Colegio de Postgraduados Campus Córdoba, Córdoba, Mexico.
Poult Sci. 2011 Feb;90(2):473-80. doi: 10.3382/ps.2010-01002.
Lipid oxidation is known to occur rather rapidly in cooked chicken meat containing relatively high amounts of polyunsaturated fatty acids. To assess the lipid oxidation stability of sous vide chicken meat enriched with n-3 and conjugated linoleic acid (CLA) fatty acids, 624 Cobb × Ross broilers were raised during a 6-wk feeding period. The birds were fed diets containing CLA (50% cis-9, trans-11 and 50% trans-10, cis-12 isomers), flaxseed oil (FSO), or menhaden fish oil (MFO), each supplemented with 42 or 200 mg/kg of vitamin E (dl-α-tocopheryl acetate). Breast or thigh meat was vacuum-packed, cooked (74°C), cooled in ice water, and stored at 4.4°C for 0, 5, 10, 15, and 30 d. The lipid oxidation development of the meat was estimated by quantification of malonaldehyde (MDA) values, using the 2-thiobarbituric acid reactive substances analysis. Fatty acid, nonheme iron, moisture, and fat analyses were performed as well. Results showed that dietary CLA induced deposition of cis-9, trans-11 and trans-10, cis-12 CLA isomers, increased the proportion of saturated fatty acids, and decreased the proportions of monounsaturated and polyunsaturated fatty acids. Flaxseed oil induced higher deposition of C18:1, C18:2, C18:3, and C20:4 fatty acids, whereas MFO induced higher deposition of n-3 fatty acids, eicosapentaenoic acid (C20:5), and docosahexaenoic acid (C22:6; P < 0.05). Meat lipid oxidation stability was affected by the interaction of either dietary oil or vitamin E with storage day. Lower (P < 0.05) MDA values were found in the CLA treatment than in the MFO and FSO treatments. Lower (P < 0.05) MDA values were detected in meat samples from the 200 mg/kg of vitamin E than in meat samples from the 42 mg/kg of vitamin E. Nonheme iron values did not affect (P > 0.05) lipid oxidation development. In conclusion, dietary CLA, FSO, and MFO influenced the fatty acid composition of chicken muscle and the lipid oxidation stability of meat over the storage time. Supranutritional supplementation of vitamin E enhanced the lipid oxidation stability of sous vide chicken meat.
众所周知,含有相对较高量多不饱和脂肪酸的熟鸡肉中的脂质氧化会相当快地发生。为了评估富含 n-3 和共轭亚油酸(CLA)脂肪酸的真空低温烹调鸡肉的脂质氧化稳定性,在 6 周的饲养期内饲养了 624 只科宝×罗斯肉鸡。鸡只饲喂含有 CLA(50%顺式-9,反式-11 和 50%反式-10,顺式-12 异构体),亚麻籽油(FSO)或鲱鱼油(MFO)的饮食,每个饮食均补充 42 或 200mg/kg 的维生素 E(dl-α-生育酚乙酸酯)。将鸡胸肉或鸡腿肉真空包装,在 74°C 下烹饪,在冰水中冷却,然后在 4.4°C 下储存 0、5、10、15 和 30d。通过使用 2-硫代巴比妥酸反应物质分析来定量测定丙二醛(MDA)值来估计肉的脂质氧化发展。还进行了脂肪酸,非血红素铁,水分和脂肪分析。结果表明,饮食 CLA 诱导顺式-9,反式-11 和反式-10,顺式-12 CLA 异构体的沉积,增加了饱和脂肪酸的比例,降低了单不饱和和多不饱和脂肪酸的比例。亚麻籽油诱导 C18:1,C18:2,C18:3 和 C20:4 脂肪酸的沉积更高,而 MFO 诱导 n-3 脂肪酸,二十碳五烯酸(C20:5)和二十二碳六烯酸(C22:6)的沉积更高(P <0.05)。肉的脂质氧化稳定性受到饮食油或维生素 E 与储存天数相互作用的影响。CLA 处理中的 MDA 值低于 MFO 和 FSO 处理中的 MDA 值(P <0.05)。在 200mg/kg 维生素 E 的肉样中检测到的 MDA 值低于在 42mg/kg 维生素 E 的肉样中检测到的 MDA 值(P <0.05)。非血红素铁值对脂质氧化发展没有影响(P> 0.05)。总之,饮食 CLA,FSO 和 MFO 影响鸡肉肌肉中的脂肪酸组成和肉在储存时间内的脂质氧化稳定性。超营养补充维生素 E 增强了真空低温烹调鸡肉的脂质氧化稳定性。