真菌性变色木材的ESR研究

THE ESR STUDIES OF FUNGUS STAINED WOOD

本文对霉菌和蓝变菌侵染木材所引起的变色作了ESR研究。结果表明变色木材的色素来自真菌的色素基团,具有很强的和稳定的E8R信号,并会淹没木材的其他自由基信号,g值为2.0040±0.0002,属于洛仑兹线型和均匀增宽线型。这种色素与自由基含量之间有相关性,并同蛋白质相缔合。这种色素具有生物黑色素的所有特征。因此木材受霉菌和蓝变菌侵染而变黑是由真菌分泌的黑色素所产生。

The Electron spin Resonances of the stained wood infected by mold and blue-stain fungi were investigated. The results revoaled that pigments in the stained wood were originated from pigment radicals of fungi displaying very strong and stable ESR signals with g=2.0040±0.0002. They drowned signals of other free radicals originated from the same piece of wood. Their line shapes are lorentzian and homogeneously brodened. The pigmentations are correlated with free radical contents in both stained wood and fungi associated with proteins. These pigments have all the characteristics of biological melanins. Therefore the stains in wood infected by mold and blue-stain fungi were supposed to be due to the presence of melanins secreted by these fungi.