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Food Quality and Safety 2023年第1期7卷 138-144页

作者：康宇婷李城华李慧茹栗婧蒋可志 college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhouChina

Polycarboxylic acids(PACs)are important metabolic products in almost all living bodies,yet current analytical methods for detection of PACs in tea beverages are still unsatisfactory due to the complex matrix and physicochemical properties of PACs.In this work,a rapid method was developed for the simultaneous determination of 7 PACs,including tartaric acid,α-ketoglutaric acid,malic acid,malonic acid,cis-aconitic acid,succinic acid,and fumaric acid,in beverages,based on selective removal of the matrix in combination with liquid chromatography–mass spectrometry(LC-MS)analysis.By stirring with activated carbon and the Na2CO3 solution,the matrix in beverages was selectively removed,and PACs were almost retained in the supernatant of diluted Na2CO3 solution.Under optimized parameters,the limit of quantitation for the PACs was in the range of 1–50 ng/mL,and the content of the PACs in 8 beverages was determined with the recovery range of 72.2%–122.5%.The contents of malic acid,malonic acid,and succinic acid in tea beverages were found to be greater than those in non-tea beverages.Moreover,the concentration of these PACs in beverages was found to be multiplied many times in their deterioration period,especially for fumaric acid andα-ketoglutaric acid.These results indicated that PACs can be selected as a criterion to differentiate qualified tea beverages from spoiled beverages.

关键词： Tea beverage deterioration polycarboxylic acid simultaneous determination liquid chromatography-mass spectrometry

A sensitive acetaminophen sensor based on Co metal–organic framework(ZIF-67)and macroporous carbon composite

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Rare Metals 2022年第1期41卷 189-198页

作者： Jing Tang Zhen-Zhen Hui Tao Hu Xin Cheng Jia-Hao Guo Zi-Rong Li Hao Yu College of Chemistry and Material Engineering Anhui Science and Technology UniversityBengbu 233030China

The composite of zeolitic imidazolate frameworks(ZIF-67)and ordered macroporous carbon(OMC)was successfully synthesized via in situ growth from the OMC matrix.The ZIF67–OMC composite was verified by scanning electron microscopy(SEM)and transmission electron microscopy(TEM),powder X-ray diffraction(XRD)and electrochemical impedance spectroscopy(EIS)and then evaluated as a modified material for electrochemical sensor.Benefitting from the large surface area and enhanced conductivity of the ZIF67–OMC composite,ZIF67–OMC nanocomposite showed superior electrocatalytic performance toward acetaminophen(AP)oxidation.The redox reaction of AP underwent a quasi-reversible redox reaction with higher anodic current at ZIF67–OMC modified electrode compared with the bare glassy carbon electrode(GCE).In optimal condition,the ZIF67–OMC/GCE was stable,reproducible and had a linear range of 0.05–100 μmol·L^(-1) AP concentration,with the detection limit of 20 nmol·L^(-1)(signal-to-noise of S/N=3).In addition,the prepared sensing platform for the detection of AP was evaluated for the compound paracetamol tablets and urine samples.

关键词： Macroporous carbon ZIF-67 Acetaminophen Modified electrode

Molecular oxygen-mediated selective hydroxyalkylation and alkylation of quinoxalin-2(1H)-ones with alkylboronic acids

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Chinese Chemical Letters 2022年第4期33卷 2036-2040页

作者： Hongdou Zhang Jun Xu Yani Ouyang Xiaoguang Yue Chenxin Zhou Zhigang Ni Wanmei Li college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121China

Herein, an efficient molecular oxygen-mediated method for the selective hydroxyalkylation and alkylation of quinoxalin-2(1 H)-ones with alkylboronic acids under transition-metal free conditions has been developed. This strategy demonstrates a broad scope of quinoxalin-2(1 H)-ones and alkylboronic acids, giving3-hydroxyalkylquinoxalin-2(1 H)-ones and 3-alkylquinoxalin-2(1 H)-ones in moderate-to-good yield. Control experiments reveal that a radical pathway is involved.

关键词： Quinoxalin-2(1H)-ones Molecular oxygen Alkyl boric acid C-C,C-O bond formations

原位电化学钾离子插层促进层间限域的硝酸盐还原制氨反应

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Science China materials 2023年第4期66卷 1352-1361页

作者：徐梦秋章烨周海桥李笑宇周钰虎徐旭东贾淦祝根平毋芳芳高鹏叶伟 college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China college of materials Science and engineering Zhejiang University of TechnologyHangzhou 310014China

将硝酸根离子电化学转化回有价值的氨(NH_(3))是传统Haber Bosch工艺的一种可能的替代方案.然而,硝酸根电还原制氨目前仍然受制于从NO_(3)^(-)到NH_(3)的低催化活性和低法拉第效率(FE).本文中,我们报告了二维层状结构中的层间限域的硝... 详细信息

将硝酸根离子电化学转化回有价值的氨(NH_(3))是传统Haber Bosch工艺的一种可能的替代方案.然而,硝酸根电还原制氨目前仍然受制于从NO_(3)^(-)到NH_(3)的低催化活性和低法拉第效率(FE).本文中,我们报告了二维层状结构中的层间限域的硝酸盐还原制氨反应(NTRR).结果表明,原位电化学钾离子(K^(+))插层扩大了层间距,从而触发了层间限域的NTRR.所制备的α-Ni_(0.902)Cu_(0.098)(OH)_(2)超薄纳米片具有高的NTRR性能,在-0.6 V(相对于可逆氢电极)下的NH_(3)产率和FE分别达到了13.4 mol g_(cat).^(-1)h^(-1)和98.9%,远超过已报道的铜基电催化剂.此外,该催化剂还表现出良好的循环稳定性,连续循环20次后活性和FE没有明显的衰减.此外,我们利用原位电化学拉曼光谱结果揭示了从NO_(3)^(-)到NH_(3)的途径.

关键词：拉曼光谱电还原硝酸根电催化剂连续循环制氨氢电极替代方案

Application of Langlois' reagent(NaSO_(2)CF_(3)) in C–H functionalisation

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Chinese Chemical Letters 2022年第3期33卷 1227-1235页

作者： Jiabin Shen Jun Xu Lei He Chenfeng Liang Wanmei Li college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China

The process of selectively introducing a CF_(3) group into an organic molecule using inexpensive, stable, and solid sodium trifluoromethanesulfinate has rapidly advanced in recent years to become an eco-friendly method used by organic chemists to synthesize various natural and bioactive molecules. This review focuses on advances made within the last five years regarding C-H functionalisation, namely thermochemical C(sp^(2))-H (thio)trifluoromethylations, photochemical C(sp^(2))-H trifluoromethylations, and electrochemical C(sp^(2))-H trifluoromethylations, using Langlois’ reagent (NaSO_(2)CF_(3)).

关键词： Trifluoromethylation Langlois’reagent Reaction mechanism Synthetic method C–H activation

Construction of diverse C–S/C–Se bonds via nickel catalyzed reductive coupling employing thiosulfonates and a selenosulfonate under mild conditions

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Organic chemistry Frontiers 2022年第5期9卷 1375-1382页

作者： Yong Liu Shuya Xing Jing Zhang Wen Liu Yuenian Xu Yan Zhang Kefang Yang Lei Yang Kezhi Jiang Xinxin Shao college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121ZhejiangPeople’s Republic of China

A nickel-catalyzed reductive cross coupling between organic iodides and thiosulfonates and a selenosulfo-nate under mild conditions is disclosed.This practical method provides a facile access to a series of unsym-metr... 详细信息

关键词： nickel catalyzed coupling

Heterogeneous uptake of NO_(2) by sodium acetate droplets and secondary nitrite aerosol formation

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Journal of Environmental Sciences 2023年第5期127卷 320-327页

作者： Wen-Xiu Pei Shuai-Shuai Ma Zhe Chen Yue Zhu Shu-Feng Pang Yun-Hong Zhang School of chemistry and Chemical engineering Beijing Institute of TechnologyBeijing 100081China College of Chemistry and Material Engineering Quzhou UniversityQuzhou 324000China

The high NO_(3)^(−)concentration in fine particulate matters(PM_(2.5))during heavy haze events has attracted much attention,but the formation mechanism of nitrates remains largely uncertain,especially concerning heterogeneous uptake of NOX by aqueous phase.In this work,the heterogeneous uptake of NO_(2) by sodium acetate(NaAc)droplets with different NO_(2) concentrations and relative humidity(RH)conditions is investigated by microscopic Fourier transform infrared spectrometer(micro-FTIR).The IR feature changes of aqueous droplets indicate the acetate depletion and nitrite formation in humid environment.This implies that acetate droplets can provide the alkaline aqueous circumstances caused by acetate hydrolysis and acetic acid(HAc)volatilization for nitrite formation during the NO_(2) heterogeneous uptake.Meanwhile,the nitrite formation will exhibit a pH neutralizing effect on acetate hydrolysis,further facilitating HAc volatilization and acetate depletion.The heterogeneous uptake coefficient increases from 5.2×10^(−6) to 1.27×10^(−5) as RH decreases from 90%to 60%due to the enhanced HAc volatilization.Furthermore,no obvious change in uptake coefficient with different NO_(2) concentrations is observed.This work may provide a new pathway for atmospheric nitrogen cycling and secondary nitrite aerosol formation.

关键词： Heterogeneous uptake NaAc droplets Nitrite Uptake coefficient

Protein assembly:Controllable design strategies and applications in biology

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聚集体(英文)

聚集体(英文) 2023年第3期4卷 19-35页

作者： Yijia Li Ruizhen Tian Haolu Shi Jiayun Xu Tingting Wang Junqiu Liu college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationKey Laboratory of Organosilicon Material TechnologyZhejiang ProvinceHangzhou Normal UniversityHangzhouChina

Protein assembly is the structural basis for the collaboration between proteins to accomplish life activities due to its realization of the domain-limited and precise spatial arrangement of proteins.Therefore,artificial manipulation of protein selfassembly has profound implications in areas such as exploring the mysteries of life and developing biomaterials.In this review,we not only summarize the classical assembly strategies and the structures of exquisite protein assemblies,but also aim to generalize the flexible and controllable assembly tools and the“interaction”between the assembled protein-based materials and the external environment.On the basis of this,the application,challenges and further development of protein assembly in biology are reviewed.

关键词： biomaterials controllable construction strategies protein nanostructures protein self-assembly

A New Vanadium Phosphate Incorporating Copper-organonitrogen Ligand： Synthesis,Crystal Structure and Electrochemical Property

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Chinese Journal of Structural chemistry 2016年第7期35卷 1115-1121页

作者：郑新芳韩占刚 college of chemistry and Chemical engineering and material Science Handan College college of chemistry & material Science Hebei Normal University

A new phosphovanadate metal-organic complex Cu（mbpy）（VO2）（PO4）（1, mbpy = 5,5＇-dimethyl-2,2＇-dipyridyl） has been hydrothermally synthesized and structurally characterized. Single-crystal structure analysis reveals that compound 1 crystallizes in the monoclinic space group P21/c with a = 7.6640（4）, b = 18.8832（10）, c = 10.1893（5） A, β = 94.782（1）°, V = 1469.47（13）A^3, Z = 4, Mr = 425.69, Dc = 1.924 g/cm^3, F（000） = 852, μ（Mo Kα） = 2.224 mm-1, R = 0.0291 and w R = 0.0980. The crystal structure of 1 features a one-dimensional framework constructed by inorganic {Cu（VO2）（PO4）}∞ neutral chain and organic mbpy ligands. The electrochemical property of compound 1 modified carbon paste electrode has also been investigated.

关键词： phosphovanadate copper polymer electrochemistry

Ion transporters: emerging agents for anticancer therapy

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Science China chemistry 2022年第7期65卷 1265-1278页

作者： Tengfei Yan Xin Zheng Shengda Liu Yingping Zou Junqiu Liu State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China college of material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationKey Laboratory of Organosilicon Material Technology of Zhejiang ProvinceHangzhou Normal UniversityHangzhou 311121China

Natural ion channels are pore-forming proteins that allow ions to pass through biomembranes, playing pivotal roles in almost all facets of cellular physiological functions. Biomimetic ion transporters were initially investigated for the purpose of treating lifethreatening channelopathies. Recent studies have indicated that membrane-active synthetic ionophores possess desirable anticancer bioactivity against diverse cancer cell lines by disturbing intracellular ion homeostasis, triggering oxidative stress, and inducing apoptosis in tumors. Recent progress on ionophore-related antitumor therapeutics is comprehensively summarized in this review, including the molecular design principles, functional mechanisms, and characterization methods. Finally, we conclude this review by discussing the future opportunities and challenges in this field. It is anticipated that this review will provide an existing panoramic sketch and future directions toward the construction of novel ion transporters with simplified preparation procedures, enhanced biocompatibility, and desirable anti-proliferative activities, which may further accelerate their therapeutic applications in clinical treatments.

关键词： ion transporter ion homeostasis apoptosis anticancer treatment