Efeito do teor de umidade sobre o pré-tratamento a vapor e a hidrólise enzimática do bagaço de cana-de-açúcar

Pitarelo, Ana Paula; Silva, Thiago Alessandre da; Peralta-Zamora, Patricio Guillermo; Ramos, Luiz Pereira

doi:10.1590/s0100-40422012000800003

Cited by 27 publications

(14 citation statements)

References 28 publications

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“…As expected, differences were observed in the chemical composition of both native sugarcane bagasse and E. urograndis chips (Table 1) and these were in good agreement with the general knowledge about the compositional analysis of both grasses [16,17,25] and hardwoods [5,26]. In general, sugarcane bagasse presented lower glucan and lignin contents while its total extractives, pentosan and ash contents were much higher than those of E. urograndis wood chips.…”

Section: Chemical Analysis and Pretreatment By Steam Explosionsupporting

confidence: 88%

“…This method increases the accessibility of cellulose by deconstructing the associative structure of the plant cell wall, causing an increase in the substrate surface area and pore volume. Changes are also introduced into the biomass chemistry, particularly by acid hydrolysis and partial dissolution of hemicelluloses and lignin [17,18]. However, pretreatment conditions must be optimized to avoid undesirable side reactions such as carbohydrate dehydration and lignin condensation.…”

Section: Introductionmentioning

confidence: 99%

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Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Chiarello

Ramos

Neves

et al. 2016

Sustain Chem Process

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Cellulosic ethanol is one of the most important biotechnological products to mitigate the consumption of fossil fuels and to increase the use of renewable resources for fuels and chemicals. By performing this process at high total solids (TS) and low enzyme loadings (EL), one can achieve significant improvements in the overall cellulosic ethanol production process. In this work, steam-exploded materials were obtained from Eucalyptus urograndis chips and sugarcane bagasse to be subsequently used for enzymatic hydrolysis at high TS (20 wt%) and relatively low EL (13.3 FPU g −1 TS of Cellic CTec3 from Novozymes). Also, the fermentability of their corresponding hydrolysates was tested using an industrial strain of Saccharomyces cerevisiae (Thermosacc Dry from Lallemand). Enzymatic hydrolysis of steam-treated E. urograndis reached 125 g L −1 of glucose in 72 h, while steam-treated bagasse gave yields 25 % lower. Both substrate hydrolysates were easily converted to ethanol, giving yields above 25 g L −1 and productivities of 2.3 g L −1 h −1 for eucalypt and 2.2 g L −1 h −1 for bagasse after only 12 h of fermentation. Under the conditions used in this study, sugarcane bagasse glucans showed the potential to boost the ethanol production from sugarcane culms by 31 %, from the 80 L t −1 of first generation to a total production of 105 L t −1. On the other hand, E. urograndis plantations are able to achieve cellulosic ethanol productivities of 2832.2 L ha −1 year −1 , which was 57.8 % higher than the projected value of 1794.5 L ha −1 year −1 that was obtained for sugarcane bagasse.

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Section: Chemical Analysis and Pretreatment By Steam Explosionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Chiarello

Ramos

Neves

et al. 2016

Sustain Chem Process

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“…Finally, each of these individual components was converted to their original cane biomass polysaccharides by taking into account their respective hydrolysis factors, which correspond to 0.95 for cellobiose, 0.90 for glucose, 0.88 for xylose and arabinose, and 0.72 for acetic acid. 21 …”

Section: Methodsmentioning

confidence: 99%

Ethanol Production from Sugarcane Bagasse Using Phosphoric Acid-Catalyzed Steam Explosion

Pitarelo¹,

Fonseca²,

Chiarello³

et al. 2016

Journal of the Brazilian Chemical Society

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The steam explosion was carried out in the absence (autohydrolysis) and presence of phosphoric acid to evaluate the effects of temperature (180 and 210 °C), acid concentration (0 and 19 mg g -1 , dry basis) and pretreatment time (5 and 10 min) on the structure and reactivity of sugarcane bagasse. Glucan recovery was used as the main response factor for pretreatment optimization through a central composite design. Autohydrolysis at 210 °C for 10 min had a good pretreatment performance but phosphoric acid catalysis (19 mg g -1 ) resulted in better yields under considerably milder conditions (180 °C, 5 min). Hydrolysis of both substrates for 96 h using 8 wt.% total solids and 30 mg g -1 Cellic ® CTec2 (Novozymes) provided total glucose yields of 75% in average. The production of cellulosic ethanol was assessed by both separate and simultaneous hydrolysis and fermentation using Saccharomyces cerevisiae. Freeze-drying of pretreatment water solubles reduced the concentration of furfural, hydroxymethylfurfural and acetic acid by more than 80% and this eliminated their inhibitory effect on yeast fermentation.

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“…O etanol é um dos principais combustíveis renováveis da atuali dade e seu uso em grande escala contribui diretamente para a redução do uso extensivo de combustíveis fósseis no setor automotivo (PITARELO et al, 2012). No Brasil, mais de trezentas usinas de álcool e açúcar processam cerca de 500 milhões de toneladas de cana-de-açúcar por ano, gerando aproximadamente 150 milhões de toneladas de bagaço e palha (CONAB, 2012).Portanto, a viabilidade econômica da produção de álcool pode ser otimizada agregando valor aos resíduos industriais oriundos do seu processo de produção (LORA; ANDRADE, 2008).…”

Section: Bagaço De Cana De Açúcarunclassified

Embalagens biodegradáveis de amido reforçadas com fibras lignocelulósicas provenientes de resíduos agroindustriais

Debiagi

Ivano

Nascimento³

et al. 2013

BBR

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There is an increasing interest in the utilization of renewable resources for the production of biodegradable packaging. Among the biopolymers, starches from several sources have been considered as one of the most promising material for this purpose, and the reasons for this are that starches are biodegradable, inexpensive and available in the worldwide. However, materials produced exclusively from this biopolymer tend to exhibit certain performance limitations, such as poor mechanical behavior and susceptibility to moisture when they are stored in high relative humidity. This could be overcome by using natural fibers as reinforcement material into starch polymeric matrices. This work presents a bibliography review about starch biodegradable packaging reinforced with lignocelulosic fibers from agroindustrial wastes. Keywords RESUMOO interesse no emprego de matérias-primas provenientes de recursos renováveis para a produção de embalagens biodegradáveis vem crescendo. Dentre os biopolímeros mais promissores para este fim estão os amidos de diversas fontes botânicas, que são biodegradáveis, têm custo baixo e estão disponíveis em todo o mundo. Entretanto, materiais produzidos exclusivamente com amido tendem a apresentar certas limitações de desempenho, tais como propriedades mecânicas pobres e susceptibilidade à umidade quando armazenados sob ambientes de elevadas umidades relativas. Isto pode ser superado pelo emprego de fibras naturais provenientes de resíduos da agroindústria como materiais de reforço às matrizes poliméricas de amido. Este trabalho apresenta uma revisão bibliográfica sobre o uso de resíduos agroindustriais que atuariam como materiais de reforço em embalagens biodegradáveis de amido.Palavras-chave: novos materiais; biodegradabilidade; resíduos agroindustriais. BBR -Biochemistry and Biotechnology Reports

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Efeito do teor de umidade sobre o pré-tratamento a vapor e a hidrólise enzimática do bagaço de cana-de-açúcar

Cited by 27 publications

References 28 publications

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Production of cellulosic ethanol from steam-exploded Eucalyptus urograndis and sugarcane bagasse at high total solids and low enzyme loadings

Ethanol Production from Sugarcane Bagasse Using Phosphoric Acid-Catalyzed Steam Explosion

Embalagens biodegradáveis de amido reforçadas com fibras lignocelulósicas provenientes de resíduos agroindustriais

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