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Effect of pH on Paramagnetic Centers in Cladosporium cladosporioides Melanin

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Pilawa B., Buszman E., Gondzik A., Wilczyński S., Zdybel M., Witoszyńska T., Wilczok T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 1
147-150
EN
Paramagnetic centers in melanin existing in pigmented soil fungi Cladosporium cladosporioides cultured at acidic (4, 5, 6), neutral (7), and alkaline (8) pH were studied by EPR method. o-semiquinone free radicals (g: 2.0032-2.0040) concentration in melanin biopolymer increased for pH from 4 to 6, decreased at pH 7, and reached the maximum value at pH 8. It may be expected that melanin free radicals reactions with small molecules (metal ions, drugs) are the most effective at pH between 6 and 8. Slow spin-lattice relaxation processes exist in the all studied melanin samples.
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