Food and Fermentation Industries >

2023 , Vol. 49 >Issue 2: 146 - 151

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.031152

Effects of cold storage time of raw milk on physical and chemical indexes of yak milk hard cheese

  • QIU Ting ,
  • ZHANG Zhongming ,
  • ZHANG Weibing ,
  • SONG Xuemei ,
  • WANG Ying ,
  • WEN Pengcheng
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  • 1(College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China)
    2(Functional Dairy Product Engineering Laboratory of Gansu Province, Lanzhou 730070, China)

Received date: 2022-02-22

  Revised date: 2022-03-08

  Online published: 2023-02-15

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Abstract

Cold chain storage and transportation have been widely used in the production process of various dairy products. The refrigeration time has an important impact on the physical and chemical quality of raw milk and cheese. In this study, yak milk refrigerated for 24, 48, and 72 h was used as raw material to make hard cheese and studied its physical and chemical indexes during the ripening process of hard cheese. The results showed that during the cheese ripening period of 0-6 months, the moisture content and fat content showed a decreasing trend, while the NaCl content showed an increasing trend. The pH value decreased in the early stage of maturity, and gradually increased in the later stage of maturity. The pH 4.6 soluble nitrogen, 12% trichloroacetic acid soluble nitrogen, and free amino acids showed an increasing trend. During the whole ripening process, the pH 4.6 soluble nitrogen, 12% trichloroacetic acid soluble nitrogen, and total free amino acid content of three groups of yak milk hard cheese were always 72 h refrigerated group>48 h refrigerated group>24 h refrigerated group. This study is to be of theoretical reference for the refrigeration of yak milk and its application in cheese processing.

Key words： yak milk; hard cheese; refrigeration time; physical and chemical indexes

Cite this article

QIU Ting , ZHANG Zhongming , ZHANG Weibing , SONG Xuemei , WANG Ying , WEN Pengcheng . Effects of cold storage time of raw milk on physical and chemical indexes of yak milk hard cheese[J]. Food and Fermentation Industries, 2023 , 49(2) : 146 -151 . DOI: 10.13995/j.cnki.11-1802/ts.031152

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