Radical scavenging activity, evaluation

Jinno, J., Mori, H., Oshiro, Y., Kikuchi, T. and Sakurai, H. (1991). Evaluation of free radical scavenging activity of OPC-14117 by electron spin resonance technique. Free Rad. Res. Commun. 15, 223-230. 

Lavelli V, Hippeli S, Peri C and Elstner EF. 1999. Evaluation of radical scavenging activity of fresh and air-dried tomatoes by three model reactions. J Agric Food Chem 47(9) 3826—3831. 

Sanchez-Moreno C. 2002. Review Methods used to evaluate the free radical scavenging activity in foods and biological systems. Food Sci Technol Int 8(3) 121—137. 

Antioxidant capacity can be measured by several techniques, each of which has its own limitations. Antioxidant capacity of fruit juices and purees was evaluated by the DPPH method (which measures the radical-scavenging activity against a nonphysio-logical free radical), and treatment of these products with PEF or HHP resulted in losses... 

Radical scavenging activity. Green tea, evaluated using the l,l-diphenyl-2-picryl-hydrazyl radical, indicated that the galloyl... 

Sumanont Y, Murakami Y, Tohda M, Vajragupta O, Matsumoto K, Watanabe H. 2004. Evaluation of the nitric oxide radical scavenging activity of manganese complexes of curcumin and its derivative. Biol Pharm Bull 27 170-173. 

The free-radical-scavenging activity of compounds was evaluated in the TEAC and CL assays. The first measures the relative abiUty of antioxidant substances to scavenge the radical cation 2,2 -azinobis(3-ethylbenzothiozoline-6-sulfonate) (ABTS" ) as compared to a standard amount of the synthetic antioxidant Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid). The CL assay measures the inhibition of iodophenol-enhanced chemiluminescence by a horseradish peroxidase/perborate/luminol system. Trolox was used as the reference antioxidant. The results showed that xanthones exhibited free-radical-scavenging activity at potency levels comparable to those of reference antioxidant compounds quercetin and rutin, while the benzophenone and phloroglucinol type compoimds had more moderate activities [87]. 

Stable nitroxides, independent of the way of their formation, are traditionally considered as the prerequisite and the principal species of the free-radical scavenging activity of HAS [15,125]. More pathways and oxidants certainly participate in NO formation (Eq.15). The specificity of NO" generation via oxidation with ROOH may serve for a rapid evaluation of the weatherability of HAS doped crosslinked melamine and urethane acrylic copolymers [152,159]. 

Krishnamurthy [73] observed that garcinol had no antioxidative activity in lipid peroxidation. Yamaguchi et al. evaluated the chelating, antioxidative and radical scavenging activities of garcinol, demonstrating that it has a strong antioxidant activity [59,60],... 

Sanchez-Moreno, C. Review Methods used to evaluate the free radical scavenging activity in foods and biological systems Food Sci. Tech. Int. 8 (2002) 121-137. Shulaev, V. and D.J. Oliver Metabolic and proteomic markers for oxidative stress New tools for reactive oxygen species research Plant Physiol. (Special Issue on Reactive Oxygen Species), 141 (2006) 367-372. 

Several free radical scavenging activity tests (hydrogen peroxide, superoxide, and DPPH) have been employed to evaluate the extracts of hazelnut kernel and hazelnut by-products. This information... 

AUomargaritarine (284) can inhibit the Hpid peroxydation process (POL) triggered by either iron ions or feri-butyl hydroperoxide in a rat model. It also exhibited a Fe " " chelating capacity and a weak radical scavenging activity.A small library of C15-aminated securinine derivatives was prepared and evaluated for their antioxidant potential. Only allomargaritarine (284), 5-methoxy allomargaritarine (285), and pyridine derivative 287 showed interesting POL inhibition activities in iron-induced models (Scheme 53). In constrast, securinine (1) did not influence the POL. 

Four polysaccharide fractions (PAVF 1,11-a and III) were extracted from the fruit calyx of Physalis alkekengi var. francheti and their chemical compositions were determined. The crude polysaccharide fractions (FCPs) and all purified fractions (PAVF I, Il-a and III) were evaluated for their antioxidant activity by using hydroxyl radical assay (.OH), superoxide radical assay and DPPH assay. All tested compoxmds showed a dose-dependent radical-scavenging activity. Among all, PAVF I had the best scavenger activity on DPPH radical, hydroxyl radical and superoxide anion, and its activity was more pronounced than Vc used as the standard [116]. 

Sisodia et al. (2013) evaluated antioxidant activity for different extract of Ramalina roesleri species and found that the DPPH radical scavenging activity of extracts ranged from 29.42 to 87.90 %. Sharma et al. (2012) examined the antioxidant activity of two common hchens, namely, Parmotrema reticulatum and Usnea... 

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