Efeito do grupo racial e do método de metilação sobre o perfil de ácidos graxos da carne caprina do nordeste brasileiro.

Abstract

This research was conducted at the Meat Laboratory, Department of Food Technology and at the Chromatography Laboratory, Department of Chemistry and Physical Chemistry, Federal University of Ceará. The objective of the study was to compare the fatty acid composition on meat from two breeds of goats from northeast Brazil (Bôer x SRD and Anglo Nubiana x SRD) analyzed by gas chromatography after two procedures (acid and alkaline hydrolysis) to prepare methyl ester derivatives. The experimental design consisted of 4 treatments including two breeds and two types of hydrolysis. Data were analyzed by the GLM procedure (SAS Institute, 2000) and the means were compared by the t-test. Results showed significant (p<0.05) differences in fatty acid composition between breeds. Main differences were detected for the saturated fatty acids C8:0, C10:0, C12:0 and C13:0 which were higher in the Anglo Nubiana x SRD meat related to the Bôer x SRD meat. Hydrolysis procedure, on the other hand, showed no significant (p<0.05) effect for most of the fatty acids except for C18:1t9 which was lower when the derivatization procedure included alkaline hydrolysis. The breed of the animals, therefore, affects the relative composition of fatty acids of the meat. It can be concluded that Anglo Nubiana x SRD goats from northeast Brazil produce meat of better quality than that from Bôer x SRD goats related to fatty acid composition. Alkaline hydrolysis does not affect the yield of most of the fatty acids but it can reduce the yield of the monounsaturated fatty acids of the trans C18 series when analyzed by gas chromatography.