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colorimetric detection of D-amino acids based on anti-aggregation of gold nanoparticles

Chinese Chemical Letters 2014年第7期25卷 995-1000页

作者： Long-Fei Yuan Yu-Jian He Hong Zhao Ying Zhou Pei Gu College of Chemistry and Chemical Engineering University of Chinese Academy of Sciences State Key Laboratory of Natural and Biomimetic Drugs Peking University

A new method has been proposed to realize the visual detection of D-amino acids （DAAs） via the antiaggregation of 4-mercaptobenzoic acid modified gold nanoparticles （AuNPs） in the presence of D-amino acid oxidase （DAAO）. The negatively charged AuNPs were prepared using sodium citrate as a reducer and stabilizer. The presence of 4-mercaptobenzoic acid （4-MBA） and Cu2＋ induces the aggregation of AuNPs, resulting in a color change from ruby red to royal purple. However, DAAO could oxidize DAAs to generate H2O2. In the presence of H2O2, the mercapto （-SH） group in 4-mercaptobenzoic acid can be oxidized to form a disulfide （-S-S-） bond. Based on these facts, the pre-incubation of DAAs and 4-mercaptobenzoic acid with DAAO would significantly reduce the concentration of free 4-mercaptobenzoic acid molecules, thus the aggregation of AuNPs was interrupted since due to the lack of inducer. As the concentration of DAAs increases, the color of the AuNPs solution would progress from royal purple to ruby red. Consequently, DAAs could be monitored by the colorimetric response of AuNPs using a UV-vis spectrophotometer or even naked eyes. This DAAO mediated visual detection method could determine D- alanine （D-Ala） as a representative DAA with concentrations ranging from 1.5 × 10^-7mol L 1 to 3.0 × 10^-5 mol L^-1, and the detection limit was as low as 7.5 × 10^-8 mol L^-1. The proposed method is convenient, low-cost and free of complex equipment, making it feasible to analyze the concentration of D-AIa in real samples of β-amyloid peptide （Aβ1-42）.

关键词： Gold nanoparticles D-Amino acids D-Amino acid oxidase Anti-aggreagtion colorimetric detection

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colorimetric detection of Glucose Using WO_(3) Nanosheets as Peroxidase-mimetic Enzyme

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Chemical Research in Chinese Universities 2022年第4期38卷 985-990页

作者： SHI Rui WEI Shuxian CHENG Shiqi ZENG Jinmin WANG Yilin SHU Xin School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004P.R.China

In the present work,WO_(3) nanosheets(WO_(3) NSs)were prepared by a facile method at room *** obtained WO_(3) NSs showed peroxidase-like activity,which could catalyze 3,3’,5,5’-tetramethylbenzidine(TMB)to form a blue oxidation product(ox TMB)in the presence of H_(2)O_(2).Based on this,convenient and sensitive colorimetric methods for the detection of H_(2)O_(2) and glucose were *** linear ranges for detecting H_(2)O_(2) and glucose were 1–200µmol/L and 1–100µmol/L,*** limits of the detection of H_(2)O_(2) and glucose were as low as 0.79 and 0.96µmol/L,*** method was also successfully applied to the detection of glucose in urine *** detection result was consistent with that of the value detected by the clinical method,indicating the potential in clinical diagnosis and biomedical detection.

关键词： WO3 nanosheet Peroxidase-like activity colorimetric detection H_(2)O_(2) Glucose

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Enhanced adsorption and colorimetric detection of tetracycline antibiotics by using functional phosphate/carbonate composite with nanoporous network coverage

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Journal of Environmental Sciences 2023年第4期126卷 365-377页

作者： Pratchayaporn Yukhajon Titikan Somboon Sira Sansuk Materials Chemistry Research Center Department of Chemistry and Center of Excellence for Innovation in ChemistryFaculty of ScienceKhon Kaen UniversityKhon Kaen 40002Thailand Department of Chemistry Faculty of EngineeringRajamangala University of Technology IsanKhon Kaen CampusKhon Kaen 40000Thailand

This work presents efficient tetracycline(TC) antibiotics adsorption using a functional porous phosphate/carbonate composite(PCC). The PCC was fabricated by anion-exchange of phosphate on the surface of vaterite-phase calcium carbonate particle scaffolds. The PCC,having dense nanoporous network coverage with large surface area and pore volume, exhibited excellent TC adsorption in solution. Its adsorption isotherm fitted well to the Freundlich model, with a maximum adsorption capacity of 118.72 mg/g. The adsorption process was spontaneous, endothermic, and followed pseudo-second-order kinetics. From the XPS analysis, the hydrogen bonding and surface complexation were the key interactions in the process. In addition, a colorimetric TC detection method was developed considering its complexation with phosphate ions, originating from PCC dissolution, during *** method was used to detect TC in mg/L concentrations in water samples. Thus, the multifunctional PCC exhibited potential for use in TC removal and environmental remediation.

关键词： Porous composite Calcium carbonate Tetracycline Adsorption colorimetric detection Surface complexation

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Biomineralization-inspired copper-cystine nanoleaves capable of laccase-like catalysis for the colorimetric detection of epinephrine

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 310-318页

作者： Miao Guan Mengfan Wang Wei Qi Rongxin Su Zhimin He School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300350China The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin Tianjin 300350China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin 300350China

Recently,many efforts have been dedicated to creating enzyme-mimicking catalysts to replace natural enzymes in practical *** by the pathological biomineralization behaviour of L-cystine,in this study,we constructed a laccase-like catalyst through the co-assembly of L-cystine with Cu *** analysis revealed that the formed catalytic Cu-cystine nanoleaves(Cu-Cys NLs)possess a Cu(I)-Cu(II)electron transfer system similar to that in natural *** kinetic studies demonstrated that the catalyst follows the typical Michaelis-Menten *** with natural laccase,the Cu-Cys NLs exhibit superior stability during long-term incubation under extreme pH,high-temperature or high-salt ***,the Cu-Cys NLs could be easily recovered and still maintained 76%of their activity after 8 ***,this laccase mimic was employed to develop a colorimetric method for epinephrine detection,which achieved a wider linear range(9–455μmol·L^(−1))and lower limit of detection(2.7μmol·L^(−1)).The Cu-Cys NLs also displayed excellent specificity and sensitivity towards epinephrine in a test based on urine samples.

关键词： biomineralization laccase L-cystine colorimetric detection enzyme mimic

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Copper-based nanomaterials as peroxidase candidates for intelligent colorimetric detection and antibacterial applications

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Particuology 2024年第1期84卷 126-135页

作者： Yanyan Huang Huimin Zhong Cong Jiang Jiahui Yang Jingwen Zhang Fei Zhao Chaoqun Liu College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing210037China College of Pharmacy Institutes of Environment and MedicineHenan UniversityKaifeng475004China

With natural polyphenol compound tannic acid(TA)as the ingredient,copper tannate(CuTA)nanolayer material was formed by self-assembly under the conditions of heating and copper *** ion and tannic acid could coordinate to form Cu-O-C structure which was similar to the Fe-N-C structure of natural heme *** addition,the obtained CuTA nanomaterial possessed excellent peroxidase-like catalytic activity and *** on this excellent enzymatic activity,CuTA nanomaterials could be used for colorimetric detection of hydrogen peroxide with a smartphone and decomposition of organic *** on the structural characteristics and catalytic activity,the copper tannate nanozymes could also serve as potential antibacterial reagents to effectively inhibit the growth of gram-negative and positive bacteria in a low hydrogen peroxide *** work may promote the exploration of novel peroxidase mimetics and broaden the applications of nanozymes.

关键词： Nanozyme colorimetric detection Smartphone Antibacteria

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Utilization of unmodified gold nanoparticles in colorimetric detection

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1757-1765页

作者： HE Sha LIU DingBin WANG Zhuo CAI KaiYong JIANG XingYu College of Bioengineering Chongqing University Chongqing 400044 China Chinese Academy of Sciences Key Laboratory for Biological Effects of Nanomaterials and Nanosafety National Center for NanoScience and Technology Beijing 100190 China

This review begins with an overview of the appealing properties and various applications of gold nanoparticles, and briefly summarizes recent advances in using unmodified gold nanoparticles to detect different kinds of targets including nucleic acids, proteins, metal ions and small organic molecules. The key point to the unmodified gold nanoparticle-based visual detection assay is to control dispersion and aggregation of colloidal nanoparticles by targets of interest, which usually relies on affinities between gold nanoparticles and targets. The degree of dispersion or aggregation can be visualized through the change of the solution color or the precipitation of nanoparticles from the solution. Thus, the existence of the target molecules can be trans-lated into optical signals and monitored by the naked eye conveniently. Finally, some future prospects of this research field are given.

关键词： gold nanoparticles colorimetric detection biosensor

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Bimetallic AuRu aerogel with enzyme-like activity for colorimetric detection of Fe^(2+) and glucose

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Chinese Chemical Letters 2022年第10期33卷 4683-4686页

作者： Rongxin Xu Ziyu Wang Siquan Liu He Li College of Optoelectronics Technology Chengdu University of Information TechnologyChengdu 610225China School of Chemistry and Chemical Engineering University of JinanJi'nan 250022China

Aerogels have become a hot topic of research due to their extremely low density and special interconnected structure as well as their enzyme-like *** development of new multifunctional nano-enzyme aerogels with high activity and good stability is still a considerable *** this paper,AuRu aerogels with peroxidase and oxidase activities were synthesized using a simple one-step method and successfully used to construct colorimetric sensors for the detection of Fe^(2+)and glucose based on their enzyme-like ***,we are fortunate to find that AuRu aerogels have good photothermal *** suggests that AuRu aerogels can be used not only for in vitro testing but also for promising applications such as disease treatment.

关键词： Au-Ru aerogels Multifunctional nanozyme Peroxidase-mimicking Oxidase-like activity colorimetric detection

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Selectively colorimetric detection of cysteine with triangular silver nanoprisms

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Chinese Chemical Letters 2009年第5期20卷 611-614页

作者： Tong Wu Yuan Fang Li Cheng Zhi Huang College of Pharmaceutical Sciences MOE Key Laboratory on Luminescence and Real-Time Analysis Southwest University Chongqing 400715 PR China College of Chemistry and Chemical Engineering MOE Key Laboratory on Luminescence and Real-Time Analysis Southwest University Chongqing 400715 PR China

Triangular silver nanoprisms were prepared and applied to make colorimetric detection of cysteine based on our findings that cysteine could lead to the blue shift of the dipole plasmon resonance absorption, but other 19 kinds of natural amino acids could not. Cysteine with a concentration 160 nmol/L can result in a color change that can be discerned with naked eyes.

关键词： Triangular silver nanoprisms Cysteine colorimetric detection

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Enhanced peroxidase-like activity of hierarchical MoS2-decorated N-doped carbon nanotubes with synergetic effect for colorimetric detection of H2O2 and ascorbic acid

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Chinese Chemical Letters 2020年第5期31卷 1109-1113页

作者： Jing Zheng Dandan Song Hong Chen Jingli Xu Njud SAlharbi Tasawar Hayat Min Zhang College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai 201620China Shanghai Key laboratory of Crime Scene Evidence Shanghai Research Institute of Criminal Science and TechnologyShanghai 200083China Biotechnology Research Group Department of Biological SciencesFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics Quaid-I-Azam UniversityIslamabad 44000Pakistan

The exploitation of multifunctional nanocomposites is highly desired in environmental monitoring,biosensors,and medical *** this paper,a simple approach has been proposed to fabricate MoS2 decorated N-doped carbon nanotubes(NCNTs@MoS2)hybrid composites as efficient peroxidase-like *** combination of the MoS2 and N-doped carbon nanotubes(NCNTs)brings about an enhanced synergistic effect,leading to remarkably decent intrinsic peroxidase-mimic activities than that of the single *** to the high catalytic efficiency of the resultant NCNTs@MoS2 hybrid nanotubes as peroxidase-like mimics,a co nvenient colorimetric approach for the sensitive determination of H2 O2 and ascorbic acid have been developed with a detection limit of about 0.14μmol/L and 0.12μmol/L,*** work offers a new strategy for the fabrication of peroxidase-like nanomaterials with excellent catalytic activity,which indicates great promising applications in sensitive detections in real samples.

关键词： MoS2 N-doped carbon nanotubes Peroxidase-1 ike colorimetric detection Ascorbic acid

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Bis-naphthalimide-based supramolecular self-assembly system for selective and colorimetric detection of oxalyl chloride and phosgene in solution and gas phase

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Chinese Chemical Letters 2023年第6期34卷 492-496页

作者： Qingqing Wang Huijuan Wu Aiping Gao Xuefei Ge Xueping Chang Xinhua Cao College of Chemistry and Chemical Engineering&Green Catalysis and Synthesis Key Laboratory of Xinyang city Xinyang Normal UniversityXinyang 464000China Department of Chemistry Fudan UniversityShanghai 200438China

Two bis-naphthalimide-based supramolecular gelators(NN-3 and NN-4)with a little difference of position of amino groups were designed and synthesized for the detection of oxaloyl chloride and *** transfer could be occurred between two naphthalimide groups in molecules NN-3 and *** gels NN-3 and NN-4 were formed in some mixed solvents,and nanofibers with different size were obtained in these *** self-assembly processes of NN-3 and NN-4 in different solvents were investigated by UV-vis absorption,fluorescent spectra,SEM,FTIR,XRD and *** NN-3 and NN-4 could selectively detect oxaloyl chloride in solution and film states,but detect phosgene only in ***-3exhibited the ratiometric detection ability towards oxaloyl chloride and phosgene with the low limit of detection(LOD)of 210 nmol/L and 90 nmol/L,***-4 as the corresponding control sample,it owned the higher LOD towards oxaloyl chloride and phosgene of 12.4μmol/L and 64μmol/L,***,films NN-3 and NN-4 could sensitively detect oxaloyl chloride gases with the low LOD of2.0 ppm and 8.34 ppm,*** detection mechanisms of NN-3 and NN-4 were well studied by1H NMR titration,HRMS and theoretical calculation.

关键词： Bis-naphthalimide Self-assembly colorimetric detection Multi-modes

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