An economic approach for l-(+) lactic acid fermentation by Lactobacillus amylophilus GV6 using inexpensive carbon and nitrogen sources

Altaf,; Venkateshwar, M.; Srijana, M.; Reddy, Gopal

doi:10.1111/j.1365-2672.2006.03254.x

Cited by 47 publications

(21 citation statements)

References 33 publications

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“…35 Commercially available fermentation plants of glucose to lactic acid also exist. 31,36 Th e third component, lignin, is composed of randomly branched phenylpropenyl (C9) units. Today, lignin is used as a source of heat and power for processing plants (especially in pulp and paper industries), and all its current commercial uses take advantage of its polymer and polyelectrolyte properties (as dispersants, emulsifi ers, binders, etc.).…”

Section: Lignocellulosic Biomass As Raw Materials Biomass Vs Fossil Rmentioning

confidence: 99%

Chemicals from lignocellulosic biomass: opportunities, perspectives, and potential of biorefinery systems

Cherubini

Strømman

2011

Biofuels Bioprod Bioref

162

101

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Most of the chemical products used today in our society originate from fossil sources through refi nery operations. The continual price increase of fossil resources, their uncertain availability, and the environmental concerns of their exploitation have led to a demand for the elaboration of alternative chemical production patterns based on renewable sources. Besides fossils, the only resource available for producing chemicals is biomass, and the establishment of biorefi nery complexes is increasingly perceived as a promising alternative to oil refi neries. This work is a position paper that provides an insight in the emerging biorefi nery concept, with special focus on the opportunities, perspectives, and potential regarding the use of lignocellulosic biomass as raw material in the preparation of platform chemicals needed to meet the existing demand. Results show that replacing fossil resources with wood requires large amounts of biomass and has several technological barriers that are still far from being overcome. This paper identifi es the key reactions where major effi ciency improvements and research efforts are needed (dehydration, fermentation, hydrogenation, etc.), as well as the possibilities when it comes to enhancing biomass conversion performances through the synthesis of new platform chemicals, with higher oxygen content, so as to accommodate the original biomass composition.

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Section: Lignocellulosic Biomass As Raw Materials Biomass Vs Fossil Rmentioning

confidence: 99%

Chemicals from lignocellulosic biomass: opportunities, perspectives, and potential of biorefinery systems

Cherubini

Strømman

2011

Biofuels Bioprod Bioref

162

101

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“…The strain of Lactobacillus amylophilus was known to be capable of producing extracellular amylase fermenting starchy materials directly to L(?) lactic acid under anaerobic conditions [2][3][4]. With starch as a sole substrate, the productivity obtained in the literature by anaerobic cultivation of L. amylophilus would be approximately 0.2-0.3 g/(l h) for a simple batch operation [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Lactic acid production directly from starch in a starch-controlled fed-batch operation using Lactobacillus amylophilus

Yen

Kang

2010

Bioprocess Biosyst Eng

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Based on the batch results, we constructed a simplified simultaneous saccharification and fermentation (SSF) model for the simulation of lactic acid production directly from unhydrolyzed potato starch using Lactobacillus amylophilus. The results of batch operation at different initial starch concentrations (20, 40 and 60 g/l) indicated that a higher initial starch concentration would lead to a slightly lower productivity, but would largely decrease the yield. Among that, the batch with 20 g/l of initial starch had the maximum productivity and the maximum yield, which would be 0.31 g/(l h) and 98% (g/g), respectively. In view of increasing the productivity and the final lactic acid concentration, a starch-controlled fed-batch operation with 20 g/l of initial starch was performed. It showed the fed-batch operation with starch controlled at 8 ± 1 g/l by adjusting the starch-feeding rate led to the maximum productivity of 0.75 g/(l h) and the yield of 69%.

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“…Using starch as carbon source can be handled in different ways: some lactic acid producing strains can convert starch to lactic acid without previous hydrolysis (direct fermentation) [23]; in some cases an enzymatic starch liquefaction step precedes fermentation to enhance the hydrolysis and then the strain's own gluco-amylase enzyme converts dextrins to glucose for lactic acid fermentation (Lactobacillus amylophilus [1,2,14], Lactobacillus amylovorus [4], Lactobacillus manihotivorans [13], Rhizopus oryzae [5,6]; most lactic acid bacteria (most of lactobacilli, lactococci etc.) need complete hydrolysis to glucose which can be performed by separate hydrolysis and fermentation (SHF) [25] or in line with fermentation (simultaneous saccharification and fermentation -SSF) [9,20,22]; the simultaneous saccharification and fermentation could be solved by co-fermentation as well by joint use of an amylolytic fungus and a lactic acid bacterium [24].…”

Section: Introductionmentioning

confidence: 99%

“…Michaelis constant of α-amylase depending on temperature (g L −1 ) K N Halfsaturation constant of nitrogen source (g L −1 ) k 1 growth associated constant of product formation according to Luedeking Piret k 2 non-growth associated constant of product formation according to Luedeking Piret (h −1 ) Y biomass yield on glucose (g g −1 ) Y N biomass yield on nitrogen source (g g −1 ) Y P product (LA) yield on glucose (g g −1 )…”

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confidence: 99%

Investigation and modeling of lactic acid fermentation on wheat starch via SSF, CHF and SHF technology

Hetényi¹,

Németh²,

Sevella³

2011

Per. Pol. Chem. Eng.

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Starch based lactic acid fermentation technology was examined and optimized using a non-amylolitic, mesophilic lactic acid bacterium. Comparing simultaneous saccharification and fermentation (SSF) and separate hydrolysis and fermentation (SHF) technologies several issues arose and applying the two techniques needed several compromises concerning the overall process time. A combined hydrolysis and fermentation method was developed which incorporate the advantages of SSF and SHF technologies: applying a time delay in inoculation and cutting down hydrolysis time before fermentation, an optimal inoculation and high efficiency was achieved by kinetic model aided experimental work. Experimental verification of the model gave an excellent productivity result: 4.32 g L −1 h −1 calculated with only the fermentation time, and 2.88 g L −1 h −1 calculated with the overall time of the two processes. With this method, hydrolysis and fermentation time was successfully reduced, enhancing lactic acid productivity and depressing production cost of this low-value chemical.

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An economic approach for l-(+) lactic acid fermentation by Lactobacillus amylophilus GV6 using inexpensive carbon and nitrogen sources

Cited by 47 publications

References 33 publications

Chemicals from lignocellulosic biomass: opportunities, perspectives, and potential of biorefinery systems

Chemicals from lignocellulosic biomass: opportunities, perspectives, and potential of biorefinery systems

Lactic acid production directly from starch in a starch-controlled fed-batch operation using Lactobacillus amylophilus

Investigation and modeling of lactic acid fermentation on wheat starch via SSF, CHF and SHF technology

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