鱼籽酱中盐酸环丙沙星和恩诺沙星高效液相色谱检测方法的建立
Detection of Ciprofloxacin Hydrochloride and Enrofloxacin in Caviar by HPLC
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摘要: 建立了鱼籽酱中盐酸环丙沙星和恩诺沙星的高效液相色谱—荧光检测方法。样品经甲醇及酸化乙腈提取,提取液经氮吹浓缩,残渣用2mL流动相溶解,正己烷脱脂净化,采用Eclipse XDB-C18色谱柱,以乙腈∶0.02mol·L-1草酸(14∶86)为流动相,荧光检测器检测。盐酸环丙沙星和恩诺沙星的检出限分别为1、0.5μg·kg-1,在添加量5~120μg·kg-1范围内,平均回收率均大于80%,相对标准偏差均小于5%。说明该方法灵敏、准确,满足常规残留检测要求。Abstract: A method was developed for the determination of Ciprofloxacin Hydrochloride and Enrofloxacin in Caviar by high performance liquid chromatography with fluorescence detection.The homogenized sample was extracted with methanol and acidified acetonitrile.The extract was concentrated by nitrogen,and redissolved into 2mL mobile phase and defatted with n-hexane.Ciprofloxacin Hydrochloride and Enrofloxacin were separated on Eclipse XDBC18 Column with mobile phases containing acetonitrile and 0.02 mol·L-1 oxalic acid(14∶86)and finally determined by fluorescence Detector.The detection limit of Ciprofloxacin Hydrochloride and Enrofloxacin were 1μg·kg-1 and 0.5μg·kg-1,separately.In the range of 5-120μg·kg-1,the mean recoveries were more than 80%.The intraday and interday precisions were less than 5%.It showed that this accurate and sensitive method could be applied for the conventional residue testing requirements.