Chemical and biological potentialities of the ethyl acetate extracts of Drynaria quercifolia tuber and leaf

Abstract

The ethyl acetate extracts of Drynaria quercifolia tubers and leaves were studied for their chemical and biological potentialities. The tuber extract was enriched with more reducing power compared to the leaf extract. But, the phenolic content was higher in the leaf extract compared to the tuber extracts. However, both the extracts were comparably cytotoxic and showed broadspectrum antimicrobial activity. The antimicrobial compound in the tuber extract was nonpolar. The findings suggested that the ethyl acetate extracts of D. quercifolia may have active principles for the development of promising phytotherapeutics.
 Dhaka Univ. J. Biol. Sci. 24(2): 147-152, 2015 (July)

Antibacterial Activity and Physicochemical Properties of Florally Diversified Bangladeshi Honeys

“…The ascorbic acid content was determined by Bessel's titrimetric method using 2,6-dichlorophenol indophenol (Sigma, USA) as the dye and standard ascorbic acid 16 . Total phenolics content of the honey samples were measured as mg gallic acid equivalence using a previously described modified spectrophotometric Folin-Ciocalteu method 17 . Briefly, 200 µl of 1:1 diluted honey sample was mixed well with 1.8 ml distilled H 2 O and 200 µl Folin-Ciocalteaue phenol reagent (Scharlau, Spain).…”

“…Absorbance of the solution was taken at 750 nm using a spectrophotometer. The total antioxidant capacity was measured as mg ascorbic acid equivalence using the phosphomolybdenum method 17 . For this, a 0.1 ml aliquot of the diluted honey sample was shaken with 1 ml of phosphomolybdenum reagent solution (0.6 M sulfuric acid, 28 mM sodium phosphate and 4 mM ammonium molybdate in distilled water).…”