In vitro Evaluation of the Digestive Tolerance of Water-Soluble Sodium β-(1→4)-Polyglucuronate

Abstract

A water-soluble sodium β-(1→4)-polyglucuronate (or sodium cellouronate, Na-CUA) was prepared from regenerated cellulose by catalytic oxidation in water at pH ~10. Digestive behavior of Na-CUA was evaluated in vitro using three enzymes, α-amylase, pepsin, and pancreatin in water at 80 or 40 °C for 30 or 60 min. The results showed that 98.95 % Na-CUA remained undigested, indicating that Na-CUA is categorized as water-soluble dietary fibers.