[期刊论文][Paper]


Decomposition kinetics of peroxynitrite: influence of pH and buffer

作   者:
Christian Molina;Reinhard Kissner;Willem H. Koppenol;

出版年:2013

页    码:9898 - 9898
出版社:Royal Society of Chemistry (RSC)


摘   要:

  The decay of ONOOH near neutral pH has been examined as a function of isomerization to H+ and NO3, and decomposition to NO2 and O2via O2NOO. We find that in phosphate buffer kisomerization = 1.11 ± 0.01 s−1 and kdisproportionation = (1.3 ± 0.1) × 103 M−1 s−1 at 25 °C and I = 0.2 M. In the presence of 0.1 M tris(hydroxymethyl)aminomethane (Tris), the decay proceeds more rapidly: kdisproportionation = 9 × 103 M−1 s−1. The measured first half-life of the absorbance of peroxynitrite correlates with [Tris]0·([ONOO]0 + [ONOOH]0)2, where the subscript 0 indicates initial concentrations; if this function exceeds 6.3 × 10−12 M3, then Tris significantly accelerates the decomposition of peroxynitrite.



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所属期刊
Dalton Transactions
ISSN: 1477-9226
来自:Royal Society of Chemistry (RSC)