Über den Abbau von 4.2′.4′.6′-Tetrahydroxychalkon-2′-glucosid und 4.2′.4′-Trihydroxychalkon-4′-glucosid in Rotkohlkeimlingen und Petunien

Abstract

Both 4.2′.4′.6′-tetrahydroxychalcone-2′ - glucoside-[β-14C] (I) and 4.2′.4′-trihydroxychalcone-4′. glucoside-[β-14C] (II) are converted into cyanidin-[2-14C] in red cabbage seedlings, even though chalcone II does not possess the phloroglucinol-type pattern of substitution in ring A. Therefore the possibility that the incorporation of the chalcones proceeds via a degradation to p-coumaric acid was considered. After administration of II to red cabbage seedlings p-coumaric acid- [β-14C] could be isolated by means of dilution analysis, the location of the radioactivity being proved by degradation of the p-coumaric acid. After administration of I to Petunia hybrida radioactive p-coumaric acid and ferulic acid were isolated from the shoots and blossoms. It can be deduced from these results that the plants are able to split chalcones I and II - or the corresponding flavanones - between the carbonyl group and ring A.