Two-stage acid saccharification of fractionated Gelidium amansii minimizing the sugar decomposition

Jeong, Tae Su; Kim, Young Soo; Oh, Kyeong Keun

doi:10.1016/j.biortech.2011.09.017

Cited by 33 publications

(20 citation statements)

References 42 publications

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“…Sugar content will drop if the H 2 SO 4 concentration exceeds 0,2 M. It will also cause monosaccharides, such as glucose and galactose that will degrade into hydroxymethylfurfural (HMF) and levulinic acid [5,12,25,]. HMF can also be degraded into levulinic acid if the acid concentration is above 1 M [12].…”

Section: Resultsmentioning

confidence: 99%

“…HMF and levulinic acid act as inhibitors in the fermentation process [5,12,13]. HMF and levulinic acid are known to impend cell growth and bioethanol production [12].…”

Section: Resultsmentioning

confidence: 99%

“…HMF and levulinic acid are known to impend cell growth and bioethanol production [12]. HMF has lower toxicity compared to levulinic acid [5]; [12] reported that 5 g/L of HMF and levulinic acid content will reduce cell growth as much as 27,2% and 63,6% respectively. The concentration limits of formic acid, Carbohydrates in these macroalgae species in the form of polysaccharides were agar and cellulose [6].…”

Section: Resultsmentioning

confidence: 99%

“…Hydrolysis of macroalgae can be done using enzymes or acid. Sulfuric acid can be used in hydrolysis (H 2 SO 4 ) since it can produce high levels of sugar [12]. Polysaccharide in red macroalgae can be hydrolyzed using low-concentrate sulfuric acid (H 2 SO 4 ) [5,13,14]).…”

Section: Introductionmentioning

confidence: 99%

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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%

“…HMF and levulinic acid act as inhibitors in the fermentation process [5,12,13]. HMF and levulinic acid are known to impend cell growth and bioethanol production [12].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimum Fermentation Process for Red Macroalgae Gelidium latifolium and Gracillaria verrucosa

Kawaroe

Sari

Hwangbo

et al. 2015

J. Eng. Technol. Sci.

View full text Add to dashboard Cite

show abstract

“…In the hydrolysis of G. amansii (a macroalgae) biomass, increasing sulfuric acid concentration from 3% to 4% resulted in sharp increases of glucose decomposition products such as 5-HMF, formic acid and levulinic acid by 23.6%, 64.7% and 51.2%, respectively while glucose yield decreased by 12.5% (Jeong et al, 2011).…”

Section: Effect Of Sulfuric Acid Concentrationmentioning

confidence: 99%