A self-matching, ultra-fast film forming and washable removal bio-crosslinked hydrogel films for perishable fruits.

Carbohydrate Polymers
Yongfu DengBaofeng Lin

Abstract

Spoilage of food has aggravated the issue of food shortage worldwide. Here, we report a strategy for ultrafast hydrogel film forming within 10 s on fruit surfaces with good self-matching, washable removal and preservative property. This carboxymethyl chitosan (CMCS)/tannic acid (TA) hydrogel film (CTHF) is fabricated by bio-material of CMCS and TA via in-situ rapidly crosslinking with high-density hydrogen bonds. Simply blending TA and CMCS solution at room temperature can form CTHF with different roughness (Ra: ranges from 123 to 1.55 nm) on different fruit surfaces, so as to perfectly match the hydrogel protective layer of pericarp. The CTHF slows down fruit decay by its outstanding antioxidant and antibacterial activity. It is soluble and easily removed (within 3-5 min) by washing without environmental pollution and food safety issues. As natural polymer, CTHF shows high promise as sustainable substitutes for conventional plastics packing because of its non-toxic, edible, biodegradable, and environmentally friendly.

References

Sep 15, 1983·The Biochemical Journal·H A KrebsF Bedoya
Oct 6, 1998·Critical Reviews in Food Science and Nutrition·K T ChungY Lin
Sep 13, 2013·Angewandte Chemie·Tadas S SileikaPhillip B Messersmith
Nov 15, 2017·Royal Society Open Science·Supaporn BousonMontree Sawangphruk
May 19, 2018·Carbohydrate Polymers·Ahmed M Youssef, Samah M El-Sayed
Aug 26, 2018·Carbohydrate Polymers·Zhengguo WuXiaoying Wang
Nov 21, 2019·Journal of Agricultural and Food Chemistry·Jie YangQingjie Sun
May 5, 2020·Advanced Materials·Seohui JungPulickel M Ajayan

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