Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins.

Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins. Research Abstract Details 

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Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins. Abstract Text:

K Clarke,R Edge,V Johnson,E J Land,S Navaratnam,T G Truscott,

We report the direct observation of the quenching of the weakly absorbing transient due to the amino radical by oxygen and, hence determine, by a totally direct method, the corresponding rate constant (k = (1.1 +/- 0.1) x 109 dm3 mol-1 s-1). We also report the rate constants for the reactions of the amino radical with several amino acids and models of black eumelanin and blond/red phaeomelanin. These reactions lead to a mechanism, based on free radicals, that can explain why ammonia is useful in commercial hair (melanin) bleaching, avoiding excessive amino acid (hair protein) damage.

Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins. Publishing Authors By Initials

K Clarke,R Edge,V Johnson,EJ Land,S Navaratnam,TG Truscott,

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Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The journal of physical chemistry. A

VOLUME: 112

Page Numbers: 1234-7

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ISSN: 1089-5639

DAY: 24

MONTH: 01

YEAR: 2008

Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins. Information

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LANGUAGE: eng

NlmUniqueID: 9890903

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Grant and Affiliation Information for Direct Observation of NH(2)(*) Reactions with Oxygen, Amino Acids, and Melanins.

AFFILIATION: Chemistry Section, School of Physical and Geographical Sciences, Keele University, Staffs ST5 5BG, U.K., STFC Daresbury Laboratory, Daresbury, WA4 4AD, U.K., and BioScience Research Institute, Peel Building, University of Salford, Salford M5, 4WT, U.K.

Country: United States

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MEDLINETA: J Phys Chem A

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