Effects of Dry Heat Treatment on Physicochemical and Structural Characteristics of Loquat Kernel Starch
The effects of dry heat treatment on the physicochemical and structure of loquat kernel starch were studied.The values of peak viscosity,pasting temperature and final viscosity of loquat core starch after dry heat treatment showed that dry heat treatment has obvious influence on loquat core starch,showing that viscosity values first increase and then decrease,while the pasting temperature rises.The viscosity peaks at 130 ℃ during dry heat treatment.The thermal characteristics were analyzed,and the results showed that dry heat treatment would cause the disintegration of loquat kernel starch crystals and the unwinding of the double helix structure,changing the initial and peak temperature of starch,and reducing the enthalpy of starch.The crystallization test were carried out,and the results showed that dry heat treatment could change the size of loquat kernel starch grains and the crystallinity of starch,and could make starch granules generate new grains or reduce the number of grains.The crystallinity was higher at 130 ℃,and each all indicators were good.The results of infrared spectroscopy and morphology studies showed that dry heat treatment wouldn't change the types of starch groups,but affects their number and intensity,and the phenomenon was easy to observe at around 130℃.
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