基于低场核磁共振技术检测冷鲜滩羊肉的嫩度

Detection of tan-sheep meat tenderness based on low-field nuclear magnetic resonance

以宁夏滩羊肉为研究对象,采用低场核磁共振(LF-NMR)技术研究了冷鲜滩羊肉在贮藏过程中水分分布、迁移情况,与羊肉的品质指标p H、肉色(L*、a*、b*)、剪切力等进行相关性分析。结果发现,LF-NMR测得冷鲜滩羊肉的横向弛豫时间T2谱中出现4个水分群,各水分群对应的横向弛豫时间分别为T20、T21、T22、T23,且与各指标间显著性较高(p<0.05),其中T2与剪切力相关系数为-0.996,极显著相关(p<0.01),总峰面积A与剪切力极显著负相关(p<0.01),相关系数为-0.991。为了进一步研究峰面积A、横向弛豫时间T2与剪切力的关系,建立曲线回归方程进行拟合分析,其峰面积A、横向弛豫时间T2与剪切力回归拟合效果较好,回归系数分别为0.960、0.942。研究结果可为滩羊肉在贮藏过程中嫩度的快速检测提供理论依据。

Tan-sheep meat in Ningxia was used to be as the research object, the water distribution and mobility of the cold fresh tan-sheep meat during storage was studied by low-field nuclear magnetic resonance （LF-NMR）technique, and carried on the correlation analysis with the quality indexes such as pH, color （L^＊ , a^＊ , b^ ＊ ） , shear force which were determined. The results found that the NMR transverse relaxation time T2 spectrum data indicated that four distinct water populations were observed in the tan-sheep muscle.Each group of water corresponding to the transverse relaxation time was T20, T21, T22, T23, and with each index was significantly higher （p 〈 0.05 ） , where the relaxation time T2 and shear were significant correlation （p 〈 0.01 ） ,and the correlation coefficient was 0.996 ,the total peak area of A was significantly negative correlation with shear force （p 〈 0.01 ） , and the correlation coefficient was-0.991. To further study the relationship between peak area A, the transverse relaxation time T2 and shear force, established the regression equation curve to be fitting analysis, the peak area of A, transverse relaxation time T2 and the shear stress regression fitting effect were good, regression coefficients respectively were 0.960,0.942. This study would provide theoretical basis for the rapid detection of tan-sheep meat in the process of storage.