Effect of catechins and tannins on hydroxyl radical formation in depleted uranium-hydrogen peroxide systems

Nakajima, Akira; Matsuda, Emiko; Ueda, Yuto

doi:10.1007/s10967-009-0133-4

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…We have previously shown that tannins could be classified as hydrolyzable or condensed. 28) No clear difference in the hydroxyl-radical-eliminating ability was apparent in the tannin group.…”

Section: Resultsmentioning

confidence: 92%

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Ability of Water-Soluble Biosubstances to Eliminate Hydroxyl and Superoxide Radicals Examined by Spin-Trapping ESR Measurements: Two-Dimensional Presentation of Antioxidative Ability

Nakajima

Sakurai

Matsuda

et al. 2013

Bioscience, Biotechnology, and Biochemistry

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The hydroxyl- and superoxide-radical-eliminating ability of water-soluble biosubstances was examined by ESR combined with the spin-trapping method, indicating a median inhibitory dose, ID(h)(50) (mM) and id(h)(50) (mg/mL) for the hydroxyl radical, and ID(s)(50) (mM) and id(s)(50) (mg/mL) for the superoxide radical. Both the 1/[ID(h)(50) (mM)] and 1/[ID(s)(50) (mM)] values of selected biosubstances were linearly related to the second-order rate constant, k(2) (M(-1) s(-1)), defined for the reaction between biosubstances and the radicals in a logarithmic presentation. The result indicates that ID(h)(50) (mM) and ID(s)(50) (mM) are suitable parameters for both types of radical-eliminating ability. The obtained results are depicted two-dimensionally, taking id(h)(50) (mg/mL) as the abscissa and id(s)(50) (mg/mL) as the ordinate in the ROS inhibitory diagram. The biosubstances tested were assigned to five separate areas characterized by their functional groups on the diagram. The obtained ROS inhibitory diagram indicates the possibility for screening appropriate antioxidants.

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Section: Resultsmentioning

confidence: 92%

“…The smallest id s 50 (mg/mL) value for gallic acid supports the higher superoxideradical-eliminating ability of tannins. MMT had higher reducing ability, 28) resulting in the superoxide-radical elimination.…”

Section: Superoxide-radical-eliminating Ability Of the Biosubstancesmentioning

confidence: 96%