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Effects of low polyhydroxyalkanoate content on the properties of films based on modified starch acquired by extrusion blowing

Sun, Shenglin, Liu, Pengfei, Ji, Na, Hou, Hanxue, Dong, Haizhou
Food hydrocolloids 2017 v.72 pp. 81-89
Fourier transform infrared spectroscopy, X-ray diffraction, crystal structure, extrusion, hydrocolloids, hydrogen bonding, modified starch, permeability, phosphates, polyhydroxyalkanoates, scanning electron microscopy, tensile strength, transmittance, water vapor
The effect of low polyhydroxyalkanoate (PHA) content on hydroxypropyl distarch phosphate (HPDSP)/PHA films produced by extrusion blowing was studied. Scanning electron microscopy (SEM) micrographs of the films containing 12% PHA showed a continuous and homogeneous structure. X-ray diffraction (XRD) indicated that the relative crystallinity of the films gradually increased with the increase of PHA content. The films containing 12% PHA exhibited the highest light transmittance, and tensile strength (TS, 3.75 MPa). The water vapor permeability of the starch-based films greatly decreased (p < 0.05) as the PHA content increased from 0% to 36%. Furthermore, Fourier transform infrared (FTIR) spectroscopy revealed that new hydrogen bonds were formed by the addition of PHA. Results suggested that the formulation with 12% PHA was the most suitable for the preparation of starch-based films with enhanced properties.