance with the following prescribed conditions: (a) The additives meet the following specifications: (1) Fumaric acid contains a minimum of 99.5 percent by weight of fumaric acid, calculated on the anhydrous basis. (2) The calcium, magnesium, potassium, and sodium salts contain a minimum of 99 percent by weight of the respective salt, calculated on the anhydrous basis. Ferrous fumarate contains a minimum of 31.3 percent total iron and not more than 2 percent ferric iron. (b) With the exception of ferrous fumarate, fumaric acid and the named salts are used singly or in combination in food at a level not in excess of the amount reasonably required to accomplish the intended effect. (c) Ferrous fumarate is used as a source of iron in foods for special dietary use, when the use is consistent with good nutrition practice.

Fumaric acid is an indirect food additive for use only as a component of adhesives.

Reactive GroupAcids, Carboxylic;Hydrocarbons, Aliphatic Unsaturated
EC ClassificationSymbol: Xi; R: 36; S: (2)-26
Special Reports · 2 items

European Commission, ESIS; IUCLID Dataset, Fumaric acid (110-17-8) (2000 CD-ROM edition) contains information on use, toxicology, and environmental effects of this chemical as supplied to the European Union by industry.[Available from, as of February 25, 2010: http://esis.jrc.ec.europa.eu/]

FAO/WHO Joint Expert Committee on Food Additives; WHO Food Additives Series 9: Fumaric acid (1975).[Available from, as of February 25, 2010: http://www.inchem.org/pages/jecfa.html]

EPA Safer ChemicalChemical: Fumaric acid; Green circle - The chemical has been verified to be of low concern based on experimental and modeled data.
FIFRA Requirements · 1 item

Unless specifically excluded, residues resulting from the use of the following substances as either an inert or an active ingredient in a pesticide chemical formulation, including antimicrobial pesticide chemicals, are exempted from the requirement of a tolerance under FFDCA section 408, if such use is in accordance with good agricultural or manufacturing practices. Fumaric acid is included on this list.

Safety & protection

Fire FightingUse water spray, dry powder, foam, carbon dioxide.
First Aid Measures · 4 items

Fresh air, rest.

Rinse skin with plenty of water or shower.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Rinse mouth.

First Aid · 1 item

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.;SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.;INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing.;INGESTION: DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital. (NTP, 1992)

Safe StorageSeparated from oxidizing materials.
Fire Fighting Procedures · 3 items

If material on fire or involved in fire: use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use foam, dry chemicals, or carbon dioxide.

Suitable extinguishing media: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.

Special protective equipment for fire-fighters: Wear self contained breathing apparatus for fire fighting if necessary.

Storage Conditions · 2 items

The bulk material should be stored in a well-closed container in a cool, dry place.

Store in cool place. Keep container tightly closed in a dry and well-ventilated place.

Cleanup Methods · 5 items

Environmental considerations - land spill: Dig a pit, lagoon, holding area to contain liquid or solid material. /SRP: If time permits, pits, ponds, lagoons, soak holes, or holding areas should be sealed with an impermeable flexible membrane liner./ Cover solids with a plastic sheet to prevent dissolving in rain or fiefighting water. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3).

Environmental considerations - water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Adjust pH to neutral (pH = 7). Use mechanical dredges or lifts to remove immobililzed masses of pollutants and precipitates.

Personal precautions: Use personal protective equipment. Avoid dust formation. Avoid breathing dust. Ensure adequate ventilation.

Environmental precautions: Do not let product enter drains.

Methods for cleaning up: Pick up and arrange disposal withour creating dust. Keep in suitable, closed containers for disposal.

Disposal Methods · 4 items

SRP: Criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

SRP: Expired or waste pharmaceuticals shall carefully take into consideration applicable DEA, EPA, and FDA regulations. It is not appropriate to dispose by flushing the pharmaceutical down the toilet or discarding to trash. If possible return the pharmaceutical to the manufacturer for proper disposal being careful to properly label and securely package the material. Alternatively, the waste pharmaceutical shall be labeled, securely packaged and transported by a state licensed medical waste contractor to dispose by burial in a licensed hazardous or toxic waste landfill or incinerator.

SRP: At the time of review, regulatory criteria for small quantity disposal are subject to significant revision, however, household quantities of waste pharmaceuticals may be managed as follows: Mix with wet cat litter or coffee grounds, double bag in plastic, discard in trash.

Observe all federal, state, and local environmental regulations. Contact a licensed professional waste disposal service to dispose of this material. Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber.

Spillage Disposal · 1 item

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Then store and dispose of according to local regulations.

Preventive Measures · 5 items

SRP: The scientific literature for the use of contact lenses by industrial workers is inconsistent. The benefits or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.

If material not on fire and not involved in fire: keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary.

Personnel protection: avoid breathing vapors or dusts ... Do not handle broken packages unless wearing appropriate personal protective equipment. Wash away any material which may have contacted the body with copious amounts of water or soap and water.

Handling: Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Provide appropriate exhaust ventilation at places where dust is formed. Normal measures for preventive fire protection.

For more Preventive Measures (Complete) data for Fumaric acid (7 total), please visit the HSDB record page.

Eye PreventionWear safety goggles.
Fire PreventionNO open flames. Prevent deposition of dust. Closed system, dust explosion-proof electrical equipment and lighting.

Toxicology

Treatment · 1 item

Acute exposure: EYES: irrigate opened eyes for several minutes under running water. INGESTION: do not induce vomiting. Rinse mouth with water (never give anything by mouth to an unconscious person). Seek immediate medical advice. SKIN: should be treated immediately by rinsing the affected parts in cold running water for at least 15 minutes, followed by thorough washing with soap and water. If necessary, the person should shower and change contaminated clothing and shoes, and then must seek medical attention. Chronic Exposure: There is no treatment for fumarase deficiencies. Only palliative care is possible. For cancers caused by intracellular fumarate excess, there are a wide variety of cancer treatments including drugs and surgery.

Interactions · 5 items

The inhibitory effect of fumaric acid (FA) on hepatocarcinogenesis was examined in mice fed thioacetamide (TAA). A group of male ICR mice was fed TAA at a level of 0.035% in the diet for 40 weeks and then fed a basal diet for 48 weeks. Hepatic tumors developed in 11 of the 24 animals of this group and they were diagnosed as hepatocellular carcinomas. However, cirrhotic lesions and the enlargement of hepatocyte nucleoli were not as marked in mice as in previous findings in rats fed TAA. The effect of FA on the carcinogenesis was examined in a group of mice fed this compound at a level of 1% in a basal diet after ingestion of TAA. The inhibitory effect of FA on TAA carcinogenesis was so marked that no hepatic carcinomas were found in any of the 15 animals fed FA in combination with TAA.

The ability of a substance to reduce the yield of azoxymethane (AOM)-induced foci in the colon of male Fischer 344 rats, was evaluated as a screening assay for chemopreventive agents. Twenty-eight test agents were administered continuously in the diet from the start of the experiments until the animals were killed 35 days later. AOM was sc administered either as 15 mg/kg bw on days 7 and 14 or as 30 mg/kg bw on day 7 of the experiment. Foci of aberrant crypts were evaluated in whole mounts of methylene blue-stained colons. AOM induced twice as many foci when administered between 8.40 and 11.00 a.m. than between 2.45 and 5.55 p.m. Calcium salts of carbonate, chloride and glucarate decreased the yield of AOM-induced foci while the acidic salts of lactate and phosphate did not inhibit the formation of foci. Dimethyl-fumarate, fumaric acid, genistein, piroxicam, simethicone, sodium suramin and sulindac reduced the yield of AOM-induced foci of aberrant crypts, with genistein being the most potent ...

The liver of mice treated with mitomycin C showed perinuclear irregularity, aggregation of chromatin, and abnormal cytoplasmic organelles. The concurrent admin of fumaric acid reduced the incidence of such deleterious changes. The action of fumaric acid against mitomycin C intoxication was even more apparent in the kidney.

Fumaric acid when reacted with chlorine in an aqueous soln was not mutagenic when tested in the Ames test using Salmonella typhimurium TA 100. When a 50/50 by vol methanol/water mixture was used for chlorination, fumaric acid was mutagenic with a peak at 3 equivalents of chlorine per mole.

For more Interactions (Complete) data for Fumaric acid (9 total), please visit the HSDB record page.

Health Effects · 1 item

Acute exposure to fumaric acid can cause skin redness (skin contact), cough or sore throat (inhalation), abdominal cramps, nausea and diarrhea (ingestion). Chronically high levels of fumaric acid are associated with at least 3 inborn errors of metabolism including: 2-Ketoglutarate dehydrogenase complex deficiency, Fumarase deficiency and Pyruvate carboxylase deficiency. Fumarase deficiency causes encephalopathy, severe mental retardation, unusual facial features, brain malformation, and epileptic seizures. High intracellular fumaric acid levels are associated with the development of renal cancer, leiomyomata, renal cysts, and tumors.

Ecotoxicity Values · 4 items

LC50; Species: Brachydanio rerio (Zebrafish); Conditions: static; Concentration: 245 mg/L for 48 hr

EC50; Species: Daphnia magna (Water flea, age <24 hr larvae, 1st instar); Conditions: freshwater, static, 22 °C, pH 7.7 (7.0-8.2), hardness 154.5 mg/L CaCO3 (89.5-180 mg/L CaCO3), alkalinity 137.7 mg/L CaCO3 (95-156 mg/L CaCO3); Concentration: 212000 ug/L for 48 hr (95% confidence interval: 204000-220000 ug/L); Effect: intoxication, immobilization

EC50; Species: Daphnia magna (water flea, first instar <24 hr old); Conditions: static; Concentration: 212 mg/L for 48 hr (95% confidence level 204-220 mg/L); Effect: immobilization

EC50; Species: Scenedesmus subspicatus (green algae); Conditions: UBA algal growth inhibition test; Concentration: 41 mg/L for 72 hr; Effect: Growth rate

Environmental Fate · 3 items

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 7(SRC), determined from a structure estimation method(2), indicates that fumaric acid is expected to have very high mobility in soil(SRC). The pKa values of fumaric acid are 3.03 and 4.54(3), indicating that this compound will exist almost entirely in anion form in the environment and anions generally do not adsorb more strongly to soils containing organic carbon and clay than their neutral counterparts(4). Volatilization of fumaric acid from moist soil surfaces is not expected to be an important fate process(SRC) given its pKa(3). Fumaric acid is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 1.54X10-4 mm Hg(5). Using a Warburg respirometer and a sewage inoculum, 5 day Theoretical BODs of 57-70% were reported(6), suggesting that biodegradation may be an important environmental fate process in soil(SRC).

AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 7(SRC), determined from a structure estimation method(2), indicates that fumaric acid is not expected to adsorb to suspended solids and sediment(SRC). A pKa values of 3.03 and 4.54(3) indicate fumaric acid will exist almost entirely in the anion form at pH values of 5 to 9 and therefore volatilization from water surfaces is not expected to be an important fate process(4). According to a classification scheme(5), an estimated BCF of 3(SRC), from its log Kow of 0.46(6) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Fumaric acid is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions(8). The rate constant for the aqueous reaction of fumaric acid with photochemically produced hydroxyl radicals (pH 4.5-10) is 6.0X10+9/M-sec(9); using a hydroxyl radical concentration of 3X10-17 M in brightly sunlit natural water(10), the half-life would be 45 days(SRC). The half-life of fumaric acid in various natural waters ranged from 1-15 days using river die-away studies, indicating that biodegradation is an important environmental fate process in water(11).

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), fumaric acid, which has a vapor pressure of 1.54X10-4 mm Hg at 25 °C(2), will exist in both the vapor and particulate phases in the ambient atmosphere. Vapor-phase fumaric acid is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals and ozone(SRC); the half-lives for these reactions in air are estimated to be 7 hours and 6 days(SRC), calculated from rate constants of 5.3X10-11 cu cm/molecule-sec(3) and 1.8X10-18 cu cm/molecule-sec(4), respectively. Particulate-phase fumaric acid may be removed from the air by wet or dry deposition(SRC). Fumaric acid does not absorb UV light above 290 nm in methanol, acidic methanol, or basic methanol solution(5) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC).

Food Survey Values · 2 items

REPORTED USES: NON-ALCOHOLIC BEVERAGES: 50 PPM; BAKED GOODS: 1300 PPM; GELATINS & PUDDINGS: 3600 PPM.

Fumaric acid is used as a substitute for tartaric acid in beverages and baking powders and as a replacement or partial replacement for citric acid in fruit drinks(1).

Exposure RoutesEndogenous, ingestion, contact (skin and eyes)
Toxicity Summary · 2 items

Safe in the present practices of use and concentration. Ingredient, concentration, and use information are available in documents discoverable at https://cir-reports.cir-safety.org

Acute Toxicity: Fumarate is also an endogenous electrophile and reacts spontaneously with cysteine residues in proteins by a Michael addition reaction to form S-(2-succinyl) cysteine, a process termed succination. Lachrymators such as fumarate are thought to act by attacking sulfhydryl functional groups in enzymes. One of the most probable protein targets is the TRPA1 ion channel that is expressed in sensory nerves (trigeminal nerve) of the eyes, nose, mouth and lungs. Chronic Toxicity: Fumarate is increasingly being identified as an oncometabolite. Fumarase or fumarate hydratase (FH) is a tumor suppressor, whose mutation is associated with the development of leiomyomata, renal cysts, and tumors. Loss of FH enzymatic activity results in accumulation of intracellular fumarate which has been proposed to act as a competitive inhibitor of 2-oxoglutarate-dependent oxygenases including the hypoxia-inducible factor (HIF) hydroxylases, thus activating oncogenic HIF pathways. Mitochondrial dysfunction is also associated with FH deficiency. Fumarate hydratase-deficient cells and tumors have been shown to accumulate fumarate to very high levels with multiple consequences including the activation of oncogenic pathways (A15199). Fumarate (and succinate) inhibit the activity or function of other members of the 2-oxoglutarate-dependent oxygenase superfamily, including histone demethylase enzymes (HDMs) and the TET family of 5-methlycytosine (5mC) hydroxylases which are critical in epigenetic regulation of gene expression.. Fumarate accumulation may also affect cytosolic pathways by inhibiting the reactions involved in the biosynthesis of arginine and purine. More recently it has been found that fumarate promotes p65 phosphorylation and p65 accumulation at the HIF-1α promoter through non-canonical signaling via the upstream Tank Binding Kinase 1 (TBK1). Fumarate is also an endogenous electrophile and reacts spontaneously with cysteine residues in proteins by a Michael addition re

Plant Concentrations · 2 items

Fumaric acid levels in six wild mushroom species, common to the Northeast and Beira Interior regions of Portugal, were as follows (mg/kg): Amanita caesarea and 43.19; Boletus edulis, 11.64-75.16; Gyroporus castaneus 74.65 ; Lactarius deliciosus, 13.18-237.56; Suillus collintus, 49.49-397.16; Xerocomus chrysenteron, 12.77. Samples were collected in 2003(1).

Plants with the highest amount of Fumaric Acid(1). [Table#2020]

Signs and Symptoms · 4 items

Cough. Sore throat.

Redness.

Redness. Pain.

Acute exposure to fumaric acid can cause eye and skin irritation, cough or sore throat (inhalation), abdominal cramps, nausea and diarrhea (ingestion).

Effluent ConcentrationsFumaric acid concentrations of 0.94 and 3.2 ug/cu m were detected in the motor exhaust from a 1982 Toyota Corolla and a diesel engine 1971 Mercedes Benz, respectively(1).
ICSC Environmental DataThe substance is harmful to aquatic organisms.

Regulatory information

Regulatory Information · 6 items

Chemical: 2-Butenedioic acid, (E)-

Regulation (EC) No 1831/2003 (amended)

2-Butenedioic acid (2E)- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of 2-Butenedioic acid (2E)- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 21-02-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15099;Status: Active Update: 15-06-2011 https://echa.europa.eu/registration-dossier/-/registered-dossier/6159;Status: Active Update: 14-12-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/25887

Fumaric acid: Does not have an individual approval but may be used under an appropriate group standard

The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)

FDA Requirements · 2 items

Fumaric acid and its calcium, ferrous, magnesium, potassium, and sodium salts may be safely used in food in accordance with the following prescribed conditions: (a) The additives meet the following specifications: (1) Fumaric acid contains a minimum of 99.5 percent by weight of fumaric acid, calculated on the anhydrous basis. (2) The calcium, magnesium, potassium, and sodium salts contain a minimum of 99 percent by weight of the respective salt, calculated on the anhydrous basis. Ferrous fumarate contains a minimum of 31.3 percent total iron and not more than 2 percent ferric iron. (b) With the exception of ferrous fumarate, fumaric acid and the named salts are used singly or in combination in food at a level not in excess of the amount reasonably required to accomplish the intended effect. (c) Ferrous fumarate is used as a source of iron in foods for special dietary use, when the use is consistent with good nutrition practice.

Fumaric acid is an indirect food additive for use only as a component of adhesives.

FIFRA Requirements · 1 item

Unless specifically excluded, residues resulting from the use of the following substances as either an inert or an active ingredient in a pesticide chemical formulation, including antimicrobial pesticide chemicals, are exempted from the requirement of a tolerance under FFDCA section 408, if such use is in accordance with good agricultural or manufacturing practices. Fumaric acid is included on this list.

Atmospheric Standards · 1 item

This action promulgates standards of performance for equipment leaks of Volatile Organic Compounds (VOC) in the Synthetic Organic Chemical Manufacturing Industry (SOCMI). The intended effect of these standards is to require all newly constructed, modified, and reconstructed SOCMI process units to use the best demonstrated system of continuous emission reduction for equipment leaks of VOC, considering costs, non air quality health and environmental impact and energy requirements. Fumaric acid is produced, as an intermediate or final product, by process units covered under this subpart.

CERCLA Reportable Quantities · 1 item

Persons in charge of vessels or facilities are required to notify the National Response Center (NRC) immediately, when there is a release of this designated hazardous substance, in an amount equal to or greater than its reportable quantity of 5000 lb or 2270 kg. The toll free number of the NRC is (800) 424-8802. The rule for determining when notification is required is stated in 40 CFR 302.4 (section IV.D.3.b).

Clean Water Act Requirements · 1 item

Fumaric acid is designated as a hazardous substance under section 311(b)(2)(A) of the Federal Water Pollution Control Act and further regulated by the Clean Water Act Amendments of 1977 and 1978. These regulations apply to discharges of this substance. This designation includes any isomers and hydrates, as well as any solutions and mixtures containing this substance.

Safety data

PPE
dust mask type N95 (US), Eyeshields, Gloves
wgk
1
tsca
TSCA listed
rtecs
LS9625000
ridadr
UN 9126
hs_code
29171900
Toxicity
LD50 orally in Rabbit: 9300 mg/kg LD50 dermal Rabbit 20000 mg/kg
risk_code
36
Signal word
Warning
Symbol(GHS)
GHS07
hazard_code
Xi
safety_code
26
Storage Class
11 - Combustible Solids
Hazard statements
H319
REACH Registrations
Active
Hazard Classifications
Eye Irrit. 2
Autoignition Temperature
375 °C
Precautionary statements
P264-P280-P305+P351+P338-P337+P313
Hazardous Substances Data
110-17-8(Hazardous Substances Data)

Uses & manufacturing

Uses · 6 items

CIR ingredient: Fumaric Acid

An essential biochemical in the cellular respiration of plants and animals; [Merck Index] Used as a fortifier (paper size resins, unsaturated polyester resins, and alkyd surface coating resins), food antioxidant, dye mordant, and medication; Also used in dentifrices (stain remover) and to make other chemicals; [HSDB] Used in rosin esters and adducts, drying oils, printing inks, and foods (acidulant and flavoring agent); [Hawley]

Pulp and Paper Processing [Category: Industry];Painting (Pigments, Binders, and Biocides) [Category: Paint];Textiles (Printing, Dyeing, or Finishing) [Category: Industry]

For fumaric acid (USEPA/OPP Pesticide Code: 051201) there are 0 labels match. /SRP: Not registered for current use in the U.S., but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses./

Fumaric acid is used primarily in liquid pharmaceutical preparations as an acidulant and flavoring agent. Fumaric acid may be included as the acid part of effervescent tablet formulations, although this use is limited as the compound has an extremely low solubility in water. It is also used as a chelating agent which exhibits synergism when used in combination with other true antioxidants. In the design of novel pelletized formulations manufactured by extrusion-spheronization, fumaric acid was used to aid spheronization, favoring the production of fine pellets. It has also been investigated as an alternative filler to lactose in pellets. Fumaric acid has been investigated as a lubricant for effervescent tablets, and copolymers of fumaric acid and sebacic acid have been investigated as bioadhesive microspheres. It has also been used in film-coated pellet formulations as an acidifying agent and also to increase drug solubility. Fumaric acid is also used as a food additive at concentrations up to 3600 ppm, and as a therapeutic agent in the treatment of psoriasis and other skin disorders.

Reported uses;Table: Reported uses (ppm): (Flavor and Extract Manufacturers' Association) [Table#2022]

Impurities< 20 ppm of heavy metals; <3 ppm iron; <0.1% maleic acid; <0.1% ash
U.S. Exports · 4 items

(1984) Negligible

CHEMICAL PROFILE: Fumaric acid. US Imports: 1991: 2.9 million pounds.

CHEMICAL PROFILE: Fumaric acid. US Imports: 1993: 3.3 million pounds.

CHEMICAL PROFILE: Fumaric acid. US Imports: 1998: 2.7 million pounds; 1999: 1.9 million pounds.

U.S. Imports · 5 items

(1971) 1.1 X 10+8 g (Princpl Custms Dists)

(1975) 3.98 X 10+8 g (Princpl Custms Dists)

(1984) 3.04 X 10+8 g

CHEMICAL PROFILE: Fumaric acid. US Imports: 1988: 4 million pounds.

For more U.S. Imports (Complete) data for Fumaric acid (7 total), please visit the HSDB record page.

U.S. Production · 6 items

2023: 10,000,000 - <25,000,000 lb;2022: 10,000,000 - <25,000,000 lb;2021: 10,000,000 - <25,000,000 lb;2020: 10,000,000 - <25,000,000 lb

(1972) 2.34 X 10+10 g

(1975) 9.46 X 10+9 g

(1984) 2.24 X 10+10 g

2-Butenedioic acid (2E)- is listed as a High Production Volume (HPV) chemical (65FR81686). Chemicals listed as HPV were produced in or imported into the U.S. in >1 million pounds in 1990 and/or 1994. The HPV list is based on the 1990 Inventory Update Rule. (IUR) (40 CFR part 710 subpart B; 51FR21438).

For more U.S. Production (Complete) data for Fumaric acid (10 total), please visit the HSDB record page.

Consumption Patterns · 5 items

31% as a fortifier in paper size resins; 26% as a fortifier in unsaturated polyester resins; 12% as a fortifier in alkyd surface coating resins; 12% as a food acidulant in gelatin desserts and dry beverage powders; 7% as a chemical intermediate for plasticizers including dibutyl fumarate; 12% in miscellaneous applications (1974)

50% is used to produce paper size resins; 20% for food acidulant; 10% for unsaturated polyester resins; 5% for alkyds; 5% for plasticizers; and 10% for miscellaneous (1983)

CHEMICAL PROFILE: Fumaric acid. US End-use Pattern for Fumaric Acid in 1985.;Table: US End-use pattern for fumaric acid in 1985 [Table#2014]

CHEMICAL PROFILE: Fumaric Acid. US End-use Pattern for Fumaric Acid in 1988.;Table: US End-use pattern for fumaric acid in 1988 [Table#2015]

For more Consumption Patterns (Complete) data for Fumaric acid (12 total), please visit the HSDB record page.

Consumer UsesNot Known or Reasonably Ascertainable;Flavoring and nutrient;Dispersing agent
Industry UsesDispersing agent;Flavoring and nutrient;Binder;Other;Processing aids not otherwise specified;Monomers;Fixing agent (mordant);Filler;Not Known or Reasonably Ascertainable;Emulsifier;Intermediate
Methods of Manufacturing · 2 items

Commercially, fumaric acid may be prepared from glucose by the action of fungi such as Rhizopus nigricans, as a by-product in the manufacture of maleic and phthalic anhydrides, and by the isomerization of maleic acid using heat or a catalyst. On the laboratory scale, fumaric acid can be prepared by the oxidation of furfural with sodium chlorate in the presence of vanadium pentoxide.

Maleic acid or maleic anhydride, especially the maleic acid-containing wash water from the production of maleic anhydride or phthalic anhydride, serves as starting material for the manufacture of fumaric acid. The maleic acid concentration should be at least 30%. Maleic acid is converted almost quantitatively by thermal or catalytic isomerization into the sparingly soluble fumaric acid, which is recovered by filtration. Various substances have been proposed as catalysts: mineral acids (e.g., hydrochloric acid); sulfur compounds such as thiocyanates, thiazoles, thiosemicarbazides, thioureas; or bromine compounds in combination with peroxides (e.g., persulfate). Thiourea is most commonly used in practice. The maleic acid-containing wash water contains impurities that can affect quality and yield. This problem can be largely avoided (1) by thermal pretreatment of the wash water, (2) by adding urea if thiourea is used as catalyst, and (3) by addition of sulfites or passaged of sulfur dioxide and addition of mineral acids. The crude fumaric acid obtained is purified by recrystallization from water, combined with purification by active charcoal. Losses during purification are about 10%.

Formulations/Preparations · 4 items

Grades: Technical; crystal; FCC /Food Chemicals Codex/.

ASTM D3504-76 > 99.5%

Resin grade: 99.6%

FCC /Food Chemicals Codex/; fine granular, fine powders, powder (80 mesh) and technical grades.

Household ProductsInformation on 3 consumer products that contain Fumaric acid in the following categories is provided:;• Inside the Home;• Personal Care
Use Classification · 6 items

EPA Safer Chemical Functional Use Classes -> Processing Aids and Additives

Safer Chemical Classes -> Green circle - The chemical has been verified to be of low concern

Food additives

Flavouring Agent -> FLAVOURING_AGENTFood Additives -> ACIDITY_REGULATOR -> JECFA Functional Classes

Flavoring Agents -> JECFA Flavorings Index

Flavouring Agent -> FLAVOURING_AGENTFood Additives -> ACIDITY_REGULATOR -> JECFA Functional Classes

Applications · 7 items

DescriptionFumaric acid is an important kind of organic chemical raw materials as well as the intermediate of fine chemical products. Meanwhile, it is also an important kind of derivatives of maleic anhydride, being widely used in food, coatings, resins and plasticizers. In the food industry, fumaric acid, used as souring agent, can be applied to soft drinks, western-style wine, cold drinks, fruit juice concentrate, canned fruit, pickles and ice cream. As an acidic substance used as solid beverage gas production agent, it has excellent bubble durability with delicate product organization.Fumaric acid has been used as a food acidulant since 1946. As a food additive, it is used as an acidity regulator and can be denoted by the E number E297. Chemically it is an unsaturated dicarbonic acid and is part of the citric acid cycle. Fumaric acid is a common food additive included in many processed foods to keep them stable and to add tartness. The substance has a more sour flavor than citric acid, another common food additive. Fumaric acid occurs naturally in fumitory, bolete mushrooms, lichen and Iceland moss. As an additive, fumaric acid is produced synthetically, mainly from malic acid from apples. Fumaric acid as an additive is regulated under the Codex Alimentarius General Standard for Food Additives (GSFA), a collection of internationally recognized standards.The U.S. Food and Drug Administration considers it safe.

OccurrenceReported found in several plants, Fumaria offcinalis L , Boletus scaber Boll and lean raw fsh

UsesOccurs in many plants. Essential to vegetable and tissue respiration. Used as an antioxidant.Fumaric acid is used in food products as an acidifier with an acid type of taste that blends particularly well with caramellic or sugarsweetened products, baked products, etc.

UsesFumaric Acid is an acidulant that is a nonhygroscopic, strong acid of poor solubility. it has a solubility of 0.63 g in 100 ml of distilled water at 25°c. it dissolves slowly in cold water, but if mixed with dioctyl sodium sulfosuccinate its solubility improves. the solubility rate also increases with smaller particle size. a quantity of 0.317 kg of can replace 0.453 kg of citric acid. it is used in dry mixes such as desserts, pie fillings, and candy. it is used in dry bever- age mixes because it is storage stable, free flowing, and nonhygro- scopic. it functions as a synergistic antioxidant with bha and bht in oiland lard-base products. in gelatin desserts, it improves the flavor stability and increases shelf life and gel strength.

Uses1. Fumaric acid is used for the production of unsaturated polyester resin. This kind of resin is characterized by excellent resistance to chemical corrosion as well as heat resistance; the copolymer of fumaric acid and vinyl acetate is a kind of excellent adhesive. Its copolymer with styrene copolymer is the raw material for the manufacture of glass fiber. The plasticizer of the fumaric acid is non-toxic and can be applied to the vinyl acetate latex contact with food. This product is the intermediate of pharmaceutical and optical bleaching agents and other fine chemicals. Neutralization of fumaric acid with sodium carbonate can generate sodium fumarate ([17013-01-3]), and then replaced with ferrous sulfate to get iron fumarate, being the drug Fersamal used for the treatment of small red blood cell anemic. The product, as a food additive-sourness agent, used in soft drinks, fruit sugar, jelly, ice cream with most of them used in combination with sourness agent, citric acid. The monosidum salt made from the reaction between fumaric acid and sodium hydroxide can also used as sour seasoning, also used as the intermediate of synthetic resin and mordant. 2. Fumaric acid is included in many dairy-based products. These include dairy drinks such as chocolate milk, cocoa, eggnog, condensed milk and whey protein beverages. It also may be added to clotted cream, milk and cream powders and milk and cream analogues (substitutes). Fumaric acid is added to cheese products, including processed cheese and cheese substitutes. Dairy-based desserts, such as pudding, flavored yogurt, sherbet and sorbet may include fumaric acid as well. Dairy fat spreads and blended spreads can include fumaric acid, and so can preserved eggs and egg-based desserts such as custard. 3. Some processed and packaged foods have fumaric acid added to them to help stabilize them and enhance their flavor. For example, many processed meats, such as bacon and canned meats, have added fumaric acid. Frozen seafood, smoked meats and the edible casings around sausages might also have fumaric acid added to them. Fermented, canned, dried and processed fruits and vegetables can contain the food additive as well. Rice cakes and other precooked rice foods, dried or preserved eggs, mustard, vinegar, cider, wine and other alcoholic beverages are additional examples of foods that might contain fumaric acid.

Usesfumaric acid is used to add fragrance to products and to decrease product pH. It can also help keep the pH stable. It is generally used in cleansers. Fumaric acid is naturally occurring in plants, such as lichen and Iceland moss, and in animals. For example, the skin produces fumaric acid when exposed to light. It can also F be synthetically manufactured.

General DescriptionA colorless crystalline solid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit spread to the environment. Combustible, though may be difficult to ignite. Used to make paints and plastics, in food processing and preservation, and for other uses.

Preparation methods

PreparationBy the action of certain fungi (Rhizopus nigricans) on glucose; by oxidation of furfural with sodium chlorate in the pres- ence of vanadium pentoxide.

Upstream & downstream products

Upstream raw materials

Ammonium bromideMaleic acidMaleic anhydrideMineral oilSucroseMaltoseBenzeneSodium chloratewax liquidbuteneIsomerization catalystActivated carbonThiourea

Downstream products

FumaronitrileFumaryl chlorideFerrous fumarateBenzylfumarateL-Aspartic acidD-(-)-Tartaric AcidDL-Malic acidL-AlanineDisodium fumarateNEBRACETAM1-Boc-4-(4-methoxycarbonylphenyl)piperazineDiethyl fumarateDimethyl fumarate4-[4-(tert-Butoxycarbonyl)piperazino]benzoic acidSEMOTIADILBromosuccinic acid6-MethylcoumarinSuccinic acid
Additional notes · 3 items

DefinitionChEBI: A butenedioic acid in which the C2C double bond has E geometry. It is an intermediate metabolite in the citric acid cycle.

DefinitionEither of two isomers. Transbutenedioic acid (fumaric acid) is a crystalline compound found in certain plants. Cisbutenedioic acid (maleic acid) is used in the manufacture of synthetic resins. It can be converted into the trans isomer by heating at 120°C.

DefinitionButenedioic Acid: Either of two isomers with the formula HCOOHC:CHCOOH. Both compounds can be regarded as derivatives of ethene in which a hydrogenatom on each carbon has been replaced by a –COOH group. The compounds show cis–trans isomerism.The trans form is fumaric acid (r.d.1.64; sublimes at 165°C) and the cisform is maleic acid (r.d. 1.59; m.p.139–140°C). Both are colourless crystalline compounds used in making synthetic resins. The cis form is rather less stable than the trans form and converts to the trans form at120°C. Unlike the trans form it can eliminate water on heating to form acyclic anhydride containing a–CO.O.CO– group (maleic anhydride).Fumaric acid is an intermediate in the Krebs cycle.