American Journal of Applied Sciences

Effect of Heat Moisture Treatment Using Different Solvents and Incubation Times on Resistant Starch Formation of Rice Flour

Anuchita Moongngarm, Piyatida Srijinda, Tatdao Paseephol, Supachai Samana and Nipapon Martphutorn

DOI : 10.3844/ajassp.2015.560.566

American Journal of Applied Sciences

Volume 12, Issue 8

Pages 560-566

Abstract

The thermal and pasting properties and Resistant Starch (RS) formation of high amylose rice flour were investigated at 121°C using different solvents and storage times. The samples treated with water and lactic acid 10 mmol/L with storage times 0, 24, 48 and 72 h had the highest degree of gelatinization, ranging from 98.64 to 99.86%. The samples treated with ethanol and lactic acid 10 mmol/L (in ethanol) had degrees of gelatinization varying between 58.25 and 59.91%. For the study on the thermal properties, the onset temperature (To), peak temperature (Tp), conclusion temperature (Tc) and enthalpy (∆H) of resistant starch preparation (retrograded rice flour) using water and lactic acid 10 mmol/L were not observed, but those of heated flour using ethanol and lactic acid in ethanol (10 mmol/L) were detected. The endothermic peaks of the amylose-lipid complex and resistant starch were also observed at higher temperatures from the Differential Scanning Calorimeter (DSC), with no effect of treatments on To, Tp and Tc. Rice flour heated in water and then stored for 24 h showed a favorable effect on formation of RS at 10.80%. Significant reductions were observed in all Rapid Visco Analyzer (RVA) viscosities of the retrograded rice flours.

Copyright

© 2015 Anuchita Moongngarm, Piyatida Srijinda, Tatdao Paseephol, Supachai Samana and Nipapon Martphutorn. 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.