Analysis of total free and glucose-conjugated pyrethroid acid metabolites in tea infusions as hexafluoroisopropyl esters by gas chromatography with electron capture detection.
A gas chromatographic method with electron capture detection (GC-ECD) has been developed to quantitate the sum of free acids of pyrethroid metabolites, their glucosides, and their other base-cleavable conjugates that are extracted from tea leaves when a tea infusion is prepared. Four representative glucoside conjugates were synthesized; hydrolytic conditions were established; and extraction, derivatization and GC conditions were developed for analysis of these pyrethroid acid metabolites at > or = 0.01 ppm on dry tea. GC/mass spectrometry was used to confirm assignment of residues found in some tea samples.
Mortimer
R D
RD
Health Protection Branch, Bureau of Chemical Safety, Ottawa, ON, Canada.
Weber
D F
DF
Sun
W F
WF
D002849:Chromatography, Gas / Q000379:methods*; D005960:Glucosides / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis* / Q000378:metabolism; D013662:Tea / Q000737:chemistry*
D005960:Glucosides; D011722:Pyrethrins; D013662:Tea