Please use this identifier to cite or link to this item: https://doi.org/10.1021/jf034787z
Title: Use of nitroxide spin probes and electron paramagnetic resonance for assessing reducing power of beer. Role of SH groups
Authors: Kocherginsky, N.M. 
Kostetski, Y.Yu. 
Smirnov, A.I.
Keywords: Antioxidant pool
Beer
EPR
Nitroxides
Reducing power
Spin traps
Issue Date: 23-Feb-2005
Source: Kocherginsky, N.M., Kostetski, Y.Yu., Smirnov, A.I. (2005-02-23). Use of nitroxide spin probes and electron paramagnetic resonance for assessing reducing power of beer. Role of SH groups. Journal of Agricultural and Food Chemistry 53 (4) : 1052-1057. ScholarBank@NUS Repository. https://doi.org/10.1021/jf034787z
Abstract: Intensity of EPR spectra of stable organic free radicals, nitroxides, is decreasing with time if the radicals are dissolved in beer. The process is determined by a chemical reaction of nitroxide reduction by components naturally present in beer. Kinetics can be described as a simple irreversible first order with respect to both nitroxide and one reducing agent. Effective concentration of the reducing agent and the corresponding reaction rate constant has been determined. It is demonstrated that the nitroxide reduction is sensitive to the presence of solvent-accessible SH groups of proteins present in beer. It is proposed that quantitative analysis of reduction kinetics of small water-soluble nitroxide radicals such as TEMPO and TEMPOL can be used to assess the reducing power of beer. The effect of accelerated aging of beer achieved at elevated temperatures on nitroxide reduction kinetics is demonstrated.
Source Title: Journal of Agricultural and Food Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/51827
ISSN: 00218561
DOI: 10.1021/jf034787z
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

14
checked on Dec 13, 2017

WEB OF SCIENCETM
Citations

14
checked on Nov 15, 2017

Page view(s)

35
checked on Dec 16, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.