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目的了解福建与广东两省水产批发市场养殖鱼孔雀石绿(MG)及其代谢物的残留情况;并通过水产批发市场活鱼以及暂养水中MG测定,对养殖鱼MG污染情况进行溯源分析,初步推测养殖鱼MG残留的原因,为有效遏制MG滥用提供科学依据。方法 16个品种的66份鲜活养殖鱼分别购自福建、广东两省的3个水产批发市场,制作成鱼肉浆;来自同一市场的26份水样均为桂花鱼的暂养水;样品经前处理后,采用高压液相色谱-荧光法检测MG及其代谢物LMG的残留总量。结果检出MG的样品占56.1%(37/66),桂花鱼MG检出率最高(75.8%),全部样品总MG含量在0.50~148μg/kg之间。广东福建两省部分水产批发市场鱼类MG检出率在53.3%~60.0%之间,地区间无明显差异。全部水样MG检测均为阴性。结论福建、广东两省部分水产批发市场活鱼MG检出率高,水产批发市场活鱼暂养水不含MG,初步推测桂花鱼运输、批发零售环节使用MG的可能性较少,市售桂花鱼MG检出率高的原因可能是养殖环节MG的滥用。
Objective To understand the residues of malachite green (MG) and its metabolites in aquaculture wholesale markets in Fujian and Guangdong Provinces. Through the traceability analysis of MG contamination of farmed fish, Preliminary speculation on the causes of MG residues in farmed fish, in order to effectively stop the abuse of MG to provide a scientific basis. Methods Sixty-six fresh-keeping cultured fish from 16 varieties were purchased from three aquatic wholesale markets in Fujian and Guangdong provinces, respectively, and made into fish pulp. Twenty-six water samples from the same market were taken as holding water of Osmanthus fragrans. After pretreatment, the total amount of residual LMG in MG and its metabolites was detected by HPLC-fluorescence method. Results MG samples were detected in 56.1% (37/66), Osmanthus fragrans MG was the highest (75.8%), and the total MG content was 0.50-148μg / kg. The detection rates of fish MG in some aquatic wholesale markets in Fujian and Fujian Provinces ranged from 53.3% to 60.0%, with no significant difference between regions. All water samples were negative for MG test. Conclusions The detection rate of live fish MG in some aquatic products wholesale markets in Fujian and Guangdong Provinces is high, and the live fish in aquatic products wholesale market does not contain MG. It is preliminarily estimated that it is less possible to use MG in the transportation and wholesale and retail sectors of osmanthus fish. The reason for the high detection rate of fish MG may be the abuse of MG at the breeding stage.