Identifier

etd-11042005-161219

Degree

Master of Science (MS)

Department

School of Nutrition and Food Sciences

Document Type

Thesis

Abstract

Sugarcane bagasse is a source of lignocellulosic biomass. It is a potential renewable energy source for ethanol production. It is naturally cheap, plentiful and has high cellulose content. The sugarcane bagasse contains 34.5% cellulose, 24% hemicellulose, and 22-25% lignin. Reactive Oxygen Species (ROS), singlet oxygen (1O2), superoxide (O2-), hydroxyl radicals (OH?, and hypochlorite ion (OCl-), were found to remove both hemicellulose and lignin from sugarcane bagasse. Ox-B (Day. 2004, US Patent 6,866,870), a solution of sodium hypochlorite and hydrogen peroxide, was studied for its effectiveness as a pretreatment for lignocellulosic biomass. The cellulose structure of the bagasse was easily separated from the hemicellulose and lignin by filtration after Ox-B treatment. The remaining solids on a wet basis, were 76.2% digestible by cellulases, after a 20:1 treatment (v/w) with an Ox-B solution (10,000 ppm sodium hypochlorite : 500 ppm hydrogen peroxide). At a constant pH 8, 38.6% weight loss and 97.4% cellulose digestibility were observed. Temperature did not affect weight loss or cellulose digestibility. Above a 2% Ox-B treatment, cellulose digestibility was 100%. Cellulose digestibility increased with time for up to 3 h on treatment with Ox-B. Sequential treatments improved cellulose digestibility at lower concentrations of Ox-B. Treatment with Ox-B followed by a caustic wash produced solids that were between 80 and 100% digestible by cellulases. Our studies indicate that Ox-B is a powerful room temperature chemical oxidant that increases cellulose digestibility of sugarcane bagasse. Oxidation of bagasse, by sequential Ox-B treatments for 30 min, at a pH of 8 and room temperature, followed by a caustic wash may have industrial potential.

Date

2005

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Donal F. Day

Included in

Life Sciences Commons

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