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Extraction of pollen of Nothofagus antarctica with acid hydrolysis yields kaempferol, quercetin, the rare flavonol sexangularetin, and naringenin. The tetrahydroxy-chalcone isosalipurpol is shown for the first time to occur in such high amount as free aglycone in mature pollen; it yields naringenin in usual extraction procedures. The bright yellow coloration of the pollen is due to the presence of isosalipurpol and sexangularetin.

On the Pigmentation of the Pollen of Nothofagus antarctica (Forst.) Oerst. (Fagaceae)