Ethanol and butanol production by fermentation of enzymatically saccharified SO2-prehydrolysed lignocellulosics

Parekh, Sarad R.; Parekh, R.S.; Wayman, Morris

doi:10.1016/0141-0229(88)90057-9

Cited by 59 publications

(23 citation statements)

References 25 publications

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“…In general, enzymatic hydrolysates do not have any fermentation inhibitor which could effect on ethanol yield and productivity. Our results were found quite similar to the earlier report of Parekh et al (1998), who observed ethanol yield (0.46 g/g) upon the fermentation of SO 2 pretreated corn stover enzymatic hydrolysate with P. stipitis CBS 5776. Akpan et al (2005) reported the ethanol production (8%) from the acid hydrolysate of groundnut shell and maize cobs after fermenting with Saccharomyces cerevesiae.…”

Section: Ethanol Fermentation By Free and Sorghum Stalks Immobilized supporting

confidence: 82%

Fermentation of Groundnut Shell Enzymatic Hydrolysate for Fuel Ethanol Production by Free and Sorghum Stalks Immobilized Cells of <em>Pichia stipitis</em> NCIM 3498

Chandrasekhar¹,

Chandel²,

Konakalla³

et al. 2011

International Journal of Chemical Reactor Engineering

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Groundnut shell (GS), after separation of pod, is readily available as a potential feedstock for production of fermentable sugars. The substrate was delignified with sodium sulfite. The delignified substrate released 670 mg/g of sugars after enzymatic hydrolysis (50• C, 120 rpm, 50 hrs) using commercial cellulases (Dyadic Xylanase PLUS, Dyadic Inc. USA). The groundnut shell enzymatic hydrolysate (45.6 g/L reducing sugars) was fermented for ethanol production with free and sorghum stalks immobilized cells of Pichia stipitis NCIM 3498 under submerged cultivation conditions. Immobilization of yeast cells on sorghum stalks were confirmed by scanning electron microscopy (SEM). A maximum of ethanol production (17.83 g/L, yield 0.44 g/g and 20.45 g/L, yield 0.47 g/g) was observed with free and immobilized cells of P. stipitis respectively in batch fermentation conditions. Recycling of immobilized cells showed a stable ethanol production (20.45 g/L, yield 0.47 g/g) up to 5 batches followed by a gradual downfall in subsequent cycles.

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Section: Ethanol Fermentation By Free and Sorghum Stalks Immobilized supporting

confidence: 82%

Fermentation of Groundnut Shell Enzymatic Hydrolysate for Fuel Ethanol Production by Free and Sorghum Stalks Immobilized Cells of <em>Pichia stipitis</em> NCIM 3498

Chandrasekhar¹,

Chandel²,

Konakalla³

et al. 2011

International Journal of Chemical Reactor Engineering

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“…However, depending on the origin of the biomass, pretreatment methods applied, and yeast culture used, the ethanol yield can vary greatly from 31 to 84% of the theoretical maximum value for wheat straw [9][10][11][12] and 58 to 88% for corn stover [15][16][17][18]. It is, therefore, necessary to develop conversion methods for various feedstocks based on optimum pretreatment, hydrolysis, and fermentation conditions.…”

Section: Introductionmentioning

confidence: 99%

Potential of Agricultural Residues and Hay for Bioethanol Production

Chen

Sharma-Shivappa

Keshwani

et al. 2007

Appl Biochem Biotechnol

157

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Production of bioethanol from agricultural residues and hays (wheat, barley, and triticale straws, and barley, triticale, pearl millet, and sweet sorghum hays) through a series of chemical pretreatment, enzymatic hydrolysis, and fermentation processes was investigated in this study. Composition analysis suggested that the agricultural straws and hays studied contained approximately 28.62-38.58% glucan, 11.19-20.78% xylan, and 22.01-27.57% lignin, making them good candidates for bioethanol production. Chemical pretreatment with sulfuric acid or sodium hydroxide at concentrations of 0.5, 1.0, and 2.0% indicated that concentration and treatment agent play a significant role during pretreatment. After 2.0% sulfuric acid pretreatment at 121°C/15 psi for 60 min, 78.10-81.27% of the xylan in untreated feedstocks was solubilized, while 75.09-84.52% of the lignin was reduced after 2.0% sodium hydroxide pretreatment under similar conditions. Enzymatic hydrolysis of chemically pretreated (2.0% NaOH or H 2 SO 4 ) solids with Celluclast 1.5 LNovozym 188 (cellobiase) enzyme combination resulted in equal or higher glucan and xylan conversion than with Spezyme® CP-xylanase combination. The glucan and xylan conversions during hydrolysis with Celluclast 1.5 L-cellobiase at 40 FPU/g glucan were 78.09 to 100.36% and 74.03 to 84.89%, respectively. Increasing the enzyme loading from 40 to 60 FPU/g glucan did not significantly increase sugar yield. The ethanol yield after fermentation of the hydrolyzate from different feedstocks with Saccharomyces cerevisiae ranged from 0.27 to 0.34 g/g glucose or 52.00-65.82% of the theoretical maximum ethanol yield.

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“…Therefore, various efforts are being made to find pretreatment methods to obtain hydrolysates with less inhibitors for efficient ABE production. One of these methods is steam pretreatment with SO 2 catalyst that has been used for ABE production (Parekh et al 1988). In addition, wet disk milling (WDM) has been recently suggested to produce hydrolysates with low levels of inhibitors (Zhang et al 2013).…”

Section: Fermentation Of Hydrolysates From Both Cellulose and Hemicelmentioning

confidence: 99%

“…Although the yield of enzymatic hydrolysis of cellulose decreased due to inhibitory effect of sugars in the media, the preparation of hydrolysates with higher total sugar concentration by this method has been suggested for improved ABE production from lignocellulosic materials (Qureshi et al 2008a). The pretreatments of dilute acid hydrolysis (Qureshi et al 2008a), alkaline peroxide (Qureshi et al 2008b), prehydrolysis with SO 2 (Parekh et al 1988), and wet disk milling (Zhang et al 2013) have been previously used in combination with The yield was calculated based on reported data assuming with some assumptions, e.g., solid recovery of 100 % c…”

Section: Fermentation Of Hydrolysates From Both Cellulose and Hemicelmentioning

confidence: 99%

Biobutanol from Lignocellulosic Wastes

Amiri

Karimi

Bankar

et al. 2015

Biofuel and Biorefinery Technologies

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The perceived inability to economically provide conventional petroleum to meet the growing energy demands is facing a diverse and broad set of challenges. The major technical and commercial drawbacks of the existing biofuels (bioethanol or biodiesel) have prompted the continuing development of more advanced biofuels such as biobutanol. Acetone-butanol-ethanol (ABE) fermentation is an old process which recently attracted new interests for the production of butanol as an advanced biofuel. Efficient use of low cost lignocellulosic wastes as a carbon source for ABE fermentation can be a proper approach for the economical production of biobutanol. This chapter focuses on the utilization of lignocellulosic materials in ABE fermentation process. It explains the ABE fermentation process especially the processes that were economically used in the Soviet Union, China, and South Africa in the twentieth century. It also summarizes different technologies that have been suggested for the utilization of lignocelluloses for biobutanol production.

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Ethanol and butanol production by fermentation of enzymatically saccharified SO2-prehydrolysed lignocellulosics

Cited by 59 publications

References 25 publications

Fermentation of Groundnut Shell Enzymatic Hydrolysate for Fuel Ethanol Production by Free and Sorghum Stalks Immobilized Cells of <em>Pichia stipitis</em> NCIM 3498

Fermentation of Groundnut Shell Enzymatic Hydrolysate for Fuel Ethanol Production by Free and Sorghum Stalks Immobilized Cells of <em>Pichia stipitis</em> NCIM 3498

Potential of Agricultural Residues and Hay for Bioethanol Production

Biobutanol from Lignocellulosic Wastes

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