Pyrethrum analysis: an infrared method

Mitchell, William; Byrne, J. H. N.; Tresadern, F. H.

doi:10.1039/an9638800538

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1964

1973

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Rapid method for the determination of ‘total pyrethrins’ by spectroscopy of their 2,4‐dinitrophenylhydrazones

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1964

J Sci Food Agric

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A 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, wwithout chromatography, the optical density at 377 mp determined. The optical density is converted into pyrethrin concentration by using the value E = 28,000 for the molecular extinction coefficient of the pyrethrin dinitrophenylhydrazones.

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