Prepared at the 26th JECFA (1982), published in FNP 25 (1982)n may be based on the principles of the method described in Volume 4, “Instrumental Methods.”
TESTS
PURITY TESTS
Saponification value Transfer about 1 g of the sample, accurately weighed, into a 250-ml Erlenmeyer flask, and add 25 ml of ethylene glycol, 35 ml of N ethanolic potassium hydroxide, and a few glass beads. Reflux for one h, using a water condenser, then rinse the condenser with water and cool. Add 1 ml of phenolphthalein TS and titrate with N hydrochloric acid. Perform a blankdetermination but do not reflux. The difference between the volumes, in ml of N hydrochloric acid consumed in the actual test and in the blank titration, multiplied by and divided by the weight, in g, of the sample taken, is the saponification value.
Total citric acid Reagents - Brominating solution: Dissolve g of potassium bromide, of potassium bromate and 12 g of sodium meta
