Fatty acid profile of goat milk from the Rhodopes mountain with regard to the composition of fat in dairy products and its utility
2007
Mikhajlova, G. | Odzhakova, Ts.
The study was performed on bulked goat milk obtained in the region of the Rhodopes mountain from two groups of goats: group I ЁC local breed and group II - crosses of local goats with Saanen bucks. Milk samples were obtained after mixing the morning and evening milks according to rules for milk sampling. The milk fat was extracted from crude milk and was stored at -18 oC until analysis. Methyl esters of fatty acids were obtained by methylation of fat with sodium methylate and afterwards, the acids were separated on a Pay Unicam 304 gas chromatograph with a flame ionization detector, manual injection pump and ECTM WAX capillary column (30 m x 0.25 mm, i. d.; 0.25 ¦Мm film), under a programmed temperature regimen and §Ї2 as a carrier gas. It was found out that the total amount of saturated fatty acids was relatively high for the studied goat milk originating from the Rhodopes mountain region - 73-74%. The sum of lauric, myristic and palmiti c acids was 38.40% in the milk of local goats and 39.77% in the milk of crosses. The total amount of essential linoleic and linolenic acids was almost equal for the milk of both groups (about 3%). The ratio of omega-6/omega-3 fatty acids (§і18:2/§і18:3) was about 2:1. The high ratio of saturated/polyunsaturated and the low value of the saturated/unsaturated fatty acids is important with regard to the good stability of milk fat to oxidation, better manifested in the milk of local goats.
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