Bioethanol production from Gracilaria verrucosa, a red alga, in a biorefinery approach

Kumar, Shiv; Gupta, Rishi; Kumar, Gaurav; Sahoo, Dinabandhu; Kuhad, Ramesh Chander

doi:10.1016/j.biortech.2012.10.120

Cited by 260 publications

(113 citation statements)

References 25 publications

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“…and Glacilaria sp. is mainly agar [19,6]. Agar is a complex linear polysaccharide that has a molecular weight of 120.000 dalton and consists of several types of polysaccharides: 3,6-anhydro-L-galactose, D-galactopiranosa, and a trace amount of methyl D-galactose [6].…”

Section: Resultsmentioning

confidence: 99%

Optimum Fermentation Process for Red Macroalgae Gelidium latifolium and Gracillaria verrucosa

Kawaroe

Sari

Hwangbo

et al. 2015

J. Eng. Technol. Sci.

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Abstract. Red macroalgae have the potential to be processed into bioethanol due to their high carbohydrate and low lignin content. Gelidium latifolium and Gracilaria verrucosa are red macroalgae commonly found in Indonesian seas. Sometimes an over-supply of red macroalgae is rejected by the food industry, which opens up opportunities for others uses, e.g. for producing bioethanol. The objectives of this research were to analyze the influence of sulfuric acid concentration on hydrolysis of G. latifolium and G. verrucosa and to calculate the optimum fermentation process to produce bioethanol. G. latifolium and G. verrucosa were hydrolyzed using H 2 SO 4 at concentrations of 1%, 2%, 3%, and 4%, at a temperature of 121 °C and a pressure of 1.5 bar for 45 minutes. The process of fermentation was done using Saccharomyces cerevisiae in anaerobic conditions for 4, 5, 6 and 7 days. The results show that the optimum H 2 SO 4 concentrations to hydrolyze G. latifolium and G. verrucosa were 1% and 2% respectively. The number of S. cerevisiae cells in hydrolysate G. latifolium and G. verrucosa increased in the third adaptation. S. cerevisiae can convert sugar from G. latifolium and G. verrucosa into bioethanol through fermentation. The highest bioethanol yields were achieved on days five and six. Therefore, red macroalgae can be seen as a potential raw material for bioethanol production.

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Section: Resultsmentioning

confidence: 99%

Optimum Fermentation Process for Red Macroalgae Gelidium latifolium and Gracillaria verrucosa

Kawaroe

Sari

Hwangbo

et al. 2015

J. Eng. Technol. Sci.

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“…Moreover, further increment in reducing sugar release after 45 min incubation was almost negligible for P. tetrastromatica. Generally, reducing sugar yield was monitored at this stage with DNS reagent (Kumar et al 2013;Nitin et al 2013;Myra et al 2013) which also reacts with furfurals due to the presence of intact reducing groups and the estimated reducing sugar yield is the combination of simple sugars and their furfurals. The possibility of simple sugar to furfural conversion generally increases with the increase in acid concentration as well as reaction time at high temperatures (Oscar and Carlos 2009).…”

Section: Optimization Of Pretreatment Conditionsmentioning

confidence: 99%

“…Having a long sea coast, India had crossed 600,000 tons (wet weight) production of sea weeds (Sajid and Satam 2003). The macroalgae studied hitherto for ethanol production include Laminaria (Adams et al 2009;Ge et al 2011;Horn et al 2000;Kim et al 2011), Gelidium amansii (Yoon et al 2010), Sacchoriza and Alaria (Yeon et al 2010), Gracilaria salicornia , G. verrucosa (Kumar et al 2013), Kappaphycus alvarezii (Khambhaty et al 2012;Meinita et al 2012;Xiaolin et al 2014) and Ulva fasciata (Nitin et al 2013). …”

Section: Introductionmentioning

confidence: 99%

Ethanol Production from the Biomass of Two Marine Algae, Padina tetrastromatica and Sargassum vulgare

Durbha¹,

Santosh²,

Guntuku³

et al. 2016

AJBB

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Macroalgae were identified as third generation carbon source for bioethanol production and possess several advantages over terrestrial biomass. Hence, two common seaweeds, P. tetrastromatica and S. vulgare have been evaluated as substrates for ethanol production. They were collected from coast of the Bay of Bengal at Visakhapatnam, Andhra Pradesh, India. Samples were cleaned, dried and crushed to powder which were subjected to separate treatments with dilute sulphuric acid, sodium hydroxide and a combination of both. Based on the quantities of sugars released from these treatments, pretreatment with 1% and 2% v/v sulphuric acid for 45 min at 121˚C were chosen for P. tetrastromatica and S. vulgare respectively and the quantities of sugars released were 0.32 and 0.44 g/g. The resulting hydrolyzates were detoxified by sequential treatment with ethyl acetate and calcium oxide and were then fermented employing Saccharomyces cerevisiae strain R3DSC5 which was deposited at IMTECH, India, with accession number MTCC 12377. Ethanol yield obtained with P. tetrastromatica (0.66 g/g) during the present work is more than the highest yield (0.45 g/g) reported so far for any marine algal biomass while that obtained with S. vulgare (0.38 g/g) is on par with the highest yield (0.386 g/g) reported for other species of Sargassum. This study shows that both the seaweeds are potential sources for bioethanol production and of the two, P. tetrastromatica is better.

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“…The major advantages offered by marine macroalgae over terrestrial plants are: (1) no competing with conventional agricultural plants for land, and utilization of different water sources (seawater, brackish water, and wastewater), (2) high area productivity, (3) non-dependence on agricultural input (fertilizer, pesticides, etc. ), (4) being hydrolyzed easily into glucose as they contain lower lignin content in the cell wall [10,11], and (5) easier harvesting as their plant-like characteristics [12]. All of those features enable macroalgae to become a very promising biofuel feedstock for the future.…”

Section: Introductionmentioning

confidence: 99%

Prospects for Bioethanol Production from Macroalgae

Chen

Bai

et al. 2015

Tr Ren Energy

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Bioethanol production from Gracilaria verrucosa, a red alga, in a biorefinery approach

Cited by 260 publications

References 25 publications

Optimum Fermentation Process for Red Macroalgae Gelidium latifolium and Gracillaria verrucosa

Optimum Fermentation Process for Red Macroalgae Gelidium latifolium and Gracillaria verrucosa

Ethanol Production from the Biomass of Two Marine Algae, Padina tetrastromatica and Sargassum vulgare

Prospects for Bioethanol Production from Macroalgae

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