双氟沙星及其代谢产物在中华绒螯蟹体内药物代谢及残留消除规律

采用高效液相色谱法,在口灌给药途径下,研究双氟沙星及其代谢产物沙拉沙星在中华绒螯蟹(Eriocheir sinensis)体内的药代动力学.中华绒螯蟹以20 mg/kg剂量给药双氟沙星后,其血淋巴、肌肉、肝胰腺、精巢和卵巢中药物-时间曲线关系符合开放性二室模型.双氟沙星在中华绒螯蟹体内吸收迅速,在不同组织中分布较广,达峰时间短.血淋巴、肌肉、肝胰腺、精巢和卵巢中的Vd分别为3.170 L/kg、2.122 L/kg、1.045 L/kg、1.051 L/kg和0.203 L/kg;双氟沙星在中华绒螯蟹体内消除缓慢,在血淋巴、肌肉、肝胰腺、精巢和卵巢中的消除半衰期t1/2β分别为96.316 h、88.228 h、137.524 h、67.021 h和124.679 h;总体清除率CLa分别为0.783 L/h·kg、0.040 L/h·kg、0.013 L/h·kg、0.011 L/h·kg和0.008 L/h·kg.代谢产物沙拉沙星在中华绒螯蟹血淋巴、肌肉、肝胰腺、精巢和卵巢中药物水平的变化趋势与双氟沙星相似,都呈现多峰现象.但肌肉、肝胰腺、精巢和卵巢4种组织中代谢产物沙拉沙星出现药峰的时候恰好是这4种组织中双氟沙星下降缓慢时期.鉴于双氟沙星及其代谢产物沙拉沙星在中华绒螯蟹体内消除缓慢,而可食组织中脂肪含量较高,因此若规定可食组织中双氟沙星的最大残留限量以脂肪中最大残留限量(100μg/kg)为标准,沙拉沙星的最大残留限量为30μg/kg,则建议双氟沙星在中华绒螯蟹中的休药期大于24d,才能保障食用者的安全.

Pharmacokinetics and the Elimination Regularity of Difloxacin and its Metabolite Sarafloxacin in Eriocheir sinensis

The pharmacokinetics of difloxacin(DIF) and its metabolite sarafloxacin(SAR) in hemolymph,muscle,hepatopancreas,spermary and ovary of Chinese Mitten-handed Crab(Eriocheir sinensis) were studied by RP-HPLC,after administration by single oral garage of 20 mg/kg.The concentrations versus time in hemolymph,muscle,hepatopancreas,spermary and ovary of E.sinensis were well described by a two-department open model.The results of present studies showed that DIF was rapidly absorbed and extensively distributed in E.s...