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The chemical evaluation of pyrethrum flowers (Chrysanthemum cinerariifolium). The extraction of the flowers for analysis and the preparation of colourless concentrates of the pyrethrins

Published online by Cambridge University Press:  27 March 2009

J. T. Martin
J. T. Martin
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Extract

1. Biological trials have been carried out to determine the efficacy of petroleum ether as solvent for the extraction of pyrethrum flowers for analysis. 95% of the toxic material was extracted from flowers one year old after only 3 hr. percolation. An extraction period of 8 hr. with petroleum ether is suggested.

2. A method of preparing colourless extracts of pyrethrum and analytical data for such extracts are given. They are shown to be of value for the preparation of concentrates of the pyrethrins. The preparation of a colourless concentrate containing 93% of total pyrethrins, as determined by a modified Seil method, is described.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 31 , Issue 2 , April 1941 , pp. 178 - 185
Copyright
Copyright © Cambridge University Press 1941

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References

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