关键词: 法医病理学, 法医毒理学, 中毒, 甲氨基阿维菌素苯甲酸盐, 死后再分布, 小鼠

Abstract: Objective To investigate the lethal blood level, the target organs and tissues, the toxicant storage depots and the postmortem redistribution in mice died of emamectin benzoate poisoning. Methods The mice model of emamectin benzoate poisoning was established via intragastric injection. The main poisoning symptoms and the clinical death times of mice were observed and recorded dynamically in the acute poisoning group as well as the sub-acute poisoning death group. The pathological and histomorphological changes of organs and tissues were observed after poisoning death. The biodistribution and postmortem redistribution of emamectin benzoate in the organs and tissues of mice were assayed by the enzyme-linked immunosorbent assay （ELISA） at 0 h, 24 h, 48 h and 72 h after death. The lethal blood concentrations and the concentrations of emamectin benzoate were detected by high performance liquid chromatography （HPLC） at different time points after death. Results The symptoms of nervous and respiratory system were observed within 15-30 min after intragastric injection. The average time of death was （45.8±7.9） min in the acute poisoning group and （8.0±1.4） d in the sub-acute poisoning group, respectively. The range of acute lethal blood level was 447.164 0-524.463 5 mg/L. The pathological changes of the organs and tissues were observed via light microscope and immunofluorescence microscope. The changes of emamectin benzoate content in the blood, heart, liver, spleen, lung, kidney and brain of poisoning mice showed regularity within 72 h after death （P<0.05）. Conclusion The target organs of emamectin benzoate poisoning include heart, liver, kidney, lung, brain and contact position （stomach）. The toxicant storage depots are kidney and liver. There is emamectin benzoate postmortem redistribution in mice.

Key words: forensic pathology, forensic toxicology, poisoning, emamectin benzoate, postmortem redistribution, mice