Dataset Information

Selective Conversion of Hemicellulose in Macroalgae Enteromorpha prolifera to Rhamnose.

ABSTRACT: Direct hydrothermal conversion (HC) of macroalgae Enteromorpha prolifera was conducted over the temperature range of 140-240 °C. At 160 °C, monosaccharides and small molecular acids began to generate. A high yield (18.8%) of monosaccharides was obtained at 180 °C, whereas 29.6% of small molecular organic acids was attained at 200 °C. Formic acid (FA) was then employed as a catalyst, which could selectively catalyze the conversion of hemicellulose at low temperature (94.1%, 140 °C). Rhamnose (45.2%) based on the mass of carbohydrates in E. prolifera was produced by the catalysis of 0.7 mL of FA (160 °C, 60 min, 1 g of biomass loading). A low ratio of biomass amount to water was beneficial to the solution of water-soluble components of hemicellulose in E. prolifera to get high yields to monosaccharides. HC showed promise to be an applicable and efficient method in the treatment of E. prolifera with high conversion of carbohydrates.

SUBMITTER: Zhang R

PROVIDER: S-EPMC6648841 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Publications

Selective Conversion of Hemicellulose in Macroalgae <i>Enteromorpha prolifera</i> to Rhamnose.

Zhang Rui R Chen Yaguang Y Zhou Yingdong Y Tong Dongmei D Hu Changwei C

ACS omega 20190418 4

Direct hydrothermal conversion (HC) of macroalgae <i>Enteromorpha prolifera</i> was conducted over the temperature range of 140-240 °C. At 160 °C, monosaccharides and small molecular acids began to generate. A high yield (18.8%) of monosaccharides was obtained at 180 °C, whereas 29.6% of small molecular organic acids was attained at 200 °C. Formic acid (FA) was then employed as a catalyst, which could selectively catalyze the conversion of hemicellulose at low temperature (94.1%, 140 °C). Rhamno ...[more]

PMID: 31459814

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Project description:BACKGROUND:Acetoin (3-hydroxy-2-butanone), the precursor of biofuel 2,3-butanediol, is an important bio-based platform chemical with wide applications. Fermenting the low-cost and renewable plant biomass is undoubtedly a promising strategy for acetoin production. Isothermal simultaneous saccharification and fermentation (SSF) is regarded as an efficient method for bioconversion of lignocellulosic biomass, in which the temperature optima fitting for both lignocellulose-degrading enzymes and microbial strains. RESULTS:A thermotolerant (up to 52 °C) acetoin producer Bacillus subtilis IPE5-4 which simultaneously consumed glucose and xylose was isolated and identified. By compound mutagenesis, the mutant IPE5-4-UD-4 with higher acetoin productivity was selected. When fermenting at 50 °C in a 5-L bioreactor using glucose as the feedstock by strain IPE5-4-UD-4, the acetoin concentration reached 28.83 ± 0.91 g L-1 with the acetoin yield and productivity of 0.34 g g-1 glucose and 0.60 g L-1 h-1, respectively. Furthermore, an optimized and thermophilic SSF process operating at 50 °C was conducted for acetoin production from alkali-pretreated corncob (APC). An acetoin concentration of 12.55 ± 0.28 g L-1 was achieved by strain IPE5-4-UD-4 in shake flask SSF, with the acetoin yield and productivity of 0.25 g g-1 APC and 0.17 g L-1 h-1. Meanwhile, the utilization of cellulose and hemicellulose in the SSF approach reached 96.34 and 93.29%, respectively. When further fermented at 50 °C in a 5-L bioreactor, the concentration of acetoin reached the maximum of 22.76 ± 1.16 g L-1, with the acetoin yield and productivity reaching, respectively, 0.46 g g-1 APC and 0.38 g L-1 h-1. This was by far the highest acetoin yield in SSF from lignocellulosic biomass. CONCLUSIONS:This thermophilic SSF process provided an efficient and economical route for acetoin production from lignocellulosic biomass at ideal temperature for both enzymatic hydrolysis and microbial fermentation.

Dataset Information

Selective Conversion of Hemicellulose in Macroalgae Enteromorpha prolifera to Rhamnose.

Publications

Selective Conversion of Hemicellulose in Macroalgae <i>Enteromorpha prolifera</i> to Rhamnose.

Similar Datasets

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