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Investigations of the health benefits of buttermilk fat globule membrane lipid components

Kuchta, Anna (2011) Investigations of the health benefits of buttermilk fat globule membrane lipid components. PhD thesis, Dublin City University.

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Abstract

The milk fat globule membrane (MFGM) that surrounds fat globules in milk is a natural source of sphingolipids, phoshpholipids and proteins with defined anticancer properties. Dairy processing operations can affect the structure and composition of MFGM, potentially influencing its anticancer activity. The aim of this project was to determine if anticancer activity can be attributed to sweet and fermented buttermilks which contain fragments of MFGM and examine if different milk processing operations (separation, washing, heating and drying) may influence the antiproliferative activity of resultant buttermilks. After 3 days of incubation sweet pasteurized buttermilk at the concentration of 0.38 mg total solids/ml significantly (P ≤ 0.001) inhibited growth of SW480 human colon cancer cells by 97.5% but had no toxic effect on FHC human normal colon cells as determined by the acid phosphatase cytotoxicity assay. Antiproliferative activity was lost after spray drying of buttermilk but was retained after heat treatment and freeze and spin drying. In contrast to natural buttermilks, fermented buttermilks inhibited growth to a lesser extent. Analysis of mitochondrial permeability and phoshatidylserine exposure in cells using flow cytometry suggest induction of apoptosis as a biological mechanism involved in the inhibitory effect exerted by buttermilk fractions on cancer cell growth.

Item Type:Thesis (PhD)
Date of Award:November 2011
Refereed:No
Supervisor(s):Devery, Rosaleen and Stanton, Catherine
Uncontrolled Keywords:milk fat globule membrane; MFGM; anticancer activity
Subjects:Biological Sciences > Biology
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Biotechnology
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:Teagasc Walsh Fellowship
ID Code:16641
Deposited On:30 Nov 2011 09:55 by Rosaleen Devery. Last Modified 30 Nov 2011 09:55

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