Brown algae hydrolysis in 1-n-butyl-3-methylimidazolium chloride with mineral acid catalyst system

Malihan, Lenny B.; Nisola, Grace M.; Chung, Wook-Jin

doi:10.1016/j.biortech.2012.05.091

Cited by 32 publications

(24 citation statements)

References 25 publications

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“…The acid‐catalysed hydrolysis of red macroalgae is similar to that of brown algae wherein algal polymers such as agarose and cellulose are broken down into their monomeric sugars and further degraded into formic acid and levulinic acid. It was previously observed that sugar degradation is enhanced at prolonged reaction time . In Fig.…”

Section: Resultsmentioning

confidence: 92%

“…The formation of 5‐HMF increased steadily and decreased at T > 120 °C due to the formation of re‐hydration products such as formic and levulinic acid. The decreased selectivity for sugar formation when the temperature is increased has also been observed in IL pretreatment of brown macroalgae . Hence, a reaction temperature of 120 °C was selected as the optimum condition for the hydrolysis of G. amansii in DAILs.…”

Section: Resultsmentioning

confidence: 99%

“…It was previously observed that sugar degradation is enhanced at prolonged reaction time. 7,8 In Fig. 5, it can be seen that sugar yields decrease after attaining a maximum value at 3 min and 5 min for DAILS connected by short and long oligo-ether chains, respectively.…”

Section: Acidity Of Dailsmentioning

confidence: 95%

“…Recently, environmentally benign ionic liquids (ILs) have been popularly used as effective solvents for biomass as well as in acid‐catalyzed hydrolysis of lignocellulosic biomass and macroalgae. Hydrolysis rates in IL environments can occur more rapidly in homogeneous biomass/IL systems than in heterogeneous biomass/acidic aqueous systems . Meanwhile, task specific ILs with dual properties (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Macroalgal biomass hydrolysis using dicationic acidic ionic liquids

Malihan

Mittal

Nisola

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND Macroalgae has high potential as a bio‐fuel feedstock due to its high carbohydrate content. Conventional aqueous systems require a huge amount of energy to catalyze depolymerization and hydrolysis of macroalgae. Recently various task‐specific ionic liquids (ILs) successfully depolymerized different biomasses, but were thermally unstable. A variety of dicationic acidic ILs (DAILs) connected by oligo‐ethylene glycol (EG) chains bearing hydrogen sulfate (HSO4−) anions were synthesized with better thermal stability and utilized in hydrolysis of macroalgal biomass, Gelidium amansii. RESULTS The structures of DAILs were confirmed by 1H and 13C NMR as well as FT‐IR. EG‐linker chain lengths and dicationic structure increased the thermal stability of DAILs and influenced their catalytic performance for G. amansii hydrolysis. DAILs linked with short oligo‐EG chains afforded higher sugar yields and exhibited faster hydrolysis rates compared with those linked by long oligo‐EG chains (i.e. PEG400 and PEG600). A maximum sugar yield of 67.45 wt% was recovered from G. amansii using [Tri‐EG‐(MIm)2] 2HSO4 DAIL, after 3 min at 120 °C. CONCLUSION The synthesized DAILs showed dual properties as catalyst and reaction medium for hydrolysis of macroalgae in solvent‐less conditions. Shorter oligo‐EG chain linked DAILs exhibited faster reaction rates with higher sugar yields. © 2016 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Acidity Of Dailsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Macroalgal biomass hydrolysis using dicationic acidic ionic liquids

Malihan

Mittal

Nisola

et al. 2016

J of Chemical Tech & Biotech

Self Cite

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“…15 According to a report, the optimum bioethanol productivity from algae can be approximately twice higher than ethanol productivity from sugarcane and 5 times higher than that from corn. 16 Brown algae contain about 30-67 % carbohydrate by dry weight, and the main components of polysaccharides are alginate, laminaran, and mannitol.…”

Section: Introductionmentioning

confidence: 99%

The Isolation and Performance Studies of an Alginate Degrading and Ethanol Producing Strain

Zhang

Cui

2014

Chem.Biochem.Eng.Q.

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Bioethanol production from brown algae is a promising way to help solve the energy problem. Alginate is a major component of brown algae, but it cannot be utilized for ethanol fermentation. In order to improve the utilization rate of algae, high alginate fermentation strains should be obtained. In this research, alginate fermentations were carried out and 6 alginate degrading strains were obtained from different samples. The ethanol yield of strain 5 was the highest, which was 0.154 g g -1 (ethanol to alginate). Identification of strain 5 revealed that it was 99 % identical to Meyerozyma guilliermondii. The transform procedure from alginate to ethanol by M. guilliermondii was studied. The crude enzymes of alginate lyase and ethanol dehydrogenase were extracted, and the enzyme activity was measured. The main polysaccharides of brown algae are alginate, laminaran and mannitol. So the fermentation experiments were carried out with different substrates, such as laminaran, mannitol, Laminaria japonica and acid hydrolysate of L. japonica. The ethanol yield rate of L. japonica was the highest, reaching 0.237 g g -1 ethanol to L. japonica. This showed that strain 5 might be a promising strain for ethanol production from algae.

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Recent advances in the metabolic engineering of microorganisms for the production of 3-hydroxypropionic acid as C3 platform chemical

Chung

Liu

Nisola

et al. 2013

Appl Microbiol Biotechnol

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Development of sustainable technologies for the production of 3-hydroxypropionic acid (3HP) as a platform chemical has recently been gaining much attention owing to its versatility in applications for the synthesis of other specialty chemicals. Several proposed biological synthesis routes and strategies for producing 3HP from glucose and glycerol are reviewed presently. Ten proposed routes for 3HP production from glucose are described and one of which was recently constructed successfully in Escherichia coli with malonyl-Coenzyme A as a precursor. This resulted in a yield still far from the required level for industrial application. On the other hand, strategies employing engineered E. coli and Klebsiella pneumoniae capable of producing 3HP from glycerol are also evaluated. The titers produced by these recombinant strains reached around 3 %. At its current state, it is evident that a bulk of engineering works is yet to be done to acquire a biosynthesis route for 3HP that is acceptable for industrial-scale production.

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Brown algae hydrolysis in 1-n-butyl-3-methylimidazolium chloride with mineral acid catalyst system

Cited by 32 publications

References 25 publications

Macroalgal biomass hydrolysis using dicationic acidic ionic liquids

Macroalgal biomass hydrolysis using dicationic acidic ionic liquids

The Isolation and Performance Studies of an Alginate Degrading and Ethanol Producing Strain

Recent advances in the metabolic engineering of microorganisms for the production of 3-hydroxypropionic acid as C3 platform chemical

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