Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 11, Pages 2631-2639Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00353
Keywords
Lowly toxic cross-linker; Starch; Oxidized sucrose; Biobased aldehyde; Flexible film
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Funding
- Nebraska Corn Board, USDA - National Institute of Food and Agriculture (Hatch Act, Multistate Research Project) [S-1054 (NEB37-037)]
- Agricultural Research Division at the University of Nebraska-Lincoln
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In this research, oxidized sucrose, a novel aldehyde-based green cross-linker, endowed starch films with substantial improvement in both tensile strength and elongation, whereas many other cross-linkers did not. Starch films are usually weak, brittle, and highly moisture sensitive, and thus have restricted industrial applications. Cross-linking is one of the most common methods to tackle these problems. However, most of the available cross-linkers are either toxic, expensive, or with low cross-linking efficiencies. Oxidized sucrose is a green cross-linker with multiple aldehyde groups per molecule to cross-link starch molecules via forming hemiacetals/acetals. The starch films cross-linked with oxidized sucrose had tensile strength and breaking elongation of 23 MPa and 60%, respectively, exceeding the cross-linking results of many other cross-linkers. Oxidized sucrose cross-linking also substantially increased the stability of starch films in both water and formic acid. With activation energy as low as 33.22 kJ mol(-1), the cross-linking, a pseudo-first-order reaction, could occur readily. Mild cross-linking using oxidized sucrose might provide an alternative to promote industrialization of starch-based products.
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