Inhibition of normal and waxy corn starch retrogradation by sodium borohydride.

Mengting Yu, Zihan Xu, Na Ji, Lei Dai, Liu Xiong, Qingjie Sun

International journal of biological macromolecules 2020 Jun 15

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After gelatinization, starch is prone to retrograde during storage, and it is a notorious challenge to inhibit starch retrogradation in papermaking, textile, and construction fields. This work aimed to develop a new method for inhibiting the retrogradation of normal corn starch (CS) and waxy corn starch (WCS) by sodium borohydride (NaBH4). Differential scanning calorimetry analysis suggested that addition of 2.0% (at dry starch basis, w/w) NaBH4 can completely inhibit WCS retrogradation. X-ray diffraction results showed that, as the NaBH4 concentration increased, the crystallinity of CS and WCS gradually decreased. After seven days of storage at 4 °C, the relative crystallinity of CS and WCS with 2.0% NaBH4 decreased by 62.22% and 100%, respectively. Low field nuclear magnetic resonance analysis showed that the incorporation of NaBH4 remarkably affected the change of relaxation time(T2). The T2 changes in the gelatinized CS and WCS with 2.0% NaBH4 were much lower than gelatinized CS and WCS without NaBH4. The addition of NaBH4 led to a reduction in the hydrogen bonding of CS and WCS, which was confirmed by Fourier transform infrared spectroscopy (FTIR). It was concluded that the addition of 2.0% NaBH4 can significantly inhibit the retrogradation of CS and WCS. Copyright © 2020. Published by Elsevier B.V.

Citation

Mengting Yu, Zihan Xu, Na Ji, Lei Dai, Liu Xiong, Qingjie Sun. Inhibition of normal and waxy corn starch retrogradation by sodium borohydride. International journal of biological macromolecules. 2020 Jun 15;153:341-348