Hesperetin 7-O-glucoside and prunin in Citrus species (C. aurantium and C. paradisi). A study of their quantitative distribution in immature fruits and as immediate precursors of neohesperidin and naringin in C. aurantium
1993
Castillo, J. | Benavente, O. | Rio, J.A. del
The flavanone glucosides prunin (naringenin 7-O-glucoside) and hesperetin 7-O-glucoside were isolated and identified in the immature fruits of Citrus aurantium. Only prunin was identified in Citrus paradisi. This is the first study concerned with the isolation of hesperetin 7-O-glucoside from Citrus tissues and with the quantitative distribution of both flavanone glucosides during the development of C. aurantium fruits. Both reach maximum concentration during the first stages of growth, gradually decreasing until the fruits reach maximum development. The total content per fruit of both glucosides is at its greatest at the end of the logarithmic phase of fruit development. The total content per fruit falls sharply when the corresponding neohesperidosides, naringin and neohesperidin, the most abundant flavanone glycosides in C. aurantium, reach their maximum levels. These data and the demonstration of the capacity of glucosyltransferase from cell-free extracts of C. aurantium tissues to glucosylate naringenin and hesperetin suggest that prunin and hesperetin 7-O-glucoside are direct precursors of naringin and neohesperidin, respectively, in C. aurantium.
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