Resumo

VARGAS-ALVAREZ, Dolores et al. Kinetics of accumulation and distribution of flavonoids in guava (Psidium guajava L.). Agrociencia [online]. 2006, vol.40, n.1, pp.109-115. ISSN 2521-9766.

The objective of this work was to identify three flavonols (myricetin, quercetin, and kaempferol) and two flavones (luteolin and apigenin) in bark, immature, mature and senescent leaves, floral buds, flowers and fruits of guava (Psidium guajava L.). Floral bud had the highest concentration of quercetin (2036 mg kg−1), followed by mature leaf (1236 mg kg−1). The five compounds were found in fruit in lower concentrations. The evaluation of fruit and leaf to identify phenological stage with higher flavonoids concentration, was derived from this study. Of the three stages of fruit, the first stage of bud had the highest concentrations of myricetin (255.8 mg kg−1), quercetin (3604.7 mg kg−1), luteolin (229.1 mg kg−1), kaempferol (229.1 mg kg−1) and apigenin (251.6 mg kg−1). In mature leaves, the greatest concentrations were found in July: myricetin (208.44 mg kg−1), quercetin (2883.08 mg kg−1), luteolin (51.22 mg kg−1) and kaempferol (97.25 mg kg−1).

Palavras-chave : Psidium guajava; bark; flavonoids; fruit; leaf; floral bud.

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