The Relationship Between Pyrethrins And The Yellow Pigmentation in Pyrethrum Flowers
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Date
2003Author
Odinga, Wenwa-Akinyi
Angedu, Charles A
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Various clones and varieties of Chrysanthemum cinerariaefolium flowers
originating from various localities were used in this study to establish the link between pyrethrins
and the yellow pigments in pyrethrum. Pyrethrins content was determined using
spectrophotometric, AOAC and HPLC analytical techniques. Absorbances of I % (w/v) n-hexane
extracts at various wavelengths in the UV and visible regions were read using a double beam
spectrophotometer. This paper presents correlations between total Pyrethrins, individual ester
distributions, Pyrethrins I and Pyrethrins11 ratios and specific colour absorbances (A1%1cm) in
three different regions 260-300nm (1A1%cm), 300-400 nm (2A1%cm) and 400-470 nm (3A1%cm).
The results depict negative colour absorbances in all the three regions. The pigments absorbing
at 266-300 nm show a better correlation with the pyrethrins than pigments absorbing at 400-
470 nm. The pigments at the former region are flavonoids and the latter carotenoids from
spectrophotometric scans and TLC screening.
Citation
The Relationship Between Pyrethrins And The Yellow Pigmentation in Pyrethrum Flowers, Wenwa-akinyi, DrOdinga , African Journal of Science and Technology (AJST) Vol.4, No. 2, pp. 113-119., (2003) copy at http://profiles.uonbi.ac.ke/wakinyi/publications/relationship-between-pyrethrins-and-yellow-pigmentation-pyrethrum-flowersPublisher
University of Nairobi