Abstract
AbstractA rapid method for the analysis of pyrethrum extract and pyrethrum formulations containing synergists and emulsifying agents has been developed. The pyrethrins are converted into their 2,4‐dinitrophenylhydrazones and, without chromatography, the optical density at 377 mp determined. The optical density is converted into pyrethrin concentration by using the value ϵ = 28,000 for the molecular extinction coefficient of the pyrethrin dinitrophenylhydrazones.
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