应用三甲胺/氧化三甲胺摩尔比值评价鲈鱼的新鲜程度

Freshness of Lateolabrax japonicus based on mole ratio of TMA and TMAO

为了有效而简便地对鱼类等水产品进行新鲜程度的评价,提出通过三甲胺/氧化三甲胺(TMA/TMAO)摩尔比值对鲈鱼的新鲜程度进行测定,验证TMA/TMAO摩尔比值作为测定鲈鱼新鲜度指标的可行性。结果表明:随着贮藏时间的增加,TMA和TMAO变化趋势不稳定,很难对鲈鱼做出准确的鲜度评价,而鲈鱼在0、5℃贮藏条件下的TMA/TMAO摩尔比值呈稳定的上升趋势,并且同一贮藏温度下TMA/TMAO摩尔比值与挥发性盐基氮值、菌落总数显著相关(P<0.01),相关系数r均大于0.900。说明TMA/TMAO摩尔比值可以作为判定鲈鱼新鲜度的指标。

In order to detect the freshness of fish simply and effectively, the method of using the mole ratio of TMA and TMAO was applied to measure the freshness of Lateolabrax japonicus to verify its feasibility. The result showed TMA and TMAO grew unsteadily and the mole ratio of TMA and TMAO grew steadily with the increasing storage time. So it＇s difficult to detect the freshness of fish by TMA and TMAO. Moreover, there was good correlations between the mole ratio of TMA and TMAO and total volatile base nitrogen, total aerobic counts. （p〈0.01）, and all the correlation coeffiecients were more than 0.900. Thus the mole ratio of TMA and TMAO can be used as a effectively method to detect Lateolabrax japonicus freshness.