The purpose of this study was to examine the usefulness of electron paramagnetic resonance spectroscopy (EPR) to estimate zinc and copper ions biosorption from the environment by pigmented soil fungi Cladosporium cladosporioides. The existence of a low amount of pheomelanin, besides eumelanin, in C. cladosporioides samples was proved by the analysis of shape of their EPR spectra. Concentration of o-semiquinone free radicals in crude mycelium was 2.4x10(17) spin/g. Changes in free radicals system of C. cladosporioides cultured in the presence of Zn2+ and Cu2+ were analysed. Both magnetic and chemical interactions of zinc and copper ions with free radicals in C. cladosporioides melanin were found. Magnetically interacting diamagnetic Zn2+ ions increased the concentration of o-semiquinone free radicals in melanin existing in C. cladosporioides mycelium, whereas paramagnetic Cu2+ ions decreased this concentration. Chemical interactions of Zn2+ and Cu2+ ions decreased the free radical concentrations in C. cladosporioides melanin. Homogeneously distributed free radicals in C. cladosporioides melanin rise its activity in biosorption processes.

译文

这项研究的目的是检查电子顺磁共振波谱 (EPR) 估算有色土壤真菌Cladosporium cladosporioides对环境中锌和铜离子生物吸附的有用性。通过分析其EPR光谱的形状,证明了除真黑色素外,在枝孢菌素样品中还存在少量的pheomelanin。粗菌丝体中o-半醌自由基的浓度为2.4x10(17) spin/g。分析了在Zn2和Cu2存在下培养的枝孢杆菌自由基系统的变化。发现了枝孢杆菌黑色素中锌和铜离子与自由基的磁性和化学相互作用。磁性相互作用的抗磁性Zn2离子增加了C. cladosporioides菌丝体中存在的黑色素中o-半醌自由基的浓度,而顺磁性Cu2离子则降低了该浓度。Zn2和Cu2离子的化学相互作用降低了C. cladosporioides黑色素中的自由基浓度。黑色素C. cladosporioides中均匀分布的自由基增加了其在生物吸附过程中的活性。

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