02458nas a2200229 4500008004100000245011000041210006900151260001900220300001200239490000600251520178800257653001202045653001402057653001702071653001502088653001002103100002202113700001902135700002202154700001702176856003502193 2017 eng d00aCharacterization and Distribution of Flavonoids from Flowers in Different Horticultural Types of Begonia.0 aCharacterization and Distribution of Flavonoids from Flowers in  cSeptember 2017 a850-8550 v93 a

Background: The begonias are ornamental plants known by the varied forms and colors of their flowers, as well as their decorative foliage. Objective: This study attempts to characterize the flavonoids isolated from flower extracts of different horticultural cultivars of the genus Begonia. Material and methods: The compounds of the ethyl acetate and aqueous extracts were separated by chromatographic methods and identified by UV spectra and chemical techniques. Results: The analysis allowed the characterization of flavonoids belonging to flavonol types in the free aglycones and glycoside forms of kaempferol and quercetin. On the other hand, fingerprinting analysis and quantification of major flavonoids of 184 cultivars were performed by high-performance liquid chromatography (HPLC). Among twenty five (25) components which were detected and separated: ten were corresponding to quercetin 3-Oglucosyl- rhamnoside (Rt=23.5), quercetin 3-O-glucoside (Rt=25), kaempferol 3-O-glucosylrhamnoside and its acylated derivative (Rt=32), kaempferol 3-O-glucoside (Rt=33), quercetin 3-O-p.coumaroyl-diglucoside (Rt=37), quercetin 3-O-P.coumaroyl-glucoside (Rt=40.5), quercetin (Rt=41.5), kaempferol and its acylated derivative (Rt=47). Only non-acylated glycosides of quercetin and kaempferol contributed to chemical variations among different cultivars based on the results of PCA. Conclusion: The genus Begonia is very heterogeneous and it is possible to distinguish several chemotypes whose differences rely on the complementarities between the metabolic pathways involved in the biosynthesis of glycosides of quercetin and kaempferol.

10aBegonia10aChemotype10aDistribution10aFlavonoids10aHPLC.1 aKarima, Saffidine1 aNadine, Chirol1 aFadila, Benayache1 aMaurice, Jay uhttp://fulltxt.org/article/186