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Title: Properties of Cellulose Degraded by the Brown-Rot Fungus, Postia plancenta

Source: The International Research Group on Wood Preservation, Document No.: IRG/WP/1350. 1988.

Author(s)Highley, Terry L.; Ibach, Rebecca; Kirk, T.Kent

Publication Year: 1988  View PDF »

Category: Not Classified

Abstract: To gain further understanding of the nature of the cellulose depolymerizing agent or agents of brown-rot fungi, brown-rotted cellulose was chemically and physically characterized. Various culture conditions, such as low nitrogen and elevated oxygen levels, did not induce degradation of cellulose by Postia placenta in liquid cultures. Therefore, brown-rotted cellulose for analysis was prepared by a nonliquid method using a soil-block technique. Analysis of the molecular weight distribution of the degraded cellulose indicated a fairly tight distribution centered around DP 232. From x-ray diffraction analysis it appears that there was a preferential attack on the smaller crystallites and amorphous regions of the cellulose by the fungus, confirming earlier work. Infrared spectroscopy and carboxyl determinations with methylene blue showed that carboxyl groups were present in the degraded cellulose. Uronic acids were not detected in acid hydrolysates of the brown-rotted cellulose, indicating that oxidation was not at C-6. However, several acids were separatedand are currently being studied.

Keywords: Wood decay, brown-rot, cellulose decomposition, Postia placenta

Publication Review Process: Non-Refereed (Other)

File size: 181 kb(s)

Date posted: 06/08/2012
RITS Product ID: 60122
Current FPL Scientist associated with this product
Ibach, Rebecca E.
Research Chemist
  

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