Feed additives diclazuril and nicarbazin in egg and liver samples from Croatian farms

In total 307 egg and 275 liver samples were examined for nicarbazin and 365 eggs for diclazuril over a 30-month period. Enzyme-linked immunosorbent assay methods used for quantification were validated according to European Commission Decision 2002/657/EC. Non-compliant samples were confirmed by LC-MS/MS. Mean diclazuril concentrations in egg samples were 0.31?µg?kg^?1, which is below the MRL. In only one egg sample, 2.26?µg?kg^?1 was determined by enzyme-linked immunosorbent assay, although confirmation by LC-MS/MS gave a value of 1.6?µg?kg^?1. Mean nicarbazin levels determined were 1.85?µg?kg^?1 in egg and 21.1?µg?kg^?1 in liver samples. Four samples, one egg and three livers, yielded elevated concentrations of nicarbazin, but only in the egg sample the LC-MS/MS method confirmed nicarbazin (106?µg?kg^?1) above the MRL value.     

高效液相色谱法测定鸡组织中尼卡巴嗪标识残留物

应用高效液相色谱法测定鸡组织中尼卡巴嗪标识残留物-- 4,4＇- 二硝基均二苯脲。试样经乙腈-0.5g/mL氢氧化钾溶液提取,正己烷脱脂净化,用高效液相色谱仪(C18 柱)分析,流动相为乙腈- 体积分数1% 乙酸溶液(53:47,V/V),流速1.0mL/min,紫外检测波长为350nm。对鸡肉、鸡肝和鸡蛋样品进行0.05～0.50mg/kg 的药物添加回收实验,4,4＇- 二硝基均二苯脲的平均回收率为93.6%～102.0%(n=10),相对标准偏差为2.8%～10.4%,方法的定量限为0.05mg/kg。该法简便、准确,适用于鸡组织中尼卡巴嗪标识残留物4,4＇- 二硝基均二苯脲的检测。