Effect of the concentration of oxidized konjac glucomannan on gel properties of whey protein isolate gel

  • XIE Renxiang ,
  • QIN Xiaoli ,
  • XIE Yong ,
  • LUO Yuan ,
  • LIU Xiong
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  • 1(College of Food Science, Southwest University, Chongqing 400715, China)
    2(College of Material and Chemical Engineering, Tongren University, Tongren 554300, China)

Received date: 2023-04-25

  Revised date: 2023-07-07

  Online published: 2024-08-02

Abstract

Composite gels were prepared by mixing oxidized konjac glucomannan (OKGM) with whey protein isolate (WPI) to improve the properties of WPI gel and enhance its nutritional properties.The influence of OKGM addition amounts (1%, 1.5%, 2%, 2.5% and 3%) on the water holding capacity, texture, rheological properties, thermal stability and microstructure of WPI gel was investigated.The mechanism of composite gel formation was studied as well.The water holding capacity of the composite gels (65.59%-93.42%) was significantly higher than that of pure WPI gel (53.58%) in the presence of OKGM.The texture revealed that the highest hardness, springiness, gumminess and chewiness of composite gels were observed at 2% OKGM addition amount.The OKGM-WPI composite gels were weak gels and had lower dependence on high frequency and high temperature.The thermal stability of OKGM-WPI composite gels was higher than that of pure WPI gel when the addition amount of OKGM was not more than 1.5% through thermogravimetric analyzer analysis.Surface hydrophobicity and free sulfhydryl group analysis suggested that the incorporation of OKGM reduced the surface hydrophobicity and free sulfhydryl content.This was due to the formation of composite gels between WPI and OKGM through cross-linking and aggregation.Scanning electron microscopy revealed that the composite gels had a denser structure and the pores were more ordered.In general, the addition of OKGM could improve the properties and stability of WPI gel.

Cite this article

XIE Renxiang , QIN Xiaoli , XIE Yong , LUO Yuan , LIU Xiong . Effect of the concentration of oxidized konjac glucomannan on gel properties of whey protein isolate gel[J]. Food and Fermentation Industries, 2024 , 50(13) : 116 -122 . DOI: 10.13995/j.cnki.11-1802/ts.035923

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