ACTA VETERINARIA ET ZOOTECHNICA SINICA

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Comparative Proteomics Analysis of Changes of the Milk Protein during Thermal Treatment

ZANG Chang-jiang1,2, WANG Jia-qi2*, YANG Yong-xin2, BU Deng-pan2, YANG Jin-hui2, YUAN Ting-jie1,2, ZHOU Ling-yun2, SUN Peng2, LI Fa-di1*   

  1. (1. College of Animal Science &Technology,Gansu Agricultural University,Lanzhou 730070,
    China;
    2. State Key Laboratory of Animal Nutrition, Institute of Animal Science,Chinese
    Academy of Agricultural Sciences,Beijing 100193,China
  • Received:2012-02-23 Online:2012-11-26 Published:2012-11-26

Abstract:

To investigate the changes of milk protein after treated with 75 ℃/15 s, 125 ℃/4 s, 135 ℃/4 s and 145 ℃/4 s, two-dimensional gel electrophoresis was used to separate proteins samples and mass spectrometry was used to identify differential protein spots. These results showed that four protein spots were down-regulated after treatment with 135 ℃/4 s and 145 ℃/4 s compared with raw milk and milk treated with 75 ℃/15 s in which protein profiles had no difference. These protein spots were identified as α-lactoalbumin, beta-casein variant, κ-casein and Ig γ chain. Content of IgG from raw milk and thermal treated milk was detected using ELISA method and in consistent with data of two-dimensional gel electrophoresis coupled with mass spectrometry. These finding indicated that milk protein contents were not affected by treatment with 75 ℃/15 s and affected by treatment with 135 ℃/4 s and 145 ℃/4 s.

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