Effect of NaOH Solution Pretreatment on the Microstructure of Potato Starch
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Graphical Abstract
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Abstract
The NaOH pretreatment is a popular method for the starch modification, but there are few studies on the microstructure change after pretreatment. In this experiment, potato starch was pretreated by using 2% NaOH aqueous solution under varied time and the obtained samples were marked STn. In order to investigate the influence of NaOH pretreatment on the microstructure of starch, the hydrothermal gelatinized starch (HST) was taken as the control sample. Results showed that, after 10 min of pretreatment, both the Maltese cross and B-type crystal structures of STn disappeared completely, while the granular structure of STn was destroyed and there were a lot of holes and gelation phenomena on the surface. It's clear that the molecular weight of STn decreased slightly, from 129.48 ×104 of original starch to 96.68 ×104.
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