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Content and distribution of conjugated linoleic acid isomers in bovine milk, cheese and butter from Azores

Content and distribution of conjugated linoleic acid isomers in bovine milk, cheese and butter... Pasture intake is a major factor affecting the content and the distribution of the conjugated linoleic acid (CLA) isomers in bovine milk fat. The aim of this study was to determine the CLA contents and its isomeric distribution in milk, cheese and butter from Azores, a Portuguese archipelago in the Atlantic Ocean. The CLA isomers were analysed using Ag+-HPLC with three silver ion columns in series. Butter was the richest product in CLA, with a total of 6.58–7.72 mg·g−1, whereas cheese presented the highest specific CLA content (12.40–14.00 mg·g−1 fat). The CLA isomeric distribution showed a clear predominance of the bioactive cis-9, trans-11 isomer (from 72.26% to 82.59%). The trans-11, cis-13 CLA isomer, a useful indicator of pasture-fed cow’s milk, varied from 2.22% to 3.91%. In conclusion, the Azorean dairy products have a relatively high amount of CLA, especially the cis-9, trans-11 isomer, constituting therefore a good source of these compounds for the human diet. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Dairy Science & Technology Springer Journals

Content and distribution of conjugated linoleic acid isomers in bovine milk, cheese and butter from Azores

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer S+B Media B.V.
Subject
Chemistry; Food Science; Agriculture; Microbiology
ISSN
1958-5586
eISSN
1958-5594
DOI
10.1051/dst/2008040
Publisher site
See Article on Publisher Site

Abstract

Pasture intake is a major factor affecting the content and the distribution of the conjugated linoleic acid (CLA) isomers in bovine milk fat. The aim of this study was to determine the CLA contents and its isomeric distribution in milk, cheese and butter from Azores, a Portuguese archipelago in the Atlantic Ocean. The CLA isomers were analysed using Ag+-HPLC with three silver ion columns in series. Butter was the richest product in CLA, with a total of 6.58–7.72 mg·g−1, whereas cheese presented the highest specific CLA content (12.40–14.00 mg·g−1 fat). The CLA isomeric distribution showed a clear predominance of the bioactive cis-9, trans-11 isomer (from 72.26% to 82.59%). The trans-11, cis-13 CLA isomer, a useful indicator of pasture-fed cow’s milk, varied from 2.22% to 3.91%. In conclusion, the Azorean dairy products have a relatively high amount of CLA, especially the cis-9, trans-11 isomer, constituting therefore a good source of these compounds for the human diet.

Journal

Dairy Science & TechnologySpringer Journals

Published: May 21, 2011

References