Production of lactic acid from hemicellulose extracts by Bacillus coagulans MXL-9

Walton, Sara; Bischoff, Kenneth M.; Heiningen, A. R. P. Van; Walsum, G. Peter van

doi:10.1007/s10295-010-0727-4

Cited by 65 publications

(47 citation statements)

References 23 publications

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“…The concentration of Green Liquor used in this study (3% Na 2 O equivalent on wood) was chosen because it had been previously demonstrated to preserve the quantity and quality of the Kraft pulp that could be produced with the wood solids remaining after extraction [12]. Higher concentrations of Green Liquor have been shown to result in lower carbohydrate concentrations in the liquor, while lower Green Liquor concentrations tend to yield more sugars but degraded pulp quality and quantity [13].…”

Section: Extractionmentioning

confidence: 99%

Acid Hydrolysis of Hemicellulose in Green Liquor Pre-Pulping Extract of Mixed Northern Hardwoods

Walsum

2009

Appl Biochem Biotechnol

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Forest biomass is a promising resource for future biofuels and bioproducts. Pre-pulping extraction of hemicellulose by alkaline (Green Liquor) pretreatment produces a neutral-pH extract containing hemicellulose-derived oligomers. A near-term option for use of this extract is to hydrolyze the oligomers to fermentable monomer sugars. Chips of mixed northern hardwoods were cooked in a rocking digester at 160 degrees C for 110 min in Green Liquor at a concentration of 3% Na2O equivalent salts on dry wood. The mass of wood extracted into the Green Liquor extract was approximately 11.4% of the debarked wood mass, which resulted in a dilute solution of oligomeric hemicelluloses sugars. The concentration of the extract was increased through partial evaporation prior to hydrolysis. Dilute sulfuric acid hydrolysis was applied at conditions ranging from 100 to 160 degrees C, 2% to 6% (w/v) H2SO4, and 2- to 258-min residence time. The maximum fermentable sugar concentration achieved from evaporated extract was 10.7 g/L, representing 90.7% of the maximum possible yield. Application of the biomass pretreatment severity function to the hydrolysis results proved to offer a relatively poor prediction of temperature and reaction time interaction. The combined severity function, which incorporates reaction time, temperature, and acid concentration, did prove to provide a useful means of trading off the combined effects of these three variables on total sugar yields.

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Section: Extractionmentioning

confidence: 99%

Acid Hydrolysis of Hemicellulose in Green Liquor Pre-Pulping Extract of Mixed Northern Hardwoods

Walsum

2009

Appl Biochem Biotechnol

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“…The moderately thermophilic Bacillus coagulans MXL-9 (described in detail below), has been used to ferment a several hot water hydrolysates. For example, larch extracts composed of 45.8 g total sugars l -1 was converted to 40.5 g lactic acid l -1 after 50 h (Walton et al 2010). These cells consumed the glucose and mannose first, after which the remaining sugars were metabolized.…”

Section: Conversion Of Lignocellulosic Hydrolysates To Lactic Acidmentioning

confidence: 99%

Microbial production of lactic acid

Eiteman

Ramalingam

2015

Biotechnol Lett

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Lactic acid is an important commodity chemical having a wide range of applications. Microbial production effectively competes with chemical synthesis methods because biochemical synthesis permits the generation of either one of the two enantiomers with high optical purity at high yield and titer, a result which is particularly beneficial for the production of poly(lactic acid) polymers having specific properties. The commercial viability of microbial lactic acid production relies on utilization of inexpensive carbon substrates derived from agricultural or waste resources. Therefore, optimal lactic acid formation requires an understanding and engineering of both the competing pathways involved in carbohydrate metabolism, as well as pathways leading to potential by-products which both affect product yield. Recent research leverages those biochemical pathways, while researchers also continue to seek strains with improved tolerance and ability to perform under desirable industrial conditions, for example, of pH and temperature.

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“…was the most abundant followed by Bacillus sp. The bacterial species C. thermopalmarium, C. thermobutyricum, and B. ginsengihumi were previously reported as potential hydrogen producing bacteria ( Wiegel et al, 1989;Geng et al, 2010;Walton et al, 2010). Clostridium Sp., a low G+ C content bacterium, is known to generate hydrogen along with butyrate and acetate as major SMPs (Chen et al, 2002;Levin et al, 2004).…”

Section: Microbial Community Patternmentioning

confidence: 99%

“…Moreover, Bacillus sp. was also reported to produce lactic acid from hemicellulose extracts (Walton et al, 2010). The inoculum source i.e.…”

Section: Microbial Community Patternmentioning

confidence: 99%

Improved microbial conversion of de-oiled Jatropha waste into biohydrogen via inoculum pretreatment: process optimization by experimental design approach

et al. 2015

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Improved microbial conversion of de-oiled Jatropha waste into biohydrogen via inoculum pretreatment: process optimization by experimental design approach In this study various pretreatment methods of sewage sludge inoculum and the statistical process optimization of de-oiled jatropha waste have been reported. Peak hydrogen production rate (HPR) and hydrogen yield (HY) of 0.36 L H2/L-d and 20 mL H2/g Volatile Solid (VS) were obtained when heat shock pretreatment (95 o C, 30 min) was employed. Afterwards, an experimental design was applied to find the optimal conditions for H2 production using heat-pretreated seed culture. The optimal substrate concentration, pH and temperature were determined by using response surface methodology as 205 g/L, 6.53 and 55.1 o C, respectively. Under these circumstances, the highest HPR of 1.36 L H2/L-d was predicted. Verification tests proved the reliability of the statistical approach. As a result of the heat pretreatment and fermentation optimization, a significant (~ 4 folds) increase in HPR was achieved. PCR-DGGE results revealed that Clostridium sp. were majorly present under the optimal conditions. Kumar et al. / Biofuel Research Journal 5 (2015) 209-214 Please cite this article as: Kumar G., Bakonyi P., Sivagurunathan P., Nemestóthy N., Bélafi-Bakó K., Lin C.Y. Improved microbial conversion of de-oiled Jatropha waste into biohydrogen via inoculum pretreatment and process optimization by experimental design approach. Biofuel Research Journal 5 (2015) 209-214.

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Production of lactic acid from hemicellulose extracts by Bacillus coagulans MXL-9

Cited by 65 publications

References 23 publications

Acid Hydrolysis of Hemicellulose in Green Liquor Pre-Pulping Extract of Mixed Northern Hardwoods

Acid Hydrolysis of Hemicellulose in Green Liquor Pre-Pulping Extract of Mixed Northern Hardwoods

Microbial production of lactic acid

Improved microbial conversion of de-oiled Jatropha waste into biohydrogen via inoculum pretreatment: process optimization by experimental design approach

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