As shown in Table 2 , the changes of total amino acids of 16 kinds of free amino acids in beef stored at different low-temperatures showed a trend of first decreasing and then increasing.
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Effects of Different Low-Temperature Storage Methods on the Quality and Processing Characteristics of Fresh Beef.
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The value of a* in the refrigeration, frozen, and micro-frozen groups showed a decreasing trend, indicating that the redness was decreasing during the storage process, while the ice temperature group showed a rising trend and the redness was deepened.
Total Volatile Base Nitrogen (TVB-N) Figure 4 demonstrates that with the increase of storage time, TVB-N of each storage mode showed an increasing trend.