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HCID 967作成日：2026年10月27日

オロチン酸

オロチン酸 · オロチン酸一水和物 · ビタミン B13(オロチン酸一水和物) · オロット酸 · オロト酸 · オロチン酸, 無水 · ウラシル-6-カルボン酸 · オロチン酸(1,3-15N2)

https://huagongshe.com/ja/chemical/967

オロチン酸 の分子構造式

識別子と物理属性

CAS No.65-86-1
分子式C5H4N2O4
平均分子量156.1 g/mol
単同位体質量156.01710661 g/mol
SMILESO=C(O)c1cc(=O)[nH]c(=O)[nH]1
InChIKeyPXQPEWDEAKTCGB-UHFFFAOYSA-N
PubChem CID967
ChEMBLCHEMBL1235017
ChEBICHEBI:16742
EC No.200-619-8
DTXSIDDTXSID0025814
現地名オロチン酸

化学・物理的性質

XLogP-1.4
極性表面積95.5
水素結合供与体数3
水素結合受容体数4
回転可能結合数1
重原子数11
形式電荷0
複雑度268
LogP（分配係数）-0.83log Kow = -0.83
LogS-1.93
Color/FormCrystals
溶解度less than 1 mg/mL at 68 °F (NTP, 1992)1820In water, 1,820 mg/L at 25 °C1.82 mg/mL at 18 °CDMSO : 32 mg/mL (205.00 mMNeed ultrasonic and warming)わずかに溶ける
DecompositionWhen heated to decomposition it emits toxic fumes of /nitrogen oxides/.
融点653 to 655 °F (NTP, 1992)345.5345-346 °C345.5 °C≥300 °C
Physical DescriptionOrotic acid appears as white crystals or crystalline powder. (NTP, 1992)Solid
Dissociation ConstantspKa1 = 2.07pKa2 = 9.45
Collision Cross Section181.87 Ų [M+Na]+ [CCS Type: DTMethod: stepped-field]125.2 Ų [M-H]- [CCS Type: DT138.85 Ų [M+H]+ [CCS Type: DT138 Ų [M+H]+121.7 Ų [M-H]-180.7 Ų [M+Na]+
沸点280.29°C (rough estimate)
密度1.6814 (rough estimate)
屈折率1.4800 (estimate)
貯蔵条件Sealed in dry,Room Temperature
外観・状態結晶性粉末
pKa（酸解離定数）pK1:1.8(+1)pK2:9.55(0) (25°C)
色白い
Merck13,6942
BRN383901
安定性安定。強力な酸化剤とは相容れない。
化粧品成分の機能スキンコンディショニング
InChI1S/C5H4N2O4/c8-3-1-2(4(9)10)6-5(11)7-3/h1H,(H,9,10)(H2,6,7,8,11)
InChIKeyPXQPEWDEAKTCGB-UHFFFAOYSA-N
SMILESOC(=O)C1=CC(=O)NC(=O)N1
LogP（分配係数）-0.830
CAS データベース65-86-1(CAS DataBase Reference)
NISTの化学物質情報Orotic acid(65-86-1)
EPAの化学物質情報Orotic acid (65-86-1)

化学的特性

white crystalline powder

安全性と法規制

GHS 分類This chemical does not meet GHS hazard criteria for 6.7% (4 of 60) of reports.WarningH302 (93.3%): Harmful if swallowed [Warning Acute toxicity, oral]H315 (88.3%): Causes skin irritation [Warning Skin corrosion/irritation]H319 (88.3%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]H335 (81.7%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposureRespiratory tract irritation]P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 60 reports by companies from 14 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Reported as not meeting GHS hazard criteria per 4 of 60 reports by companies.There are 13 notifications provided by 56 of 60 reports by companies with hazard statement code(s).Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.
規制情報Chemical: 4-Pyrimidinecarboxylic acid, 1,2,3,6-tetrahydro-2,6-dioxo-Directive (EC) No 46/2002Status: Active Update: 05-11-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/27509
その他の安全情報Evaluation - Chemicals that are unlikely to require further regulation to manage risks to environment
火災危険Flash point data for this chemical are not availablehowever, it is probably combustible. (NTP, 1992)
健康有害性SYMPTOMS: This compound may cause irritation.ACUTE/CHRONIC HAZARDS: This compound may cause irritation. When heated to decomposition it may emit toxic fumes of carbon monoxide, carbon dioxide and NOx. (NTP, 1992)
反応性グループAcids, CarboxylicAmides and Imides

用途

解説

オロチン酸ともいう．G. Biscaroら(1904年)によって牛乳から分離され，さらにP. Mitchellら(1948年)によって，パンかびや酵母の培養からも分離された．白色の結晶．融点345～346 ℃．λmax 205，280 nm(ε 10.9×103，7.52×103)．定量法にはバルビツル酸にかえ，p-(ジメチルアミノ)ベンズアルデヒドで比色する方法や，酵素でウリジル酸に変化させ，紫外部吸収の変化を測定する方法がある．オロト酸は，核酸成分であるピリミジン塩基の生合成中間物質の一つであり，オロト酸から生成するUDPやCDPは核酸の生合成材料となるだけでなく，糖質や脂質の代謝に補酵素となり，種々の代謝系に影響を与えているものと考えられる．オロト酸は乳汁中に特異的に多く，幼動物に対して発育効果を有する．A.F. Novakら(1948年)が，アルコール蒸留廃液中にネズミに対する成長促進因子の存在することを認め，B13 という名称を与えたが，B13 とオロト酸は同一物であることも知られている．

用途

核酸前駆ビタミンであり、皮膚および肝機能改善剤として湿布等に用いる。

使用

Orotic acid is an intermediate in de novo pyrimidine biosynthesis that may be used to study the specificity and kinetics of orotate phosphoribosyltransferase (OPRT) which catalyzes the reversible phosphoribosyl transfer from 5-phospho-α-d-ribose 1-diphosphate (PRPP) to orotic acid (OA), forming pyrophosphate and orotidine 5-monophosphate (OMP). It is used as a starting material for the potential commercial bioproduction of uridine 5-monophosphate (UMP) by microbes such as Corynebacterium ammoniagenes (ATCC 6872) or Saccharomyces cerevisiae. It may be used to study the AMPK/SREBP-1 dependent cell signaling pathway and transcription regulation mechanisms that induce hepatic lipogenesis.

一般的な説明

White crystals or crystalline powder.

Hydrocarbons, Aliphatic Unsaturated
Reactivity ProfileCarboxylic acids, such as OROTIC ACID, donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in waterthose with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in it to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) b
Air and Water ReactionsSlightly soluble in water.
Hazard Classes and CategoriesAcute Tox. 4 (93.3%)Skin Irrit. 2 (88.3%)Eye Irrit. 2A (88.3%)STOT SE 3 (81.7%)Acute toxicity (Oral) - Category 4
消火Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher. (NTP, 1992)
応急処置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 areatake 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 usedif 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)
非火災時の漏出対応SMALL SPILLS AND LEAKAGE: If you spill this chemical, you should dampen the solid spill material with water, then transfer the dampened material to a suitable container. Use absorbent paper dampened with water to pick up any remaining material. Seal your contaminated clothing and the absorbent paper in a vapor-tight plastic bag for eventual disposal. Wash all contaminated surfaces with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.STORAGE PRECAUTIONS: You should store this chemical at ambient temperatures, and keep it away from oxidizing materials. (NTP, 1992)
処分方法SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air qualitypotential migration in soil or watereffects on animal, aquatic, and plant lifeand conformance with environmental and public health regulations.
Personal Protective Equipment (PPE)RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)
相互作用In rats treated with phenobarbital for 3 days and simultaneously fed a semisynthetic diet containing 1.0% orotic acid, the extent of the increases in liver microsomal phosphatidylcholine, phosphatidylethanolamine, total RNA, total protein, and cytochrome P-450 were significantly greater than they were in rats treated identically with phenobarbital but without dietary orotic acid. This is attributed primarily to the stimulation of hepatic phosphatidylcholine synthesis by dietary orotic acid. In the absence of phenobarbital, orotic acid was shown to cause some increase in liver smooth endoplasmic reticulum components, but not cytochrome P-450. Orotic acid also decreased the activity of microsomal phosphatidylethanolamine N-methyltransferase, which may have contributed to the increase in the microsomal content of phosphatidylethanolamine. The hypothesis is advanced that phospholipid availability is a limiting factor in the hepatic response to phenobarbital. When more phospholipid is available to provide the structural framework for biogenesis of endoplasmic reticulum, all of the hepatic actions of phenobarbital, including induction of cytochrome P-450, are amplified.
健康影響Chronically high levels of orotic acid are associated with at least 4 inborn errors of metabolism including: Argininemia, Citrullinemia Type I, Purine nucleoside phosphorylase deficiency and Orotic Aciduria.
環境中動態TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 10(SRC), determined from a log Kow of -0.83(2) and a regression-derived equation(3), indicates that orotic acid is expected to have very high mobility in soil(SRC). Volatilization from moist soil surfaces is not an important environmental fate process because orotic acid will exist in ionized form, based on pKa values of 2.07 and 9.45(4), and ionized species do not volatilize(SRC). Volatilization from dry soil surfaces is not expected to occur based on an estimated vapor pressure of 1X10-8 mm Hg determined from a fragment constant method(5). Biodegradation data were not available(SRC, 2005).AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 10(SRC), determined from a log Kow of -0.83(2) and a regression derived equation(3), indicates that orotic acid is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is not an important environmental fate process because orotic acid will exist in ionized form based on pKa values of 2.07 and 9.45(4), and ionized species do not volatilize(SRC). According to a classification scheme(5), an estimated BCF of 3(SRC), from its log Kow(2) and a regression-derived equation(6), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Orotic acid may undergo direct photolysis in sunlit surface waters since it absorbs light greater than 290 nm(7), but the rate of this reaction is not known(SRC). Biodegradation data were not available(SRC, 2005).ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), orotic acid, which has an estimated vapor pressure of 1X10-8 mm Hg at 25 °C(2), is expected to exist in the particulate phase in the ambient atmosphere. Particulate-phase orotic acid may be removed from the air by wet and dry deposition(SRC). Orotic acid may undergo direct photolysis in the environment since it absorbs light greater than 290 nm(3)however, the rate of this reaction is unknown(SRC).
Soil Adsorption/MobilityThe Koc of orotic acid is estimated as 10(SRC), using a log Kow of -0.83(1) and a regression-derived equation(2). According to a classification scheme(2), this estimated Koc value suggests that orotic acid is expected to have high mobility in soil(SRC).
Natural Pollution SourcesOrotic acid occurs in cow's milk and has also been isolated from certain strains of molds (Neurospora).
Artificial Pollution SourcesOrotic acid's production and use in biochemical research, particularly in the synthesis of nucleic acids(1) and its proposed use as a feed supplement for calves(2), may result in its release to the environment through various waste streams(SRC).
Carcinogen ClassificationNo indication of carcinogenicity to humans (not listed by IARC).
Environmental BioconcentrationAn estimated BCF of 3 was calculated for orotic acid(SRC), using a log Kow of -0.83(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).
Volatilization from Water/SoilpKa values of 2.07 and 9.45(1), indicate that orotic acid will exist in various ionized forms at pH range 5-9 in water and moist soil surfaces. Volatilization from water and moist soil surfaces will not be an important environmental fate process since ionized species do not volatilize(SRC). Volatilization from dry soil surfaces is not expected to occur based on an estimated vapor pressure of 1X10-8 mm Hg determined from a fragment constant method(2).
Non-Human Toxicity Excerpts/LABORATORY ANIMALS: Chronic Exposure or Carcinogenicity/ Male Fischer 344 rats initiated with 1,2-dimethylhydrazine 2HCl (100 mg/kg) given 18 hr after partial hepatectomy and exposed to a diet containing 1% orotic acid for 13 months developed a 100% incidence of hepatocellular carcinoma. The creation of nucleotide pool imbalances by dietary orotic acid, for e.g., an increase in uridine nucleotides and a decrease in adenine nucleotides, was considered as a possible mechanism for the promotional effect of orotic acid on liver carcinogenesis. The significance of this hypothesis is that altered nucleotide pools affect both genomic as well as membrane organization. Consistent with this hypothesis is our finding that feeding rats with a diet containing 1% orotic acid for 10 weeks resulted in a liver DNA damage as monitored by its slower sedimentation in alkaline sucrose gradients compared to the corresponding controls. To assess the general applicability of this hypothesis, nucleotide pool imbalances were created by using methods other than feeding orotic acid and their effect on the incidence of gamma-glutamyltransferase positive foci in carcinogen initiated rats was determined. The results obtained indicated that rats initiated with 1,2-dimethylhydrazine.2HCl (100 mg/kg) given 18 hr after partial hepatectomy and exposed to diet deficient in arginine, a regimen that causes an increased synthesis and excretion of orotic acid, or were fed diets containing 1% thymidine or 1% thymine developed greater number of gamma-glutamyltransferase positive foci compared to the corresponding controls fed the basal diets./LABORATORY ANIMALS: Subchronic or Prechronic Exposure/ ... The present study was undertaken to evaluate hepatic cytochrome P-450 (CYP) function in a rat model of microvesicular steatosis produced by the intake of diets containing 1% orotic acid (OA) that were administered for 5, 10, or 21 days. Hepatic triglyceride levels were increased to 3-fold of control after 5 days and were elevated further at 10 and 21 days. Cholesterol and phospholipid contents were increased after 10 and 21 days but not by 5 days of feeding. Microsomal androst-4-ene-3,17-dione hydroxylation activities mediated by CYP2C11 (16alpha-hydroxylation) and CYP3A2 (6beta-hydroxylation) were decreased in liver from OA-fed rats for only 5 days, whereas CYP2A1/2-mediated steroid 7alpha-hydroxylation was decreased after 10 daysthese observations were complemented by immunoblot analysis that demonstrated the impaired expression of the corresponding CYP proteins. CYP2C11 mRNA, the major CYP in male rat liver, was down-regulated in steatotic liver to 52 +/- 4% of control. Thus, microvesicular steatosis induced by short-term intake of OA-containing diets is histologically similar to that produced by hepatotoxic drugs and produces the rapid down-regulation of constitutive CYPs in rat liver./LABORATORY ANIMALS: Subchronic or Prechronic Exposure/ To evaluate orotic acid (OA) as a possible etiologic factor in cats with idiopathic hepatic lipidosis (HL). 20 clinically normal adult female cats. Cats were fed a control diet or a diet containing less protein. On day 1 of the control period, blood, urine, and liver biopsy specimens were obtained. Each cat was given an oral dose of water daily. On days 8, 15, and 22, blood and urine specimens were collected as on day 1. On day 29, liver, blood, and urine samples were obtained as on day 1. After a resting period of 30 to 60 days, cats were treated with orotic acid. Serum biochemical analyses, urinary OA-to-creatinine ratios, and liver biopsy specimens were evaluated. Cats were given OA orally (suspension or capsules) for 29 days. Sample collection and data obtained were identical to those described for the control period. Urinary OA-to-creatinine ratios were significantly higher in all treated cats, but ratios were significantly higher in those receiving OA in capsules than in those receiving OA in suspension. Diet or treatment did not alter hepatic biochemical or histologic variables significantly. However, 7 cats given the highest dose of OA in capsules developed azotemia, urolithiasis, and renal changes. Most concentrations of OA used in this study did not induce HL in cats during a 29-day period, but the highest dosage used did result in renal disease./LABORATORY ANIMALS: Chronic Exposure or Carcinogenicity/ The effect of dietary orotic acid (OA) in liver-pancreas carcinogenesis induced in female Syrian hamsters by N-Nitroso(2-hydroxypropyl) (2-oxopropyl)amine (HPOP) was evaluated. All animals infused with the carcinogen received the same doses. Results of the control group which received no OA or carcinogen were compared with the results of: (a) hamsters treated with HPOP and fed a regular 20% protein synthetic diet (group 1)(b) hamsters fed the OA diet for a brief time period during initiation with the carcinogen (group 2)and (c) hamsters in which OA was administered after carcinogen infusion for life (group 3). All animals of the control group were normal at autopsy, while those in group 1 (HPOP alone) revealed the spectrum of lesions accepted as classical in the multistep hyperplasia-dysplasia-carcinoma in situ (CIS) sequence of carcinogenesis. Results of group 2, in light of group 1, revealed an increased incidence of the following lesions in the common pancreatic duct: dilatation, 2.5 timesflat and papillary hyperplasia, 2 timesand dysplasia (atypical hyperplasia), 12 times. No significant increase of CIS and invasive cancer in the body and tail of the pancreas was observedin addition, the incidence, nature, and location of pancreatic adenocarcinomas were not affected. Yet, the effect of OA administered after carcinogen infusion (group 3) when compared to group 1 seemed to enhance a further increase in the incidence of practically all lesions throughout the pancreas. An obvious overall step-up incidence along the multistep hyperplasia-dysplasia-CIS-invasive cancer process in the pancreas was observed. The increase in incidence of flat, papillary, and atypia of the epithelium of the common pancreatic duct in group 3 was mild compared to that found in the same duct of group 2, but the increase in incidence of these same three lesions when found in the main ducts was marked: flat hyperplasia, 3-foldFor more Non-Human Toxicity Excerpts (Complete) data for OROTIC ACID (15 total), please visit the HSDB record page.
Environmental Abiotic DegradationOrotic acid may undergo direct photolysis in the environment since it absorbs light greater than 290 nm(1)however, the rate of photolysis is unknown(SRC). pKa values of 2.07 and 9.45(2), indicate that orotic acid will exist in ionized form in water(SRC).
Probable Routes of Human ExposureOccupational exposure to orotic acid may occur through inhalation and dermal contact with this compound at workplaces where orotic acid is produced or used. (SRC)
F10-21
水環境危害等級（WGK）3
TSCA 収載状態TSCA listed
RTECS 番号RM3180000
毒性pic-esc 1 g/L ZAPOAK12,583,72
税関コード29335990
危険文句（R）22-36/37/38
危険表示Xn,Xi
hazard_noteHarmful
安全措置（S）26-36/37/39-22-37/39
危険等級Acute Tox. 4 OralEye Irrit. 2Skin Irrit. 2STOT SE 3
貯蔵分類11 - Combustible Solids
有害物質データ65-86-1(Hazardous Substances Data)