JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2016
·
IF 2.857
Chun Liu,Fenfen Cheng,Yingen Sun,Hongyu Ma,Xiaoquan Yang
An alkaline isoform of the PR-5 protein (designated GmOLPc) has been purified from soybean hulls and identified by MALDI-TOF/TOF-MS. GmOLPc effectively inhibited in vitro the growth of Phytophthora soja spore and Pseudomonas syringae pv glycinea. The antimicrobial activity of GmOLPc should be mainly ascribed to its high binding affinity with vesicles composed of DPPG, (1,3)-β-d-glucans, and weak endo-(1,3)-β-d-glucanase activity. From the 3D models, predicted by the homology modeling, GmOLPc contains an extended negatively charged cleft. The cleft was proved to be a prerequisite for endo-(1,3)-β-d-glucanase activity. Molecular docking revealed that the positioning of linear (1,3)-β-d-glucans in the cleft of GmOLPc allowed an interaction with Glu83 and Asp101 that were responsible for the hydrolytic cleavage of glucans. Interactions of GmOLPc with model membranes indicated that GmOLPc possesses good surface activity which could contribute to its antimicrobial activity, as proved by the behavior of perturbing the integrity of membranes through surface hydrophobic amino acid residues (Phe89 and Phe94).
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Huiyong Wang,Shuyan Liu,Yuling Zhao,Hucheng Zhang,Jianji Wang
Ionic liquids (ILs) have shown superior performance in the conversion of biomass to 5-hydroxymethylfurfural (5-HMF) as reaction medium and/or catalyst, which is a green platform compound with a wide range of applications in manufacturing fine chemicals and biofuels. Nevertheless, the separation of 5-HMF from ILs is very difficult and becomes a technical bottleneck for IL application in the preparation of 5-HMF. To resolve this problem, understanding the interactions between ILs and 5-HMF is essential. In this work, attenuated total reflectance Fourier transform infrared, 1H nuclear magnetic resonance, and quantum chemistry calculations were combined to investigate the interaction between 5-HMF and each of the eight ILs over the whole composition range. The studied ILs have the same 1-butyl-3-methylimidazolium cation [C4mim]+ but different anions. It was found that interactions between the ILs and 5-HMF were mainly ascribed to the strong hydrogen bonds of 5-HMF with anions of the ILs, and the formation abilities of hydrogen bonds of the anions with O–H group of 5-HMF were found to decrease in the order [CH3COO]−, [C2H5COO]− > [HSO4]− > [CF3COO]− > [N(CN)2]− > [NO3]− > [CH3OSO3]− > [BF4]−. These results suggest that the anions with stronger hydrogen bond accepting ability have stronger interaction with 5-HMF and the separation of 5-HMF from the ILs is mainly governed by the hydrogen bonding interactions between anion of the ILs and 5-HMF. In addition, partition coefficients of 5-HMF between 1,4-dioxane and the ILs phases were determined experimentally to support the conclusion.
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高影响因子
AICHE JOURNAL
·
2016
·Vol. 63
·期 1
·257-265
·
IF 2.98
Haizhou Lin,Qingang Xiong,Yuan Zhao,Jingping Chen,Shurong Wang
In this work, a green reaction system of CO 2 -water-isopropanol was developed for 5-hydroxymethylfurfural (HMF) production. The conversion of fructose in a CO 2 -water system was first investigated, and the results showed this system could promote the formation of HMF compared to a pure water system. Then, isopropanol was introduced into the CO 2 -water system and the HMF formation became better because the solvent effect of isopropanol increased the tautomeric composition of fructofuranose, which was easy to form HMF. The existence of isopropanol was found to greatly suppress secondary reactions where HMF was converted to levulinic acid and insoluble humin. Meanwhile, the effects of reaction parameters on the conversion of fructose to HMF in the CO 2 -water-isopropanol system were analyzed, and a high HMF yield of 67.14% was obtained. Finally, to further illustrate the merits of CO 2 -water-isopropanol system, productions of HMF from other carbohydrates were tested and satisfactory yields were achieved. © 2016 American Institute of Chemical Engineers AIChE J , 63: 257–265, 2017
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 89
·86034-86042
·
IF 3.289
Lujiang Xu,Qian Yao,Ying Zhang,Yao Fu
In this study, nano-sized HZSM-5 catalysts with different Si/Al ratios were synthesized and employed for producing pyridines from glycerol via a thermo-catalytic conversion and ammonization (TCC-A) process. The catalytic performance of micro-sized HZSM-5 and nano-sized HZSM-5 was studied firstly. The nano-sized HZSM-5 showed better catalytic performance in pyridine production in the TCC-A process due to its smaller particle size. When the nano-sized HZSM-5 (Si/Al = 25) served as the catalyst, and the reaction temperature was about 550 °C with the weight hourly space velocity of glycerol to catalyst at 1 h−1 and the ammonia to glycerol ratio at 12 : 1, the highest yield of pyridines was up to 42.1%, which was much higher than that when using micro-sized HZSM-5 (35.6%) reported before. In addition, nano-sized HZSM-5 also showed a better catalytic performance than micro-sized HZSM-5 in the catalytic conversion of bio-derived furans to produce indoles. After five reaction/regeneration cycles, the catalytic performance of nano-sized HZSM-5 slightly decreased compared with the first run, but was still higher than that of micro-sized HZSM-5.
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高影响因子
Waste and Biomass Valorization
·
2016
·Vol. 8
·期 4
·1303-1311
·
IF 0.915
Wei W. Q.,Wu S. B.
Conversion of eucalyptus cellulose into 5-hydroxymethylfurfural (5-HMF) by using Lewis acid catalyst in biphasic system was investigated in this study. The results show that the tetrahydrofuran/water biphasic system was more conducive to convert the eucalyptus cellulose into 5-HMF comparing to the single aqueous system. InCl 3 , a water-compatible Lewis acid, has the best catalytic effect. The highest yield of 5-HMF from eucalyptus cellulose is up to 45.05 mol%, which is a slight higher than that from microcrystalline cellulose. It can be ascribed to the lower crystallinity of isolated eucalyptus cellulose. The optimum conditions for catalytic conversion of eucalyptus cellulose into 5-HMF are at 200 °C for 2 h with 10 % InCl 3 dosage. Additionally, the effect of recycling the whole biphasic system which contains InCl 3 , NaCl, H 2 O and THF indicated that the 5-HMF yield was gradually decreased as the cycle times increased, the possible reason could be due to the loss of partial InCl 3 catalyst during the separation and distillation process.
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高影响因子
NANO
·
2016
·
IF 0.951
Wei Li,Gang Ni,Jing Li,Ying Han
BiOI/HZSM-5 composites were synthesized via a facile and environmentally-benign hydrothermal method. The crystalline structures and morphologies of the powder have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of samples was tested for degradation of methylene blue (MB) and Rhodamine B (RhB) dye under simulated solar light irradiation. The degradation rate of MB and RhB by BiOI/HZSM-5 composite photocatalysts respective reach 99.6% and 98.6% under visible light irradiation, BiOI/HZSM-5 exhibited the highest photocatalytic performance when compared with pure BiOI.
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高影响因子
Particuology
·
2017
·
IF 2.621
Rongjie Ling,Wu Chen,Jin Hou
Modified nanosized MFI (ZSM-5 and silicalite-1) zeolites were successfully synthesized by a hydrothermal method using aluminum isopropoxide and tetraethylorthosilicate as the raw materials. The synthetic zeolites were characterized by X-ray diffraction, energy dispersion spectroscopy, and scanning electron microscopy. The ZSM-5 and silicalite-1 zeolites exhibited ellipse-like and cubic columns, respectively. The K + ion-exchange equilibrium and ion-exchange capacity of the synthetic zeolites in seawater were investigated. The K + ion-exchange of synthetic zeolites was rapid and reached an ion-exchange balance in approximately 20 min. The K + ion-exchange capacity of ZSM-5 and silicalite-1 in seawater was 56.7 and 48.7 mg/g, respectively. The synthetic zeolites have high selectivity toward K + , and therefore, they can be used to selectively extract potassium from seawater.
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高影响因子
ACS Catalysis
·
2016
·
IF 9.307
Da Lei,Kai Yu,Meng-Ru Li,Yuling Wang,Qi Wang,Tong Liu,Pengkun Liu,Lan-Lan Lou,Guichang Wang,Shuangxi Liu
Single-crystalline Pd nanocrystals enclosed by {111} or {100} facets with controllable sizes were synthesized and originally employed as catalysts in the aerobic oxidation of 5-hydroxymethyl-2-furfural (HMF). The experimental results indicated that the particle size and exposed facet of Pd nanocrystals could obviously influence their catalytic performance. The size-dependent effect of Pd nanocrystals in this reaction could only be derived from the different Pd dispersions. Therefore, the facet effect of Pd nanocrystals was first investigated in this work through experimental and theoretical approaches. It was found that Pd-NOs enclosed by {111} facets were more efficient than Pd-NCs enclosed by {100} facets for the aerobic oxidation of HMF, especially for the oxidation step from 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) toward 5-formyl-2-furancarboxylic acid (FFCA). The TOF value of Pd-NOs(6 nm) was 2.6 times as high as that of Pd-NCs(7 nm) and 5.2 times higher than that of commercial Pd/C catalyst for HMF oxidation. Through density functional theory (DFT) calculations, the notably enhanced catalytic performance of Pd-NOs could be mainly attributed to the lower energy barrier in the alcohol oxidation step (from HMFCA to FFCA) and higher selectivity for O2 hydrogenation to produce peroxide.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Fang Jin,Xianqiao Wang,Tieliang Liu,Linbo Xiao,Ming Yuan,Yangchun Fan
A new effective process to improve the utilization of industrial fluorosilicic acid of phosphate fertilizer by-product has been investigated to comprehensive application of the silicon and fluorine source. Two-step ammoniation was applied to recover high-quality silica. The recovered silica can be used to hydrothermal synthesize ZSM-5 zeolite without impurity phase contamination, which was confirmed by XRD, TG, SEM, BET and EDS characteristic techniques. It was found that with the increase of SiO 2 /Al 2 O 3 ratio and the extension of reaction time, the crystal type transform from the orthorhombic to the monoclinic phase. The impurity fluorine content of the recovered SiO 2 from H 2 SiF 6 has great influence on the hydrothermal process for ZSM-5 crystal structure formation. Moreover, the increase of fluorine ions content in the hydrothermal process can control the crystal morphology and size of synthesized ZSM-5. Catalytic properties of synthesized HZSM-5 with different SiO 2 /Al 2 O 3 ratio in transalkylation of toluene and 1,2,4-trimethylbenzene show good and stable catalytic performance. The ZSM-5 synthesized with recovered silica source exhibits similar catalyst life as the performance of small particle size HZSM-5, because the ZSM-5 synthesized with the silica source from industrial hexafluorosilicic acid prefers a thin disk crystal along the b axis direction, which shortens the diffusion distance of generated products.
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高影响因子
RSC Advances
·
2013
·Vol. 3
·期 20
·7360-7366
·
IF 2.562
Shimin Kang,Jun Ye,Yu Zhang,Jie Chang
Amorphous carbon-based sulfonated catalysts were generated from four kinds of biomass (lignin, cellulose, wood meal and D-xylose) by hydrothermal carbonization at various temperatures (225, 245 and 265 °C) followed by sulfonation, with a yield of 36–56%. All of these catalysts showed aromatic structure, hydroxyl and carboxyl groups, with a density of SO3H groups between 0.56 and 0.87 mmol g−1. 5-Hydroxymethylfurfural (HMF) was produced from inulin in ionic liquids (ILs) in one step with the addition of carbon-based sulfonated catalysts, with a factual yield of 47–65% at 100 °C, 60 min. Moderate extension of reaction time (from 30 to 90 min) and increase of temperature (from 80 to 120 °C) promoted HMF production. Ethyl acetate was used as extractant, and about 39–55% of HMF can be recovered from ILs. One problem with these carbon-based sulfonated catalysts was that they would be partly deactivated in ILs for separate reuse, however, they can be easily regenerated by dilute sulfuric acid treatment. The carbon-based sulfonated catalysts exhibited good catalytic activity compared with traditional solid acid catalysts, and the carbon-based sulfonated catalyst/ILs reaction system showed high reusability. In consideration of the renewable as well as the high catalytic activity abilities, these biomass derived carbon-based sulfonated catalysts would be promising for industrial application.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Hongli Wu,Binbin Wen,Hua Zhou,Jiadong Zhou,Zuolong Yu,Liyan Cui,Ting Huang,Fei Cao
Polyethylene 2, 5-furandicarboxylate-lactic acid copolyesters (PEFL) were synthesized from bis (hydroxyethyl)-2, 5-furandicarboxylate and oligomer of l -lactic acid, through two-stage condensation . The polyesters were characterized using FTIR, 1 H NMR, GPC , and WXRD. The weight-average molecular weight (M w ) of the polyesters ranged from 68240 to 130433. The glass transition temperature (T g ) of the copolyesters increased gradually with increasing content of 2, 5-furandicarboxylate. In phosphate buffer solution (PBS, pH = 7.4) and in soil, the degradability of the polyesters was evaluated for 55 d. More weight loss was obtained with a higher ratio of lactate polymers in soil than those with a lower ratio in PBS. After 55 d, the weight loss of PEFL20/80 reached 65% and 24% in soil and PBS, respectively. However, the mole fraction of lactyl and furanic units that was calculated by 1 H NMR data did not change. Comparing the scanning electron microscopy images, we found many micro-cracks on the copolyester surfaces. Meanwhile, M w and T g also decreased prominently during degradation.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2015
·
IF 3
Shuguo Wang,Bing Liu,Ziliang Yuan,Zehui Zhang
In this study, magnetic γ-Fe 2 O 3 @ HAP-Mo catalyst was successfully prepared and characterized. The activity of the as prepared γ-Fe 2 O 3 @ HAP-Mo catalyst was evaluated by the oxidation of 5-hydroxymethylfurfural (HMF) with molecular oxygen. Some important reaction parameters were investigated and it was found that both the solvent and the reaction temperature showed great effect on HMF conversion and products selectivity. The highest HMF conversion of 95.8% was obtained in 4-chlorotoluene at the reaction temperature of 120 °C for 12 h, and the corresponding 2,5-diformylfuran, 2,5-furandicarboxylic acid and 5-hydroxymethyl-2-furancarboxylic acid yields were 67.5, 19.6 and 8.7%, respectively. The γ-Fe 2 O 3 @ HAP-Mo catalyst could be easily separated from the reaction mixture and reused several times without the loss of its catalytic activity.
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高影响因子
危险品化学品经营许可证（带存储）