Estudo da eficiência do pré-tratamento do bagaço de abacaxi com perôxido de hidrogênio alcalino em diferentes granulometrias na obtenção de açúcares redutores totais
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2016-04-18
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Universidade Federal de Goiás
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This study examined the performance of pineapple bagasse for the production of
reducing sugars after pretreatment with alkaline hydrogen peroxide and acid and
enzymatic hydrolysis. They were determined after conducting preliminary acid and
enzymatic hydrolysis the best conditions for the bagasse pineapple used in dry form,
"in natura" and washed. Chosen the dry pomace condition, this was separated
granulometrically, wherein the average diameter fractions of 1.242 mm and 0.564 mm
were predominant among the amounts of sieved bagasse, these two fractions were
then chosen and denominated 20 and 48 mesh respectively, to evaluate the influence
of particle size on the release of total reducing sugars. Type DCCR designs were
conducted to evaluate the influence of weather pretreatment (h) Temperature (°C) and
concentration of alkaline hydrogen peroxide (%) in the performance of acid and
enzymatic hydrolysis, which was measured by the release of total reducing sugars
(TRS). Moreover, the mass loss caused in the samples 20 and 48 mesh after
pretreatment with alkaline hydrogen peroxide were observed. The results showed that
the highest yields of reducing sugars obtained for fractions 20 and 48 mesh, both the
acid hydrolysis with diluted sulfuric acid 2.9% (v/v) as the enzymatic hydrolysis with 9
FPU / g dry biomass at 50 °C and pH 4.8, were obtained when using lower levels of
time, temperature and concentration of peroxide to the pre-treatment with hydrogen
peroxide. The ART mass analysis after 8 h of reaction at 20 °C and concentration of
alkaline hydrogen peroxide at 2% (v/v) to acid and enzymatic hydrolysis at residue 20
mesh, were 0.092 g/g ART dry bagasse and 0.063 g/g of dry bagasse ART
respectively. As for the enzymatic and acid hydrolysis in the residue 48 mesh under the
same conditions was 0.074 g/g dry bagasse ART and 0.058 g/g ART respectively.
Therefore, it is believed that the smaller mass loss is related to obtaining higher yield of
reducing sugars. This is because, observing the mass losses of such biomasses
intended to acid and enzymatic hydrolysis, in both fractions pineapple pulp, 20 and 48
mesh after pretreatment with alkaline hydrogen peroxide were detected smaller mass
loss of 77.829% and 83.182% for bagasse of 20 mesh and 83.724% and 83.493% for
the bagasse of 48 mesh.
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MACEDO, L. C. V. Estudo da eficiência do pré-tratamento do bagaço de abacaxi com perôxido de hidrogênio alcalino em diferentes granulometrias na obtenção de açúcares redutores totais. 2016. 157 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2016.