Controllable hydrophilicity-hydrophobicity and related properties of konjac glucomannan and ethyl cellulose composite films

Kao Wu, Qian Zhu, Hong Qian, Man Xiao, Harold Corke, Katsuyoshi Nishinari, Fatang Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

An improved preparation method of konjac glucomannan-ethyl cellulose (KGM-EC) composite film was adopted to allow hydrophobic contents (EC) varying from 0% to 85.7% in the films, and may be explained by emulsification effect of both KGM and EC. Scanning electron microscopy images supported that all blend films had homogenous microstructures without phase separation. Moisture adsorption, water contact angle, swelling test, water vapor transmission, and mechanical tests were performed to evaluate the hydrophilicity-hydrophobicity and related properties of the films. Results indicated that EC addition significantly decreased the values of moisture adsorption, swelling, water vapor transmission, and mechanical strength of the films, and increased the contact angle. For composite films, linear relationships (most R2 > 0.9) were found between ingredient proportion and results of moisture isotherms, and water contact angle, indicating controllable hydrophilicity-hydrophobicity. Ingredient proportion was also found to correlate linearly with film tensile strength (TS) and elongation ratio (R2 = 0.7502 and 0.8974, respectively), and after immersion in water, TS still correlated linearly with ingredient ratio (R2 = 0.9767). These results support the hydrophilicity-hydrophobicity and related properties of KGM-EC film could be controllable through ingredient proportion, and this also offers the potential of the film to have unique property changes (e.g. linear) in response to different relative humidity or aw equilibrium condition under certain ingredient proportion.

Original languageEnglish
Pages (from-to)301-309
Number of pages9
JournalFood Hydrocolloids
Volume79
DOIs
StatePublished - Jun 2018
Externally publishedYes

Keywords

  • Composite film
  • Ethyl cellulose
  • Hydrophilicity-hydrophobicity control
  • Konjac glucomannan

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