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Formation and structure evolution of starch nanoplatelets by deep eutectic solvent of choline chloride/oxalic acid dihydrate treatment

In this study, we report a top-down approach to fabricate starch nanoplatelets (SNPs) based on a deep eutectic solvent (DES) comprised of choline chloride and oxalic acid dihydrate. When subjecting waxy maize starch (WMS) to 2 h of DES treatment, the SNPs of oxalate half-ester were successfully fabr...

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Published in:Carbohydrate polymers 2022-04, Vol.282, p.119105-119105, Article 119105
Main Authors: Xiao, Qian, Dai, Miaoqi, Zhou, Hui, Huang, Min, Lim, Loong-Tak, Zeng, Chaoxi
Format: Article
Language:English
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Summary:In this study, we report a top-down approach to fabricate starch nanoplatelets (SNPs) based on a deep eutectic solvent (DES) comprised of choline chloride and oxalic acid dihydrate. When subjecting waxy maize starch (WMS) to 2 h of DES treatment, the SNPs of oxalate half-ester were successfully fabricated. The formation mechanism of SNPs was studied by monitoring the changes in nanoplatelet morphology, amylopectin chain distribution, long-range crystallinity, and semi-crystalline lamellar structure of the DES-treated WMS at various treatment times. During the DES treatment, relative crystallinity values of WMS gradually decreased from 28.7 to 25.2%. With increasing DES treatment time from 0 to 1.5 h, the thickness of crystalline lamellae decreased from 6.38 to 5.57 nm, whereas the opposite trend was observed for the thickness of amorphous lamellae. The method developed in this work offers a green and efficient route to prepare non-toxic starch nanomaterials. [Display omitted]
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2022.119105