Effects of Holder Pasteurization on Immune Composition of Human Milk.

Background: Human milk (HM) is the ideal food for newborn (NB) nutrition, it provides all macro and micronutrients for human growth and development and also contains bioactive compounds, which influence the development of the neonatal digestive and immune systems. The holder pasteurization process is essential to prevent NB infection from donated milk. Therefore, the aim of this study was to check whether or not holder pasteurization could impact the concentration of immune components in HM and the capacity to induce epithelial cell growth. Materials and Methods: The study was performed on raw and holder pasteurized (62.5°C/30 minutes) paired milk samples after submission to the freezing process in both phases. For cytokine and adipokine measurements, ELISA was performed on 40 individual samples of HM from single donors. For analyzes of epithelial cell growth, HuTu-80 cells were cultivated in Minimum Essential Eagle medium with 15% of raw or pasteurized milk, eight pairs of milk were used. Results: The results showed that no alteration was observed in the concentration of cytokine after milk holder pasteurization, and leptin concentration was reduced in holder pasteurized milk. The heat treatment also did not impact the capacity of breast milk to promote intestinal epithelial cell growth. Conclusions: The results showed that donated breast milk pasteurization has a small impact on the HM bioactive concentration compounds. This technique is important to avoid NB infection.