O.O.[C:3]([O-:15])(=[O:14])[CH2:4][C:5]([CH2:10][C:11]([O-:13])=[O:12])([C:7]([O-:9])=[O:8])[OH:6].[Na+].[Na+].[Na+]>O>[C:3]([OH:15])(=[O:14])[CH2:4][C:5]([CH2:10][C:11]([OH:13])=[O:12])([C:7]([OH:9])=[O:8])[OH:6]1.45 grams of trisodium citrate dihydrate in 20 ml of distilled water was added to 18,900 grams of xanthan broth to give an equivalent citric acid concentration of 50 ppm; i.e., citric acid concentration of 50 ppm was prepared by adding 77 ppm trisodium citrate dihydrate. The citric treated xanthan sample in a 5 gallon polyethylene carbuoy was then vigorously agitated in a New Brunswick rotary shaker for 1 hour to insure proper mixing.
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