Efeito da radiação gama e do armazenamento na oxidação lipídica e no colesterol de carne de cordeiros da raça Santa Inês

Abstract

Various factors (weigh, sex, diet and breeding) influence the composition of fatty acids from lamb. The present study compared the effects of the irradiation doses (0, 2, 4 kGy) and refrigerated storage (4°C) for 15 days in the cholesterol values and TBARS (substances reactivate to acid tiobarbituric) of lamb treated with different diets. The values of TBARS (0.2722 to 0.5186mg MDA.kg-1) increased with storage and irradiation (3.5174 to 5.7202 mg MDA.kg-1), indicating that both affect the lipids oxidation. The cholesterol rates (56.64 to 79.29 mg.100 g-1) decreased with storage (32.53 to 53.54 mg.100 g-1), however they increased with a dose of 2 kGy for the second time of storage. The diet also influenced the levels of TBARS and of cholesterol from lamb. Diet control presented values independently from the irradiation doses lower than TBARS and of the time of storage. The cholesterol showed more influence for the time of storage than for the irradiation doses and studied diets.