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The analysis of pyrethrum flowers [PDF]
Journal of the Society of Chemical Industry, 1949 AbstractIt is shown that in the assay of pyrethrum flowers the customary use of warm solvent (soxhlet) gives erroneously high results for pyrethrin II, especially when the higher‐boiling grades of ligroin are used. Cold extraction gives lower results for pyrethrin II, and largely eliminates the variations in the results obtained with different grades ...
F. H. Tresadern, W. M. Mitchell
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Triterpenoids from Pyrethrum tatsienense.
ChemInform, 2006AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Yan-Ping Shi +3 more
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A Disease of Pyrethrum in Kenya
Nature, 1947The demand for pyrethrum (Chrysanthemum cinerariifolium) resulted in a greatly increased production of this profitable crop in Kenya during the War. It has been cultivated commercially in Kenya since 1928. From 1,864 tons in 1938, the yield rose to 7,409 tons from 52,837 acres in 1945.
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Outlook on Agriculture, 1964
Of permanent benefit to developing African countries is precise knowledge, stemming from research and often years of practice, about growing and processing natural products for which there is likely to be a continuing world demand. Coffee, sisal, and, not least, pyrethrum fall in this category in Kenya. Dr.
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Of permanent benefit to developing African countries is precise knowledge, stemming from research and often years of practice, about growing and processing natural products for which there is likely to be a continuing world demand. Coffee, sisal, and, not least, pyrethrum fall in this category in Kenya. Dr.
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Pyrethrum dermatitis I. The allergenic properties of various extracts of pyrethrum flowers
Pesticide Science, 1972AbstractExtracts of pyrethrum flowers were obtained by treatment with various aqueous and organic solvents. These were tested for immediate and delayed hypersensitivity reactions in guinea pigs previously sensitised to pyrethrum by single subcutaneous injection of the ground flowers suspended in Freund's complete adjuvant.
Frank E. Rickett +2 more
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Pyrethrum Culture Investigations in Nebraska*†
Journal of the American Pharmaceutical Association (Scientific ed.), 1946The results of an investigation with Pyrethrum concerned with spacing, yield, and potency of plots of this plant under experimental cultivation in the several altitude ranges of the state are presented.
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Alkaloids from Anacyclus pyrethrum
PhytochemistryTwelve undescribed alkaloids, including eight pyrrolo[3,2-g]isoquinoline alkaloids (+)/(-)-anacyquinoline A (1a/1b), (±)-anacyquinoline B (2), (+)/(-)-anacyquinoline C (3a/3b), (±)-anacyquinoline D (4), (±)-anacyquinoline E (5), and (±)-anacyquinoline F (6), together with four pyrrolo[2,3-g]quinoline alkaloids (+)/(-)-anacyquinoline G (7a/7b ...
Hui Chen, Haji Akber Aisa
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STUDIES ON THE PHOTOLYSIS OF PYRETHRUM
Annals of Applied Biology, 1960The rates of photolysis of films of pyrethrum were studied to determine the factors which could contribute to their increased stability.The claims that the green colouring matter (referred to as chlorophyll) present in crude oleoresin contributed to the rapid photolysis of pyrethrum films were verified.
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