Hydroxypropyl Starch

Pregelatinized starch (CAS 113894-92-1) occurs as a moderately coarse to fine, white to off-white colored powder. It is odorless and has a slight characteristic taste. Examination of fully pregelatinized starch as a slurry in cold water, under a polarizing microscope, reveals no significant ungelatinized granules, i.e. no‘maltese crosses’characteristic of the starch birefringence pattern. Examination of samples suspended in glycerin shows characteristic forms depending upon the method of drying used during manufacture: either irregular chunks from drum drying or thin plates. Partially pregelatinized starch (e.g.Starch 1500G and Sepistab ST200) show retention of birefringence patterns typical of unmodified starch granules.