Physico-chemical properties and digestibility of native and citrate starches change in different ways by synchrotron radiation

The physico-chemical properties and digestibility of native and citrate cassava starches changed as a result of synchrotron radiation treatment. In this study, the native and citrate starch samples were exposed to radiation doses of 0.1, 0.4, 0.8 and 3.9 kGy. The granular morphology revealed that all samples were rupture and damage after radiation. As increasing radiation doses, the relative crystallinity as determined by WAXS and the ratio of 1047/1015 cm(-1) from FTIR result decreased while the degree of degradation and solubility increased for all samples. The swelling power of radiated native starches decreased with higher radiation doses indicating that the cross-linking of starch was induced by synchrotron radiation which was related to an increase in the resistant starch content. On the contrary, for radiated citrate samples, the FTIR peak at 1724 cm(-1) was observed. The ratio of 1724/2900 cm(-1) and total esterified citric acid did not change. The swelling and degree of diesterification were reduced while the degree of mono-esterification increased with higher doses. It implied that the crosslinking by ester bonds was broken into mono-ester bonds. This work demonstrated that synchrotron radiation changed the physical and chemical properties of native and citrate starches in different ways.

Automated summary

This study found that the physico-chemical properties of native and citrate starches were altered by synchrotron radiation treatment. After radiation, all samples showed rupture and damage. With increasing radiation doses, the relative crystallinity and certain peak ratios decreased, while degradation and solubility increased. Synchrotron radiation induced the cross-linking of starch, leading to an increase in resistant starch content. For citrate samples, the cross-linking by ester bonds was broken into mono-ester bonds.