Abstract

Whey proteins are the leading proteins class in milk and play an essential role in the immune defense of neonatal mammals. The aim of this study was to analyze whey proteins in bovine, goat and camel milk by label free proteomics techniques. Finally, 840 proteins were identified, which considerably increasing the number of whey proteins identified in these species. The results of the PCA revealed significant differences in whey proteome patterns between bovine, goat and camel milk. Proteins such as PAEP, CST3, SERPING1, CTSB and GLG1 play an important role as markers in the classification of bovine, goat and camel milk. Statistical analysis showed that the relative abundances of many whey proteins such as ALB, LALBA, LTF and LPO were significantly different among different species. GO and KEGG functional analysis have shown that while the distribution of biological functions involved in whey proteins was relatively similar across species, they differed in terms of protein quantity. These data shed light on the quantitative differences and potential physiological functions of whey proteins across species, and may point the way to the production of specific functional whey proteins.

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