ENRICHMENT AND RECOVERY OF RESISTANT MALTODEXTRIN FROM RICE STARCH BY ETHANOL PRECIPITATION AND ION - EXCHANGE CHROMATOGRAPHY

Abstract

Two processes are introduced as approaches for enriching and recovering resistant maltodextrin from rice starch based pyrodextrin hydrolyzate: Ethanol precipitation and ion-exchange chromatography. For ethanol precipitation technology, the parameters include: Pyrodextrin solution concentration of 40%, rate of ethanol volume versus dry mass of pyrodextrin is 10 times (v/w), and time for separation precipitation of 5 hours. For the ion-exchange chomatography technology, it requires the strong acid cation exchange resins in Ca⁺⁺ form with separation conditions including: Space velocity SV 0.25 - 0.50, initial pyrodextrin solution concentration of 30-40^oBx. The product recovery by ethanol precipitation provides a high separation yield, while the ion-exchange column yields less at higher purity. Both technologies can be considered applicable in practice.