Results 211 to 220 of about 70,745 (263)

DPPH antioxidant assay revisited

Food Chemistry, 2009
Abstract Scavenging of DPPH free radical is the basis of a common antioxidant assay. A number of protocols have been followed for this assay resulting in variation in the results of different laboratories. We present a perspective of the protocols followed by different workers with incongruity in their results and recommend a standard procedure ...
Om P. Sharma, Tej K. Bhat
exaly   +2 more sources

Use of DPPH⋅|DPPH Redox Couple for Biamperometric Determination of Antioxidant Activity

Electroanalysis, 2005
AbstractA novel electrochemical method for selective determination of antioxidant activity based on 2,2‐diphenyl‐1‐picrylhydrazyl | 2,2‐diphenyl‐1‐picrylhydrazin (DPPH⋅|DPPH) redox couple and biamperometric technique is proposed. Two identical glassy carbon disk electrodes were mounted in a classic electrochemical cell and the tested working potential ...
Stjepan Milardovic, Damir Iveković, Vlatko Rumenjak, Božidar S. Grabarić   +3 more
openaire   +3 more sources

The effects of DPPH on cochlear microcirculation

Current Medical Science, 2003
To investigate the effects of free radical, 1, 1-Diphenyl-2-picylhydrazyl(DPPH), on cochlear blood flow.Twenty guinea pigs were divided into 3 groups at random, 6 for control group, 6 for 1 mmol/L of DPPH group and 8 for 0.1 mmol/L of DPPH group. 2 microliters vehicle or drugs were dropped into round window membrane.
Weijia, Kong, Min, Chen
openaire   +3 more sources

E.P.R. in neutron-irradiated DPPH

Physica, 1966
Abstract The influence of neutron irradiation of D.P.P.H., as measured by paramagnetic resonance at low temperatures is reported. The observed effects include a considerable increase in the number of spins and in the linewidth and a small but significant change in g -values.
A. Van Itterbeek, J. Witters, R. Van Audekercke, J. Nihoul   +3 more
openaire   +1 more source

Magnetic interactions in solvent-free DPPH

Journal of Magnetism and Magnetic Materials, 1983
Abstract Susceptibility and ESR measurements are performed on single crystals of solvent-free 2,2-diphenyl-l-picrylhydrazyl (DPPH) between 1.5 and 300 K. The susceptibility measurements are explained by a pair model but 4% nonpairing paramagnetic centres are observed at low temperatures. These centres probe the dynamics of the spin system and the ESR
J. Burg, P. Grobet
openaire   +1 more source

ESR.‐Spektrum von Diphenylpicrylhydrazyl (DPPH)

Helvetica Chimica Acta, 1968
AbstractThe ESR. sprectra of DPPH in mixed organic solvents have been measured with a K‐band superheterodyne spectrometer and self‐locking magnetometer with high precision. Approximately 150 lines have been resolved in the spectra. Both the zero and first order derivative spectra were analyzed by a line shape analysis program for determination of the ...
Z. Haniotis, Hs. H. Günthard
openaire   +1 more source