Accessibility of hydroxyl groups of brown-rot degraded spruce wood to heavy water

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Abstract

The accessibility of alcoholic and phenolic hydroxyl (O-H) groups in non-degraded and brown-rot degraded spruce wood (Piceas abies L. Karst.) was investigated with Fourier transform near infrared (FT-NIR) transmission spectroscopy in combination with deuterium exchange with heavy water (D 2O). In the presence of excess D2O, accessible O-H groups were converted into O-D groups and characteristic O-H first overtone bands disappeared in the FT-NIR spectra. Hydroxyl groups of cellulose Ia were more accessible than those of cellulose I ß . O-H groups of wood degraded by brown-rot fungi showed much lower overall accessibility, and free O-H groups from amorphous matrix polysaccharides, preferentially those located in primary and outer secondary cell walls and middle lamellae were least accessible, whereas H-bonded O-H groups associated with cellulose microfibrils showed residual accessibility in brown-rotted wood of incipient, early and pronounced degradation stages. © IM Publications LLP 2011.

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Fackler, K., & Schwanninger, M. (2011). Accessibility of hydroxyl groups of brown-rot degraded spruce wood to heavy water. Journal of Near Infrared Spectroscopy, 19(5), 359–368. https://doi.org/10.1255/jnirs.943

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