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

Head S. W. | Zendy

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

Author(s) -

Head S. W.

Publication year - 1964

Publication title -

journal of the science of food and agriculture

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.782

H-Index - 142

eISSN - 1097-0010

pISSN - 0022-5142

DOI - 10.1002/jsfa.2740150608

Subject(s) - pyrethrum , chemistry , chromatography , molar absorptivity , optical density , pesticide , physics , optics , agronomy , biology , medicine , ophthalmology

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, without chromatography , the optical density at 377 m p 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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