包装材料对新疆喀什地区多浪羊肉贮藏品质的影响

Influences of Packaging Materials on Mutton Storage Quality of Duolang Sheep in Kashgar Region of Xinjiang

以新疆喀什地区多浪羊的后腿红肉为试材,用14丝聚酯透明真空袋、16丝聚酯透明真空袋和20丝纯铝箔平口真空袋包装羊肉,0℃下冷藏,每2d检测其品质指标,研究包装材料对其贮藏品质的影响。结果表明,随着贮藏时间的延长,各包装处理羊肉其红度a*值逐渐减小、色泽变暗、持水性变差、感官品质下降;羊肉的失重率、蒸煮损失率、pH、挥发性盐基氮含量及菌落总数逐渐升高,羊肉品质变差;贮藏至10d时,3种包装袋包装的羊肉pH均小于6.0,挥发性盐基氮含量均低于150mg/kg,菌落总数都在6lg(CFU/g)以下,圴符合二级鲜肉标准;3种包装中,20丝纯铝箔平口真空包装袋包装的羊肉感观品质最好,其红度a*值最高,失重率最小,贮藏前期(8d前)蒸煮损失率及pH均较低,有利于羊肉品质的保持,但其在抑制挥发性盐基氮含量和菌落总数方面与14丝、16丝聚酯透明真空袋相比没有明显优势;16丝聚酯透明真空袋比14丝聚酯透明真空袋包装更有利于保持羊肉品质。

Taking red mutton in hind leg of Duolang sheep in Kashgar region of Xinjiang as test materials,the mutton were packed with 14 one percent mm of polyester transparent vacuum bag,16 one percent mm of polyester transparent vacuum bag and 20 one percent mm of pure aluminum foil flat vacuum bag and stored in refrigerator at 0 ℃.The quality indices of mutton was measured every 2 days to study the influences of packaging materials on the storage quality of mutton.The results showed that: with the extension of storage time,the red degree a * value gradually decreased,color and lustre became dimmer and dimmer,water-holding capacity decreased and sensory quality got worse,and weightless rate,cooking loss rate,pH value,content of volatile salt nitrogen and total colony number of the mutton gradually increased,and the mutton quality deteriorated during storage.On the 10 th day in the storage process,pH value of the mutton packed with 3 kinds of packaging bags was less than 6.0,the content of volatile base nitrogen of them was less than 150 mg/kg,the total number of colonies of them was below 6 lg (CFU/g),which conformed to the security standard of the secondary fresh meat.Among 3 kinds of packaging materials,the mutton packed with 20 one percent mm of aluminum foil bag had the best sensory quality,the highest red degree a * value,the least weight-loss ratio,and lower cooking lose rate and pH value within 8 days in storage,which was beneficial to maintain its quality.But it had no obvious advantages from two aspects of reducing the content of volatile salt nitrogen and total number of colony,compared with 14 and 16 one percent mm of polyester pouch.As for the same packaging material,the thicker the bags were,the more beneficial to keep the mutton quality was,namely it was better to maintain the quality of mutton packed with 16 one percent mm than 14 one percent mm of polyester bags.