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Herrmann H Fillol JL Wadepohl H Gade LH 《Angewandte Chemie (International ed. in English)》2007,46(44):8426-8430
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The biological and toxicological effects that have been attributed to reactive nitrogen species (RNS) are increasingly stirring
the scientific inquisitiveness about the molecular mechanisms involved. However, RNS present some characteristics that complicate
their detection, namely their short lifetime and the normal presence of a variety of endogenous compounds capable of reacting
with these reactive species, when the studies are performed in biological matrices. The development of methodologies capable
of circumvent these difficulties is thus of fundamental importance. Fluorescence probes are particularly important due to
their high sensibility and usefulness in temporal and spatial monitoring of RNS, particularly in microanalysis conditions
in biological media akin to cells or tissues. In the present review is given an account of the fluorescence probes that have
been used for detection of nitric oxide (⋅NO), peroxynitrite anion (ONOO−), as well as of some of its derivatives in biological and nonbiological media. 相似文献
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Tatiana Y. Karogodina Igor G. Dranov Dr. Svetlana V. Sergeeva Dr. Dmitry V. Stass Prof. Dr. Ulrich E. Steiner 《Chemphyschem》2011,12(9):1714-1728
Oxidation of dihydrorhodamine 123 (DHR) to rhodamine 123 (RH) by oxoperoxonitrite (ONOO?), formed through recombination of NO and O2.? radicals resulting from thermal decomposition of 3‐morpholinosydnonimine (SIN‐1) in buffered aerated aqueous solution at pH 7.6, represents a kinetic model system of the reactivity of NO and O2.? in biochemical systems. A magnetic‐field effect (MFE) on the yield of RH detected in this system is explored in the full range of fields between 0 and 18 T. It is found to increase in a nearly linear fashion up to a value of 5.5±1.6 % at 18 T and 23 °C (3.1±0.7 % at 40 °C). A theoretical framework to analyze the MFE in terms of the magnetic‐field‐enhanced recombination rate constant krec of NO and O2.? due to magnetic mixing of T0 and S spin states of the radical pair by the Δg mechanism is developed, including estimation of magnetic properties (g tensor and spin relaxation times) of NO and O2.? in aqueous solution, and calculation of the MFE on krec using the theoretical formalism of Gorelik at al. The factor with which the MFE on krec is translated to the MFE on the yield of ONOO? and RH is derived for various kinetic scenarios representing possible sink channels for NO and O2.?. With reasonable assumptions for the values of some unknown kinetic parameters, the theoretical predictions account well for the observed MFE. 相似文献
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