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Effects of different treatment methods on properties of potato starch-lauric acid complex and potato starch-based films

Author:
Wang, Rui, Liu, Pengfei, Cui, Bo, Kang, Xuemin, Yu, Bin
Source:
International journal of biological macromolecules 2019 v.124 pp. 34-40
ISSN:
0141-8130
Subject:
X-ray diffraction, composite films, composite materials, dimethyl sulfoxide, enthalpy, enzymatic hydrolysis, heat, light microscopy, melting, permeability, physicochemical properties, potato starch, potatoes, pullulanase, tensile strength, ultrasonic treatment, water vapor
Abstract:
The effects of different treatment methods on the physicochemical properties of potato starch (PS) and PS-based films were studied. The complexing indices of PS-lauric acid (LA) complexes followed the order: pullulanase debranching (PD) > ultrasound treatment (UT) > dimethyl sulfoxide heating (DSH) > Control. Light microscopy showed that PS-LA complexes exhibited irregularly shaped fragments. X-ray diffraction indicated that the diffraction intensity of the PD sample was stronger than that of the other samples. The melting enthalpies (△H) of the DSH, UT and PD samples were higher than that of the Control. PD sample had the lowest enzymatic-hydrolysis rate among all of the tested samples. PS-LA composite films showed higher tensile strength, lower elongation at break, and lower moisture permeability than native starch-based film, and the films prepared by PD method had the highest tensile strength and lowest water vapour permeability among all of the tested films.
Agid:
6226986