Production of ethanol 3G from Kappaphycus alvarezii: Evaluation of different process strategies

Hargreaves, Paulo Iiboshi; Barcelos, Carolina Araújo; Costa, Antônio Carlos Augusto da; Pereira, Nei

doi:10.1016/j.biortech.2013.02.002

Cited by 87 publications

(65 citation statements)

References 21 publications

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“…22 Generally, it is reported that, raw materials which contain lignin and hemicellulose, were pretreated at the temperatures above 160 °C with 0.5-1.5% (v/v) acid solutions. 23 In another study, corn fibers were pretreated with sulfuric acid at the temperatures of 120 °C and 140 °C and 60 min pre-treatment time. It was observed that, yield of monomeric carbohydrates decreases with increasing pre-treatment temperatures.…”

Section: Effect Of Pre-treatment Temperature On Bioethanol Productionmentioning

confidence: 99%

“…It was found that the highest productivity was achieved with 1% H 2 SO 4 solution and 60 min pre-treatment time. 23 Results of the experiments conducted at 100 °C for 15, 30 and 60 min with 0.75 and 1.5% (w/v) KOH solution were given in Fig 7. As can be seen in Fig 7, the highest yield was obtained under the conditions of 0.75% (w/v) KOH solution for 60 min. On the other hand, the highest yield was obtained with 15 min using 1.5% (w/v) KOH solution.…”

Section: Effect Of Pre-treatment Time On Bioethanol Productionmentioning

confidence: 99%

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Effect of Chemical Pre-treatments on Bioethanol Production from Chlorella minutissima

Sert

İnan

Özçimen

2018

ACSi

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In recent years, algal bioethanol production comes into prominence as a trend towards sustainable development. Due to being sustainable energy source and environmental friendly, bioethanol production from algae is becoming increasingly popular all over the world. However, yield of bioethanol production from algae is lower than first generation feedstock's currently, and needs to be improved. In order to increase bioethanol yield, pre-treatments should be performed as cell disruption process on algal biomass. For this reason, researchers investigate the most appropriate pre-treatment method and its parameters for high yield bioethanol production from algae. In this study, cultivated Chlorella minutissima was utilized for bioethanol production. Effects of pre-treatment method (dilute acid and alkaline), chemical concentration, pre-treatment temperature and pre-treatment time on bioethanol yield were investigated. It was found that, the highest bioethanol yield was obtained as 18.52% with acid pre-treatment at pre-treatment temperature of 100 °C and pre-treatment time of 60 minutes.

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Section: Effect Of Pre-treatment Temperature On Bioethanol Productionmentioning

confidence: 99%

Section: Effect Of Pre-treatment Time On Bioethanol Productionmentioning

confidence: 99%

Effect of Chemical Pre-treatments on Bioethanol Production from Chlorella minutissima

Sert

İnan

Özçimen

2018

ACSi

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“…However, processes using sugar contained in marine organisms, such as seaweeds, are recent and restricted to a few species (Hargreaves, Barcelos, Costa, & Pereira, 2013;Jiang, Ingle, & Golberg, 2016;Meinita, Hong, & Jeong , 2012a;Meinita et al, 2012b;Meinita et al, 2013;Park et al, 2014). Seaweeds are photosynthetic organisms, able to absorb CO 2 and required nutrients from the surrounding water through their thalli.…”

Section: Introductionmentioning

confidence: 99%

“…The galactans of the red seaweeds are homogeneous polymers with alternates units of 3⟶β-D-galactose and 4⟶α-D-galactose or 3,6-anhydro-α-D-galactose, usually sulfated in specific positions (Hargreaves et al, 2013;Murano, Toffanin, Cecere, Rizzo, & Knutsen, 1997;Yanagisawa et al, 2011). After hydrolyzed, the red seaweeds generate two main monosaccharides, the glucose, derived from cellulose and starch and the galactose, from galactans, which are subsequently fermented (Yanagisawa et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

<b>Optimized acid hydrolysis of the polysaccharides from the seaweed <i>Solieria filiformis</i> (Kützing) P.W. Gabrielson for bioethanol production

Castro

Benevídes

Cabral

et al. 2017

Acta Sci. Biol. Sci.

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ABSTRACT. The seaweeds are bio-resource rich in sulfated and neutral polysaccharides. The tropical seaweed species used in this study (Solieria filiformis), after dried, shows 65.8% (w/w) carbohydrate, 9.6% (w/w) protein, 1.7% (w/w) lipid, 7.0% (w/w) moisture and 15.9% (w/w) ash. The dried seaweed was easily hydrolyzed under mild conditions (0.5 M sulfuric acid, 20 min.), generating fermentable monosaccharides with a maximum hydrolysis efficiency of 63.21%. Galactose and glucose present in the hydrolyzed were simultaneously fermented by Saccharomyces cerevisiae when the yeast was acclimated to galactose and cultivated in broth containing only galactose. The kinetic parameters of the fermentation of the seaweed hydrolyzed were Y (P⁄S) = 0.48 ± 0.02 g.g, η = 94.1%, representing a 41% increase in bioethanol productivity. Therefore, S. filiformis was a promising renewable resource of polysaccharides easily hydrolyzed, generating a broth rich in fermentable monosaccharides for ethanol production.Keywords: iota-carrageenan, cellulose, galactose, kinetic parameters, fermentation, acclimation, sulfuric acid.Hidrólise ácida otimizada dos polissacarídeos da macroalga Solieria filiformis (Kützing) P.W. Gabrielson para produção de bioetanol RESUMO. As algas marinhas são recursos naturais ricos em polissacarídeos sulfatados e neutros. A espécie de macroalga tropical utilizada neste estudo (Solieria filiformis) apresentou teores de carboidratos de 65,8% (m/m), proteínas de 9,6% (m/m), lipídios de 1,7% (m/m), umidade de 7,0% (m/m) e 15,9 % (m/m) de cinzas. A macroalga seca foi facilmente hidrolisada em condições brandas, na presença de ácido sulfúrico 0,5 M, por 20 min, produzindo monossacarídeos fermentáveis com uma eficiência de hidrólise máxima de 63,21%. A galactose e a glicose presentes no hidrolisado foram fermentadas simultaneamente por Saccharomyces cerevisiae, após aclimatação da levedura cultivada em meio contendo apenas galactose como fonte de carbono. Os parâmetros cinéticos da fermentação do hidrolisado algáceo pela levedura aclimatada a galactose foram Y (P/S) = 0,48 ± 0,02 g.g filiformis se mostrou um recurso renovável promissor como fonte de polissacarídeos facilmente hidrolisados, gerando um meio nutritivo rico em glucose e galactose para a produção de etanol.

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“…Co-cultures or microbial consortia may also be utilized in the CBP systems as the third methodology. Brandon et al 2011Kang et al, 2010Kim et al, 2008Geddes et al, 2011Nieves et al, 2011Mullinnix, 2014Yang et al, 2014Jin et al, 2014 Jin et al 2012aOhgren et al 2006Wang et al, 2014aYasuda et al, 2014Zhu et al, 2014Fonseca et al, 2011Teixeira et al, 1999Jin et al, 2010Tang et al, 2011Zhang (J) et al, 2009Kim and Lee, 2005Zhang et al, 2012bYu et al, 2014Moreno et al, 2013Erdei et al, 2013aBallesteros et al, 2013Geddes et al, 2013Turhan et al, 2014Lan et al, 2013Hargreaves et al, 2013Alvira et al, 2011Olofsson et al, 2010a . In co-culture systems, saccharolytic and ethanologenic microorganisms are co-cultured to enhance efficient saccharification and fermentation in one pot.…”

Section: Strategies To Design Ideal Microorganisms For Cbpmentioning

confidence: 99%

Advances in consolidated bioprocessing systems for bioethanol and butanol production from biomass: a comprehensive review

2015

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HIGHLIGHTS Various CBP strategies have been discussed. Recently, lignocellulosic biomass as the most abundant renewable resource has been widely considered for bioalcohols production. However, the complex structure of lignocelluloses requires a multi-step process which is costly and time consuming. Although, several bioprocessing approaches have been developed for pretreatment, saccharification and fermentation, bioalcohols production from lignocelluloses is still limited because of the economic infeasibility of these technologies. This cost constraint could be overcome by designing and constructing robust cellulolytic and bioalcohols producing microbes and by using them in a consolidated bioprocessing (CBP) system. This paper comprehensively reviews potentials, recent advances and challenges faced in CBP systems for efficient bioalcohols (ethanol and butanol) production from lignocellulosic and starchy biomass. The CBP strategies include using native single strains with cellulytic and alcohol production activities, microbial co-cultures containing both cellulytic and ethanologenic microorganisms, and genetic engineering of cellulytic microorganisms to be alcohol-producing or alcohol producing microorganisms to be cellulytic. Moreover, high-throughput techniques, such as metagenomics, metatranscriptomics, next generation sequencing and synthetic biology developed to explore novel microorganisms and powerful enzymes with high activity, thermostability and pH stability are also discussed. Currently, the CBP technology is in its infant stage, and ideal microorganisms and/or conditions at industrial scale are yet to be introduced. So, it is essential to bring into attention all barriers faced and take advantage of all the experiences gained to achieve a high-yield and low-cost CBP process.

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Production of ethanol 3G from Kappaphycus alvarezii: Evaluation of different process strategies

Cited by 87 publications

References 21 publications

Effect of Chemical Pre-treatments on Bioethanol Production from Chlorella minutissima

Effect of Chemical Pre-treatments on Bioethanol Production from Chlorella minutissima

<b>Optimized acid hydrolysis of the polysaccharides from the seaweed <i>Solieria filiformis</i> (Kützing) P.W. Gabrielson for bioethanol production

Advances in consolidated bioprocessing systems for bioethanol and butanol production from biomass: a comprehensive review

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