ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Shaohua Zheng,Ying Huang,Guonan Chen
In this paper, a sensitive graphite/poly(methyl methacrylate) (PMMA) composite electrode was firstly applied to the determination of o-sec -butylphenol ( os BP). This polymer carbon paste electrode (CPE) effectively improved the soft surface of traditional CPE, and enhanced the sensitivity and reproducibility. Factors influencing detection processes were optimized and kinetic parameters were calculated. Under the optimal conditions, the amperometric current density was linear with the concentration of os BP in the range from 2.50 × 10 −7 to 3.55 × 10 −5 mol L −1 and the detection limit was 3.48 × 10 −8 mol L −1 . The proposed method was successfully used to determine os BP in greengrocery samples and satisfactory results were obtained.
研究领域:
电化学
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分析化学
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环境监测
·
材料科学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2014
·
IF 0.872
Ting Qiu,Wenli Tang,Chenggang Li,Chengming Wu,Ling Li
The acid-functionalized ionic liquid ([HSO 3 Pmim]HSO 4 ) was synthesized by a two-step method. Nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR) show that the synthesis method is feasible and high purity of ionic liquid can be obtained. Using [HSO 3 Pmim]HSO 4 as the catalyst, we studied the reaction kinetics of synthesizing sec -butyl alcohol from sec -butyl acetate and methanol by transesterification in a high-pressure batch reactor. The effects of temperature, initial molar ratio of methanol to ester, and catalyst concentration on the conversion of sec -butyl acetate were studied. Based on its possible reaction mechanism, a homogeneous kinetic model was established. The results show that the reaction heat Δ H is 10.94 × 10 3 J·mol − 1 , so the reaction is an endothermic reaction. The activation energies E a + and E a − are 60.38 × 10 3 and 49.44 × 10 3 J·mol − 1 , respectively.
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高影响因子
Environmental Science-Nano
·
2025
·
IF 5.1
Zhehan Yang,Yijie Huang,Mingfang Yang,Ruiqi Wang,Xiaoyan Wu
Poor conductivity and insufficient structural stability of metal–organic frameworks (MOFs) restrict their use in detecting water pollutants. In this work, a PtCu hydrogel was synthesized to support the Cu-BTC MOF (PtCu@Cu-BTC) by coordinating 1,3,5-benzenetricarboxylic acid (BTC) directly on the surface of the PtCu hydrogel for the sensitive detection of o-sec-butylphenol (osBP). Importantly, the three-dimensional network structure of the PtCu hydrogel serves as a stable scaffold, providing a matrix to load metal ions that chelate with BTC. This approach not only enhances the structural stability of the MOFs but also greatly improves their electrical conductivity, allowing the catalyst to maintain consistent catalytic activity and stability during water pollutant detection. Additionally, the in situ formed Cu-BTC coordination layer increases the specific surface area, creating numerous active sites, and offers functional groups that promote pollutant adsorption, thereby significantly boosting sensor performance. The findings show that the developed biosensor has a strong linear response to osBP concentrations ranging from 3 to 100 μM, with a low detection limit of 0.68 μM. This work offers new insights for designing MOF-based functional materials that combine excellent conductivity with robust structural stability.
研究领域:
材料科学
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电化学
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环境监测
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传感器与生物传感器
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纳米材料
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 44
·27207-27214
·
IF 3.361
Hongmei Zhang,Yuxiang Chen,Shichao Xu,Jing Wang,Huanhuan Dong,Zhendong Zhao,Jianxin Jiang
In this study, a series of novel p-menthane type secondary amines (sec-p-menthane-7-amine derivatives 3a–3y) were synthesized and then characterized by FTIR, 1H NMR, 13C NMR, and HRMS. The post-emergence herbicidal activities of these amines against barnyard grass and rape were evaluated by the culture dish method. Most of the sec-p-menthane-7-amine derivatives showed excellent herbicidal activities equivalent to or even higher than either diuron or glyphosate. The alkyl-substituted derivatives were more active than the phenyl-substituted derivatives. The herbicidal activities of compounds 3p, 3r, 3u, and 3w against the root growth of barnyard grass were 404% higher, respectively, than those of glyphosate. The herbicidal activities of compounds 3q, 3v, 3w, and 3x against the root growth of rape were 561%, 494%, 491%, and 544% higher, respectively, than those of diuron, and 484%, 760%, 423%, and 665% higher respectively, than those of diuron against shoot growth of rape. In addition, compounds 3p, 3u, and 3v are almost harmless to rice, wheat, sorghum, maize, and peanuts at a concentration of 100 mg L−1. Most of the compounds are nontoxic to HUVEC-C and BALB/c 3T3 cells. It is indicated that the title compounds could be utilized as botanical herbicides for future weed control.
研究领域:
植物学
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药理学
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农业化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Miaomiao Cui,Peixin Hong,Yaxin Cai,Yongsheng Lin,Xiaoyan Chen,Ting Qiu,Jie Chen
Sec-butanol (SBA) is an important industrial medium-polar solvent, mainly used as methyl ethyl ketone precursor and in coatings, fuels, fine chemicals. Transesterification is its dominant synthesis route for economical feedstocks and easy downstream separation. However, industrial homogeneous catalysts suffer from separation difficulties, equipment corrosion, and poor continuous operability, and heterogeneous catalysts often exhibit relatively low catalytic activity. To balance catalytic activity and industrial application, a heterogeneous catalyst was firstly prepared by anchoring choline-based ionic liquids on swellable Ps-Cl (optimized swelling enhanced active site accessibility). Then, choline-functionalized supported shaped catalyst (Ps-Ch[IM]) was obtained via quaternization of macroporous styrene-based polymers with N,N’ -dimethylethanolamine (DMEA) and ion exchange. Under reaction temperature of 60 o C, alcohol-to-ester molar ratio 5:1, catalyst dosage 5 % (mass) and reaction time 240 min, Ps-Ch[IM] achieved 26.60% sec-butyl acetate (SBAC) conversion, surpassing reported literature results. DFT calculation and in situ DRIFTS confirmed that Ps-Ch[IM] activates methanol (MeOH) via [IM] - and SBAC via the OH group in DMEA; subsequently, CH 3 O* attacks the C=O bond in SBAC and combines with CH 3 CO* to form MA, while the proton combines with *OCH(CH 3 )CH 2 CH 3 to yield the target product SBA. Moreover, Ps-Ch[IM] shown stable performance in continuous fixed-bed reaction with the yield of 20.86% after 1800 min, indicates industrial application potential.
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CHIRALITY
·
2018
·Vol. 30
·期 8
·1027-1035
·
IF 1.833
Yilong Wang,Yongkai Xu,Yun Zhang,Aijun Sun,Yunfeng Hu
We previously identified and characterized 1 novel deep-sea microbial esterase PHE21 and used PHE21 as a green biocatalyst to generate chiral ethyl (S)-3-hydroxybutyrate, 1 key chiral chemical, with high enantiomeric excess and yield through kinetic resolution. Herein, we further explored the potential of esterase PHE21 in the enantioselective preparation of secondary butanol, which was hard to be resolved by lipases/esterases. Despite the fact that chiral secondary butanols and their ester derivatives were hard to prepare, esterase PHE21 was used as a green biocatalyst in the generation of (S)-sec-butyl acetate through hydrolytic reactions and the enantiomeric excess, and the conversion of (S)-sec-butyl acetate reached 98% and 52%, respectively, after process optimization. Esterase PHE21 was also used to generate (R)-sec-butyl acetate through asymmetric transesterification reactions, and the enantiomeric excess and conversion of (R)-sec-butyl acetate reached 64% and 43%, respectively, after process optimization. Deep-sea microbial esterase PHE21 was characterized to be a useful biocatalyst in the kinetic resolution of secondary butanol and other valuable chiral secondary alcohols.
研究领域:
生物化学
·
有机化学
·
酶工程
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Xin Li,Haixing Wang,Peiyong Sun,Shenghong Zhang,Zhilong Yao
Cu/ZrO 2 catalysts with or without boron modification were prepared, characterized, and evaluated in the hydrogenation of sec -butyl acetate (SBA) to 2-butanol. Cu/ZrO 2 catalysts were active for the hydrogenation of SBA but suffered serious deactivation due to the leaching of Cu. Introduction of boron onto Cu/ZrO 2 catalysts improved the dispersion of Cu species, the surface Cu + /Cu 0 ratios, and the catalyst stability owing to the enhanced interaction between Cu species and support. However, it decreased the intrinsic activity of Cu towards the hydrogenation of SBA and complicated the reaction network by accelerating acid-catalyzed isomerization and transesterification processes as a result of the strengthened acidity by boron. A further kinetic analysis unravelled that the reaction orders for SBA and H 2 are 0.58 and 0.83, respectively, and the apparent activation energy is 47 kJ/mol. Such understanding of the structural evolution of CuB/ZrO 2 catalysts and the consequent catalytic performances with the B contents may provide insights useful for the design of Cu catalysts with desirable stability for hydrogenation of SBA and other esters.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2025
·Vol. 36
·期 8
·085104
·
IF 3.4
Chengcheng Wan,Zhaoru Ban,Dan Zhang,Jiumei He,Yanju Chen,Shan Tang,Qianchun Zhang
Methyl sec-butyl ether (MSBE), a volatile organic compound, poses significant risks to both environmental safety and human health. Consequently, developing efficient sensors for the rapid and accurate detection of trace levels of MSBE is essential. In this study, we synthesized mesoporous CeO2 nanoparticles using carbon quantum dots as templates, resulting in the development of a highly sensitive cataluminescence sensor system. This sensor demonstrated an impressive linear detection range of 0.50–20 mg l−1 (R2 = 0.998) and a low detection limit of 0.08 mg l−1, coupled with a signal-to-noise ratio (S/N) of 3. We applied the mesoporous CeO2 nanoparticle sensor to measure MSBE levels in various environments, including a volatile medicine reagent freezer, laboratory gas, and a storage cabinet, which yielded concentrations of 2.07, 1.38, and 3.96 mg l−1, respectively. The sensor also exhibited excellent recovery rates, ranging from 91.1% to 110%, with relative standard deviations (RSD, n = 5) from 3.4% to 8.7%, indicating reliable performance. Additionally, gas chromatography-mass spectrometry was employed to elucidate the mechanism underlying the developed cataluminescence sensor. This study introduces a versatile approach for designing gas sensors for MSBE that not only exhibits high sensitivity and selectivity but also significantly enhances their potential applications in both industrial and environmental monitoring.
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高影响因子
PLANT CELL REPORTS
·
2025
·Vol. 44
·期 2
·1-15
·
IF 4.5
Li Xue,Zhou Yue,Chen Hang,Guo Zetian,Zhang Jinlian,Chen Wenli
Key message The three SDEs of C Las were expressed in citrus leaves by AuNPs-PEI mediated transient expression system, and promoted the proliferation of C Las and inhibited citrus immunity. Huanglongbing (HLB) is the most severe bacterial disease of citrus caused by Candidatus Liberibacter asiaticus ( C Las). C Las suppress host immune responses and promote infection by sec-dependent effectors (SDEs), thus insight into HLB pathogenesis is urgently needed to develop effective management strategies. In this study, we focused on the roles of SDE4310 , SDE4435 and SDE4955 in citrus. We found that the expression of SDE4310 , SDE4435 and SDE4955 to increase with increasing citrus immune genes CsPR1 , CsPR2 , CsPR5 , CsNPR1 , CsRBOHD , CsMAP3K and CsBIK1 , suggesting that the level of citrus immunity could be judged by the expression of SDE. To further explore the relationship between these three SDEs and citrus immunity, we established a transient expression system in citrus leaves, using gold nanoparticle-polyethyleneimine (AuNPs-PEI) to deliver recombinant plasmid containing SDE4310 , SDE4435 or SDE4955 respectively into citrus leaves. Results showed that SDE4310 , SDE4435 and SDE4955 were successfully expressed in citrus leaves using this transient expression system, and found that SDE4310 , SDE4435 and SDE4955 could promote the C Las proliferation by decreasing the immune gene expression of the citrus. Additionally, we used AuNPs-PEI to deliver siRNA 4310 to citrus cells, significantly reducing the expression of SDE4310 within 3 days. Although the suppression of SDE4310 expression did not inhibit the C Las proliferation, it increased the expression level of CsPR1 , CsNPR1 and CsBIK1 . This is also the first time that AuNPs-PEI has been found to be able to deliver exogenous plasmids into citrus cells and express the target protein, providing a new method for future studies on citrus HLB.
研究领域:
植物病理学
·
分子生物学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Gang Wang,Zengxi Li,Liu Fan,Chunshan Li,Suojiang Zhang
S ec -amines catalyzed two-step Mannich reaction for preparation of methacrolein from propionaldehyde and formaldehyde was more attractive than the C 4 selective oxidation route. Herein, a novel continuous fixed-bed process was developed for direct preparation of methacrolein from above stocks with catalysis of sec -amine grafted D301 resin. The effect of resin, sec -amine structure and grafting percentage on catalytic performance of the modified resin were detailed investigated and demonstrated by using FT-IR, TG-DTA, titration and solid-state NMR characterization methods before the optimal conditions were obtained. The grafting percentage of amine with abundant sec -amino groups onto D301 resin could reach 93.7% at optimal condition. With this new strategy, the yield and selectivity of methacrolein could attain 40.2% and 99.3%. In addition, the Mannich reaction step with activation energy of 66.3 kJ/mol was determined as the rate-controlling step through mechanism-based kinetic calculation.
研究领域:
有机化学
·
催化化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2012
·
IF 6.002
Xiang Li,Yi Shi,Zhoujun Wang,Yahong Zhang,Yi Tang
In this paper, uniform H-β nanozeolite microsphere (β-ZMS) prepared by polymerization-induced colloid aggregation, combined with an immobilized lipase B from Candida antarctica (commercially available Novozym® 435), is applied as a racemization catalyst to the one-pot dynamic kinetic resolution (DKR) of aromatic sec -alcohols. The DKRs of various aromatic sec- alcohols can be carried out with high selectivity and conversion under optimum conditions. Importantly, it is found that, compared to commercial zeolites β (C-β), β-ZMSs display high selectivity for small sec- alcohol molecules because their shorter microporous channels reduce the diffusion time of substrate/product in the three-dimensional framework, and thereby decrease the possibility of secondary reactions. However, the β-ZMSs show a high racemization rate in the DKR of large sec- alcohol molecules, such as racemic 1-(1-naphthyl)-ethanol, thanks to their abundant accessible active sites. This observation will not only benefit the performance of acidic zeolite catalysts in one-pot DKR systems but also provide a new perspective on the application of nanozeolites in catalysis.
研究领域:
催化化学
·
生物化学
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产品关联
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2017
·
IF 2.502
Kun Zhang,Zhiyou Pan,Zhoujian Diao,Shuli Liang,Shuangyan Han,Suiping Zheng,Ying Lin
Kinetic resolution of sec -alcohols is a green process with biocatalyst. Candida antarctica lipase B (CALB) displayed on Pichia pastoris cell-surface (Pp-CALB) was characterized in kinetic resolution of sec -alcohols with different structures. The reaction parameters including acyl donors, molar ratio of substrates, solvents and temperatures were examined with 2-octanol as model substrate. 47.4% molar conversion of 2-octanol and 99.7% ee p were obtained after a 5 h reaction with Pp-CALB, and 90% of its original activity still remained after being reused for 10 cycles. Pp-CALB was then used to several sec -alcohols and it showed great enzymatic activity and enantioselectivity to all tested sec -alcohols, more than 93.1% of ee p . The enantioselective characteristics of Pp-CALB catalysed sec -alcohols with different structures were compared with Novozyme 435 which was almost the same. Solvent free system as one way of green chemistry was applied to Pp-CALB and Pp-CALB showed great catalytic activity and enantioselectivity. Pp-CALB was potential biocatalyst of high enzymatic activity and enantioselectivity using in resolution of sec -alcohols.
研究领域:
生物化学
·
酶工程
·
绿色化学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）