BIOTECHNOLOGY LETTERS
·
2017
·Vol. 39
·期 8
·1175-1181
·
IF 1.73
Zhou Youzhi,Liu Ke,Zhang Jinsong,Chu Jianlin,He Bingfang
Objective To improve the stability of β-galactosidase from Bacillus megaterium YZ08 (BMG) in aqueous hydrophilic solvents and promote its application in the galactosylation of natural products. Results The addition of 5 mM Mg 2+ significantly enhanced the stability of BMG in aqueous hydrophilic solvents, and the half-lives of BMG in these solutions reached 56 min to 208 h, while they were only 7 min to 5.9 h without addition of Mg 2+ . Studies on the kinetic parameters in buffer solution and 30% dimethyl sulfoxide (DMSO) indicated that the affinity of BMG to 2-nitrophenyl-β- d -galactopyranoside and its catalytic efficiency ( κ
cat / K
m ) increased with the addition of Mg 2+ . Furthermore, the addition of Mg 2+ facilitated galactosylation reactions in 30% DMSO and increased product conversions by 24–41% due to the reversal of the thermodynamic equilibrium of hydrolysis. Conclusion A convenient approach was established to improve the stability of BMG in aqueous hydrophilic solvents.
研究领域:
酶学
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生物催化
·
生物化学
·
有机化学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2014
·
IF 3.309
Songyan Jia,Kairui Liu,Zhanwei Xu,Peifang Yan,Wenjuan Xu,Xiumei Liu,Z. Conrad Zhang
While chromium trichloride hydrate (CrCl 3 ·6H 2 O) effectively catalyzed the isomerization of glucose into fructose in aqueous solution, a general product selectivity behavior was observed independent of reaction variables such as reaction time, temperature, catalyst loading, halide ion, and initial glucose concentration. By studying the mixed solution of dimethylsulfoxide (DMSO) and water at varied DMSO/H 2 O ratios, it was found that deviation from the general water-phase fructose yield curve, with concomitant 5-hydroxymethylfurfral (HMF) formation, occurred when the fructose concentration in available water became sufficiently high in DMSO rich solvent mix. Therefore, tuning the solvent system was the most effective approach to change the product distribution from CrCl 3 ·6H 2 O catalyzed glucose conversion. The apparent activation energy of glucose conversion in the studied system was estimated to be 58.6 kJ mol −1 . Special attention was also given to gain some mechanistic insights by control experiments with simple model compounds and additives, 13 C NMR and UV–vis spectroscopic analyses.
研究领域:
化学工程
·
催化
·
有机化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 14
·6756-6764
·
IF 3.925
Boyong Ye,Wenyang Zhang,Ruru Zhou,Yuanyuan Jiang,Zixin Zhong,Zhaoyin Hou
The dehydration of fructose to 5-hydroxymethylfurfural (5-HMF) is a crucial step in the biorefinery process, and finding a recyclable solid-acid catalyst and green solvent remains a challenge. In this work, a mesoporous sulfonated high-crosslinked polymer (abbreviated as SHCP) was synthesized following a facile route and used in the dehydration of fructose to 5-HMF in different solvents. The structure and properties of SHCP were characterized using N2 adsorption–desorption, XRD, Raman, SEM, TEM, FTIR, 13C CP/MAS NMR and XPS techniques. It was confirmed that SHCP possesses high surface area, uniform mesoporous and abundant sulphonic groups, and it can promote the dehydration of fructose to 5-HMF under mild reaction conditions. At the same time, the performance of SHCP in different solvents was tested in detail, it was found that SHCP exhibited similar initial activity in 1,4-dioxane/H2O mixture as that in dimethyl sulfoxide (DMSO), while the stability of SHCP in 1,4-dioxane/H2O mixture was enhanced obviously compared with that in DMSO. The reason for the deactivation of SHCP in different solvents was discussed, and it was disclosed that a small amount of water in DIO could depress the oligomerization of 5-HMF and enhance the stability of SHCP.
研究领域:
化学工程
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催化
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绿色化学
·
生物精炼
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 11
·6182-6195
·
IF 4.682
Wang Dan,Qu Yun,Wang Fenying,Li Qianjin,Cao Qianyong
Abstract Boronate affinity materials (BAMs) are gaining increasing attentions in the fields of separation, sensing, imaging, diagnostic, and drug delivery. However, poor selectivity caused by non-specific adsorption is still a shortcoming of the present BAMs, particularly organic BAMs. In this work, by investigating the effects of polymerization solvents and crosslinker types on binding selectivity of the PBA-functionalized polymers, we found that the phenylboronic acid (PBA)-functionalized polymers using N,N’ -methylbisacrylamide (MBAA) as the crosslinker synthesized in DMSO by one-pot polymerization approach displayed ultrahigh selectivity to the cis -diol containing molecules. The physical features of all the polymers were characterized in detail. The PBA-MBAA particles synthesized in DMSO showed a high binding affinity with dissociation constants of 2.0 × 10 –4 M and 9.8 × 10 –5 M to adenosine and catechol, respectively, and a relatively high binding capacity (46 ± 1 μmol/g for adenosine and 166 ± 12 μmol/g for catechol). Binding kinetics measurement demonstrated that such PBA-MBAA particles required a long time (30 min) to reach the adsorption equilibrium due to their microporous structure. The recovery rates for the extraction of nucleosides by this polymer were high (63 ~ 88%, n = 3). In general, selection of MBAA as the crosslinker and DMSO as the polymerization solvent is opt to obtain highly selective BAMs, such protocol can be employed not only for producing BAMs for separation, but also making fluorescent BAM nanoparticles for sensing and imaging. Graphical abstract
研究领域:
化学
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材料科学
·
分析化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fei Yan,Xiaohan Guo,Qingying Ye,Ping Li,Juanjuan Qi,Lidong Wang
Due to its excellent solubility for many chemicals, DMSO is widely used as solvents in industries. The biodegradation of DMSO is pretty slow and gives out noxious and volatile compounds like dimethylsulfide, methyl mercaptan, and hydrogen sulfide. Therefore, a green and efficient DMSO removal process is needed. In this work, supported molybdenum oxide catalysts were prepared and were characterized with powder XRD, SEM, TEM, Raman, DR-UV–vis spectroscopy and XPS. These catalysts are efficiently active for the catalytic oxidation of DMSO in wastewater using green oxidant, H 2 O 2 . The degradation product of DMSO is DMSO 2 which is an environmentally friendly and biodegradable compound and can be further removed by biological processes without forming hazardous sulfides. Fumed SiO 2 is the best support for MoO 3 and the catalytic activity increases with the increase of the MoO 3 loading. DMSO (179 mmol/L) is completely removed after a 2-hour reaction at 50 °C. EPR analyses and control experiments with radical scavengers confirm that the oxidative degradation of DMSO is not a radical reaction. Thus, a non-radical oxidation mechanism is proposed for the degradation of DMSO. The kinetic study on the 30 wt% MoO 3 /SiO 2 catalyst confirms that the catalytic oxidation reaction of DMSO is a pseudo-first-order reaction with an apparent activation energy of 68.5 kJ/mol. When the initial concentration of DMSO is further increased to 264 or 344 mmol/L, the MoO 3 /SiO 2 catalyst can still remove it within 2 h. In conclusion, this catalyst is a promising candidate for treating industrial wastewater containing DMSO.
研究领域:
环境科学
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催化
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化学工程
·
废物管理
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Zhen Ming Dong,Hong Ren,Jia Na Wang,Jian Bin Chao,Yu Wang
A simple naphthopyran derivative (L) has been synthesized as a colorimetric and ratiometric fluorescent probe for cyanide sensing in the aqueous DMSO medium and paper strips. The nucleophilic addition of CN − to this probe blocks the π-conjugation and the intramolecular charge transfer (ICT) transition between naphthopyran and benzoindolium moieties and consequently results in remarkable color and spectral changes. Upon addition of cyanide, L displayed a ratiometric fluorescence response with a blue shift of the peak position and a noticeable color change from fuchsia to colorless within 90 s. The probe exhibits high selectivity and sensitivity toward CN − over other anions and the detection limit was calculated to be 7.56 × 10 −7 M, which is well below the WHO cyanide standard in drinking water (1.9 μM). In addition, the excitation and emission of the probe were within the visible wavelength range, which could benefit an application of the probe in an inexpensive portable cyanide sensor. The sensing ability of L has been successfully applied in real water samples. Furthermore, test strips based on L were fabricated, which can act as convenient and efficient test kits for detecting CN − .
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 22
·期 2
·532-539
·
IF 9.405
Qixuan Lin,Shouwei Liao,Libo Li,Weiying Li,Fengxia Yue,Feng Peng,Junli Ren
In this study, experiments and molecular dynamics simulations were combined to get insights into the role of solvent during the process of xylose conversion under catalyst-free conditions. Solvents used for furfural production were comparatively discussed, including traditional and emerging biomass-derived solvents – water, dimethyl sulfoxide (DMSO), dimethyl formamide (DMF), isopropanol (ISO), γ-butyrolactone (GBL) and γ-valerolactone (GVL). The degradation behavior of solvents, the solubility and α/β ratio of xylose, the distribution of the solvent around xylose/furfural and the hydrogen bonding between them were also studied. The results showed that in pure solvents, the different hydrogen bonding between xylose and the solvent resulted in different products. Water was a favourable solvent for xylose to form furfural among these pure solvents because less formic acid was produced from xylose in water under catalyst-free conditions. Furfural could be produced in mixed solvents if there was more water around xylose, which was similar to the case in pure water. Otherwise, the situation in mixed solvents was similar to that in the corresponding pure organic solvents. GBL and GVL, as green solvents, had weaker affinities with xylose than DMSO, DMF and ISO, but were intensively attracted by furfural, thus they could provide protective shells for furfural, which played a positive role during the production of furfural. The highest furfural yield of 46.4% was achieved in GBL–H2O at 180 °C – 150 min in the absence of catalysts.
研究领域:
化学工程
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生物质转化
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分子动力学模拟
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绿色化学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2019
·Vol. 66
·期 1
·e16746
·
IF 3.463
Chao Bian,Yin-Ning Zhou,Zheng-Hong Luo
Controlled radical polymerization (CRP) under external field has been an attractive research area in these years. In this work, a new electron transfer mechanism, that is, sonochemically induced electron transfer (SET) was introduced to mediate polymerization for the first time. The activator Cu I X/L complex was (re)generated from Cu II X 2 /L in dimethylsulfoxide (DMSO) by the SET process in the presence of free ligand tris(2-dimethylaminoethyl)amine (Me 6 TREN). The investigation of polymerization including the mechanistic insights and effect of experimental conditions on the rate of reaction has been undertaken. Kinetics of Cu(II)-catalyzed CRPs via SET under different conditions (i.e., Me 6 TREN concentration, catalyst loading, targeted degree of polymerization, and sonication power) were conducted in an unprecedentedly controlled manner, yielding polymers with predetermined molar masses and low dispersities ( Đ < 1.12). Attractively, the polymerization can be performed without the piezoelectric nanoparticles and exogenous reducing agent. Contamination by nonliving chains formed from sonochemically generated radicals is avoided as well. All of these results supported that Cu(II)-based catalyst activation enabled by ultrasonication has a promising potential in scale-up of CRP.
研究领域:
高分子化学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chun Pei,Pi-yu Chen,Si-Cheng Kong,Junlin Wu,Ji-Hua Zhu,Feng Xing
Chemical swelling and electrochemical oxidation are combined to realize the separation and recovery of carbon fibers from carbon fiber-reinforced plastic (CFRP) in dimethyl sulfoxide (DMSO) at normal temperature and pressure. The results showed that the depolymerization rate of epoxy resin in CFRP increased with increasing ammonium acetate concentration and current density, and the influence of the current density was more significant than that of the concentration. Microscopic analysis showed that the recycled carbon fibers had few residual resin on their surfaces and mild electrochemical oxidation etching, and recycled carbon fiber monofilament achieved a tensile strength and an interfacial shear strength that were 93.55% and 118.76% those of the original fibers.
研究领域:
材料科学
·
复合材料
·
回收技术
·
环境工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Ze-Jun Wang,Qiao-Feng Zheng,Shu-Shen Liu,Peng Huang,Ting-Ting Ding,Ya-Qian Xu
At present, the toxicity prediction of mixtures mainly focuses on the concentration addition (CA) and independent action (IA) based on individual toxicants to predict the toxicity of multicomponent mixtures. This process of predicting the toxicity of multicomponent mixtures based on single substances or low component mixtures is called down-to-top method in this study. However, due to the particularity of some toxicants, we have to use the top-to-down idea to obtain or eliminate the toxicity of some components from mixtures. For example, the toxicity of toxicants is obtained from the toxicity of a mixture with, especially toxic, cosolvent added. In the study, two top-to-down methods, the inverse CA (ICA) and inverse IA (IIA) models, were proposed to eliminate the effects of a certain component from multicomponent mixtures. Furthermore, taking the eight binary mixtures consisting of different shapes of cosolvents (isopropyl alcohol (IPA) having hormesis and dimethyl sulfoxide (DMSO)) and toxicants (two ionic liquids and two pesticides) as an example, combined with the interaction evaluated by CA and IA model, the influence of different shapes of components on top-to-down toxicity prediction was explored. The results showed that cosolvent IPA having hormesis may cause unpredictable effects, even at low concentrations, and should be used with caution. For DMSO, most of the toxicant's toxicity obtained by ICA and IIA models were almost in accordance with those observed experimentally, which showed that ICA and IIA could effectively eliminate the effects of cosolvent, even if toxic cosolvent, from the mixture. Ultimately, a frame of cosolvent use and toxicity correction for the hydrophobic toxicant were suggested based on the top-to-down toxicity prediction method. The proposed methods improve the existing framework of mixture toxicity prediction and provide a new idea for mixture toxicity evaluation and risk assessment.
研究领域:
环境毒理学
·
风险评估
·
化学毒理学
·
药学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haiyan Wang,Zhuo Zhang,Ye Li,Feifei Zhang,Kuo Yang,Bing Xue
A clay-based quasi-solid-state electrolyte was prepared using dimethyl sulfoxide (DMSO) intercalated kaolinite as the raw material to suppress the adverse effects of free water molecules on aqueous zinc-ion batteries (AZIBs). Based on the inherent water absorption and retention properties of clay kaolinite, as well as the interlayer modification, this clay-based quasi-solid-state electrolyte not only achieved a low water content but also exhibited a strong water binding effect, which restricted the HER and side reactions involving water participation. Furthermore, the intercalation of DMSO increased the number of negative charges on the surface of kaolinite, resulting in the formation of a continuous spatial electrostatic field area around the kaolinite particles, which played a role in cation selectivity. The ionic transference number of the quasi-solid-state electrolyte reached 0.91. Additionally, the intercalation of DMSO broadened the interlayer ionic transport channels of kaolinite, further enhancing the transport efficiency of Zn 2+ in the quasi-solid-state electrolyte, achieving uniform deposition of Zn 2+ on the surface of the Zn anode, and suppressing dendrite growth to maintain a stable quasi-solid-state electrolyte/Zn anode interface. Zn||MnO 2 battery assembled with this electrolyte demonstrated a discharge specific capacity of 301 mAh/g at a current density of 60 mA g −1 . The Zn||MnO 2 battery could be stably cycled for 1000 cycles at a current density of 150 mA g −1 , and after 1000 cycles, the battery still maintained a discharge specific capacity of 248.2 mAh/g with a capacity retention rate of 84.8 %, showing excellent capacity performance and cycle stability. The Zn||MnO 2 pouch battery could still provide stable power under heavy pressure, bending, and continuous tapping and had the potential for use in flexible batteries.
研究领域:
材料科学
·
电化学
·
储能技术
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产品关联
DOI
高影响因子
Science of Advanced Materials
·
2022
·Vol. 14
·期 10
·1589-1598
·
IF 1.067
Jin Hong,Wu Yali,Li Yanzhong
Adsorption method has attracted extensive attention in heavy metal wastewater treatment due to its low cost, abundant sources, and simple operation. Kaolin is utilized as raw material, waterborne polyurethane is utilized as dispersion medium, and dimethyl sulfoxide (DMSO) is utilized
as intercalation agent, to prepare intercalation polymerization modified kaolin material (KBEP). It is then characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetry (TG), and other methods. The polymer is utilized
for static adsorption of Cu2+ and Pb2+, and the kinetic analysis of the adsorption process is carried out. The results show that the layer spacing of kaolin increases substantially (from 0.69 nm to 0.81 nm) after modification. When the content of kaolin is less than 1.7%,
kaolin exists in intercalation or stripping state in waterborne polyurethane matrix. When the content of kaolin is higher than 1.7%, kaolin can exist in the form of agglomeration with waterborne polyurethane matrix. Compared with pure polyurethane, the composite’s thermal stability is
improved, and the maximum thermal weight loss of the hard section is increased by 50 °C. When kaolin content is 2.5%, the temperature of the hardness and the fastest thermal decomposition rate of the soft section increases by 30 °C and 26 °C, respectively. The adsorption test reveals
that the Cu2+ elimination rate reaches 93.7% when the addition amount of the prepared material reaches 1.5 g/L. When the addition amount of the prepared material reaches 0.6 g/L, the Pb2+ elimination rate reaches 95.8%. With the increase of the dosage of kaolin composite,
the adsorbability of the polymer to the two metal ions decreases gradually. Kinetic experiments show that the adsorption of Cu2+ and Pb2+ is in line with the pseudo-second-order kinetic (PSOK) equation. The adsorbability of Cu2+ and Pb2+ is 75.3
mg/g and 268.6 mg/g, respectively. The adsorption way is mainly chemical adsorption.
研究领域:
环境科学
·
材料科学
·
化学工程
·
废水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）