Food and Fermentation Industries >

2021 , Vol. 47 >Issue 8: 34 - 39

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.025644

The effect of different drying methods on properties of gelatin

  • ZHU Juncheng ,
  • FENG Xin ,
  • LI Lusi ,
  • MA Liang ,
  • DAI Hongjie ,
  • FU Yu ,
  • HUANG Shaolin ,
  • ZHANG Yuhao
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  • 1(College of Food Science, Southwest University, Chongqing 400715, China)
    2(National Demonstration Center for Experimental Food Science and Technology Education (Southwest University), Chongqing 400715, China)

Online published: 2021-05-20

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Abstract

The effects of different drying methods (hot air drying, vacuum freeze-drying and spray drying) on the properties of gelatin were studied systematically, including the yield, color, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), gel strength, the water holding capacity of gel, hydrophobicity and Fourier transform infrared spectroscopy (FTIR). The results showed that the yield of spray-dried gelatin was significantly lower (P<0.05) due to wall sticking and the dissipation in vortex separation. Spray drying and vacuum freeze drying could reduce the formation of bad color, reduce the oxidation and degradation of gelatin during drying the process, retain more polymer subunits, resulting in the increased of gel strength and water holding capacity of gel. Furthermore, the spray drying gelatin showed the highest hydrophobicity due to the exposure of hydrophobic groups and more subunit components might contain more hydrophobic groups (P<0.05), followed by freeze-drying gelatin and the hot air-drying gelatin. The FTIR results showed that the conformation of gelatin was destroyed by hot air drying and vacuum freeze drying, while spray drying was more conducive to the formation of three helix-structures in the gel formation process. Therefore, this paper can provide a theoretical basis and guiding significance for the drying method and industrial application of green gelatin.

Key words： microwave; drying methods; gelatin

Cite this article

ZHU Juncheng , FENG Xin , LI Lusi , MA Liang , DAI Hongjie , FU Yu , HUANG Shaolin , ZHANG Yuhao . The effect of different drying methods on properties of gelatin[J]. Food and Fermentation Industries, 2021 , 47(8) : 34 -39 . DOI: 10.13995/j.cnki.11-1802/ts.025644

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