Industrial Products ‐ the Return to Carbohydrate‐Based Industries

Louwrier, Ariel

doi:10.1111/j.1470-8744.1998.tb01368.x

Cited by 38 publications

(9 citation statements)

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“…However, at high chemical concentrations, dissolved D-xylose can be decomposed into furfural, thus resulting in a substantially lower total D-xylose yield. Besides, furfural is an undesirable end-product known to inhibit the fermentation process [17,18].…”

Section: Preliminary Resultsmentioning

confidence: 99%

Enhanced saccharification of rice straw using hypochlorite-hydrogen peroxide

Kang

Kim

et al. 2011

Biotechnol Bioproc E

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Rice straw is a lignocellulosic biomass, and has been recognized as a renewable organic substance and alternative energy source. In this study, rice straw was pretreated with hypochlorite-hydrogen peroxide (Ox-B) solution. The optimal pretreatment conditions were determined via response surface methodology, and the pretreated rice straw was hydrolyzed with exo-glucanase, endoglucanase, hemicellulase, and β-glucosidase Accellerase 1000™ (endo-glucanase equivalent activity of 1,250 carboxy methyl cellulose (CMC) U/g of rice straw pretreated for 24 h). The optimal conditions were as follows: 60 min pretreatment using Ox-B solution containing 0.6% hypochlorite and 25% hydrogen peroxide for 1 g of rice straw in a total reaction volume of 240 mL. Under these conditions, 406.8 mg of D-glucose and 224.0 mg of D-xylose were obtained from 1 g of rice straw. The fermentation of enzymatic hydrolysates containing 8.14 g/L D-glucose and 4.49 g/L D-xylose with Pichia stipitis generated 3.65 g/L of ethanol with a corresponding yield of 0.37 g/g. The maximum possible ethanol conversion rate is 72.54%.

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Section: Preliminary Resultsmentioning

confidence: 99%

Enhanced saccharification of rice straw using hypochlorite-hydrogen peroxide

Kang

Kim

et al. 2011

Biotechnol Bioproc E

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“…Ecological problems resulting from the accumulation of lignocellulosics on the ground could be avoided if these raw materials were properly utilized. In fact, they are an abundant and inexpensive source of carbon compounds that may be exploited for the production of several high-value chemicals (1), among which xylitol (2,3). Xylitol is an alternative sweetener used industrially in foods and odontological/pharmaceutical preparations (4,5), whose application in the prevention of diseases is under investigation as well (6).…”

Section: Introductionmentioning

confidence: 99%

Xylitol Production from Sugarcane Bagasse Hydrolyzate in Fluidized Bed Reactor. Effect of Air Flowrate

Santos¹,

Carvalho²,

Silva³

et al. 2008

Biotechnol Progress

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Cells of Candida guilliermondii immobilized onto porous glass spheres were cultured batchwise in a fluidized bed bioreactor for xylitol production from sugarcane bagasse hemicellulose hydrolyzate. An aeration rate of only 25 mL/min ensured minimum yields of xylose consumption (0.60) and biomass production (0.14 g(DM)/g(Xyl)), as well as maximum xylitol yield (0.54 g(Xyt)/g(Xyl)) and ratio of immobilized to total cells (0.83). These results suggest that cell metabolism, although slow because of oxygen limitation, was mainly addressed to xylitol production. A progressive increase in the aeration rate up to 140 mL/min accelerated both xylose consumption (from 0.36 to 0.78 g(Xyl)/L.h) and xylitol formation (from 0.19 to 0.28 g(Xyt)/L.h) but caused the fraction of immobilized to total cells and the xylitol yield to decrease up to 0.22 and 0.36 g(Xyt)/g(Xyl), respectively. The highest xylitol concentration (17.0 g(Xyt)/L) was obtained at 70 mL/min, but the specific xylitol productivity and the xylitol yield were 43% and 22% lower than the corresponding values obtained at the lowest air flowrate, respectively. The concentrations of consumed substrates and formed products were used in material balances to evaluate the xylose fractions consumed by C. guilliermondii for xylitol production, complete oxidation through the hexose monophosphate shunt, and cell growth. The experimental data collected at variable oxygen level allowed estimating a P/O ratio of 1.35 mol(ATP)/mol(O) and overall ATP requirements for biomass growth and maintenance of 3.4 mol(ATP)/C-mol(DM).

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“…[1][2][3][4][5] They find applications in research and development 1,2,6-8 and are widely used in industrial processes. 9,10 Glycosidases and glycosyltransferases find use in the synthesis of glycosides and oligosaccharides, whereas oxidoreductases, lyases, and ligases are basically applied to modify monosaccharides. 1,2,11,12 Such broad range of applications implies a general interest to understand molecular foundations of these diverse catalytic processes.…”

Section: Introductionmentioning

confidence: 99%