Abstract
diffuse reflectance infrared spectroscopy (DRIFT) and elemental analysis were employed to monitor biodegradation of black gum wood (<i>Nyssa sylvatica</i>) during growth of the shiitake mushroom (<i>Lentinula edodes</i>). Black gum was decayed for up to 4.3 years by <i>L. edodes</i>, during which time it was sampled at 19, 31, and 52 months. Biodegraded woods displayed increased % O (w/w) and decreased % C (w/w) relative to the undecayed control. The DRIFT spectra of decayed black gum showed a decrease in relative intensity of absorption bands at 1735 cm<sup>-1</sup> assigned to carboxyl functional groups from xylans and an increase in the absorption band at 1640 cm<sup>-1</sup> assigned to conjugated carbonyl groups originating from lignin. Xylan decay was rapid initially but slowed after 19 months; however, oxidative decay of the lignin side chains occurred throughout the 52-month decay period. Overall elemental and DRIFT data show that both polysaccharides and lignin were decayed during cultivation of the edible white-rot fungus.
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