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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.