semiquinone


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semiquinone

[‚sem·ē·kwə′nōn]
(organic chemistry)
A radical ion intermediate formed in the oxidation of a hydroquinone to a quinone.
References in periodicals archive ?
CoQ10 may be found in three different forms in the biological tissues; oxide ubiquinone form (CoQ10), partially-reduced semiquinone form (free radical by-product) and fully-reduced ubiquinoal form Co(Q[H.
A second commonly studied antioxidant gene activated by Nrf2 is the quinone oxidoreductase gene (NQO1), which produces an enzyme that prevents semiquinone redox cycling and consequent oxidative stress.
There are three redox states of Coenzyme Q10: fully oxidized (ubiquinone), semiquinone (ubisemiquinone), and fully reduced (ubiquinol).
it was also observed that semiquinone and quinone radicals are involved in damage of DNA structure by discussed xenobiotics.
Cigarettes include a number of chemicals such as aldehydes phenols hydrocarbons nitric oxide (NO) and quinone and semiquinone radicals.
In this study, formation of semiquinone anion radical and EA autosensitized photooxidation reactions were examined.
Cigarette smoke contains substantive amounts of toxic oxidants and free radicals including reactive aldehyde, quinone, hydroquinone, semiquinone and superoxide (Cantin, 2010; Yao and Rahman, 2011), which trigger off multiple series of pro-inflammatory responses.
Ketones protect the brain from free oxygen damage by decreasing cerebral coenzyme Q10 semiquinone levels and stimulating hippocampal glutation peroxidase (42,43).
II] state and incorporate two semiquinone ligands [[Co.
With respect to human aging, the weak point of this otherwise elegant system lies in the formation of free radical semiquinone anion species (*[Q.
The dibenzoquinomethane compounds fuchsone and aurine are polarographically reducible, in neutral and alkaline solutions, in two single-electron steps via a semiquinone type intermediate (E1/2 [?