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Sensors and actuators. B, Chemical 134건

  1. [해외논문]   Dual-channel mid-infrared sensor based on tunable Fabry-PErot filters for fluid monitoring applications   SCI SCIE SCOPUS

    Rauscher, Markus S. (Corresponding author.) , Schardt, Michael , Kö , hler, Michael H. , Koch, Alexander W.
    Sensors and actuators. B, Chemical v.259 ,pp. 420 - 427 , 2018 , 0925-4005 ,

    초록

    Abstract In this article, the design and application of an optical sensor for fluid monitoring based on two tunable Fabry-PErot filters is presented. The sensor enables fluid transmission measurements in the spectral ranges from 1818 cm −1 to 1250 cm −1 and from 1250 cm −1 to 952 cm −1 at wavenumber-dependent resolutions between approximately 20 cm −1 and 33 cm −1 . A novel method is proposed to ensure a correct wavenumber representation of the obtained spectra, correcting for an oblique light path in the optical system. The sensor shows high linearity and a low noise level for absorbance measurements. As an example for a fluid monitoring application, the transmission spectra of deteriorated automotive engine oil samples were measured and compared to spectra obtained with a Fourier-transform infrared spectrometer. We used partial least squares (PLS) regression to construct calibration models for the prediction of significant oil condition parameters, like oxidation, sulfation, water content and viscosity, from the obtained spectra. The values predicted from the absorption spectra show high correlation with reference values of the oil condition parameters determined in a laboratory according to appropriate standards. These results indicate that the sensor can be a useful supplementary tool for fast and cost-effective engine oil condition monitoring. Highlights The development of a mid-infrared spectroscopic fluid sensor is presented. The sensor is based on two miniaturized tunable Fabry-PErot filters. Spectra of deteriorated engine oil samples are measured and compared. The wavenumber shift of the spectra is algorithmically corrected. Multivariate methods enable an accurate prediction of oil condition parameters.

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  2. [해외논문]   Pathogenic detection and phenotype using magnetic nanoparticle-urease nanosensor   SCI SCIE SCOPUS

    Sun, Yun (State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, China ) , Fang, Linyi (State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, China ) , Wan, Yi (State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, China ) , Gu, Zhifeng (State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, China)
    Sensors and actuators. B, Chemical v.259 ,pp. 428 - 432 , 2018 , 0925-4005 ,

    초록

    Abstract The diagnoses of bacterial infections remain a challenge in environment safety and human health area. Nanomaterial-based ‘enzyme nose’ sensor is a useful analytical technique for the detection of toxicologically important targets in biological samples. In this paper, we used three quaternized magnetic nanoparticles–urease sensors to detect bacteria with excellent sensitivity for several gram-positive or gram-negative bacteria. The response intensity of the nanoarray sensor is dependent on the level of displacement determined by three quaternized magnetic nanoparticles–urease binding strength and pathogenic cells–nanoparticles interaction. Based on the ability of urease to hydrolyze urea and increase the pH value of the system, the detection of pathogen is translated into a pH increase, which can be readily detected using a litmus dye. These characteristic responses of color show repeatable pathogenic cells and can be differentiated by principle component analysis (PCA). Our approach has been used to measure bacteria with an accuracy of 90.7% for 10 2 cfu mL −1 within 30 min. The measurement system has a potential for further applications and provides a facile and simple method for the rapid analysis of pathogens. Highlights The response of nanoarray sensor is dependent on the level of displacement by MNP–Urease complex. The qMNP–Urease sensors to detect bacteria with good sensitivity for bacteria. The method can measure bacteria with an accuracy of 90.7% for 10 2 cfu mL −1 within 30 min. Graphical abstract Based on the ability of urease to hydrolyze urea and increase the pH value of the system, the detection of pathogen is translated into a pH increase, which can be readily detected using a litmus dye. [DISPLAY OMISSION]

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  3. [해외논문]   Electrodeposition synthesis of a NiO/CNT/PEDOT composite for simultaneous detection of dopamine, serotonin, and tryptophan   SCI SCIE SCOPUS

    Sun, Danfeng (Tianjin Key Laboratory of Film Electronic and Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, PR China ) , Li, Hongji (Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, PR China ) , Li, Mingji (Tianjin Key Laboratory of Film Electronic and Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, PR China ) , Li, Cuiping (Tianjin Key Laboratory of Film Electronic and Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, PR China ) , Dai, Hongli (Tianjin Key Laboratory of Film Electronic and Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, PR China ) , Sun, Dazhi (Tianjin Key Laboratory of Film Electronic and Communicate Devices, School of Electrical and Electronic Eng) , Yang, Baohe
    Sensors and actuators. B, Chemical v.259 ,pp. 433 - 442 , 2018 , 0925-4005 ,

    초록

    Abstract A novel NiO/carbon nanotube (CNT)/poly(3,4-ethylenedioxythiophene) (PEDOT) composite with a coaxial tubular nanostructure was successfully deposited on a glassy carbon electrode (GCE) through electrochemical processes. The outer PEDOT matrix has a high affinity for biomolecules, while the CNT inner layer has a strong electron-transport capacity. Hence, the NiO/CNT/PEDOT/GCE was used for the simultaneous determination of dopamine (DA), serotonin (5-HT), and tryptophan (Trp). Electrochemical responses of the NiO/CNT/PEDOT/GCE sensor were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry. Three well-separated oxidation peaks were observed in a mixed system containing DA, 5-HT, and Trp; the 5-HT–DA and Trp–5-HT potential separations were 160 and 324 mV, respectively, owing to the synergistic effect of NiO, CNT, and PEDOT. Linear responses were obtained for DA, 5-HT, and Trp in the 0.03–20, 0.3–35, and 1–41 μM concentration ranges, with detection limits of 0.026, 0.063, and 0.210 μM, respectively. In addition, it was possible to simultaneously determine the three analytes using the NiO/CNT/PEDOT composite, which suggests that the sensor has promising applicability. Highlights A NiO/CNT/PEDOT nanocomposite was electrochemically synthesized in one step. The composite is a coaxial-structured nanotube of CNT and NiO/PEDOT layer. The formation mechanism of the composite and its electrochemical properties were analyzed. Sensors based on the composite can simultaneously detect DA, 5-HT, and Trp in serum. The composite sensors showed high sensitivity, selectivity, and stability. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   Kinetic approach to receptor function in chemiresistive gas sensor modeling of tin dioxide. Steady state consideration   SCI SCIE SCOPUS

    Brinzari, V. (Department of Physics and Engineering, Moldova State University, Chisinau, MD, 2009, Republic of Moldova, ) , Korotcenkov, G. (Gwangju Institute of Science and Technology, Gwangju, 500-712, Republic of Korea)
    Sensors and actuators. B, Chemical v.259 ,pp. 443 - 454 , 2018 , 0925-4005 ,

    초록

    Abstract Kinetic approach in phenomenological modeling of SnO 2 chemiresistive gas sensor is proposed. It is based on a new perception of chemisorbed oxygen forms and consistent account of main reaction rates into a balance equation of particles on (110) surface. So-called receptor function was considered for dry and humid atmosphere and in the presence of CO. Transducer function was calculated within an electron filtering model. Numerical simulation of the surface coverage by oxygen and major gas sensing characteristics of SnO 2 within 150–600 °C temperature range showed sufficient agreement with experimental behavior of nanocrystalline SnO 2 -based sensors. Model allows interpretation of some of the important features in these characteristics. Highlights A role of atomic forms of chemisorbed oxygen on (110)SnO 2 surface was reconsidered. A kinetic approach to SnO 2 gas sensor (GS) receptor function was proposed. Rate equations for the initial state, interaction with CO and H 2 O were derived. A transducer function was described in the framework of electron filtering model. Simulation of the main GS characteristics in the range of 150–55 °C was done.

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  5. [해외논문]   Blood heparin sensor made from a paste electrode of graphite particles grafted with molecularly imprinted polymer   SCI SCIE SCOPUS

    Yoshimi, Yasuo (Corresponding author.) , Yagisawa, Yuto , Yamaguchi, Rina , Seki, Maki
    Sensors and actuators. B, Chemical v.259 ,pp. 455 - 462 , 2018 , 0925-4005 ,

    초록

    Abstract A real-time heparin monitor could be used to optimize the dosage of heparin during extracorporeal circulation procedures. This report describes the development of a graphite-paste (GP) electrode with molecularly imprinted polymer (MIP) grafted onto it. Heparin-imprinted poly (methacryloxyethyltriammonium chloride - co - acrylamide - co - methylenebisacrylamide) was grafted directly onto graphite particles. The grafted particles were thoroughly mixed with oil to fabricate the MIP-GP electrode. Traditional cyclic voltammetry was performed with the electrode in physiological saline or bovine whole blood containing 5 mM ferrocyanide and 0–8 units/mL heparin. The current intensity increased with heparin concentration, due to expansion of the effective surface area resulting from heparin-promoted mobility of the oil in the MIP-GP electrode. No significant difference was found in the sensitivity of the current to unfractionated heparin among the electrodes fabricated because of the electrode homogenization resulting from thorough mixing of the MIP-grafted particles and oil. (A previous MIP-grafted indium tin oxide electrode exhibited lower sensitivity in blood than in saline.) Only 60 s were needed to stabilize the current. The current at the MIP-GP electrode was also sensitive to low-molecular-weight heparin in blood, but insensitive to chondroitin sulfate C (CSC), which is a heparin analog. The non-imprinted polymer (NIP)-grafted electrode was insensitive to heparin. Thus, the MIP-GP electrode, which operated through a new heparin-sensing mechanism, is an excellent candidate for application as a disposable sensor to monitor heparin levels in blood. Highlights Heparin imprinted polymer was grafted onto graphite particles directly. The paste electrode of the grafted graphite is sensitive to heparin. The electrode response is reproducible due to homogenization of the particles. Surface area of the imprinted electrode is increased by the specific interaction. The heparin-imprinted electrode can detect low molecular weight heparin. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Potentiometric aptasensing of small molecules based on surface charge change   SCI SCIE SCOPUS

    Lv, Enguang (Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Provincial Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, PR China ) , Ding, Jiawang (Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Provincial Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, PR China ) , Qin, Wei (Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Provincial Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, PR China)
    Sensors and actuators. B, Chemical v.259 ,pp. 463 - 466 , 2018 , 0925-4005 ,

    초록

    Abstract Solid-state potentiometric sensors based on surface charge change are well-established tools for measuring ions and biological species. However, their use for detection of small molecules with high sensitivity and good selectivity is still elusive. In this work, a novel potentiometric aptasensing platform for small molecules is presented, using bisphenol A (BPA) as a model. The proposed sensor can be prepared by layer-by-layer assembling of carboxylated multiwall carbon nanotubes, poly(diallyldimethylammonium chloride) (polycation), and aptamer (polyanion) on the electrode surface. The presence of BPA induces the conformational change and detachment of the aptamer at the surface of the modified electrode, which leads to a variation of the surface charge (negative to positive) and therefore a potential change. The introduction of polyions can cause substantial charge change on the electrode surface, thus improving the sensitivity of the sensor. The morphology and electron-transfer properties of the electrode have been characterized. Under optimum conditions, the present sensor shows a stable response to BPA in the concentration range from 3.2 × 10 −8 to 1.0 × 10 −6 M with a detection limit of 1.0 × 10 −8 M. The proposed methodology can be used for sensitive potentiometric sensing of other small molecules involved in aptamer/target binding events. Highlights A potentiometric aptasensor with improved sensitivity is described. The sensing film can be prepared via a layer-by-layer assembly process. The introduction of polyions leads to an enhancement of sensitivity. The aptamer/target binding causes surface charge change. Graphical abstract A potentiometric aptasensing platform for small molecules with improved sensitivity is presented. Bisphenol A (BPA), as a small molecule was selected as a model. [DISPLAY OMISSION]

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  7. [해외논문]   Preparation of bright fluorescent polydopamine-glutathione nanoparticles and their application for sensing of hydrogen peroxide and glucose   SCI SCIE SCOPUS

    Tang, Li (Corresponding authors. ) , Mo, Shi (Corresponding authors.) , Liu, Shi Gang , Li, Na , Ling, Yu , Li, Nian Bing , Luo, Hong Qun
    Sensors and actuators. B, Chemical v.259 ,pp. 467 - 474 , 2018 , 0925-4005 ,

    초록

    Abstract A novel water-soluble fluorescent polydopamine derivative, polydopamine-glutathione nanoparticles (PDA-G (-S-)NPs), was synthesized by the Michael addition reaction between dopamine (DA) and reduced glutathione (GSH). Compared to a direct polymerization of dopamine, the as-prepared PDA-G (-S-)NPs have stronger fluorescence emission intensity. Also, the synthesis does not need any hazardous organic solvents and the process is simple. Additionally, the roles of GSH and hydrogen peroxide (H 2 O 2 ) in enhancing the fluorescence intensity are discussed in detail. The thioether in PDA-G (-S-)NPs is easily oxidized by hydrogen peroxide to sulfoxide and sulfone groups, accompanied by a decrease in fluorescence intensity. Therefore, the PDA-G (-S-)NPs can be applied to construct a fluorescent sensor for the sensitive detection of hydrogen peroxide. Based on the transformation of glucose into gluconic acid and H 2 O 2 in the presence of glucose oxidase, the PDA-G (-S-)NPs system was further utilized to sensing glucose. The linear ranges and detection limits of hydrogen peroxide and glucose are (0.5–6 μM, 2–130 μM) and (0.15 μM, 0.6 μM), respectively. Highlights GSH was used as a surface modifier to enhance the fluorescence of polydopamine. The synthesis of the nanoparticles is simple without involving in organic solvents. A rapid fluorescent sensor for hydrogen peroxide and glucose was obtained. The probe has a good practicability for practical sample detection. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   Electrothermal silver nanowire thin films for In-Situ observation of thermally-driven chemical processes   SCI SCIE SCOPUS

    Martí (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil ) , nez, Eduardo D. (CCNH, Federal University of ABC (UFABC), 09210-580, Santo André, SP, Brazil ) , Garcí (División Bajas Temperaturas, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, CONICET, Av Bustillo 9500, S.C. Bariloche, R8402AGP, Río Negro, Argentina ) , a Flores, Alí (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil ) , F. (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil) , Pastoriza, Herná , n , Urbano, Ricardo R. , Rettori, Carlos
    Sensors and actuators. B, Chemical v.259 ,pp. 475 - 483 , 2018 , 0925-4005 ,

    초록

    Abstract We develop a novel device comprised of high optical transmittance thin films containing silver nanowires (AgNWs) in poly(methyl methacrylate) (PMMA) acting as heating elements. The electrothermal control of the AgNWs network allows us to externally trigger and tune the temperature conditions required to run chemical reactions and physicochemical processes. The device was successfully applied for the spectroscopic in-situ observation of three different model reactions: i) the thermal equilibrium of a CoCl 2 /HCl/H 2 O complex, ii) the reversible macromolecular phase transition of a pNIPAM solution, and iii) the nucleation and growth of gold nanoparticles (AuNPs). In the first case, the color of the Co 2+ complex was reversibly switched from pink to blue when changing the thermal equilibrium condition. In the second one, the optical transmittance of an aqueous solution of carboxylic-terminated pNIPAM polymer was cycled from high to low as the temperature of the solution was below or above the lower critical solubility temperature (LCST) respectively. Finally, the electrothermal control on the device was applied to the study of the nucleation and growth of AuNPs in an organic solution of AuCl 3 containing oleylamine acting as both the reducer and the stabilizing agent. The versatility of the electrothermal device provides an easy way to undertake thermally controlled processes and develop optical elements such as smart windows and lab-on-a-chip devices. The AgNWs-PMMA nanocomposite was also applied successfully as an electrothermal ink on the external side walls of a test tube. Highlights Silver nanowires/PMMA nanocomposites for thin film semitransparent conductors. Electrical external control of the film temperature. Electrothermal device for studies on temperature-driven physicochemical processes in solutions and colloids. Transparent reactor with external temperature control for in-situ synthesis of metallic nanoparticles. Silver nanowires/PMMA nanocomposite ink for direct application as heater elements on different geometries and materials. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   A water-soluble fluorescent chemosensor having a high affinity and sensitivity for Zn2+ and its biological application   SCI SCIE SCOPUS

    Li, Qing-Feng (The Key Laboratory of Rare Earth Functional Materials and Applications, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou Normal University, Zhoukou, 466001, China ) , Wang, Jin-Tao (The Key Laboratory of Rare Earth Functional Materials and Applications, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou Normal University, Zhoukou, 466001, China ) , Wu, Shuyi (Department of Prosthodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, 510055, China ) , Ge, Gen-Wu (The Key Laboratory of Rare Earth Functional Materials and Applications, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou Normal University, Zhoukou, 466001, China ) , Huang, Jingbin (The Key Laboratory of Rare Earth Functional Materials and Applications, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou Normal University, Zhoukou, 466001, China ) , Wang, Zhenling (The Key Laboratory of Rare Earth Functional Materials and Applications, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou N) , Yang, Piaoping , Lin, Jun
    Sensors and actuators. B, Chemical v.259 ,pp. 484 - 491 , 2018 , 0925-4005 ,

    초록

    Abstract A water soluble 8-aminoquinoline based fluorescent Zn 2+ chemosensor (AQZ-2COOH) containing two carboxylic groups has been synthesized. The designed two carboxyl groups not only greatly improved the water solubility of this chemosensor but also increased its affinity for Zn 2+ . It has been proved that AQZ-2COOH, a pentadentate N, O-chelating ligand was able to coordinate with Zn 2+ through three nitrogen atoms and two oxygen atoms, resulting in the formation of a stable Zn 2+ complex, and the binding constant between AQZ-2COOH and Zn 2+ was determined to be 3.6 × 10 9 M −1 . Furthermore, AQZ-2COOH shows 39-fold fluorescence enhancement upon binding of Zn 2+ in aqueous solution. However, this remarkable emission enhancement did not occur when other metal ions were present. Further study revealed that AQZ-2COOH had low biotoxicity, and live cell imaging showed that AQZ-2COOH can be efficiently phagocytized by HeLa cells, a visible green fluorescence from the intracellular area was observed after incubation with AQZ-2COOH and Zn 2+ for 3 h, suggesting that AQZ-2COOH can be a promising candidate for detection of mobile Zn 2+ in biological systems. Highlights A water soluble fluorescent chemosenor with high affinity and sensitivity for Zn 2+ was developed. The designed two carboxyl groups which played the role of solubilization was involved in the coordination of Zn 2+ . The chemosenor can selectively detect Zn 2+ via a chelation induced enhanced fluorescence effect. The chemosenor was successfully applied for bio-imaging of Zn 2+ in HeLa cell. Graphical abstract A water-soluble, selective fluorescent chemosensor with high affinity for Zn 2+ was developed for bio-imaging application. [DISPLAY OMISSION]

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  10. [해외논문]   High sensitivity gram-negative bacteria biosensor based on a small-molecule modified surface plasmon resonance chip studied using a laser scanning confocal imaging-surface plasmon resonance system   SCI SCIE SCOPUS

    Li, Yasi (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China ) , Zhu, Jiawei (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China ) , Zhang, Hongyan (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China ) , Liu, Weimin (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China ) , Ge, Jiechao (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China ) , Wu, Jiasheng (Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, C) , Wang, Pengfei
    Sensors and actuators. B, Chemical v.259 ,pp. 492 - 497 , 2018 , 0925-4005 ,

    초록

    Abstract The highly sensitive and rapid detection and distinction of gram-negative bacteria are essential for the early diagnosis and accurate medical treatment of bacterial infection. In this work, we investigated a new selective and sensitive method of detecting gram-negative bacteria based on a small molecule modified sensor chip by a laser scanning confocal imaging-surface plasmon resonance (LSCI-SPR) system. The small molecule (polymyxin B) strongly interacted with bacteria cell membrane. SPR signals changed with SYTO 9 stained bacteria concentrations, and fluorescence images were recorded at the same time. Results showed that Escherichia coli were distinguished clearly with a limit of detection (LOD) of 1.0 × 10 2 CFU/mL for Escherichia coli . Moreover, a good linear relationship was observed between bacteria concentrations and SPR signals from 1.0 × 10 2 CFU/mL to 1.0 × 10 6 CFU/mL with a linear coefficient R 2 of 0.99146. All these results indicated that this small-molecule modified sensor can be used for quantitative detection of known gram-negative bacteria and qualitative distinction of unknown gram-negative bacteria within 10 min each sample in real-time. Highlights A new highly selective and sensitive method for detecting gram-negative bacteria was investigated. Gram-negative bacteria can be distinguished from gram-positive bacteria and fungi based on polymyxin B modified SPR sensor chip. A LOD of 1.0 × 10 2 CFU/mL was reached for E. coli and bacteria concentrations have a good linear relationship with SPR signal. The results indicated that sensor has potential further application in sensitive and rapid detection gram-negative bacteria in real-time. Graphical abstract [DISPLAY OMISSION]

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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