建立了高效液相色谱-游离酪氨酸法鉴定高蛋白含量辐照食品的方法。向经过辐照的高蛋白含量样品中加入0.1 MOl/l HCl,使细胞裂解并释放出游离酪氨酸,离心除去细胞碎片后,向上清液中加入80%丙酮并在-20℃下冰冻沉淀除去大部分蛋白,样品中的酪氨酸与三氟乙酸形成离子对后经C18色谱柱分离。在100~1 500μg/l质量浓度范围内,邻酪氨酸和间酪氨酸均具有良好线性,方法的回收率为61%~116%,定量下限(S/n≥10)为10μg/l。该法避免了蛋白质的水解,具有操作简便、测定准确等优点,能很好地区分未经辐照与经5 kgy以上剂量辐照的食品。A novel method was presented for identification of irradiated protein-rich food by HPLC with dissociative tyrosine.The procedure involved the homogenization of fresh sample with 0.1 mol/L HCl,followed by centrifugation to remove the cell debris and the solvent precipitation of protein with acetone at-20 ℃,then the tyrosine was separated by forming ion pair with trifluoroacetic acid on a C18 column.The average recoveries of the drugs ranged from 61% to 116% at the spiked levels of 100-800 μg/L.The method is simple and double-quick,and could be efficiently identified food sample irradiated at a dose of 5 kGy or above.国家质量监督检验检疫总局科研计划资助项目(2009IK183
