马口铁包装水果罐头中锡的浓度变化和形态分布研究

目的 研究马口铁包装水果罐头中锡的浓度变化和形态分布。方法 采用电感耦合等离子体串联质谱法(inductively coupled plasma tandem mass spectrometry, ICP-MS/MS)测定马口铁包装水果罐头的锡含量，并分析锡浓度随储存时间、加热次数的变化特点；采用高效液相色谱电感耦合等离子体串联质谱法(high performance liquid chromatography-inductively coupled plasma tandem mass spectrometry, HPLC-ICP-MS/MS)测定并分析罐头中锡的形态分布。结果 镀锡马口铁包装水果罐头中锡含量在生产日期3个月内为27.17~183.81 mg/kg，生产日期12个月时为54.56~265.44 mg/kg，锡浓度随储存时间、加热次数而明显增加，溶出锡为无机形态，以二价锡SnII]为主，未检测到锡的有机形态。结论 马口铁包装水果罐头中锡随储存时间和加热次数而大量增加，但都以无机锡的形态存在，因吸收利用率低，毒性较低；尽量选择靠近生产日期的产品，且不要罐内加热食用。

Concentration variation and morphological distribution of tin in tinplate packaged fruit cans

Objective To study the concentration changes and morphological distribution of tin in tinplate packaged fruit cans. Methods The tin content of tinplate packaged fruit cans was determined by inductively coupled plasma tandem mass spectrometry(ICP-MS/MS), and the characteristics of tin concentration changes with storage time and heating times were analyzed. High performance liquid chromatography-inductively coupled plasma tandem mass spectrometry(HPLC-ICP-MS/MS) was used to determine and analyze the morphological distribution of tin in cans. Results The tin content of tinplate packaged fruit was 27.17-183.81 mg/kg within 3 months of the production date, and 54.56-265.44 mg/kg within 12 months of the production date. The tin concentration increased significantly with storage time and heating times. The dissolved tin was inorganic form, mainly divalent tin SnII], and no organic form was detected. Conclusions Tin in canned tinplate packaged fruits increases with storage time and heating times, while it exists in the form of inorganic tin. Because of its low absorption and utilization rate, toxicity is relatively low. Try to choose products those are close to the production date and do not consume them heated in the can.