题目

英语翻译
MG：孔雀石绿
LMG：隐色孔雀绿
As some of the products,which are sampled are smoked or canned,thus possibly heat-treated,the influence of a higher temperature on the recovery of MG and LMG was studied as well.Salmon spiked at 35 mg/kg MG and 50 mg/kg LMG was homogenized,and after a withdrawal period of 15 min,heated at 70 °C for 20 min.Analyses of these samples showed that heat-treatment affected the recovery of especially MG (29±2%) and to some extent that of LMG (81±1%) compared to recoveries from raw salmon (see above).In contrast,a field sample containing incurred residues at 2.9 mg/kg LMG (see below),showed only 1.960.3 mg/kg after this treatment.Surprisingly,spiking after heating gave higher recoveries for MG (81%) in correspondence with those recoveries from canned salmon,which is heated in the can.Fresh whole trout and eel,and fresh,smoked and canned salmon fillets collected at different local retailers,fish-shops and fish-markets to spread the chance of obtaining a single

提问时间：2021-03-23

答案

与那些从经过熏制或罐装的产品抽样可能经过加热处理一样,较高的温度对MG和LMG回收率的影响也得到研究.刺有35mg/kg MG和50 mg/kg LMG的鲑鱼经过匀浆,静置15分钟后,70度加热20分钟.分析这些样品,显示与生鲑鱼的回收率（见上面）比较,加热处理特别是对MG(29±2%)和一定程度上对LMG(81±1%)的回收率有影响.相反,含有残留LMG（2.9 mg/kg）的背景样品（见下面）,显示在经过处理后只有1.960.3 mg/kg.令人惊奇的是,与那些罐装鲑鱼的回收率比较（它们在罐头内加热）在加热后刺入可以得到更高的MG回收率（81%）.
还研究了从不同的当地零售商收集的新鲜整体鲑鱼和美洲鳗,以及新鲜、熏制和罐装鲑鱼鱼片,以扩大获得一种单独的可疑批次的机会.奇怪的在很多鱼的样本里没有分析到MG残留的存在（表9）.卖者不知来源的虹鳟鱼（但多数可能是培育的）的HPLC–Vis分析显示18个鱼样品中有13个查到痕量的LMG（大约在15 mg/kg).美洲鳗,它们通常被培育成食品,发现也已经被污染.10个样品中有5个含有LMG(大约在10 mg/kg).新鲜鲑鱼片的分析显示单一的样品可以含有2.9 mg/ kg.正如所期待的,这些鱼片的两次HPLC–Vis分析结果,分别为2.86和2.96 mg/kg,表现非常一致.此外,用LC–MS–MS的不同产品离子轨迹检测的其他6份新鲜鲑鱼样品中有4份显示,含有的LMG恰好高于LOD(0.20比0.26 mg/kg).
必须要注意在这些冷藏鱼片中的MG残留物是非常不稳定的（见上面）,提示这些水平可能会明显地高于屠宰时的水平.在五份熏制鲑鱼样品和八份罐装鲑鱼样品中都没有检测到LMG.这些产品经过加热,而这种处理可以减少回收率（见上面）.