hydroxyl radical


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.
Related to hydroxyl radical: superoxide anion, superoxide

hydroxyl radical:

see hydroxidehydroxide
, chemical compound that contains the hydroxyl (−OH) radical. The term refers especially to inorganic compounds. Organic compounds that have the hydroxyl radical as a functional group are called alcohols; the hydroxyl radical is also present in the carboxyl group
..... Click the link for more information.
.

hydroxyl radical

(hÿ-droks -ăl) The radical OH, consisting of an oxygen and hydrogen atom bound together. It was the first interstellar molecule to be detected (1963) in the radio region of the spectrum and is also associated with certain red and infrared stars (see OH/IR star; maser source). The spectral lines – OH lines – occur at 18, 6.3, 5.0, 3.7, and 2.2 cm.
References in periodicals archive ?
The addition of hydrogen peroxide (H2O2) increases the decolorization rate because of increased hydroxyl radical concentration in dye solution.
Hydroxyl radical can quickly capture the hydrogen atom of the C-H chain of polysaccharide and form [H.sub.2]O [43].
Pretreatment Lutein Zeaxanthin method ([micro]g/mL) ([micro]g/mL) No pretreatment 0.70 [+ or -] 1.76 [+ or -] 0.046 0.052 Freeze-thaw 9.83 [+ or -] 21.78 [+ or -] 0.683 pretreatments 0.451 Pretreatment DPPH radical scavenging ABTS radical scavenging method activity (%) activity (%) No pretreatment 8.36 [+ or -] 0.472 7.66 [+ or -] 0.38 Freeze-thaw 94.59 [+ or -] 0.569 75.42 [+ or -] 2.022 pretreatments Pretreatment Hydroxyl radical scavenging method activity (%) No pretreatment 4.76 [+ or -] 0.216 Freeze-thaw 55.38 [+ or -] 1.538 pretreatments
Hydroxyl radical is the most reactive chemical species known to induce oxidative damage to proteins, lipids, and DNA.
The scavenging rate on hydroxyl radicals was measured by the method of Smironff and Cumbes with slight modifications [24].
The mixtures were incubated at room temperature for 2h, and the DPPH and hydroxyl radical scavenging activities were measured.
Hydroxyl radicals (H[O.sup.*]) dominate at pH 11 in accordance with (4).
Chemical reactions involved in the action of ozone in water under UV irradiation are represented in equations 1 and 2 (Litter, 2005), including the photodecomposition of ozone in the presence of UVc, a process that generates [H.sub.2][O.sub.2] and hydroxyl radicals:
According to the data presented the extracts were able to protect phospholipids by scavenging hydroxyl radicals before the reaction of susceptible components within the lipid matrix.
"Oxidation of volatile organic compounds initiated by the hydroxyl radical, then catalyzed by nitrogen oxide--that's what makes ozone," says Jennifer Murphy, a chemistry professor at the University of Toronto.