Comparison Sodium Hypochlorite Oxidation Starch in Different Acid Base Conditions

摘要

In order to study two different acid base environment (constant pH, non-constant pH) influent on carboxyl content and structure of oxidation starch. The carboxyl content of two kinds of oxidation starch was tasted by starch paste titration method, X ray diffraction and infrared spectrum had been compared. The experimental result was shown that the carboxyl content and crystallinity of starch oxidized by constant pH was 0.599% and 30.99%, respectively. The carboxyl content and crystallinity of starch oxidized by non-constant pH was 0.702% and 28.75%, respectively. This is provided that non-constant pH was more advantageous to the carboxyl generation of oxidized starch. Sodium hypochlorite can break crystal structure of starch. Non constant pH acid-base environment can effectively break the crystalline structure of starch.