Food and Fermentation Industries >

2024 , Vol. 50 >Issue 1: 89 - 97

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.034032

Effect of synergistic crosslinking agent based on blending and layer-by-layer assembly method on properties of agar/sodium alginate composite film

  • WANG Pai ,
  • YANG Shaoling ,
  • QI Bo ,
  • YANG Xianqing ,
  • LI Chunsheng ,
  • WANG Di ,
  • ZHAO Yongqiang ,
  • LI Laihao ,
  • HU Xiao ,
  • CHEN Shengjun
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  • 1(College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China)
    2(South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences/Key Laboratory of Aquatic Product Processing, Guangzhou 510300, China)
    3(Dalian Polytechnic University/Collaborative Innovation Center of Seafood Deep Processing, Dalian 116034, China)

Received date: 2022-10-19

  Revised date: 2023-01-03

  Online published: 2024-01-31

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Abstract

Agar/sodium alginate blend films and bilayer films were prepared by direct mixing and layer-by-layer assembly, and the cross-linking agents involving citric acid and ferulic acid were introduced. By investigating the mechanical strength, water resistance, thermal stability, Fourier transform infrared spectrometer (FT-IR), and microstructure of the composite films, the effects of different film-making methods combined with cross-linking agents on the properties of the composite films were explored. Results showed that compared with the blend films, the bilayer films showed better mechanical properties and water resistance. After adding crosslinking agents, the water vapor permeability of the films decreased significantly (P<0.05) and the tensile strength, thermal stability, and opacity increased. Among them, citric acid crosslinked bilayer film had the best comprehensive properties, namely, tensile strength of 51.57 MPa, elongation at break of 26.02%, water solubility of 24.42%, and swelling rate of 101.67%. FT-IR analysis showed that citric acid was covalently crosslinked by esterification with seaweed polysaccharide to form CO, while ferulic acid was noncovalently crosslinked by hydrogen bonding with the film-forming substrate. SEM analysis showed that agar and sodium alginate had good compatibility, and the surface of each film was flat and smooth. After adding a crosslinking agent, the cross-sections of the films were smoother and the structure of the films was more compact. Therefore, the combination of layer-by-layer assembly and crosslinking agents can prepare a composite membrane with better comprehensive properties.

Key words： agar; sodium alginate; layer-by-layer assembly; crosslinking agent

Cite this article

WANG Pai , YANG Shaoling , QI Bo , YANG Xianqing , LI Chunsheng , WANG Di , ZHAO Yongqiang , LI Laihao , HU Xiao , CHEN Shengjun . Effect of synergistic crosslinking agent based on blending and layer-by-layer assembly method on properties of agar/sodium alginate composite film[J]. Food and Fermentation Industries, 2024 , 50(1) : 89 -97 . DOI: 10.13995/j.cnki.11-1802/ts.034032

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