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Carbohydrate Polymers 2020-Sep

Preparation and characterization of Konjac glucomannan and pullulan composite films for strawberry preservation

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Yansu Yan
Songqi Duan
Huilan Zhang
Yuntao Liu
Cheng Li
Bin Hu
Aiping Liu
Dingtao Wu
Jialiang He
Wenjuan Wu

Nøgleord

Abstrakt

The present study aims to develop the new composite films by blending Konjac glucomannan (KGM) and pullulan with different ratios and concentrations. The structural, physical, barrier properties and morphology of the films were investigated and the practical use on strawberry preservation at 4 ± 1 °C, 85 %±5% relative humidity (RH) and 25 ± 1 °C, 55 %±5% RH was evaluated. Fourier transform infrared and scanning electron microscopy indicated the well-dispersion of film matrix was due to the good compatibility of the components. The mechanical and barrier properties of blend films were markedly enhanced although the light transmittance of which were decreased slightly. It was a further proof that 1% (w/v) KGM/pullulan (with the mass ratio of 2:1) blend film could decrease the weight loss significantly and maintain the titratable acidity, soluble solids and skin color on the strawberry preservation, thus improving the qualities of strawberries during storage time and offering a potential alternative to synthetic materials.

Keywords: Composite films; Film properties; Food packaging; Konjac glucomannan; Pullulan; Strawberry shelf-life.

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