title: Separation and analysis of the pyrethrins by combined gas-liquid chromatography-chemical ionization mass spectrometry.
abstract: Pyrethrins, the 6 naturally occurring insecticidal esters of pyrethrum extract, were analyzed by combined gas-liquid chromatography-chemical ionization mass spectrometry. Separation was best on an OV-25 column with temperature programming; The chemical ionization mass spectra for the 6 esters as well as for the thermally isomerized pyrethrins I and II are reported and discussed. Using selective ion monitoring, a lower limit of detectability of all 6 esters was 114 ng of total extract injected on the column.
mesh_terms: D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D013058:Mass Spectrometry; D008722:Methods; D011722:Pyrethrins / Q000302:isolation & purification*
chemical_list: D011722:Pyrethrins