An EPR study into the effect of annealing on both the Mn2+ and free radical signal in lentil
2001
Polat, M. | Korkmaz, M.
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.
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