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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Free+Radic+Res 2015 ; 49 (8): 919-26 Nephropedia Template TP
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Redox properties of the nitronyl nitroxide antioxidants studied via their reactions with nitroxyl (HNO) and ferrocyanide #MMPMID25789760
Bobko AA; Khramtsov VV
Free Radic Res 2015[]; 49 (8): 919-26 PMID25789760show ga
Nitronyl nitroxides (NNs) are the paramagnetic probes that capable of scavenging physiologically relevant reactive oxygen (ROS) and nitrogen (RNS) species, namely superoxide, nitric oxide (NO) and nitroxyl (HNO). NNs are increasingly considered as potent antioxidants and potential therapeutic agents. Understanding redox chemistry of the NNs is important for their use as antioxidants and as paramagnetic probes for discriminative detection of NO and HNO by electron paramagnetic resonance (EPR) spectroscopy. Here we investigated the redox properties of the two most commonly used NNs, including determination of the equilibrium and rate constants of their reduction by HNO and ferrocyanide, and reduction potential of the couple NN/hydroxylamine of NN (hNN). The rate constants of the reaction of the NNs with HNO were found to be equal to (1-2)×104 M-1s-1 being close to the rate constants of scavenging superoxide and NO by NNs. The reduction potential of the NNs and iminonitroxides (INs, product of NNs reaction with NO) were calculated based on their reaction constants with ferrocyanide. The obtained values of the reduction potential for NN/hNN ( E0??285mV) and IN/hIN ( E0??495mV) are close to the corresponding values for vitamin c and vitamin e, correspondingly. The ?balanced? scavenging rates of the NNs towards superoxide, NO and HNO, and their low reduction potential being thermodynamically close to the bottom of the pecking order of oxidizing radicals, might be important factors contributing into their antioxidant activity.