Sugar produced from corncob pretreated with the combination of electron beam irradiation and enzymes
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2017
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AMERICAN CHEMICAL SOCIETY NATIONAL MEETING & EXPOSITION, 253rd
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Resumo
Corncob is a lignocellulosic material composed of cellulose, hemicellulose, and lignin.
Cellulose and hemicellulose are polysaccharides constituted of simple sugars (hexoses and pentoses).
However, these sugars are difficult to access, due to the presence of lignin, which is a polyphenolic
molecule that provides a high recalcitrance to plant tissue. An appropriate biomass pretreatment disrupts
the hydrogen bonds in crystalline cellulose, breaks down cross-linked matrix of hemicelluloses and lignin,
and raises the porosity and surface area of cellulose for subsequent enzymatic hydrolysis. There are
several pretreatment methods including, physical pretreatment (electron beam irradiation, grinding and
milling, microwave, and extrusion), chemical pretreatment (alkali, acid, organosolv, ozonolysis, and ionic
liquid), physico-chemical pretreatment (steam explosion, liquid hot water, ammonia fiber explosion, wet
oxidation, and CO2 explosion), and biological pretreatment. This study evaluated electron beam
irradiation (EB) in combination with enzymatic hydrolysis on corncob at different grain size to produce
sugars. Dry biomass samples after characterization were exposed to EB radiation doses of 0, 30, 50, 70,
100, and 200 kGy. The pretreated biomass samples were enzymatically hydrolyzed using the Cellic CTec2
from Novozymes. The structural changes and degree of crystallinity of the pretreated biomass were
studied by FTIR, DRX, DSC, TG and SEM analyses. Corncob in natura showed 6.3 % extractives, 40.3
% cellulose, 31.8 % hemicellulose, 17.3 % lignin, and 0.7 % ash. The EB in combination with enzymatic
hydrolysis of corncob is an environmentally sound biomass pretreatment.
Como referenciar
PASCOAL, ERIC; KLEINGESINDS, EDUARDO; MOURA, ESPERIDIANA; LUGAO, ADEMAR; RODRIGUES, RITA. Sugar produced from corncob pretreated with the combination of electron beam irradiation and enzymes. In: AMERICAN CHEMICAL SOCIETY NATIONAL MEETING & EXPOSITION, 253rd, April 2-6, 2017, San Francisco, CA, USA. Abstract... Washington, DC, USA: American Chemical Society, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/31184. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.