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The Results of Different Heating Temperatures on Activities of Bioactive Proteins in Human Milk

巴氏杀菌 乳过氧化物酶 乳铁蛋白 溶菌酶 化学 食品科学 黄嘌呤氧化酶 色谱法 生物化学 过氧化物酶
作者
Jie Zhang,John A. Duley,David Cowley,P. Nicholas Shaw,Peng Zhou,Pieter Koorts,Nidhi Bansal
出处
期刊:Journal of Human Lactation [SAGE Publishing]
卷期号:39 (2): 300-307 被引量:8
标识
DOI:10.1177/08903344221124870
摘要

Background: The most utilized pasteurization method in donor human milk banks is Holder pasteurization (heating 62.5 °C for 30 min). However, many bioactive proteins are heat sensitive and are inactivated. Research Aim: To determine the results of a range of heating regimes on the activities of xanthine oxidase, lactoperoxidase and lysozyme, the concentrations of immunoglobulin A and lactoferrin, as well as bacterial inactivation. Method: This prospective, cross-sectional, intervention study was designed to measure the influence of heating temperatures on bioactive components in donor human milk. Milk samples were processed at 40, 50, 55, 62.5, 75, 127 °C and the activities of the enzymes, and the concentration of immune proteins, were measured. Results: No bacterial colonies were detectable, using standard culture methods, after heating above 50 ºC. All proteins studied retained over 60% concentrations or activities when the pasteurization temperature was 50 ºC or lower, while their concentrations or activities were lost at higher temperatures. For lactoferrin, the residual concentration was above 80% when heating temperature was under 55 °C, while only 20% remained after Holder pasteurization. Both xanthine oxidase and lactoperoxidase had little residual activity when temperatures were above Holder pasteurization. Lysozyme retained a greater proportion of residual activity than other proteins, following heating at all temperatures. Conclusions: The concentrations or activities of immune proteins and bioactive enzymes decreased when heated above 50 °C. The results of this study can be used to design temperature control guidance during alternative methods of pasteurization.
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