Abstract
Syzygium calophyllifolium fruits are among the important wild edibles used by the tribes of Western Ghats. However, this underutilized fruit remained unnoticed for its medicinal properties. Hence, the present study was undertaken to evaluate the antioxidant activity by DPPH·, ABTS·+, FRAP assays and antibacterial efficacy by well diffusion method. GC-MS and HPLC profiles of crude extract and column chromatographic fractions were also determined. The methanolic extract of fruit (MFE) showed high total phenolics, tannins and flavonoids. The faction H (FH) displayed significant antioxidant property in DPPH· (IC50 2.1µg/ml), ABTS·+ (19483.29μM Trolox equivalents/g extract) and FRAP (65.5mM Fe(II)/mg extract) assays over MFE. Moreover, FH also exhibited good antibacterial activity against Escherichia coli (32.0mm), Salmonella typhi (27.0mm), Staphylococcus aureus (27.3mm) at 100mg/ml concentration. GC-MS revealed 12 major compounds in MFE, HPLC analysis of MFE and FH depicted the presence of rutin and ellagic acid. This study suggested that FH could have high concentration of bioactive compounds like rutin and ellagic acid or its analogues compared to MFE which may be responsible for its strong antioxidant and antibacterial activity.
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