Table 1. Separation of enantiomers of selected synthetic pyrethroids and organophosphates on chiral HPLC columns.

	Retention time, min
Compound	(+) Enantiomers	(–) Enantiomers
cis-Bifenthrin*	10.57	11.25
cis-Permethrin*	17.41	19.06
trans-Permethrin*	27.32	28.29
Fonofos†	12.73	14.86
Profenofos†	23.29	27.35

^*Results from the Sumichiral OA-2500I column

^†Results from the Chiralcel OJ column