Evaluation of oat hull hemicellulosic hydrolysate fermentability employing Pichia stipitis

Chaud, Luciana Cristina Silveira; Silva, Débora Danielle Virgínio da; Mattos, Rafael Taino de; Felipe, Maria das Graças de Almeida

doi:10.1590/s1516-89132012000500017

Cited by 20 publications

(11 citation statements)

References 27 publications

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“…Arabinose assimilation (data not shown) was not observed during the fermentation process. This behavior is consistent with the results reported in other works during fermentation with S. stipitis (Chaud et al, 2012;. Figure 4a shows that ethanol production increased from the 10 th hour of fermentation, reaching a maximum concentration of ethanol (22 g/L) at 55 hours.…”

Section: Fermentability Of Sorghum Bagasse Hemicellulosic Hydrolysatesupporting

confidence: 92%

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Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Camargo

Sydney

Leonel

et al. 2019

Braz. J. Chem. Eng.

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This study aimed to determine the best dilute acid hydrolysis condition for the hemicellulosic fraction of sweet sorghum bagasse for ethanol production by Scheffersomyces stipitis. The experiment followed a 2 3 factorial design with four central points, and had as variables: sulfuric acid concentration, temperature and hydrolysis time. Sorghum bagasse presented the following chemical composition: 24.77% of lignin, 31.28% of hemicellulose and 34.80% of cellulose. The hydrolysis that resulted in the highest sugars concentration (14.22 g/L of xylose and 2.42 g/L glucose) was 1.75% H 2 SO 4 , 121 ºC and 40 minutes. This same condition provided low concentrations of toxic compounds (1.34 g/L of acetic acid, 0.90 g/L of phenol; 124.54 mg/L of hydroxymethylfurfural (HMF) and 978 mg/L of furfural). The fermentation of the hemicellulose-derived sugars by S. stiptis resulted in 22 g/L of ethanol, Y P/S 0.40 g/g and Qp 0.34 g/L.h.

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Section: Fermentability Of Sorghum Bagasse Hemicellulosic Hydrolysatesupporting

confidence: 92%

“…From that moment, there was no increase in microbial biomass. When Chaud et al (2012) used this same yeast grown in oat hull hemicellulosic hydrolysate (40 g/L xylose) a final biomass concentration close to 6 g/L was observed in 72 hours fermentation.…”

Section: Characterization Of the Original Concentrated And Detoxifiementioning

confidence: 99%

Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Camargo

Sydney

Leonel

et al. 2019

Braz. J. Chem. Eng.

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“…Miscanthus is an energy crop unpretentious to breeding conditions, with a biomass gain of up to 15 ton/ha [24,25]. Oat hulls are an abundant and available raw source in agricultural regions worldwide, including Russia, and are basically regarded as pentose-rich biomass [26,27].…”

Section: Introductionmentioning

confidence: 99%

Pretreatments of Non-Woody Cellulosic Feedstocks for Bacterial Cellulose Synthesis

2019

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Pretreatment of biomass is a key step in the production of valuable products, including high-tech bacterial cellulose. The efficiency of five different pretreatment methods of Miscanthus and oat hulls for enzymatic hydrolysis and subsequent synthesis of bacterial cellulose (BC) was evaluated herein: Hydrothermobaric treatment, single-stage treatments with dilute HNO3 or dilute NaOH solution, and two-stage combined treatment with dilute HNO3 and NaOH solutions in direct and reverse order. The performance of enzymatic hydrolysis of pretreatment products was found to increase by a factor of 4−7. All the resultant hydrolyzates were composed chiefly of glucose, as the xylose percentage in total reducing sugars (RS) was 1−9%. The test synthesis of BC demonstrated good quality of nutrient media prepared from all the enzymatic hydrolyzates, except the hydrothermobaric treatment hydrolyzate. For biosynthesis of BC, single-stage pretreatments with either dilute HNO3 or dilute NaOH are advised due their simplicity and the high performance of enzymatic hydrolysis of pretreatment products (RS yield 79.7−83.4%).

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“…Miscanthus is an energy crop unpretentious to growth conditions, with a biomass gain of up to 15 t/ha [5,6]. Oat hulls are an abundant and available raw source for agricultural regions of the world, including Russia, and considered mainly as a pentosan-containing raw material [7,8].…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Hydrolysis of Hydrotropic Pulps at Different Substrate Loadings

Denisova

Makarova

Pavlov

et al. 2015

Appl Biochem Biotechnol

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Enzymatic hydrolysis of cellulosic raw materials to produce nutrient broths for microbiological synthesis of ethanol and other valuable products is an important field of modern biotechnology. Biotechnological processing implies the selection of an effective pretreatment technique for raw materials. In this study, the hydrotropic treatment increased the reactivity of the obtained substrates toward enzymatic hydrolysis by 7.1 times for Miscanthus and by 7.3 times for oat hulls. The hydrotropic pulp from oat hulls was more reactive toward enzymatic hydrolysis compared to that from Miscanthus, despite that the substrates had similar compositions. As the initial substrate loadings were raised during enzymatic hydrolysis of the hydrotropic Miscanthus and oat hull pulps, the concentration of reducing sugars increased by 34 g/dm(3) and the yield of reducing sugars decreased by 31 %. The findings allow us to predict the efficiency of enzymatic hydrolysis of hydrotropic pulps from Miscanthus and oat hulls when scaling up the process by volume.

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Evaluation of oat hull hemicellulosic hydrolysate fermentability employing Pichia stipitis

Cited by 20 publications

References 27 publications

Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Pretreatments of Non-Woody Cellulosic Feedstocks for Bacterial Cellulose Synthesis

Enzymatic Hydrolysis of Hydrotropic Pulps at Different Substrate Loadings

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