Improving ordered arrangement of the short-chain amylose-lipid complex by narrowing molecular weight distribution of short-chain amylose.

To investigate effect of molecular weight distribution on formation of the short-chain amylose-lipid complex, debranched waxy rice starch (Unf) was fractionated into F1, F2 and F3, and the four fractions were used to complex with palmitic acid (C16:0). The peak molecular weight was in the order of F1 < Unf < F2 < F3, and the distribution was in the order of Unf> F3 > F1 > F2. XRD and DSC analysis indicated that the Unf-C16:0 complex was amorphous with the melting temperature (Tm) < 100 °C while the F3-C16:0 complex was highly ordered with Tm > 100 °C. Moreover, the F1-C16:0 complex was more ordered than the Unf-C16:0 complex, although F1 had lower molecular weight. These results suggested that improving homogeneity of short-chain amylose promoted ordered arrangement of the short-chain amylose-lipid complex. Moreover, the F3-C16:0 complex was the most resistant, which accorded with its highest crystallinity. Copyright © 2020 Elsevier Ltd. All rights reserved.

Citation

Shunjing Luo, Zhilu Zeng, Yaxin Mei, Kechou Huang, Jianyong Wu, Chengmei Liu, Xiuting Hu. Improving ordered arrangement of the short-chain amylose-lipid complex by narrowing molecular weight distribution of short-chain amylose. Carbohydrate polymers. 2020 Jul 15;240:116359

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PMID: 32475602

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