食品中二氧化硫现场快速检测方法

Field rapid detection method of sulfur dioxide in food matrices

中文关键词:  食品  二氧化硫  现场快速检测

英文关键词:food matrices  sulfur dioxide  field rapid detection

中文摘要:

      目的 针对目前食品添加剂亚硫酸盐的滥用现象, 寻找出可靠的现场快速测定方法, 应用于食品中二氧化硫的现场快速检测。方法 从市售二氧化硫快速检测试剂盒中筛选出性能较好的两款产品, 分别进行线性、稳定性、检出限测试, 并选择易滥用亚硫酸盐的陈粮、米粉等10种食品基质进行加标测试, 从阳性对照、与国标方法比对、干扰实验等方面进行比较分析。结果 两款试剂盒的线性、稳定性、检出限、加标测试结果良好; 在实测的10种食品基质中, 陈粮、米粉等7种基质的测定效果良好, 鱼糜、冻虾基质会出现阳性干扰; 但两款二氧化硫快速试剂盒均不适用于烤虾基质的测定, 其结果显示假阴性。结论 两款试剂盒均能满足大部分食品中二氧化硫现场快速测定的需求。

英文摘要:

      Objective To find out reliable analytical methods for field rapid detection of sulfur dioxide (SO2) in food matrices, aiming to administrate the abuse of sulfite as food additives. Methods Two products with relatively better performance were picked out from various commercially available SO2 rapid detection kits. Their individual linearity, stability and detection limit were tested. Then recovery, positive control, com-parison with national standardized method and interference test of those two kits were monitored by spiking into 10 different food matrices including old crop and rice noodle, in which sulfite was more frequently abused. Results It was found that both of the two selected kits showed a good linearity, stability, sensitivity and recovery in standard solutions. Among those 10 spiked food matrices, good performance results were obtained in 7 matrices including old crop and rice noodle, while false positive results induced by matrix interference occurred in minced fish and frozen shrimp. However, the two kits were found to be not suitable for rapid detection of roast shrimp since false negative results were obtained. Conclusion Both of the two kits can meet the requirements for field rapid detection of SO2 in most food matrices.