分光光度法测定洋葱精油中硫代亚磺酸酯含量

Determination of content of thiosulfinates in onion oil via spectrophotometry

Lawson Larry首次采用分光光度法定量测定硫代亚磺酸酯(TS),采用LawsonLarry的方法来测定洋葱精油中的TS。对测定条件进行完善和校正,并对操作过程进一步改良。得出最佳测定条件为:显色温度在20～30℃,反应体系pH7.5～8.5,反应时间由15min校正为5min。此法经完善改良后,操作更简便易行、准确度高,为以后洋葱精油的质量检测提出指导和参考。

Lawson Larry brought up Thiosulfinates（TS）quantifying methods via spectrophotometry determination for the first time. The determination of the TS content of onion oil using this method with some necessary improvement and calibration was studied. The optimal determining conditions were described as follows：reacting temperature 20~30℃,the pH of the reacting system was 7.5~8.5,time of the reaction decreased from 15min to 5min. With the above improvement,this TS determining method became much more easier and convenient,the accuracy was also improved.