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Title: Chemical mediated depolymerization of cotton cellulose for the understanding of non-enzymatic fungal decay

Source: From IRG CD titled 41st iRG Biarritz, May 9-13, 2010 in the 4st annual meeting of the International Research Group on Wood Protection; pp.

Author(s)Hastrup, Anne Christine Steenkjær; Jensen, Bo; Green,III Frederick

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4723-4

Abstract: Small, low molecular weight non-enzymatic compounds have been linked to the early stages of brown rot decay as the enzymes involved with holocellulose degradation are found to be too large to penetrate the S3 layer of intact wood cells. The most pronounced of these which were analyzed in this study are hydrogen peroxide, iron, and oxalic. The compounds related to the Fenton reaction: the combination of hydrogen peroxide and iron caused marked lowering of the degree of polymerization in the cotton cellulose after treatment. This was the case for both iron ions; Fe3+ and Fe2+. A 10mM solution of oxalic acid also showed significant depolymerizing effect on cotton cellulose, whereas diluting the oxalic acid with sodium oxalate to obtain a pH gradient, showed that this decreased the effect reducing of oxalic acid. In addition an organic iron chelator, EDTA, was tested but was found to inhibit depolymerization when in solution with chemicals related to Fenton chemistry. Manganese was tested to see if other metals than iron could generate an significant impact on the degree of polymerization of cotton cellulose and the metal showed good depolymerizing properties as a substitute for iron. We conclude that low molecular weight metabolites are capable of effectively depolymerizing cellulose during incipient decay by brown-rot fungi.

Keywords: Hydrogen peroxide, oxalic acid, depolymerization, Fenton reaction, cotton cellulose, cotton, wood-decaying fungi, iron, brown rot, oxalates, manganese, fungal metabolites, cellulose, decay fungi, Fenton system, holocellulose, polymers, polymerization, sodium oxalate

Publication Review Process: Non-Refereed (Other)

File size: 262 kb(s)

Date posted: 07/15/2010
RITS Product ID: 35806
Current FPL Scientist associated with this product
Green, Frederick
Research Microbiologist
  

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