Chitosan (CS) is an abundant and renewable polysaccharide that is reported to exhibit a great variety of beneficial properties. However, the poor solubility of chitosan in water limits its applications. In this paper, we successfully synthesized single N-quaternized (QCS) and double N-diquaternized (DQCS) chitosan derivatives, and the resulting quaternized materials were water-soluble. The degr...

OBJECTIVES The present study was aimed to investigate the α-amylase inhibition and antioxidant activities of methanolic extract of Amaranthus caudatus Linn (MeAc). METHODS Methanolic extract of Amaranthus caudatus was screened for α-amylase inhibition activity by CNPG3 method (2-chloro-p-nitrophenyl-α-D-maltotrioside) and antioxidant activity was evaluated by 1,1-diphenyl-2-picryl-hydrazile (...

Scopoletin is a coumarin and a major component of Aegle Marmelos. In the present study, we determined the antioxidant activity of Scopoletin by employing various in vitro antioxidant assay such as 1, 1-diphenyl-2-picrul-hydrazil free radical (DPPH) scavenging, Hydrogen peroxide scavenging, superoxide radical scavenging, Hydroxyl radical scavenging activity and ferrous ion chelating activity by ...

objective: the present study was an attempt to study total phenolic content and antioxidant property of the crude ethanolic extract of the roots of azadirachta indica (a. indica). materials and methods: to evaluate the antioxidant properties of the crude extract, some complementary test systems, namely dpph free radical scavenging assay, reducing power assay, and ferrous ion chelating ability a...

in the present study, free-radical-scavenging and antioxidant activities of angipars™, an herbal extract which has been registered as a therapeutic drug for diabetic foot ulcer, were examined. we investigated the protective effect of angipars™ on cytotoxicity produced by exposure to h2o2 (300 µm) in hepg2 and a549 cell lines, using mtt assay, glutathione (gsh) content analysis, and lipid peroxi...

total phenolic contents (tpc) of five different extracts (petroleum ether, dichloromethane, ethyl acetate, ethanol and ethanol-water) of artemisia biennis willd were measured in this work. the antioxidant activity was investigated by three different methods: β-carotene bleaching (bcb) test, 2,2-diphenyl-1-picrylhydrazyl (dpph) radical scavenging method and ferrous ion chelating (fic) assay. amo...

Background: Naringenin is a bioactive flavonoid found in grapes and citrus fruits including tangelo, blood orange, lemons, and tangerines. The aims of this study were to investigate the ability of naringenin to scavenge free radicals and determine its ability to protect animals from streptozotocin (STZ) -induced liver damage. Methods: The free radical-scavenging activity of naringenin was ev...

The present work is carried out to study the antioxidant potential of ethanolic extract of Alstonia scholaris Linn. ( Apocynaceae ) using various in vitro tests including 1,1-diphenyl-2-picryl-hydrazil (DPPH . ) free radical scavenging, metal ion chelating, hydrogen peroxide scavenging, superoxide anion radical scavenging, and ferric thiocyanate reducing ability.   Ethanolic ex...

Hydroxybenzylidene hydrazines exhibit a wide spectrum of biological activities. Here, we report synthesis and free radical scavenging activity of nine new N-(hydroxybenzylidene)-N'-[2,6-dinitro-4-(trifluoromethyl)]phenylhydrazines. The chemical structures of these compounds were confirmed by 1H-NMR, 13C-NMR, 19F-NMR, IR spectroscopy, LC-MS, and elemental analysis. The prepared compounds were te...