CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Chao Zhong,Chunming Wang,Fan Huang,Fengxue Wang,Honghua Jia,Hua Zhou,Ping Wei
A nanoscale catalyst, solid acid SO 4 2− /Fe 2 O 3 with both Lewis and Brønsted acidity was found to effectively hydrolyze hemicellulose while keeping cellulose and lignin inactive, and selective hydrolysis of hemicellulose from wheat straw by this catalyst was also confirmed. The factors that significantly affected hydrolysis process were investigated with response surface methodology, and the optimum conditions for time, temperature, and ratio of wheat straw to catalyst (w/w) were calculated to be 4.10 h, 141.97 °C, and 1.95:1, respectively. A maximum hemicellulose hydrolysis yield of 63.5% from wheat straw could be obtained under these conditions. In addition, the catalyst could be recycled six times with high activity remaining.
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高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 7
·4053-4060
·
IF 8.02
Jiang Deng,Tianyi Xiong,Fan Xu,Mingming Li,Chuanlong Han,Yutong Gong,Haiyan Wang,Yong Wang
Hierarchically porous carbons (HPCs) show great potential in energy storage due to their high surface area as well as short ion transport path derived from the interconnected porous framework. However, most existing protocols highly rely on nanocasting and soft-templating, which usually make the use of specific raw materials and thus their industrial application unfeasible. It still remains a big challenge to build HPCs from crude biomass, which is abundant on the earth, through a simple one-pot approach. Inspired by leavening of bread, we design a strategy to fabricate HPCs with three-dimensional (3D) hierarchical pores consisting of macro, meso, and micropores. The “leavening method” is conducted simply by mixing the biomass with KHCO3 followed by elevated temperature treatment. Besides the well-defined hierarchical structure, the as-prepared HPCs also exhibit notably large specific areas (up to 1893 m2 g−1). It is noteworthy that this “leavening” strategy is widely applicable to most of the biomass derivatives and biomass, including glucose, cellulose, chitin, starch, rice straw, bamboo, etc. When evaluated as supercapacitor electrode materials in two-electrode test systems, the as-prepared HPCs exhibit an excellent electrochemical performance: a specific capacitance of 253 F g−1, with almost no capacitance loss after 10 000 cycles.
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ADVANCED FUNCTIONAL MATERIALS
·
2015
·Vol. 25
·期 25
·3847-3854
·
IF 11.805
Xiangyang Zhu,Jinlou Gu,Junying Zhu,Yongsheng Li,Liming Zhao,Jianlin Shi
Introduction of accessible boronic acid functionality into metal–organic frameworks (MOFs) might to endow them with desired properties for potential applications in recognition and isolation of cis -diol containing biomolecules (CDBs). However, no investigation is found to address this topic until now. Herein, Cr-based MOFs of MIL-100 (MIL stands for Materials from Institut Lavoisier) integrated with different pendent boronic acid group (MIL-100-B) are reported. This new functional material is successfully prepared using a simple metal–ligand–fragment coassembly (MLFC) strategy with isostructure to the parent MIL-100 as verified by X-ray diffraction characterization. The integration and content tunability of the boronic acid group in the framework are confirmed by X-ray photoelectron spectroscopy and 11 B NMR. Transmission electron microscopy reveals that MIL-100-B can evolve into well-defined morphology and nanoscale size at optimized boronic acid incorporating level. The obtained MOFs exhibit comparable surface areas and pore volumes with parent MIL-100 and present exceptional chemical stability in a wide pH range. The inherent boronic acid components in MIL-100-B can effectively serve as the recognition units for the cis -diol moieties and consequently enhance the capture capabilities for CDBs. The exceptional chemical stability, high porosity, and good reusability as well as the intrinsic cis -diol moieties recognition function prefigure great potential of the current MIL-100-B in CDBs purification, sensing, and separation applications.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Xiao-ning Ye,Qiang Lu,Xin Wang,Hao-qiang Guo,Min-shu Cui,Chang-qing Dong,Yong-ping Yang
Activated carbon (AC) prepared by chemical activation with H3PO4 (named AC-P) was employed for catalytic fast pyrolysis of cellulose and biomass to selectively produce levoglucosenone (LGO). The catalytic pyrolysis behaviors and product distributions were revealed via both analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and lab-scale experiments. Moreover, the performance of AC-P catalyst was compared with previously reported strong acid catalysts and other ACs prepared by different activation methods. In addition, reusability and stability of the AC-P catalyst have been examined via recycling experiments. The results indicated that the AC-P catalyst was effective for selectively preparing LGO from both cellulose and biomass and performed better than other catalysts. Among the three biomass materials (pine wood, poplar wood, and bagasse), pine wood showed the best selectivity for producing LGO. The maximal LGO yields of 18.1 and 9.1 wt % were obtained from cellulose and pine wood, respectively, in Py-GC/MS experiments under a catalyst-to-feedstock ratio of 1:3 at 300 °C, whereas the lab-scale setup obtained the highest LGO yields of 14.7 and 7.8 wt % from cellulose and pine wood with selectivities of 76.3 and 43.0%, respectively, based on organic liquid products. Furthermore, granular AC-P catalyst exhibited good reusability and stability in the recycling experiments. Stable yields of LGO above 12.5 wt % from cellulose were obtained in six consecutive runs without any regeneration of the recycled granular AC-P catalyst.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Chun Chen,Qiang Huang,Li-Jun You,Xiong Fu
Three polysaccharides (MFP-1, MFP-2, and MFP-3) were fractioned from mulberry fruits with 30%, 60%, and 90% (v/v) ethanol, respectively. The MFP-1 had the largest molecular weight of 838 kDa, followed by MFP-2 from 49.5 to 163 kDa, and then MFP-3 from 1.41 to 15.30 kDa. The three polysaccharides were composed of arabinose, galactose, glucose, mannose, xylose, and galacturonic acid but with different molar ratio. They also exhibited different surface morphology and thermogravimetric properties. In addition, the impact of the three polysaccharides on the digestion of lipid in a simulated saliva and gastrointestinal tract was investigated. The results indicated MFP-2 had the strongest ability to reduce the rate and extent of lipid digestion. These results have important implications for understanding the influence of polysaccharides on lipid digestion. The effect on retarding lipid digestion within the gastrointestinal tract might be important for the development functional food rich in oil to promote health.
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高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Haizhou Lin,Jingping Chen,Yuan Zhao,Shurong Wang
To obtain an efficient and green reaction system for the production of furfural (FF), this study investigated the use of a SO3H-functionalized ionic liquid as a catalyst for the conversion of xylose in a solvent of renewable γ-valerolactone (GVL). A high FF yield of 78.12% was obtained in this reaction system catalyzed by 1-propylsulfonic-3-methylimidazolium chloride at 140 °C. The GVL remarkably enhanced the reaction rate and increased the xylose conversion and FF yield because the solvent effect of GVL could improve the catalytic activity of the acidic protons and suppress the side reactions. In addition, the ionic liquids showed satisfactory catalytic performance in the conversion of xylose to FF due to functionalization by introducing a SO3H group. The conversion of other C5 carbohydrates (arabinose and xylan) was also tested in this system, and moderate FF yields were achieved.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Shurong Wang,Haizhou Lin,Yuan Zhao,Jingping Chen,Jinsong Zhou
Humin, a solid by-product formed during the acid-catalyzed conversion of carbohydrate to platform chemicals, can be further utilized by pyrolysis technology. In this study, two humins derived from glucose (humin-g) and xylose (humin-x) were characterized by elemental analysis, FTIR and 13 C NMR. Both humins were polymers rich in furan rings, and their carbon contents were more than 66%. Thermogravimetry and pyrolysis kinetic analyses based on Flynn-Wall-Ozawa and Friedman methods suggested that the activation energies for both humins increased as their conversion rates increased. At low conversion rates, the activation energy of humin-x was higher than that of humin-g, but this was reversed at high conversion rates. The results suggest that humin-g has better thermal stability following the removal of weak linkages at low temperature. Finally, Py-GC/MS was employed to study the product distribution from humin pyrolysis. The mechanisms for formation of typical products and the influence of temperature on product distribution are discussed.
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Energy Science & Engineering
·
2017
·Vol. 5
·期 4
·208-216
·
IF 2.172
Yuan Zhao,Haizhou Lin,Shurong Wang
A novel green reaction system of CO 2 –water–isopropanol has been developed for the production of furfural (FF) from xylose. Initially, a simple CO 2 –water system was investigated, and the results showed that the formation of FF from xylose was greatly enhanced. CO 2 at high pressure could increase the acidity of the reaction system, and thus the FF yield was improved. By raising the reaction temperature, the conversion of xylose was remarkably accelerated in the CO 2 –water–isopropanol system, leading to an acceptable conversion rate (94.41%) and FF yield (55.81%). Addition of an appropriate amount of NaCl further increased the yield to 69.20%. Other carbohydrates (arabinose and xylan) were also tested in the same reaction system and modest results were obtained.
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FOOD HYDROCOLLOIDS
·
2016
·
IF 3.858
Chun Chen,Bin Zhang,Xiong Fu,Li-Jun You,Arshad Mehmood Abbasi,Rui Hai Liu
The digestibility of mulberry fruit polysaccharides (MFPs) and its effect on lipid digestion were investigated in the simulated saliva, gastric and intestinal model. Results showed that the saliva, especially the salivary amylase had no effect on MFPs, while the gastric juice had greater effects on the MFPs digestion than intestinal juice, which could be evidenced from the decrease in molecular weight (Mw) from 128.7 ± 6.1, 13.6 ± 1.4 and 2.9 ± 0.1 to 84.3 ± 4.7, 5.2 ± 0.1 and 1.2 ± 0.1 KDa, respectively. It was observed that the amount of reducing ends were increased from 0.051 ± 0.003 to 0.451 ± 0.011 mM and no monosaccharide was released from the polysaccharide during the whole digestion period, indicating that gastrointestinal digestion cleaves the glycosidic bonds and produces no free monosaccharide. In addition, under the simulated saliva, gastric and intestinal digestion conditions, MFPs could reduce the rate and extent of lipid digestion in a concentration-dependent manner. Our findings provide information on the digestibility of polysaccharides from Morus nigra L. in vitro .
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JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Yucui Hou,Jiahe Yan,Lixia Feng,Fan Xie,Weize Wu
Rice straw is a renewable, cheap, and abundant resource in agriculture. Due to its controllable and recoverable properties, H 2 O-SO 2 system was studied as a reaction medium to hydrolyze rice straw to produce chemicals by a two-step treatment. The first-step treatment converted hemicellulose to xylose (17.1%), glucose (3.1%) and arabinose (3.5%) at 140 °C. The second-step treatment converted cellulose to glucose (10.9%) at 190 °C. The total yield of products by the two-step treatment of rice straw was 41.1%, which is more than that in the one-step treatment (21.0% at 190 °C). The apparent activation energies for hemicellulose conversion and xylose dehydration were 76.7 and 66.9 kJ/mol, respectively. The degradation products obtained from the two-step treatment are less than that from the one-step treatment.
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CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Honghua Jia,Tingting Shao,Chao Zhong,Hengxiang Li,Min Jiang,Hua Zhou,Ping Wei
In this paper, we produced hemicellulosic hydrolysate from corncob by tetrabutylammonium hydroxide (TBAH) extraction and dilute acid hydrolysis combined, further evaluating the feasibility of the resultant corncob hemicellulosic hydrolysate used in xylitol production by Candida tropicalis . Optimized conditions for corncob hemicellulose extraction by TBAH was obtained via response surface methodology: time of 90 min, temperature of 60 °C, liquid/solid ratio of 12 (v/w), and TBAH concentration of 55%, resulting in a hemicellulose extraction of 80.07% under these conditions. The FT-IR spectrum of the extracted corncob hemicellulose is consistent with that of birchwood hemicellulose and exhibits specific absorbance of hemicelluloses at 1380, 1168, 1050, and 900 cm −1 . In addition, we found that C. tropicalis can ferment the resulting corncob hemicellulosic hydrolysate with pH adjustment and activated charcoal treatment leading to a high xylitol yield and productivity of 0.77 g/g and 2.45 g/(L h), respectively.
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高影响因子
PLANT FOODS FOR HUMAN NUTRITION
·
2016
·Vol. 71
·期 2
·123-128
·
IF 2.276
Ou Juan-ying,Huang Jun-qing,Song Yuan,Yao Sheng-wen,Peng Xi-chun,Wang Ming-fu,Ou Shi-yi
Corn bran is a byproduct produced from corn milling; it is rich in ferulic acid and hemicellulose. In this research, the effects of feruloylated oligosaccharides (FOs) from maize bran on the microbial diversity and profiles in rat feces were investigated through 16S rRNA sequencing. FOs significantly increased bacterial richness and diversity compared with the control and xylooligosaccharides (XOS) alone. In comparison with the control group and the group administrated with XOS, FOs orally administered at 300 mg/kg increased OTU in feces by 57.0 and 24.8 %, and Chao value by 93.4 and 37.6 %, respectively. FOs also influenced obesity- and diabetes-associated bacteria. Oral administration of FOs at 300 mg/kg decreased the ratio of Firmicutes to Bacteroidetes from 477.7:1 to 55.1:1; greatly increased the reads of bacteria that were previously found resistant against diabetes in rats, such as Actinobacteria , Bacteroides , and Lactobacillus ; whereas decreased diabetes-prone bacteria, such as Clostridium and Firmicutes .
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