大气等离子体处理条件下藏羊肉贮藏品质研究

Storage Quality of Tibetan Sheep Meat under Atmospheric Plasma Treatment

摘要:

为明确等离子体处理对藏羊肉贮藏品质的影响，选取欧拉藏羊后腿肉作为材料，对其进行不同时间(0、2、3、4min)等离子体处理后，将肉样置于4℃冰箱贮藏不同时间（0、1、3、5、7d），在不同贮藏时间点分别取样，测定藏羊肉中菌落总数、pH值、色度、质构、蒸煮损失、TBARS值、羰基含量的变化。结果表明：在贮藏7d时，等离子体处理时间为2、3、4min的藏羊肉组菌落总数分别比对照组低18.56%、23.08%、27.09%，pH值分别比对照组低1.53%、2.21%、1.02%，a*值分别比对照组低4.44%、11.71%、21.62%，硬度分别比对照组低5.79%、26.18%、26.43%，蒸煮损失率分别比对照组低1.66、5.26、2.71个百分点(P<0.05)。此外，等离子体处理时间为2、3min藏羊肉组的TBARS值分别比对照组低1.89%、13.21%，羰基含量分别比对照组低11.33%、13.33%，而处理时间为4min的藏羊肉组TBARS值比对照组高13.21%，羰基含量比对照组高13.33%(P<0.05)。由此可见，等离子体处理可有效降低藏羊肉菌落总数，提高嫩度与持水性，然而，较长时间的处理对肉色产生了负面影响。综合来看，等离子体处理时间为3min时，藏羊肉的菌落总数显著降低，嫩度与持水性提高，延缓了脂质和蛋白质氧化。本研究可为大气等离子体技术在羊肉贮藏过程中品质的改善提供理论依据。

Abstract:

With the aim to clarify the effect of plasma treatment on the storage quality of Tibetan sheep meat, the hind legs meat of Tibetan sheep was selected as the material. After plasma treatment for different times (0min,2min,3min,4min), the meat samples were stored in a refrigerator at 4℃ for 0d,1d,3d,5d,7d. The total number of colonies, pH value, color, texture, cooking loss, TBARS value and carbonyl content were measured at different storage time points.The results showed that on the 7d of storage, the total number of colonies in the Tibetan sheep group with plasma treatment time of 2min,3min and 4min was 18.56%, 23.08% and 27.09% lower than that of the control group.The pH values were 1.53%, 2.21% and 1.02% lower than those of the control group.The a* values were 4.44%,11.71% and 21.62% lower than those of the control group. The hardness values were 5.79%,26.18% and 26.43% lower than those of the control group.The cooking loss was 1.66 percentage points,5.26 percentage points and 2.71 percentage points lower than that of the control group, respectively (P<0.05). In addition, the TBARS content of Tibetan sheep group with plasma treatment time of 2min and 3min was 1.89% and 13.21% lower than that of the control group, respectively, and the carbonyl content was 11.33% and 13.33% lower than that of the control group, respectively. The TBARS content of Tibetan sheep group with plasma treatment time of 4min was 13.21% higher than that of the control group, and the carbonyl content was 13.33% higher than that of the control group (P<0.05). It can be seen that plasma treatment can effectively reduce the total number of colonies in Tibetan sheep and improve tenderness and water holding capacity. However, long-term treatment had a negative impact on meat color.On the whole, when the plasma treatment time was 3min, the total number of colonies of Tibetan sheep was decreased significantly, the tenderness and water holding capacity were increased, and the oxidation of lipid and protein was delayed. The research result can provide a theoretical basis for the improvement of the quality of mutton during storage by atmospheric plasma technology.