Bioconversion of lignocellulosic waste to bioethanol by Trichoderma and yeast fermentation

Saravanakumar, Kandasamy; Kathiresan, K.

doi:10.1007/s13205-013-0179-4

Cited by 23 publications

(8 citation statements)

References 18 publications

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“…At present, the conversion of low-value agriculture wastes into valuable commodities, energy, chemicals and microbial protein by saccharification and fermentation processes is not economically feasible, largely due to the costs of cellulosic materials and cellulolytic enzymes, as well as technical problems associated with cellulose saccharification. 1 , 2 , 3 , 4 , 5 There is an increased interest in using thermophilic bacteria Geobacillus stearothermophilus for the production of cellulases and separate saccharification and fermentation of lignocellulosic biomass due to their higher operating temperatures and broad substrate range. 6 , 7 The complete cellulose hydrolysis can be achieved by a combination of three types of cellulases: endoglucanases, which cleave internal glucosidic bonds; exoglucanases, which cleave cellobiosyl units from the ends of cellulose; and glucosidase, which cleaves glucose units from cello-oligosaccharides.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic saccharification and fermentation of cellulosic date palm wastes to glucose and lactic acid

Alrumman

2016

Brazilian Journal of Microbiology

111

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The bioconversion of cellulosic wastes into high-value bio-products by saccharification and fermentation processes is an important step that can reduce the environmental pollution caused by agricultural wastes. In this study, enzymatic saccharification of treated and untreated date palm cellulosic wastes by the cellulases from Geobacillus stearothermophilus was optimized. The alkaline pre-treatment of the date palm wastes was found to be effective in increasing the saccharification percentage. The maximum rate of saccharification was found at a substrate concentration of 4% and enzyme concentration of 30 FPU/g of substrate. The optimum pH and temperature for the bioconversions were 5.0 and 50 °C, respectively, after 24 h of incubation, with a yield of 31.56 mg/mL of glucose at a saccharification degree of 71.03%. The saccharification was increased to 94.88% by removal of the hydrolysate after 24 h by using a two-step hydrolysis. Significant lactic acid production (27.8 mg/mL) was obtained by separate saccharification and fermentation after 72 h of incubation. The results indicate that production of fermentable sugar and lactic acid is feasible and may reduce environmental pollution by using date palm wastes as a cheap substrate.

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Section: Introductionmentioning

confidence: 99%

Enzymatic saccharification and fermentation of cellulosic date palm wastes to glucose and lactic acid

Alrumman

2016

Brazilian Journal of Microbiology

111

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“…Table 2 shows the comparison of bioethanol production by different strains of S. cerevisiae from various types of lignocellulosic biomass via SSF at higher temperatures. Saravanikumar and Kathiresan [ 50 ], in their studies on sawdust, reported that sawdust hydrolysate was produced by consecutive acid treatment and enzymatic hydrolysis, using cellulase from Trichoderma estonicum SKS1. Bioethanol was produced via SHF by S. cerevisiae JN387604 at 36.5 °C, obtaining an ethanol concentration of 55.2 g/L and a theoretical yield of 85.6% at a fermentation period of 102 h. Recently, waste jasmine flower has been used as substrate for bioethanol production.…”

Section: Discussionmentioning

confidence: 99%

Bioethanol Production from Cellulose-Rich Corncob Residue by the Thermotolerant Saccharomyces cerevisiae TC-5

Boonchuay

Techapun

Leksawasdi

et al. 2021

JoF

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This study aimed to select thermotolerant yeast for bioethanol production from cellulose-rich corncob (CRC) residue. An effective yeast strain was identified as Saccharomyces cerevisiae TC-5. Bioethanol production from CRC residue via separate hydrolysis and fermentation (SHF), simultaneous saccharification and fermentation (SSF), and prehydrolysis-SSF (pre-SSF) using this strain were examined at 35–42 °C compared with the use of commercial S. cerevisiae. Temperatures up to 40 °C did not affect ethanol production by TC-5. The ethanol concentration obtained via the commercial S. cerevisiae decreased with increasing temperatures. The highest bioethanol concentrations obtained via SHF, SSF, and pre-SSF at 35–40 °C of strain TC-5 were not significantly different (20.13–21.64 g/L). The SSF process, with the highest ethanol productivity (0.291 g/L/h), was chosen to study the effect of solid loading at 40 °C. A CRC level of 12.5% (w/v) via fed-batch SSF resulted in the highest ethanol concentrations of 38.23 g/L. Thereafter, bioethanol production via fed-batch SSF with 12.5% (w/v) CRC was performed in 5-L bioreactor. The maximum ethanol concentration and ethanol productivity values were 31.96 g/L and 0.222 g/L/h, respectively. The thermotolerant S. cerevisiae TC-5 is promising yeast for bioethanol production under elevated temperatures via SSF and the use of second-generation substrates.

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“…Additionally, basidiomycetes, for example, Phanerochaete chrysosporium, have been found to degrade farm waste [81,127]. The pretreatment of agricultural pulp waste employed Streptomyces and white-rot fungi for the degradation of lignin where lignin reduction was measured in hard wood (23.5%) and soft wood (10.5%) [128]. Delignification (85.6%) was attained in sawdust by a 55.2 g/L pretreatment with a cellulose enzyme (derivative of Trichoderma/Hypocrea) [128].…”

Section: Biological Pretreatment Of Wastewatermentioning

confidence: 99%

Recent Progress and Trends in the Development of Microbial Biofuels from Solid Waste—A Review

2021

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This review covers the recent progress in the design and application of microbial biofuels, assessing the advancement of genetic engineering undertakings and their marketability, and lignocellulosic biomass pretreatment issues. Municipal solid waste (MSW) is a promising sustainable biofuel feedstock due to its high content of lignocellulosic fiber. In this review, we compared the production of fatty alcohols, alkanes, and n-butanol from residual biogenic waste and the environmental/economic parameters to that of conventional biofuels. New synthetic biology tools can be used to engineer fermentation pathways within micro-organisms to produce long-chain alcohols, isoprenoids, long-chain fatty acids, and esters, along with alkanes, as substitutes to petroleum-derived fuels. Biotechnological advances have struggled to address problems with bioethanol, such as lower energy density compared to gasoline and high corrosive and hygroscopic qualities that restrict its application in present infrastructure. Biofuels derived from the organic fraction of municipal solid waste (OFMSW) may have less environmental impacts compared to traditional fuel production, with the added benefit of lower production costs. Unfortunately, current advanced biofuel production suffers low production rates, which hinders commercial scaling-up efforts. Microbial-produced biofuels can address low productivity while increasing the spectrum of produced bioenergy molecules.

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Bioconversion of lignocellulosic waste to bioethanol by Trichoderma and yeast fermentation

Cited by 23 publications

References 18 publications

Enzymatic saccharification and fermentation of cellulosic date palm wastes to glucose and lactic acid

Enzymatic saccharification and fermentation of cellulosic date palm wastes to glucose and lactic acid

Bioethanol Production from Cellulose-Rich Corncob Residue by the Thermotolerant Saccharomyces cerevisiae TC-5

Recent Progress and Trends in the Development of Microbial Biofuels from Solid Waste—A Review

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