Physicochemical and functional properties of Chinese giant salamander skingelatin-tea polyphenol composite film liquids

  • JIN Wengang ,
  • GUO Siqi ,
  • XIAO Miao
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  • 1 (School of Biological Scienc and Engineering, Shaanxi University of Technology, Hanzhong 723001, China)
    2 (Institutes of Chinese Giant Salamander, Shaanxi University of Technology, Hanzhong 723001, China)

Received date: 2019-05-14

  Online published: 2019-10-24

Abstract

The effects of different mass fractions of tea polyphenols on the properties of the composite film liquid were studied by using Chinese giant salamander skin gelatin and tea polyphenols as raw materials. The results showed that the addition of tea polyphenols resulted in the decrease of L* value and pH value of the composite film liquids, but the a* value and b* value increased. Compared with the control group, the gel strength of the composite film containing 0.4% tea polyphenols increased significantly (P<0.05), but when the tea polyphenol content was 0.8% or above, the gel strength of the composite film liquids decreased (P<0.05). The shear rheological analysis showed that the apparent viscosity and the ultimate shear stress of the composite film increased first and then decreased compared with the control group. Infrared spectrum analysis showed that the absorption peaks of liquid amide A, I, II and III bands of giant salamander skin gelatin composite films were shifted to different degrees by introducing different mass fractions of tea polyphenol. In addition, the DPPH radical scavenging capacity and reducing power of composite film groups were significantly improved after adding tea polyphenols(P<0.05). In general, the gelatin composite film liqui containing 0.4% tea polyphenols showed good physicochemical and functional properties, and it deserves further studies for food preservatives and edible films in the future.

Cite this article

JIN Wengang , GUO Siqi , XIAO Miao . Physicochemical and functional properties of Chinese giant salamander skingelatin-tea polyphenol composite film liquids[J]. Food and Fermentation Industries, 2019 , 45(17) : 85 -90 . DOI: 10.13995/j.cnki.11-1802/ts.021090

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