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An EPR study into the effect of annealing on both the Mn 2+ and free radical signal in lentil
Author(s) -
Polat Mustafa,
Korkmaz Mustafa
Publication year - 2001
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1046/j.1365-2621.2001.t01-1-00462.x
Subject(s) - electron paramagnetic resonance , annealing (glass) , chemistry , atmospheric temperature range , analytical chemistry (journal) , spectral line , kinetics , radical , nuclear magnetic resonance , materials science , thermodynamics , metallurgy , chromatography , physics , organic chemistry , astronomy , quantum mechanics
The results of an EPR investigation on dry lentil (macrosperma) are reported in the present work. The EPR spectrum of lentil is composed of an equally spaced sextet and a single weak resonance line appearing at g=2.0050. Whole intact individual and decorticated seeds and testa were studied separately; however, ground lentil was used throughout the work to avoid any possible problems arising from the microwave cavity filling factor. Although intact and decorticated seeds were found to exhibit both Mn 2+ and radical signals, the testa exhibited only the radical signal. An increase and decrease of Mn 2+ and radical signals were observed, respectively, below room temperature. Above room temperature, they both decreased and these decreases were irreversible. The kinetics of these decreases were studied in detail over a temperature range of room–423 K by annealing samples at different temperatures for various times.