MassIVE MSV000081195

Partial Public PXD006796

Absolute quantification of human milk caseins and the whey/casein ratio during the first year of lactation

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Description

Whey proteins and caseins in breast milk provide bioactivities and also have different amino acid composition. Accurate determination of these two major protein classes will therefore provide a better understanding of human milk composition and function and also aid in developing improved infant formulas based on bovine whey proteins and caseins. In this study, we implemented a LC-MS/MS quantitative analysis based on iBAQ label free quantitation to estimate absolute concentrations of alpha-casein, beta-casein and kappa-casein in human milk samples (n=88) collected between day 1 and day 360 post partum. Total protein concentration measured by ninhydrin-based amino acid analysis ranged from 2.03 to 17.52 with a mean of 9.37�3.65 g/L. Casein subunits ranged from 0.04 to 1.68 g/L (alpha-), 0.04 to 4.42 g/L (beta-), and 0.10 to 1.72 g/L (kappa-), with beta-casein having the highest average concentration among the three subunits. Calculated whey/casein ratio ranged from 45:55 to 97:3. Linear regression analyses show significant decreases in total protein, beta-casein, kappa-casein, total casein, and whey/casein ratio during the course of lactation. Our study presents a novel and accurate analysis of human milk casein content, demonstrating a lower casein content than earlier believed, which has implications for improved infants formulas. [dataset license: CC0 1.0 Universal (CC0 1.0)]

Keywords: milk

Contact

Principal Investigators:
(in alphabetical order) 		Bo L�nnerdal, UC Davis, United States
Submitting User: brettsp1

Publications

Liao Y, Weber D, Xu W, Durbin-Johnson BP, Phinney BS, Lönnerdal B.
Absolute Quantification of Human Milk Caseins and the Whey/Casein Ratio during the First Year of Lactation.
J. Proteome Res. 2017 Nov 3;16(11):4113-4121. Epub 2017 Oct 9.

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