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Antioxidant capacity of crude extract and fractions from Woodfordia fruticosa flower
Bhatt, Lok Ranjan,Baek, Seung-Hwa Kyung Hee Oriental Medicine Research Center 2007 Oriental pharmacy and experimental medicine Vol.7 No.2
Woodfordia fruticosa Kurz. (Lythraceae), commonly known as Dhayero, is used in the treatment of various ailments in Nepal. In this study, the antioxidant capacity of crude extract and different polarity fractions of Woodfordia fruticosa flowers were assayed for their scavenging abilities against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and nitric oxide radicals, competitive ${\beta}$-carotene bleaching, reducing power, metal chelating ability and total phenolic content. Crude extract and polar fractions showed stronger antioxidant capacity and contained very high level of total phenolics. They exhibited strong DPPH radical scavenging, nitric oxide scavenging and reducing power, medium ${\beta}$-carotene bleaching and poor metal chelating capacity. Positive correlation obtained between total phenolic content and antioxidant capacity assays, indicated the contribution of phenolics toards antioxidant capacity.
Antimicrobial Activity of Korean Medicinal Plants and Herbal Formulations
Bhatt, Lok-Ranjan,Woo, Shin-Sun,Yu, Byung-Soo,Baek, Seung-Hwa The Physiological Society of Korean Medicine and T 2007 동의생리병리학회지 Vol.21 No.3
In this study, we screened twenty four extracts of eight medicinal plants and three extracts of the commercial product for their antimicrobial and antioxidant properties. Ethanol and ethyl acetate extracts were found active where as aqueous extracts were little or no active. Extracts of Sophora flavescens, Salvia miltlorrhiza and Glycyrrhiza uralensis showed strong activity againsttested organisms and could be the potential antimicrobial agent. The increase of antimicrobial and antioxidant activities of formulations might be due to synergic effect. The results also indicated that the activity of bamboo salt and herbal products can be enhanced by making appropriate formulations.
Radical Scavenging Activity of Gallic Acid from Woodfordia Fruticosa Flowers
Bhatt, Lok Ranjan,Yook, Chan-Nam,Choi, Hwa-Jung,Baek, Seung-Hwa The Physiological Society of Korean Medicine and T 2008 동의생리병리학회지 Vol.22 No.4
Woodfordia fruticosa Kurz (Lythraceae) is used in the treatment of various ailments in traditional medicines. DPPH activity guided fractionation and purification process was used to identify the free radical-scavenging components from the flowers of this plant. The methanolic extract of the plant was first fractionated into four extracts; namely, n-hexane, chloroform, ethyl acetate and water fractions. Among them, the ethyl acetate fraction was found to be the most effective and was further subjected to activity guided-fractionation and isolation procedures. After successive column chromatography on silica gel and Sephadex LH-20, gallic acid, which is responsible for the radical scavenging activity, was isolated and its structure was elucidated by spectral methods ($^1H$ NMR, $^{13}C$ NMR) and by comparison with literature.
Free Radical Scavenging Activity and Kinetic Behaviorof Essential Oil from Artemisia vulgaris
Bhatt, Lok Ranjan,Kang, Jeong-Il,Baek, Seung-Hwa The Physiological Society of Korean Medicine and T 2007 동의생리병리학회지 Vol.21 No.2
The radical scavenging activity of Artemisia vulgaris essential oil was evaluated by 1,1-diphenyl-2-picrylhydrazyl(DPPH) assay in this study. Essential oil exhibited a significant free radical scavenging activity, with the highest activity at 15 ${\mu}$L/mL concentration. The reaction rate was slow and concentration-dependent
Antiradical activity of Azadirachta indica extracts and fractions
Bhatt, Lok Ranjan,Choi, Hwa-Jung,Baek, Seung-Hwa Kyung Hee Oriental Medicine Research Center 2008 Oriental pharmacy and experimental medicine Vol.8 No.1
In present study, total phenolic content of crude extract and antiradical activity of crude extract and different solvent fractions of Azadirachta indica were evaluated. Crude extract and most of the polar fractions showed higher radical scavenging activity. Among the crude extract and nine different fractions, the aqueous/methanol (3:1) fraction showed the highest activity.
Antimicrobial and Antiradical Activity of Nepalese Medicinal Plants
Bhatt, Lok Ranjan,Lim, Jin-A,Lim, Chi-Hwan,Baek, Seung-Hwa The Physiological Society of Korean Medicine and T 2007 동의생리병리학회지 Vol.21 No.6
In this study fourteen ethanol extracts from Nepalese medicinal plants were screened for their in vitro antimicrobial and antiradical activity and their total phenolic content was evaluated. The antiradicalactivity was evaluated by free radical scavenging assay, using 2,2-diphenyl-1-picryl hydrazyl radical (DPPH). Plant extracts showed a wide range of radical scavenging activity, with $IC_50$ value ranging in between $5.38\; {\mu}g/\;mL$ - $429.61\;{\mu}g/mL$. Strong radical scavenging activity was shown by flower extract of Woodfordia fruticosa ($5.38\;{\mu}g/\;mL$) and stem bark extract of Azadirachta indica ($5.58 {\mu}g/\;mL$)that also contained high phenolic content. Most of the sample showed activity below the concentration of $100\; {\mu}g/mL$. For antimicrobial activity three test microorganisms namely Staphylococcus aureus, Streptococcus epidermidis, and Candida albicans were used. The minimum inhibitory concentration (MIC) of the plant extracts was determined. Most of the plant extracts were effective against bacterial strains only at higher concentration ($800\;-\;1,600\;{\mu}g/mL$) but none of these were effective against Candida albicans below $1,600\;{\mu}g/mL$.