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Sensors and actuators. B, Chemical 134건

  1. [해외논문]   An investigation on NO2 sensing mechanism and shielding behavior of WO3 nanosheets   SCI SCIE SCOPUS

    Hua, Zhongqiu (Corresponding author.) , Tian, Chen , Qiu, Zhilei , Li, Yan , Tian, Xuemin , Wang, Mengjun , Li, Erping
    Sensors and actuators. B, Chemical v.259 ,pp. 250 - 257 , 2018 , 0925-4005 ,

    초록

    Abstract NO 2 sensor based on WO 3 nanosheets was fabricated and its basic sensing mechanism was investigated. It is found that sensor response of WO 3 nanosheets is linearly proportional with concentrations of NO 2 . It is revealed that the linear response could be theoretically derived from assumption of the grain controlled conductivity, which is caused by the tiny thickness of nanosheet. With the same assumption, the sensor resistance of WO 3 nanosheets can be analytically derived and expressed by NO 2 . However, in order to achieve a linear sensor response, NO 2 concentrations should be large enough to overcome an electronic shielding behavior of O 2 , which could cause an insensitive and non-linear sensor response. Based on the grain controlled conductivity, the electronic shielding behavior has been theoretically explained and found to be well consistent with experimental results observed in WO 3 nanosheets. Highlights A linear response of NO 2 is observed in WO 3 nanosheets and has been theoretically explained. An electronic shielding behavior of sensor resistive response is experimentally observed in WO 3 nanosheets. The shielding behavior of NO 2 is theorically explained and found to be well consistent with experimental results.

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  2. [해외논문]   H2S sensing mechanism of SnO2-CuWO4 operated under pulsed temperature modulation   SCI SCIE SCOPUS

    Simion, Cristian Eugen (National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania ) , Somacescu, Simona (“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania ) , Teodorescu, Valentin Serban (National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania ) , Osiceanu, Petre (“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania ) , Stanoiu, Adelina (National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania)
    Sensors and actuators. B, Chemical v.259 ,pp. 258 - 268 , 2018 , 0925-4005 ,

    초록

    Abstract This paper reports the sensing mechanism of SnO 2 -CuWO 4 mixed oxides towards H 2 S detection revealed through Pulsed Temperature Mode (PTM). After thick film deposition onto commercial substrates, the final annealing temperature enhances the material reliability through the changes occurred during the experimental conditions. PTM approach represents a tradeoff in terms of sensing mechanism versus sensing performance, in order to get insights about the fundamental aspects. The measurements have been done under dynamic gas flow conditions, in the presence of 50% relative humidity (RH). The gas sensors based on SnO 2 -CuWO 4 exhibit sensor signals higher than 100 to 10 ppm H 2 S, low cross-sensitivity to common gaseous interfering agents (CO, CH 4 , NH 3 , SO 2 ), average selective sensitivity of 8.64 towards the main interfering NO 2 gas, moderate response (4 min)/recovery (5 min) transients and power consumption. In order to emphasize the role of moisture towards H 2 S detection mechanism, the photoacoustic spectroscopic insights were correlated with Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy results. Such approach has shown promising aspects towards further operational sensitive devices. Highlights SnO 2 -CuWO 4 materials were synthesized by a versatile chemical synthesis route. TEM investigations revealed the existence of SnO 2 and C u1 + x WO 4 crystalline phases. XPS spectroscopy emphasized the increased affinity of SWC_800 towards OH groups. Pulsed Temperature Modulation reveals the sensing properties of SnO 2 -CuWO 4 . Sensitive selectivity to H 2 S and the sensing mechanism of SnO 2 -CuWO 4 has been addressed under infield conditions. Graphical abstract [DISPLAY OMISSION]

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  3. [해외논문]   Visible light-assisted room temperature gas sensing with ZnO-Ag heterostructure nanoparticles   SCI SCIE SCOPUS

    Zhang, Qiuping (State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China ) , Xie, Guangzhong (State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China ) , Xu, Ming (Key Laboratory of Information Materials of Sichuan Province, School of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu, 610041, China ) , Su, Yuanjie (State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China ) , Tai, Huiling (State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China ) , Du, Hongfei (State Key Laboratory of Elec) , Jiang, Yadong
    Sensors and actuators. B, Chemical v.259 ,pp. 269 - 281 , 2018 , 0925-4005 ,

    초록

    Abstract Noble metal-metal oxide nanohybrids play an ever-increasing role in photocatalytic applications. Here, a ZnO-Ag nanoparticle prepared by a modified polymer-network gel method was utilized for room temperature light-assisted NO 2 gas detection. Since a heterojunction forms between the two materials and surface oxygen vacancies increase, the sensitivities of the sensors to NO 2 gas (0.5–5 ppm) under various light (λ = 365–520 nm) illumination conditions are enhanced in comparison with those of pure ZnO sensor. Surface plasmon resonance (SPR) was found to result in the excellent visible-light performance of this ZnO-Ag nanostructure. More importantly, by tuning the working wavelength using different LED light sources, we can obtain an optimized sensitivity. When blue-green LED (470 nm, 75 mW/cm 2 ) is used, the 3 mol% Ag-loaded ZnO sensor shows the highest sensitivity as well as superior stability and selectivity. The effect of humidity on the sensor performance is also discussed in detail. Highlights A room temperature light-assisted gas sensor based on ZnO-Ag nanoparticles. Heterojunction and surface oxygen vacancies jointly enhance NO 2 sensing performances. Excellent visible-light performance arising from the SPR effect of the AgNPs. Elucidation of the mechanism behind the enhanced gas sensing properties. Superior gas-sensing performances indicate their potential in NO 2 gas detection. Graphical abstract A gas sensor based on ZnO-Ag nanoparticles is successfully developed for visible light-assisted gas detection. Because a heterojunction forms between the two materials and surface oxygen vacancies increase, the sensor exhibits excellent sensing performances toward NO2 gas at room temperature under light illumination. The optimal sensitivity can be obtained by tuning the working wavelength using different LED light sources. ZnO-Ag nanoparticles, heterostructure, oxygen vacancy, NO2 gas sensing, grain-boundary barrier. [DISPLAY OMISSION]

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  4. [해외논문]   Highly sensitive and selective RNase A recognition systems based on “OFF – ON – OFF” fluorescence probes   SCI SCIE SCOPUS

    Du, Jinya (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Yang, Huiran (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Huang, Na (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Dong, Yuzhi (College of Life Science, Hubei University, Wuhan 430062, PR China ) , Gao, Qingyun (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Yang, Wei (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Liu, Biao (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China ) , Yang, Changying (College of Biological and Pharmaceutical Science, China Three Gorges University, Yichang 443002, PR China)
    Sensors and actuators. B, Chemical v.259 ,pp. 282 - 288 , 2018 , 0925-4005 ,

    초록

    Abstract The “Switching – On” complexes, indolium derivatives bound with nuclear acids, were used as fluorescence probes to recognize the endonuclease and monitor the enzyme activities. Three probes, H1, L1 and N1, weakly emitted in aqueous buffer, exhibited strong red emissions when they bound into DNA or RNA. For H1-RNA or L1-RNA, the fluorescence was sensitively quenched by endoribonuclease, RNase A. The quenching of H1 or L1 originated only from the cleavage of RNase A to RNA, which was proved by various control and interference experiments. The specific recognition and highly sensitive enzyme activity assay of RNase A was simply conducted based on H1-RNA or L1-RNA “Switching-ON” fluorescent complex, and the detection limit (DL) is as low as 2.87 × 10 −7 U/mL for H1-RNA, and 5.02 × 10 −7 U/mL for L1-RNA, respectively. This approach was also used to evaluate the efficiency of inhibitors for RNase A. Highlights New fluorescence probes assay for monitoring endoribonuclease activity. The fluorescence “Switching – On” complex H1- RNA or L1-RNA exhibited highly specificity and selectivity for the target RNase A. This method showed high sensitivity with a detection limit of 2.87 × 10 −7 U/mL for endoribonuclease RNase A, which is much lower than many other reported. The enzyme assay is simply done for rapid qualitative and quantitative indication of endoribonuclease activities and inhibition capabilities in aqueous physiology, without separation or isotopic substrates labeling. Graphical abstract The specific recognition and highly sensitive assay of RNase A was conducted based on H1-RNA or L1-RNA fluorescence “Switching-ON” complex, and the detection limit is as low as 2.87 × 10 −7 U/mL. [DISPLAY OMISSION]

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  5. [해외논문]   Chemically functionalized 3D reticular graphene oxide frameworks decorated with MOF-derived Co3O4: Towards highly sensitive and selective detection to acetone   SCI SCIE SCOPUS

    Ding, Degong (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, PR China ) , Xue, Qingzhong (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, PR China ) , Lu, Wenbo (College of Science, China University of Petroleum, Qingdao, 266580, PR China ) , Xiong, Ya (College of Science, China University of Petroleum, Qingdao, 266580, PR China ) , Zhang, Jianqiang (College of Science, China University of Petroleum, Qingdao, 266580, PR China ) , Pan, Xinglong (College of Science, China University of Petroleum, Qingdao, 266580, PR China ) , Tao, Baoshou (College of Science, China University of Petroleum, Qingdao, 266580, PR China)
    Sensors and actuators. B, Chemical v.259 ,pp. 289 - 298 , 2018 , 0925-4005 ,

    초록

    Abstract Here, we have newly developed chemically functionalized three-dimension (3D) graphene oxide hydrogels (FGH) decorated with metal-organic frameworks (MOFs)-derived Co 3 O 4 nanostructures, in which the Co 3 O 4 nanostructures are uniformly distributed in 3D FGH frameworks. It is found that the Co 3 O 4 /FGH composites exhibits excellent acetone sensing properties, for instance, it shows an ultra-high response (R gas /R 0 = 81.2) to 50 ppm acetone, which was ∼20 times higher than that of pristine Co 3 O 4 film, a short response time (∼20 s), and a distinct cross-selectivity against other interfering gases. Notably, upon exposure to 1 ppm acetone in air, the composites still can express an apparent response (R gas /R 0 = 4.06). The excellent acetone sensing properties of Co 3 O 4 /FGH can be mainly attributed to the unique porous structures of 3D FGH frameworks and the modulation of electrical transport properties of the Co 3 O 4 /FGH junctions in the composites. The Co 3 O 4 nanostructures uniformly distributed in 3D FGH frameworks can easily adsorb a great amount of acetone gas molecules through the unique porous frameworks and produce a great deal of electrons, which can be transferred to the p-type FGH frameworks through Co 3 O 4 /FGH junctions so that the resistance of Co 3 O 4 /FGH composites is greatly increased. Therefore, the acetone response of the composites is dramatically enhanced because of the Co 3 O 4 /FGH junctions. This study presents a new idea of building MOF-derived oxides/FGH junctions to enhance gas response of oxide-based gas sensors, and has great potential in fabrication of new generation gas sensors. Highlights A new composite of chemically functionalized three-dimension (3D) graphene oxide hydrogels (FGH) decorated with metal-organic frameworks (MOFs)-derived Co 3 O 4 nanostructures were prepared. Co 3 O 4 /FGH composites exhibit excellent acetone sensing properties, and a distinct cross-selectivity against other interfering gases. The Co 3 O 4 /FGH composites shows an ultra-high response (R gas /R 0 = 81.2) to 50 ppm acetone, which was ∼20 times higher than that of pristine Co 3 O 4 film. The acetone response of the composites is dramatically enhanced because of the modulation of electrical transport properties of Co 3 O 4 /FGH junctions. Graphical abstract We have newly developed 3D FGH frameworks decorated with MOF-derived Co 3 O 4 nanostructures, which exhibits excellent acetone sensing properties (ultra-high response and distinct cross-selectivity). [DISPLAY OMISSION]

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  6. [해외논문]   The application of mitochondrial targetable pyronine-pyridinium skeleton in the detection of nitroreductase   SCI SCIE SCOPUS

    Yang, Ling (College of Chemistry, Chemical Engineering and Material Science, Soochow University, 199 Ren'Ai Road, Suzhou 215123, China ) , Niu, Jin-Yun (School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123, China ) , Sun, Ru (College of Chemistry, Chemical Engineering and Material Science, Soochow University, 199 Ren'Ai Road, Suzhou 215123, China ) , Xu, Yu-Jie (School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123, China ) , Ge, Jian-Feng (College of Chemistry, Chemical Engineering and Material Science, Soochow University, 199 Ren'Ai Road, Suzhou 215123, China)
    Sensors and actuators. B, Chemical v.259 ,pp. 299 - 306 , 2018 , 0925-4005 ,

    초록

    Abstract In this paper, a new compound ( 3 ) with pyronine-pyridine skeleton had a strong fluorescence at pH 5.0−9.0, while the emission turned off at pH = 1.0–2.0. It was a mitochondrial biomarker in cancer cells (KB, 4T1, HeLa) and normal cells (Ges-1, L929, WS1). Based on these above results, probe 1 with pyronine-pyridinium skeleton was further designed and prepared to detect nitroreductase (NTR). The nitrofuran group of probe 1 was reduced and eliminated upon addition of NTR and nicotinamide adenine dinucleotide (NADH) to produce compound 3 , and the d-PET process could be allowed in the pyronine-pyridinium structure of probe 1 but it was prohibited in the pyronine-pyridine skeleton of compound 3 after detection, hence probe 1 showed a nearly turn-on signal in red light region at 565–800 nm with emission maxima at 604 nm. The detection limit was calculated as low as 2.2 ng/mL. Furthermore, fluorescence imaging experiments with live HeLa and Ges-1 cells were performed, and probe 1 could serve as a mitochondrial targetable probe to detect nitroreductase in red channel. Highlights The rosamine (3) with pyronine−pyridine structure was designed, and it was a red emission mitochondrial targetable probe. Pyridinium salt based compound (1) was served as a mitochondrial targetable NTR probe; it has a low detection limit (2.2 ng/mL). Nearly OFF-ON response, red emission. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Biocompatible silica nanoparticles conjugated with azidocoumarin for trace level detection and visualization of endogenous H2S in PC3 cells   SCI SCIE SCOPUS

    Rajalakshmi, Kanagaraj (Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea ) , Nam, Yun-Sik (Advanced Analysis Center, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea ) , Youg, Sumin (Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea ) , Selvaraj, Muthusamy (Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea ) , Lee, Kang-Bong (Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea)
    Sensors and actuators. B, Chemical v.259 ,pp. 307 - 315 , 2018 , 0925-4005 ,

    초록

    Abstract The silica nanoparticles (SiO 2 NPs) conjugated with azidocoumarin (Cy-N 3 ) was applied for the selective and sensitive H 2 S detection, even when H 2 S was present in 1000-fold excess of other bio thiols and ions. In the silica nanoprobes, azide in the Cy-N 3 group acted as the recognition element, and the probe was biocompatible. The nanoprobe displayed blue emission at 456 nm and excitation at 367 nm. After introducing H 2 S into the probe solution, the fluorescent intensity at 456 nm increased linearly as a function of H 2 S concentration (correlation coefficient, 0.9970), and the limit of detection was 6 nM. The enhanced fluorescent emission intensity was due to H 2 S-mediated reduction of the electron-withdrawing azide into electron-donating amine. The SiO 2 NPs@Cy-N 3 and its reaction products with H 2 S (SiO 2 NPs@Cy-NH 2 ) were characterized by 1 H NMR and TEM. The probe also showed low cytotoxicity and could trace endogenous H 2 S in physiological pH. We therefore then successfully utilized it to detect H 2 S in living PC3 cells. The probe was also successfully employed for detection of H 2 S gas using Whatman papers coated with SiO 2 NPs@Cy-N 3 . Highlights Biocompatible chemosensor for H 2 S detection was developed using silica nanoparticles. H 2 S detection was achieved even in 1000-fold excess of other interferents. The lowest LOD was 6 nM under physiological conditions. The probe was successfully applied for H 2 S detection in live PC3 cells. The paper strip probe coated with silica nanoparticles successfully detected H 2 S. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   An intriguing signal-off responsive photoelectrochemical aptasensor for ultrasensitive detection of microcystin-LR and its mechanism study   SCI SCIE SCOPUS

    Du, Xiaojiao (Corresponding author.) , Jiang, Ding , Li, Henan , Hao, Nan , You, Tianyan , Wang, Kun
    Sensors and actuators. B, Chemical v.259 ,pp. 316 - 324 , 2018 , 0925-4005 ,

    초록

    Abstract A direct formatted photoelectrochemical (PEC) aptasensing platform was constructed for ultrasensitive microcystin-LR (MC-LR) detection with AgI-nitrogen-doped graphene (AgI-NG) composites as photocathode and aptamer as recognition element. The photocurrent of the AgI-NG composites was about 10.9 times higher than that of AgI. Furthermore, to investigate the sensing mechanism, the experiments with photoluminescence (PL) and time-correlated single-photon counting (TCSPC) technique were implemented as supporting evidence. The developed aptasensor can be used for MC-LR detection in fish samples. The experimental and theoretical efforts elucidate that the theory of flow directions of electron give reasonable explanation for the sensing process: prevailing electron-hole recombination constitutes a signal-off strategy, while electron transfer playing the leading role presents a signal-on performance. Impressively, we discovered that the sensing mechanism differed significantly when applied to the same analyte despite the commonality among the detecting configuration themselves, which is dependent by the interaction between the analyte MC-LR and transducer. For the detection process, in the presence of MC-LR, the specific recognition of the targets with the sensing interface would trigger the formation of the aptamer/MC-LR complex, resulting in reduced electron transfer rate, increased charge recombination, and hence quenched photocurrent intensity of the AgI-NG with detection limits of 0.017 pM. This work will help to complement the vital theoretical explanation about the underlying sensing mechanism, and future designing of PEC aptasensors. Highlights A ultrasensitive photoelectrochemical (PEC) aptasensor for detection of MC-LR is presented. AgI/NG was used as efficient PEC transducer for immobilizing the MC-LR aptamer. Photoluminescence technique provide solid support for the sensing mechanism. The PEC aptasensor was used to monitor MC-LR in fish samples.

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  9. [해외논문]   Mechanically programmed valving technology and the active flow switching application in centrifugal microfluidics   SCI SCIE SCOPUS

    Xiang, Jiwen (Corresponding author.) , Cai, Ziliang , Zhang, Yong , Wang, Wanjun
    Sensors and actuators. B, Chemical v.259 ,pp. 325 - 331 , 2018 , 0925-4005 ,

    초록

    Abstract Centrifugal microfluidic system (Lab-on-CD) is attractive for realizing the conventional laboratory processes on a single microfluidic platform. Efficient valving technology for centrifugal microfluidics is highly desired for fluidic sample regulation. This paper reports a new valving technology based on the intrinsic centrifugal force. The valving system is mechanically programed to achieve sequential control of fluidic samples. The performance of the valving system was tested using a microfluidic chip fabricated using 3D printing technology. The valve can be controlled by manipulating the rotational speed and showed good performance. The effect of the system’s physical parameters on the burst frequencies of the valve and the interaction between different valves were investigated both experimentally and theoretically. The burst frequencies of the valves can be tuned easily by changing the physical parameters of the mechanical system. An active flow switch was designed and tested based on sequential control of multiple valves. It is capable of operation at low rotation frequency with no requirement for reversed rotation direction as in other reported work. The valving system is highly reliable, compact, and easy to be fabricated. It works independent of the microfluidic chip, thus could be reversibly used and easily reconfigured for different application on the centrifugal platform. Highlights Designed, fabricated, and tested a new valving technology that can be mechanically programmed and used for control of multiple microvalves on a centrifugal platform without extra external actuation. Microfluidic components and channels were fabricated using 3D printing technology. The structure of the microfluidic chip was designed and fabricated to be compatible with pinch-type valve. An active flow switch was designed and tested based on sequential control of multiple valves. It is capable of operation at low rotation frequency with no requirement for reversed rotation direction as in other reported work.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  10. [해외논문]   A chemosensor to recognize N-acyl homoserine lactone in bacterial biofilm   SCI SCIE SCOPUS

    Das, Sujoy (Department of Chemistry, Visva-Bharati University, Santiniketan, 731235, W.B., India ) , Sarkar, Himadri Sekhar (Department of Chemistry, Visva-Bharati University, Santiniketan, 731235, W.B., India ) , Uddin, Md Raihan (Department of Microbiology, University of Calcutta, Kolkata, 700019, India ) , Mandal, Sukhendu (Department of Microbiology, University of Calcutta, Kolkata, 700019, India ) , Sahoo, Prithidipa (Department of Chemistry, Visva-Bharati University, Santiniketan, 731235, W.B., India)
    Sensors and actuators. B, Chemical v.259 ,pp. 332 - 338 , 2018 , 0925-4005 ,

    초록

    Abstract A simple, sensitive, and rapid assay has been developed for detection of N -acyl homoserine lactone ( HSL ) autoinducers involved in bacterial quorum sensing (QS) by a new coumarin appended rhodamine derivative ( RNC ) ensembled with Cu 2+ . RNC -Cu 2+ conjugate shows “turn on” fluorescence while binding with HSL s. The interaction of ensemble with HSL is found to be 1:1 stoichiometry on the basis of absorption and fluorescence titrations with the detection limit of 2.4 μM at neutral pH. NMR, IR titrations and DFT calculations were performed in order to demonstrate the sensing mechanism and the electronic properties of the receptor-donor complex. The present chemosensor improves upon any previous biosensor-based approaches to selectively quantitate HSL , both in cell-free and in whole-cell assay system. Highlights A new coumarin appended rhodamine derivative ( RNC ) ensembled with Cu 2+ ion was introduced. Interactions of the ensemble with N -acyl homoserine lactones ( HSL s) were well explained experimentally and theoretically. “Turn on” sensing was observed in bacterial biofilm of Gram-negative bacteria due to production of HSL s. The ensemble could offers probable therapeutic potentials against QS-mediated bacterial infections related to HSL s. Graphical abstract [DISPLAY OMISSION]

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