Turner T.D., Meadus W.J., Mapiye C., Vahmani P., López-Campos Ó., Duff P., Rolland D.C., Church J.S., Dugan M.E.R.
Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada; Thompson Rivers University, 900 McGill Road, Kamloops, BC, Canada; Department of Animal Sciences, Faculty of AgriSciences, Stellenbosch University, P. Bag X1, Matieland, South Africa; Livestock Gentec, 1400 College Plaza 8215 112 Street, Edmonton, AB, Canada
Turner, T.D., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada, Thompson Rivers University, 900 McGill Road, Kamloops, BC, Canada; Meadus, W.J., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada; Mapiye, C., Department of Animal Sciences, Faculty of AgriSciences, Stellenbosch University, P. Bag X1, Matieland, South Africa; Vahmani, P., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada; López-Campos, Ó., Livestock Gentec, 1400 College Plaza 8215 112 Street, Edmonton, AB, Canada; Duff, P., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada; Rolland, D.C., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada; Church, J.S., Thompson Rivers University, 900 McGill Road, Kamloops, BC, Canada; Dugan, M.E.R., Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, Canada
Polyunsaturated fatty acids typically found in cattle feed include linoleic (LA) and α-linolenic acid (ALA). In the rumen, microbes metabolize these resulting in the formation of biohydrogenation products (BHP), which can be incorporated into meat and milk. Bioactivities of LA-BHP, including conjugated linoleic acid (cis (c) 9,trans (t) 11-18:2 and t10,c12-18:2) and trans fatty acid isomers (t9-, t10- and t11-18:1) have been investigated, but effects of several BHP unique to ALA have not been extensively studied, and most ALA-BHP are not commercially available. The objective of the present research was to develop methods to purify and collect ALA-BHP using silver ion (Ag+) chromatography in sufficient quantities to allow for convenient bioactivity testing in cell culture. Fatty acid methyl esters (FAME) were prepared from perirenal adipose tissue from a cow enriched with ALA-BHP by feeding flaxseed. These were applied to Ag+-solid phase extraction, and eluted with hexane with increasing quantities of acetone (1, 2, 10, 20%) or acetonitrile (2%) to pre-fractionate FAME based on degree of unsaturation and double bond configuration. Fractions were collected, concentrated and applied to semi-preparative Ag+-high performance liquid chromatography (HPLC) for the isolation and collection of purified isomers, which was accomplished using isocratic elutions with hexane containing differing amounts of acetonitrile (from 0.015 to 0.075%). Purified trans-18:1 isomers collected ranged in purity from 88 to 99%. Purity of the ALA-BHP dienes collected, including c9,t13-18:2, t11,c15-18:2 and t10,c15-18:2, exceeded 90%, while purification of other dienes may require the use of other complementary procedures (e.g. reverse phase HPLC). © 2014.