Results 171 to 180 of about 190,710 (211)
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DPPH Radical Scavenging Reaction of Hydroxy- and Methoxychalcones
Bioscience, Biotechnology, and Biochemistry, 2006The DPPH radical scavenging activity of 2',4',6'-trihydroxy- and 2'-hydroxy-4',6'-dimethoxychalcones carrying a 2,3- and 3,4-dihydroxylated, and 3,4,5-trihydroxylated B-ring was evaluated in alcoholic and non-alcoholic solvents. All test compounds scavenged more than two equivalent of radicals by a possible conversion to the corresponding B-ring ...
Jun, Nishida, Jun, Kawabata
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High-Throughput Relative DPPH Radical Scavenging Capacity Assay
Journal of Agricultural and Food Chemistry, 2006A high-throughput relative 2,2-diphenyl-1-picryhydrazyl (DPPH) radical scavenging capacity (RDSC) assay was developed and validated in the present study. This RDSC assay is easy to perform and has acceptable accuracy (90-110% recovery), precision [3.9-7.0% pooled relative standard deviation (RSD)], and reproducibility (2.2 and 3.5% interday and ...
Zhihong, Cheng +2 more
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X-ray Photoelectron Spectra of DPPH and Diphenylpicrylhydrazine
Nature Physical Science, 1971THE technique of X-ray photoelectron spectroscopy (ESCA) is already proving to be a valuable new tool for investigating a variety of problems in chemistry and physics. It entails direct measurement of the binding energies of electrons in the inner shells of the atoms in a molecule and the results have revealed the existence of a chemical shift1–3.
I Drummond, H Harker
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g-Tensor anisotropy of DPPH in DPPH2
Journal of Magnetic Resonance (1969), 1976The ESR spectra of polycrystalline samples of the free radical 2-2-diphenyl-1-picrylhydrazyl in dilute concentration in the hydrazine are studied to determine the anisotropy of the g-tensor and the orientation of its symmetry axis. A satisfactory fit to the experimental spectrum is obtained with the hyperfine tensors as given by Holmberg, Livingston ...
Joseph S Chalmers, Peter W France
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Adaptation of DPPH Method for Antioxidant Determination
ECS Transactions, 2011Antioxidants are indispensable molecules that help prevent biomolecule oxidation. By fighting the production of free radicals, antioxidants prevent different ageing-associated diseases. In this work, the method of 2,2-diphenyl-2-picrilhydracil (DPPH) is adapted to determine antioxidants in different cosmetic, nutritional, and biological samples using ...
Gisela I. Rodríguez Cid de León +5 more
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Low temperature magnetic properties of solid DPPH
Physica B+C, 1977Abstract Magnetic susceptibility measurements are performed on DPPH-benzene complex and solvent-free DPPH in a temperature range of 300-2.2 K and in a field range of 6–20 kOe. The experimental values are quite different in these two cases and a pair model with a singlet-triplet state is proposed.
P. Grobet +3 more
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E.S.R. of Irradiated DPPH Protected by Polystyrene
Journal of the Physical Society of Japan, 1961The number of electrons in diphenylpicryl hydrazl with polystyrene under gamma -irradiation was studied. It is shown from comparison of experimental and theoretical data that there is not only a shielding effect of polystyrene but also a protection mechanism.
Kohzoh Masuda, Tokuo Suita
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Određivanje antioksidativne aktivnosti flavonoida DPPH metodom
2007Ispitan je antioksidativni učinak flavonoida različite kemijske strukture. Primjenom DPPH metode testirana je i uspoređena antiradikalska sposobnost kvercetina, miricetina, apigenina i naringenina. Flavonoli kvercetin i miricetin pokazali su znatnu sposobnost hvatanja DPPH-radikala (IC50 = 1, 22 μ g/mL i 2, 5 μ g/mL), dok naringenin i ...
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Kinetika reakcija kvercetina i DPPH radikala
2022Kvercetin spada u podskupinu flavonola te mu se pripisuje niz bioloških učinaka: antioksidativni, antikarcinogeni, antialergijski, protuupalni i drugi. Reakcije flavonoida i DPPH• uobičajeno se prate tako što se mjeri smanjenje apsorbancije na valnoj duljini koja odgovara maksimumu DPPH•.
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