Resumo

PUERTAS MEJIA, Miguel A; TOBON GALLEGO, Julián  e  ARANGO, Víctor. Kalanchoe daigremontiana Raym.-Hamet. & H. and its potential use as a source of natural antioxidants and colorants. Rev Cubana Plant Med [online]. 2014, vol.19, n.1, pp. 61-68. ISSN 1028-4796.

Introduction: little information is available on the antioxidant capacity of the species Kalanchoe daigremontiana Raym.-Hamet. & H. However, its widespread use in traditional medicine points to its potential as a source of bioactive substances with antioxidant properties. Objective: evaluate the antioxidant potential of extracts from Kalanchoe daigremontiana leaves and flowers. Methods: leaf and flower extracts were obtained in acidulated methanol (HCl 10 % v/v), and their antioxidant capacity was gauged by DPPH and ABTS radical cation assay and total anthocyanin content determination. Results: both leaf and flower extracts displayed promising antioxidant potential (EC₅₀= 4.2-4.4 g extract/mmol DPPH; 1.71-2.05 mmol Trolox/kg extract). Determination was also made of the presence of anthocyanins delphinidin, cyanidin and pelargonidin in the flowers. Conclusions: Kalanchoe drageimontiana leaves and flowers displayed significant antioxidant capacity, comparable to that of ascorbic acid. The presence of delphinidin-3-O-glucoside, cyanidin-3-O-glucoside and pelargonidin-3-O-glucoside was tentatively identified in the flower extract. Therefore, the study species may be used as a source of bioactive substances for use as additives in the food, cosmetic or pharmaceutical industry.

Palavras-chave : natural antioxidants; anthocyanins; Briofillum daigremontiana; Kalanchoe daigremontiana; Kalanchoe madagascar; total anthocyanin content.

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