American Journal of Applied Sciences

Amphoteric Starch in Simultaneous Process Preparation with Box-Behnken Design for Optimal Conditions

Sopa Cansee, Juntanee Uriyapongson, Commueng Watyotha, Thavachai Thivavarnvongs and Jatuphong Varith

DOI : 10.3844/ajassp.2008.1535.1542

American Journal of Applied Sciences

Volume 5, Issue 11

Pages 1535-1542

Abstract

Cassava starch was chemically modified to produce an amphoteric starch. The amphoteric starch was prepared in a simultaneous process which was evaluated in relation to four factors: temperature (45-55 °C), 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC, 4-12%) and sodium tripolyphosphate (STP, 2-8%) concentrations, and reaction time (2-6 h). The extent of amphoteric starch produced was determined by the degree of substitution (DS) of the nitrogen content and percentage of phosphorus content. In addition, a quantitative response of yield and whiteness as well as pasting characteristics were tested. Response surface analysis showed that the DS (0.01-0.05) increased with increasing temperature, CHPTAC and reaction time. The phosphorus content (0.09-0.34%) followed a parabolic shape with all of the factors. Consequently, the response surface methodology appears to be a powerful technique to determine the optimal conditions for the production of amphoteric starches.

Copyright

© 2008 Sopa Cansee, Juntanee Uriyapongson, Commueng Watyotha, Thavachai Thivavarnvongs and Jatuphong Varith. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.