Glycerol-plasticized
high-amylose corn starch/konjac glucomannan
(HCS/KGM) composite films incorporated with various concentrations
of β-cyclodextrin (β-CD) were prepared and investigated
for structural, mechanical, and physical properties. The results of
X-ray diffraction, attenuated total reflectance Fourier transform
infrared spectroscopy, thermogravimetric analyses, and scanning electron
microscopy indicated that β-CD excluded from the polymer chains
and aggregated to form crystals during film formation, which drove
HCS to interact with KGM more compactly. The thickness and transparency
of the films increased after β-CD was incorporated. More associations
of HCS/KGM enhanced the mechanical properties and reduced the moisture
content of the films. The water vapor permeability of the HCS/KGM
composite film was also improved significantly with the incorporation
of β-CD. The enhanced association between biopolymers in the
presence of β-CD will advance the development of a degradable
active composite packaging film.
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