Gas chromatographic and high performance liquid chromatographic determination of d-phenothrin (sumithrin) in formulations [Synthetic pyrethrins]

Gas chromatographic (GC) and high performance liquid chromatographic (HPLC) methods were developed for determination of a synthetic pyrethroid, 3-phenoxybenzyl d-cis,trans chrysanthemate (d-phenothrin, Sumithrin®) in formulations, such as aerosol, dust, emulsifiable concentrate (EC), oil and premix, and also of coexisted other active ingredients. The active ingredients in formulations were determined by GC on a column of 2% DEGS using 2,2′- biquinoline as internal standard, and by HPLC on a column of μBondapak Phenyl® with acetonitrile-water (3 + 2) as a mobile phase. Optical isomers of d-phenothrin were hydrolyzed to corresponding chrysanthemic acids, which were derivatized into diastereomer esters with d-2- or l-2-octanol and determined by GC on a glass capillary column of silicone DC QF-1.