Ethanol Production from Traditional and Emerging Raw Materials

Rudolf, Andreas; Karhumaa, Kaisa; Hahn‐Hägerdal, Bärbel

doi:10.1007/978-1-4020-8292-4_23

Cited by 16 publications

(12 citation statements)

References 153 publications

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“…Xylose is the second most abundant fermentable sugar in lignocellulosic feedstocks [84]; however, commercial yeast strains are unable to convert it into ethanol [85] (reviewed in [86]). For this reason, prospection of naturally xylose-fermenting yeasts species (e.g., Scheffersomyces stipitis or Pachisolen tannophilus), comparative genomics, and evolutionary analysis have been used as strategies to determine the limiting steps in pentose metabolism [89,90].…”

Section: Microbial Metabolomicsmentioning

confidence: 99%

Metabolomics applied in bioenergy

Abdelnur

Caldana

Martins

2014

Chem. Biol. Technol. Agric.

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Metabolomics, which represents all the low molecular weight compounds present in a cell or organism in a particular physiological condition, has multiple applications, from phenotyping and diagnostic analysis to metabolic engineering and systems biology. In this review, we discuss the use of metabolomics for selecting microbial strains and engineering novel biochemical routes involved in plant biomass production and conversion. These aspects are essential for increasing the production of biofuels to meet the energy needs of the future. Additionally, we provide a broad overview of the analytic techniques and data analysis commonly used in metabolomics studies.

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Section: Microbial Metabolomicsmentioning

confidence: 99%

Metabolomics applied in bioenergy

Abdelnur

Caldana

Martins

2014

Chem. Biol. Technol. Agric.

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“…all produce cocktails of inhibitory chemicals that act to suppress the activities of yeast (and bacteria) in converting hydrolysate sugars to ethanol. Various approaches have therefore been adopted to alleviate the deleterious effects of these inhibitors 98,[126][127][128]136 For example, these can be reduced using steam stripping, nanofiltration membranes, supercritical fluid extraction, or polymeric adsorbent materials (e.g., amberlite resins).…”

Section: Lignocellulosic Hydrolysate Fermentationsmentioning

confidence: 99%

“…These processes all require the hydrolysis of pre-treated biomass (with cellulase and hemicellulase enzymes or microbes); and fermentation of resultant hexose (glucose, mannose, galactose) and pentose (xylose, arabinose) sugars 66,67,98,112 . Fermenters may be operated in batch, fed-batch, batch fill-and-draw or continuous operation modes.…”

Section: Bioethanol Fermentation Systemsmentioning

confidence: 99%

125th Anniversary Review: Fuel Alcohol: Current Production and Future Challenges

Walker

2011

Journal of the Institute of Brewing

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J. Inst. Brew. 117(1), 3-22, 2011Global research and industrial development of liquid transportation biofuels are moving at a rapid pace. This is mainly due to the significant roles played by biofuels in decarbonising our future energy needs, since they act to mitigate the deleterious impacts of greenhouse gas emissions to the atmosphere that are contributors of climate change. Governmental obligations and international directives that mandate the blending of biofuels in petrol and diesel are also acting as great stimuli to this expanding industrial sector. Currently, the predominant liquid biofuel is bioethanol (fuel alcohol) and its worldwide production is dominated by maize-based and sugar cane-based processes in North and South America, respectively. In Europe, fuel alcohol production employs primarily wheat and sugar beet. Potable distilled spirit production and fuel alcohol processes share many similarities in terms of starch bioconversion, fermentation, distillation and co-product utilisation, but there are some key differences. For example, in certain bioethanol fermentations, it is now possible to yield consistently high ethanol concentrations of ~20% (v/v). Emerging fuel alcohol processes exploit lignocellulosic feedstocks and scientific and technological constraints involved in depolymerising these materials and efficiently fermenting the hydrolysate sugars are being overcome. These so-called secondgeneration fuel alcohol processes are much more environmentally and ethically acceptable compared with exploitation of starch and sugar resources, especially when considering utilisation of residual agricultural biomass and biowastes. This review covers both first and second-generation bioethanol processes with a focus on current challenges and future opportunities of lignocellulose-to-ethanol as this technology moves from demonstration pilot-plants to full-scale industrial facilities.

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“…in saccharides such as sugar cane or sugar beets and raw materials rich in starch such as corn and wheat (Rudolf et al, 2009). In Thailand, the main raw materials used for ethanol production are sugarcane molasses and cassava.…”

Section: Introductionmentioning

confidence: 99%

Repeated-batch ethanol fermentation from sweet sorghum juice by free cells of Saccharomyces cerevisiae NP 01

Ariyajarearnwong¹,

Laopaiboon²,

Jaisil³

et al. 2011

Afr. J. Biotechnol.

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Low-cost inoculum preparation (IP) media for ethanol production were developed. It was found that sweet sorghum juice (SSJ) containing 100 g l -1 of total sugar without nutrient supplement could be used as the low-cost IP medium instead of the typical IP medium or yeast extract malt extract (YM) medium. Ethanol production from the SSJ (total soluble solids of 24 °Bx) by the inoculum of Saccharomyces cerevisiae NP 01 in batch and repeated-batch fermentations was then investigated. The fermentations were carried out under static condition in 500 ml air-locked Erlenmeyer flasks at 30°C and the initial yeast cell concentration was 1×10 8 cells ml , 2.29 ± 0.01 g l -1 h -1 and 0.51 ± 0.02, respectively. In the repeated-batch fermentation, the yeasts could be used at least eight successive batches without a marked decrease in ethanol production. The repeated-batch fermentation with fill and drain volume at 75% of the working volume gave higher ethanol production efficiencies than those at 50% of the working volume in terms of total ethanol production rate (g h -1). The average P, Q p and Y p/s of the eight successive batches at 75% fill and drain volume in a 2 L bioreactor at the agitation rate of 100 rev min -1 were 93.30 ± 9.44 g l -1 , 1.21 ± 0.43 g l -1 h -1 and 0.48 ± 0.03, respectively.

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Ethanol Production from Traditional and Emerging Raw Materials

Cited by 16 publications

References 153 publications

Metabolomics applied in bioenergy

Metabolomics applied in bioenergy

125th Anniversary Review: Fuel Alcohol: Current Production and Future Challenges

Repeated-batch ethanol fermentation from sweet sorghum juice by free cells of Saccharomyces cerevisiae NP 01

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