SHI Hong-fei,XU Bo-peng,XU Cheng-xin,ZHOU Xiu-qi,ZHOU Yi-fei,LIU Ke-yu,GUO Ming-xin.Detection of Three Alkaloids in Dried Khat by Solvent Extraction/GC-MS[J].Journal of Instrumental Analysis,2025,44(07):1406-1412.
SHI Hong-fei,XU Bo-peng,XU Cheng-xin,ZHOU Xiu-qi,ZHOU Yi-fei,LIU Ke-yu,GUO Ming-xin.Detection of Three Alkaloids in Dried Khat by Solvent Extraction/GC-MS[J].Journal of Instrumental Analysis,2025,44(07):1406-1412. DOI: 10.12452/j.fxcsxb.241012459.
Detection of Three Alkaloids in Dried Khat by Solvent Extraction/GC-MS
Khat is a common source plant for drugs,and cathinone,norpseudoephedrine,and norephedrine are its primary psychoactive components. The extraction conditions were optimized through the detection conditions such as chromatographic heating procedure and mass spectrometry acquisition mode,and the extraction conditions such as the concentration of hydrochloric acid aqueous solution,the amount of sodium hydroxide aqueous solution added,and whether it was concentrated or not. By using the technology of solvent extraction/GC-MS,a detection method of three alkaloids(norephedrine,norepseudoephedrine and cathinone) in dried Khat has been established. Sample was extracted with 0.05 mol/L hydrochloric acid aqueous,purified by aqueous sodium hydroxide solution,extracted with 6 mL of acetonitrile,and then concentrated by nitrogen blowing to 0.5 mL for the qualitative analysis of the cathinone,norephedrine and norepseudoephedrine components in the dried Khat,or 2 mL for the quantitative analysis of the norepseudoephedrine components in the dried Khat. The qualitative analysis was performed on a DB-5MS capillary column(30 m×0.25 mm×0.25 μm) with He as the carrier gas and an electron bombardment ion source(EI) in the full scan(SCAN) mode,and the quantitative analysis was performed in selected ion scan(SIM) mode. The results showed that the qualitative analysis method:the detection limits of the three alkaloids ranged from 13.39 mg/L to 23.43 mg/L,and norephedrine and norepseudoephedrine achieved effective resolution with a separation degree of 0.752. The quantitative analysis method:the limit of quantification(LOQ) for cathinone was 22.3 mg/L,and the recoveries of cathinone spiked at levels of 100 mg/kg,200 mg/kg were 109% and 111% ,the precision of the experimental instrument was 1.6%,the precision of the intra-day method was 1.7%,and the precision of the inter-day method was 2.8%. The method is quantitatively accurate and reproducible,which can meet the requirements of physicochemical test and identification of dry Kha.
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