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- W4230395075 abstract "The spectral characterization was made on aqueous acid extracts of the petals of red rose cultivar Happiness and those of black cultivar Bonne Nuit. When these extracts were heated at 68-75°, the spectral shift from 508mμ to 502mμ came into appearance. The wave length showing minimum transmittance of the petal extract was ca. 6mμ longer than that of the acidic solution of crystalline cyanin, i.e., an anthocyanin component of rose petals. Followingly, it is conceivable that co-pigmentation takes place in these extracts.From the comparison of spectral transmittance curves in detail, it was shown that the petal extracts exhibit some hyperchromic and bathochromic effects on anthocyanin color at pH 3, whereas only a bathochromic effect at pH 1. Colorimetric calculation based on these curves has revealed the existence of reddening effect in these extracts.No significant spectral difference was observed between the petal extracts of red and black cultivars. This fact seems to indicate that the co-pigmentation is not involved in an expression of the black color in rose petals.In the extracts showing an obvious spectral shift, certain flavonoids, tannins and metallic elements (K, Na, Mg, Fe, Al) have been detected. It is likely that the spectral shift observed above is due not to flavonoids and catechol tannin, but chiefly to pyrogallol tannin." @default.
- W4230395075 created "2022-05-11" @default.
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- W4230395075 date "1968-01-01" @default.
- W4230395075 modified "2023-09-26" @default.
- W4230395075 title "Studies on the Expression of Color Tone in Rose Petals, VII" @default.
- W4230395075 doi "https://doi.org/10.15281/jplantres1887.81.377" @default.
- W4230395075 hasPublicationYear "1968" @default.
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