In vitroAntioxidant Activity of Different Cultivars of Banana Flower (Musa paradicicusL.) Extracts Available in India

Six different cultivars of banana flowers (Musa paradicicus) (Kathali, Bichi, Shingapuri, Kacha, Champa, and Kalabou) were analyzed for the content of polyphenol expressed as gallic acid equivalent and flavonoid expressed as quercetein equivalent, and thein vitrototal antioxidative activities of the flower extracts were compared with standard and expressed as trolox equivalent. The reducing power, 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2-azinobis(3-ethylbenzothiazoline-6-sulfo nic acid) radical cation (ABTS times +) scavenging activities, inhibition of lipid peroxidation in a linoleic acid emulsion system, and liposome peroxidation system were measured and compared with respective standard antioxidants. Iron-mediated Fenton reaction was carried out to evaluate the protective effect of the extract of banana flower (Kacha cultivar) against H2O2-induced DNA damage. The Kacha variety contains the maximum amount of polyphenol (11.94 +/- 0.03 mg of gallic acid equivalent/g of dry weight) and flavonoid (0.174 +/- 0.001 g of quercetin equivalent/g of polyphenol). It also has the highest total antioxidant capacity, DPPH radical scavenging activity, and ABTS times + radical scavenging activity with a least EC50 value of 0.051 mg/mL. Hepatic cell damage in iron-mediated Fenton reaction caused by free radicals is reduced by the banana flower extract. On the basis of the results obtained, the banana flowers are found to be a potential source of natural antioxidants. This is the first report on the antioxidant properties of the extracts from banana flowers. The study suggests that the flowers ofM. paradicicusthat are found in India and consumed as vegetable can provide valuable functional ingredients that help in the prevention of oxidative stress.