21.131—Sucrose octaacetate.
(a)
Sucrose octaacetate is an organic acetylation product occurring as a white or cream-colored powder having an intensely bitter taste.
(b) Free acid (as acetic acid).
Maximum percentage 0.15 by weight when determined by the following procedure: Dissolve 1.0 gram of sample in 50 ml of neutralized ethyl alcohol (or S.D.A. No. 3-A, No. 3-C, or No. 30) and titrate with 0.1 N sodium hydroxide using phenolphthalein indicator.
Percent acid as acetic acid=ml NaOH used×0.6/ weight of sample
(e) Purity.
Sucrose octaacetate 98 percent minimum by weight when determined by the following procedure: Transfer a weighed 1.50 grams sample to a 500 ml Erlenmeyer flask containing 100 ml of neutral ethyl alcohol (or S.D.A. No. 3-A, No. 3-C, or No. 30) and exactly 50.0 ml of 0.5 N sodium hydroxide. Reflux for 1 hour on a steam bath, cool and titrate the excess sodium hydroxide with 0.5 N sulfuric acid using phenolphthalein indicator.
Percent sucrose octaacetate=(ml NaOH−ml H2SO4)×4.2412/weight of sample