论文部分内容阅读
目的应用低场核磁共振技术(low field nuclear magnetic resonance,LF-NMR)测定不同鲜猪肉的制样方法(肉样大小、分切方向、是否包膜)的水分分布,以确定其较佳制样方法。方法以宰后24 h的猪背最长肌为对象,采用单因素实验,分别按不同大小、不同分切方向和包膜与否进行3组实验,对LF-NMR的弛豫时间T_2相关指标进行方差分析和多重比较。结果随着肉样质量的增加,T_(2b)先减小后增大(P<0.05),A_(2b)、A21逐渐增加(P<0.05);肉样分切方向不影响样品水分含量分布测定结果;而包膜使样品的T_(2b)减小、A_(2b)和P-(2b)增加(P<0.05)。结论猪肉的制样样品大小为2.0 cm(长)×1.0 cm(宽)×1.0 cm(高),分切方向为沿肌肉方向,不包膜处理,这种制样方法对样品中水分分布情况的影响最小,能相对准确地反映实际样品中水分分布及含量。
Objective To determine the water distribution of different fresh pork samples by the method of low field nuclear magnetic resonance (LF-NMR) method. Methods The longissimus muscle of porcine dorsum was slaughtered 24 h after slaughter. The effects of LF-NMR on relaxation time T 2 of LF-NMR were studied by single-factor experiment, according to different size, Perform ANOVA and multiple comparisons. Results With the increase of meat quality, T 2b decreased first and then increased (P <0.05), while A 2b and A21 increased gradually (P 0.05). The meat-splitting direction did not affect the distribution of moisture content The results showed that T_ (2b) decreased and A_ (2b) and P- (2b) increased (P <0.05). Conclusion The sample size of pork sample is 2.0 cm (length) × 1.0 cm (width) × 1.0 cm (height). The cutting direction is along the muscle direction without coating treatment. This method of sample preparation for the distribution of water in the sample Of the smallest, can accurately reflect the actual sample of water distribution and content.