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The photostabilities of luteolin, in solution, in the presence of aluminium ions, and deposited on a cellulosic substrate have been determined and compared with those of quercetin and other 5-hydroxyflavonols and their 3-O-glycosides.In aqueous methanol solution, luteolin and flavonol 3-glycosides exhibited no degradation over periods of up to 15h of UV irradiation. However, the flavonols studied...
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