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. 2014 Oct 3;31(3):1386-93.
doi: 10.3305/nh.2015.31.3.8120.

Are Fat Acids of Human Milk Impacted by Pasteurization and Freezing?

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Are Fat Acids of Human Milk Impacted by Pasteurization and Freezing?

Luiz Antônio Borgo et al. Nutr Hosp. .
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The Human Milk Bank undergo human milk to pasteurization, followed by storage in a freezer at -18° C for up to six months to thus keep available the stocks of this product in maternal and infant hospitals. The objective of this study was to evaluate the effects of processing on the lipid fraction of human milk. A sample of human milk was obtained from a donor and was subdivided into ten sub-samples that was subjected to the following treatments: LC = raw milk; T0 = milk after pasteurization; T30 = milk after pasteurization and freezing for 30 days; T60 = milk after pasteurization and freeze for 60 days, and so on every 30 days until T240 = milk after pasteurization and freezing for 240 days, with 3 repetitions for each treatment. Lipids were extracted, methylated and fatty acid profiles determined by gas chromatography. The fatty acids were characterized by nuclear magnetic resonance and functional groups were identified by infrared spectroscopy. There were variations in the concentration of fatty acids. For unsaturated fatty acids there was increasing trend in their concentrations. The IR and NMR analyze characterized and identified functional groups presents in fatty acids.

Los Bancos de Leche Humana someten la leche la pasteurización, seguido del almacenamiento en un congelador a -18 grados por até seis meses, para así disponerlo a los Hospitales Materno Infantiles. El objetivo de este estudio fue evaluar los efectos del procesamiento de la fracción lipídica de la leche humana. Para esto, una muestra obtenida de una donante y sometida a diez diferentes tratamientos: LC = leche cruda; TO = leche después de la pasteurización; T30 = leche después de la pasteurización y congelación por 30 días; T60 = leche después de la pasteurización y congelación por 60 días y así sucesivamente a cada 30 días hasta T240 = leche después de la pasteurización y congelación por 240 días, con tres repeticiones a cada tratamiento. Los lípidos fueron extraídos y los ácidos grasos metilados fueron determinados por cromatografía gaseosa. Los ácidos grasos fueron caracterizados por resonancia magnética nuclear y los grupos funcionales identificados por espectroscopia infrarroja. Hubo variaciones en las concentraciones de ácidos grasos. Para los ácidos grasos insaturados hubo un aumento en sus concentraciones. Sin embargo, los grupos funcionales se caracterizaron por espectroscopia infrarroja y resonancia magnética nuclear, RMN.

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