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Title: Non-enzymatic depolymerization of cotton cellulose by fungal mimicking metabolites

Source: International Biodeterioration & Biodegradation , 65 (2011) 553-559.

Author(s)Hastrup, Anne Christine Steenkjaer; Howell, Caitlin; Jensen, Bo; Green III, Fredrick

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4723-3

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 too large to penetrate the S3 layer of intact wood cells. We investigated the most notable of these compounds, i.e. hydrogen peroxide, iron, and oxalic acid. The former two are involved in the Fenton reaction in which they react to formhydroxyl radicals, which cause an accelerated depolymerization in cotton cellulose. We found the same reaction to be caused by both iron Fe3+ and Fe2+. A 10 mM oxalic acid solution showed significant depolymerization effect on cotton cellulose. An oxalic acid/sodium oxalate buffered pH gradient had an inhibitory effect on the reduction of cellulose polymers at increased pH values. The organic iron chelator, EDTA, was found to promote depolymerization of cellulose in combination with Fenton's reagents, but in hibited the effect of oxalic acid in the absence of iron and hydrogen peroxide. Manganese was tested to see if metals other than iron could generate a significant impact on the degree of polymerization (DP) in cotton cellulose. Depolymerizing propertie scomparable to iron were seen. The results confirm that low molecular weight metabolites are capable of depolymerizing cellulose and suggest an importance of these mechanisms during incipient decay by brown rot fungi.

Keywords: Cotton, wood-decaying fungi, hydrogen peroxide, oxalic acid, iron, brown rot, oxalates, manganese, fungal metabolites, crop residues, agricultural wastes, utilization, biomass utilization, cellulose, fiber utilization, plant fibers, metal ions, ethylenediaminetetraacetic acid, depolymerization, decay fungi, Fenton system, holocellulose, polymers, polymerization, sodium oxalate, cotton cellulose, EDTA, ethylenediamine tetra-acetic acid, Fenton reaction

Publication Review Process: Formally Refereed

File size: 277 kb(s)

Date posted: 05/02/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 39107
Current FPL Scientist associated with this product
Green, Frederick
Research Microbiologist
  

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