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Sensors and actuators. B, Chemical 134건

  1. [해외논문]   Quantitative butyrylcholinesterase activity detection by surface-enhanced Raman spectroscopy   SCI SCIE SCOPUS

    Nechaeva, Natalia (Emanuel Institute of Biochemical Physics RAS, Moscow, Russia ) , Prokopkina, Taisiya (Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia ) , Makhaeva, Galina (Institute of Physiologically Active Compounds RAS, Chernogolovka, Russia ) , Rudakova, Elena (Institute of Physiologically Active Compounds RAS, Chernogolovka, Russia ) , Boltneva, Natalia (Institute of Physiologically Active Compounds RAS, Chernogolovka, Russia ) , Dishovsky, Christophor (Military Medical Academy, Sofia, Bulgaria ) , Eremenko, Arkadiy (Emanuel Institute of Biochemical Physics RAS, Moscow, Russia ) , Kurochkin, Ilya (Emanuel Institute of Biochemical Physics RAS, Moscow, Russia)
    Sensors and actuators. B, Chemical v.259 ,pp. 75 - 82 , 2018 , 0925-4005 ,

    초록

    Abstract The butyrylcholinesterase activity in human blood is an important marker of healthiness. Either level of this enzyme – increased or otherwise – can indicate disease or intoxication. The most popular technique to assess the cholinesterase activity is the detection of thiocholine, a product of enzymatic hydrolysis of butyrylthiocholine. In this work, Ag-paste was used as SERS-substrate and a new technique was created for thiocholine detection. As explained below, the designed technique facilitates also determination of butyrylcholinesterase (BChE) activity both in the buffer and in spike solution with human plasma. Ellman’s assay was used as a reference method, a good correlation between spectrophotometric detection and Raman detection was shown. Highlights A new stable SERS-substrates based on silver paste were obtained and characterized. SERS-substrates can be applied for thiocholine determination with the limit of detection 260 nM. Also, SERS-substrates are suitable for BChE activity detection both in the buffer and in spike solutions with plasma. The developed technique is label-free, inexpensive, and has the possibility to routine measurements of hundreds sample.

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  2. [해외논문]   Protein stabilized fluorescent gold nanocubes as selective probe for alkaline phosphatase via inner filter effect   SCI SCIE SCOPUS

    Sharma, Amit Kumar (Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan ) , Pandey, Sunil (Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan ) , Khan, M. Shahnawaz (Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan ) , Wu, Hui-Fen (Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan)
    Sensors and actuators. B, Chemical v.259 ,pp. 83 - 89 , 2018 , 0925-4005 ,

    초록

    Abstract We present a novel approach for the synthesis of unique template free protein stabilized gold nanocubes (PSGNCs) for sensing and quantification of alkaline phosphatase (ALP) in biological fluids. The unique wavelength independent excitation of PSGNCs and absorption of the final product of ALP catalysis, i.e., p-Nitrophenol (p-NP) at 405 nm was exploited for the inner filter effect (IFE) as a sensitive and efficient method to detect ALP. The limit of detection in aqueous solution and serum was found to be 1.616 U/L and 9.441 U/L, respectively. Highlights Synthesis of novel protein stabilized Gold Nanocubes (PSGNCs). The nanomaterial has unique excitation and emission property at 405 and 468 nm. The nano-cubes have been used for detection of extremely low concentrations of alkaline phosphatase. The phenomenon of inner filter effect (IFE) observed in the presence of enzyme product p-Nitrophenol is used for high sensitivity and selectivity.

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

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  3. [해외논문]   Metal free bioimaging reagent for intracellular citrate in prostate cancer cells using aryl boronate derivative   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 ) , Selvaraj, Muthusamy (Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul 02792, Republic of Korea ) , Lee, Yeonhee (Advanced Analysis Center, 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. 90 - 96 , 2018 , 0925-4005 ,

    초록

    Abstract A boronate group integrated on a triphenylimidazoleoxadiazolephenyl (TPIOP) moiety exhibited unusual sensing and detection abilities towards citrate. TPIOP boronate exhibited a bathochromic shift in its fluorescence emission upon interaction with citrate. Quantification of trace levels of citrate ions in the human body may aid in the diagnosis of prostate cancer and kidney malfunctions. Herein, a novel, metal-free sensing strategy for citrate was developed based on fluorimetric detection with TPIOP boronate. The fluorescence of TPIOP boronate increased linearly and was gradually red-shifted upon addition of citrate. The enhanced emission intensity was attributed to aggregation induced emission. The vacant ‘p’ orbital of boron in TPIOP boronate acts as a Lewis acid, and accepts electrons from citrate, which is a Lewis base. Upon binding, the hybridization geometry of boron changes from sp 2 trigonal planar to sp 3 tetrahedral. The TPIOP boronate-citrate aggregates increase the polarity of TPIOP-boronate, which caused the red shift in the fluorescence. Citrate could be detected visually using a UV lamp, as the probe changed from blue to green upon interaction with the analyte. The developed probe was applied for the visualization of endogenous citrate in PC3 live cells. Highlights A novel boronate derivative was designed and synthesized for use as a metal-free citrate sensor. The sensor changes color from blue to green in the presence of citrate. Sensor showed 500-fold selectivity over other carboxylates, and the LOD was 10 nM. This probe showed low cytotoxicity and can be utilized for the detection of citrate in live PC3 cells. 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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  4. [해외논문]   Hydrodynamic rotating motion of micromotors from femtosecond laser microfabrication   SCI SCIE SCOPUS

    Guan, Wei (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Lv, Chao (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Xu, Yi-Shi (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Yu, Yan-Hao (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Xia, Hong (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Niu, Li-Gang (State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China ) , Liu, Sen (State Key Labora) , Wang, Gong , Wang, Ying-Shuai , Sun, Hong-Bo
    Sensors and actuators. B, Chemical v.259 ,pp. 97 - 105 , 2018 , 0925-4005 ,

    초록

    Abstract The micro-motion of the machine is essential and valuable in environment, biology and medicine research. Environment-propelled micromotion can exhibit driven non-equilibrium behaviors. The energy conversation of micromotors from fluid environment would be an important power supply method for the distributed sensor network. Here, we report a kind of rotating motion of microturbines as micromotors driven by hydrodynamic liquid flow. By using femtosecond laser direct writing technology, the microturbine was fabricated, containing a simple and controllable structure of a fixed central axis and movable blades. The rotation speed could be controlled by the speed of flow, the blade tilt angle, the blade length and the blade number, and the rotation direction of microturbine could be decided by the tilt direction of blades. A dual linkage system constituted two microturbines could be designed and achieved. The ability to harness and control the power of motions appears an important requirement for further development of hydrodynamic flow-driven mechanical systems. Highlights A rotating motion of microturbines as micromotors was performed. The micromotors were driven by hydrodynamic liquid flow. The rotation speed and direction can be controlled by design parameters. A dual linkage system was achieved.

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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.

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

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  5. [해외논문]   3D-printed capillary circuits for rapid, low-cost, portable analysis of blood viscosity   SCI SCIE SCOPUS

    Oh, Sein (Department of Biomedical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea ) , Kim, Byeongyeon (Department of Biomedical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea ) , Lee, Jeong K. (Department of Life Science, Sogang University, Mapo-gu, Shinsu-dong, Seoul 121-742, Republic of Korea ) , Choi, Sungyoung (Department of Biomedical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea)
    Sensors and actuators. B, Chemical v.259 ,pp. 106 - 113 , 2018 , 0925-4005 ,

    초록

    Abstract Blood viscosity is an important rheological property that have a potential for the diagnosis and prognosis of hemorheological alterations; however, conventional viscometers typically rely on costly and sophisticated equipment for device operation and viscosity measurement that limits their use in resource-limited settings. We present a 3D-printed capillary circuit (3D-CC) technology that enables facile analysis of blood viscosity by hand-powered device operation and naked-eye readout. Parallel capillary networks serve as the fluidic comparators that allow direct comparison between the volumetric flow rates of a viscosity standard and a test fluid, while graduated fluidic chambers enable naked-eye readout of the volumetric signals. The 3D-CC platform was first characterized with Newtonian fluids in a relatively wide range of viscosities (4.8–71.2 cP) by simple operation, pulling and pushing the plunger of a syringe. The practical utility of the 3D-CC was then demonstrated by rapid, low-cost, portable analysis of whole blood under controlled shear-rate conditions (48.5–482.1 s −1 ). The proposed platform provides cost-effectiveness and simplicity of operation compared with conventional viscometers, making it suited for its widespread use in field-based applications. Highlights A 3D-printed capillary circuit technology for blood viscosity analysis. Newtonian fluid analysis in a wide range of viscosities (4.8–71.2 cP). Blood viscosity analysis under shear-rate conditions (48.5–482.1 s −1 ). Quantifying the degradation of stored blood as a quality-control application.

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

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  6. [해외논문]   Ultrasensitive in-vitro monitoring of monoamine neurotransmitters from dopaminergic cells   SCI SCIE SCOPUS

    Emran, Mohammed Y. (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Shenashen, Mohamed A. (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Mekawy, Moataz (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Azzam, Ahmed M. (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Akhtar, Naeem (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Gomaa, Hassenien (National Institute for Materials Science (NIMS), Research Center for Functional Materials, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 305-0047, Japan ) , Selim, Mahmoud M. (Department of Mathematics, Al-Aflaj College of Science and Human Studies, Prince Sattam Bin Abdulaziz Univ) , Faheem, Ahmed , El-Safty, Sherif A.
    Sensors and actuators. B, Chemical v.259 ,pp. 114 - 124 , 2018 , 0925-4005 ,

    초록

    Abstract The design of biosensing assay of monoamine neurotransmitters (MANTs) such as epinephrine (Ep), norepinephrine (NE), and dopamine (DA), as well as the monitoring of these MANTs released from dopaminergic cells, are of particular interest. Electrochemical sensors based on the novel construction of nickel oxides (NiO) were fabricated and employed for electrochemical screening of MANTs. A novel NiO-lacy flower-like (NLF) geometrical structure with semi-spherical head surfaces connected with a trunk as an arm was achieved. The designed semi-spherical head associated with abundant and the well-dispersed tubular branches with needle-like open ends might lead to the creation of vascular vessels for facile diffusion and suitable accommodation of the released MANTs throughout active and wide-surface-area coverage, multi-diffusive pores, and caves with connective open macro-/meso-windows along the entire top-view nanoneedles of lacy flower head and trunk. These electrode surfaces possess high-index catalytic site facets associated with the formation of ridges/defects on {110}-top-cover surface dominants for strong binding, fast response, and signaling of MANTs. The NLF- modified electrode enabled high sensitivity for MANTs and a low limit of detection of 6 nM. Ultrasensitive in-vitro monitoring of DA released from dopaminergic cells (such as PC12) was realized. The NLF electrode was used to detect MANTs from its sources (PC12), and it could be used for clinical diagnosis. Highlights Detection of ultra-trace concentrations of monoamine neurotransmitters in living cells. Low cytotoxicity and high biocompatibility of NLF. Highly sensitive biosensor for monoamine neurotransmitters up to 6 nM. Sensitive and selective assays of monoamine neurotransmitters. Graphical abstract The building of novel construction of modified electrode for monitoring of monoamine neurotransmitters (MANTs) secreted from dopaminergic cells was reported. PC12 is represented like human neuronal cells, and synthesize monoamine neurotransmitters along with cell induced by 20 mM K + for extracellular stimulation. DA secreted from PC12 cells is monitored at the NLF-modified electrode with high sensitivity and selectivity. [DISPLAY OMISSION]

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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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  7. [해외논문]   A facile indicator box based on Eu3+ functionalized MOF hybrid for the determination of 1-naphthol, a biomarker for carbaryl in urine   SCI SCIE SCOPUS

    Qin, Si-Jia (Corresponding author.) , Yan, Bing
    Sensors and actuators. B, Chemical v.259 ,pp. 125 - 132 , 2018 , 0925-4005 ,

    초록

    Abstract Carbaryl is the most frequently used carbamate pesticide in the agriculture field, which is associated with a series of potential adverse health impacts including neurological disorder and cancer. 1-naphthol (1-N), a metabolite of the insecticide carbaryl, is an established human biomarker used for assessing food intake and environmental exposure. The present study, amied to investigate the potential application of Eu 3+ functionalized metal-organic frameworks for the effective detection of the 1-N in human urine. We have synthesized and characterized a hybrid material through doping europium ions into 2,2′-bipyridine-based microporous MOF (MOF-253) using a post-synthesis modification strategy. The study shows a highly efficient recyclable luminescent probe Eu 3+ @MOF-253 for the detection of biomarker 1-N of exposure carbaryl with excellent sensitivity and rapid response time. Taken together, a low-cost homemade indicator box for the convenient detection of 1-N has been designed, which is recyclable and field portable and is an excellent candidate for potential application in personalized health monitoring. Highlights A low-cost homemade indicator box for to conveniently detect 1-N, a biomarker of carbaryl in urine. It is reliable, field portable, recyclable and highly sensitive for personal health monitoring. The luminescent probe is based on a hybrid by Eu 3+ functionalized MOF host. Graphical abstract A low-cost homemade indicator box for the convenient detection of 1-naphthol, the metabolic biomarker of carbaryl in urine, has been designed based on luminesvent probe through the Eu 3+ functionalized metal-organic frameworks. [DISPLAY OMISSION]

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

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  8. [해외논문]   Fabrication of a new electrochemical imprinted sensor for determination of ketamine based on modified polytyramine/sol-gel/f-MWCNTs@AuNPs nanocomposite/pencil graphite electrode   SCI SCIE SCOPUS

    Deiminiat, Behjat (Corresponding author.) , Rounaghi, Gholam Hossein
    Sensors and actuators. B, Chemical v.259 ,pp. 133 - 141 , 2018 , 0925-4005 ,

    초록

    Abstract This paper proposes a new strategy for measurement of ketamine through one-step electropolymerization of the molecularly imprinted polymer (MIP) composed of polytyramine (pty), sol-gel, functionalized multiwall carbon nanotubes@gold nanoparticles (f-MWCNTs@AuNPs) nanocomposite and ketamine on a pencil graphite electrode (PGE) by cyclic voltammetric (CV) technique. F-MWCNTs@AuNPs nanocomposite was entrapped within the polymer network to enhance the electron transfer rate and sensitivity of the fabricated sensor. The f-MWCNTs@AuNPs nanocomposite was synthesized by the chemical reduction method and its structure characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX). The electrochemical behavior of the modified electrode was investigated using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV) techniques. Under the optimized experimental conditions, the calibration curve of the MIP electrode was plotted and two dynamic linear ranges from 1.0 to 50.0 nM and 50.0–1000.0 nM, with a limit of detection (LOD) of 0.7 nM were obtained for quantitative measurement of ketamine in solution. The obtained results show that the proposed sensor has an excellent stability, good reproducibility and repeatability, and high sensitivity and selectivity towards the ketamine molecules. Furthermore, the electrochemical imprinted sensor was successfully applied for determination of ketamine in biological samples with satisfactory results. Highlights A novel electrochemical imprinted sensor was developed for determination of ketamine. F-MWCNTs@AuNPs nanocomposite was used to improve the sensor performance. The proposed sensor showed satisfactory applicability in biological samples.

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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.

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

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  9. [해외논문]   Simultaneous determination of codeine and its co-formulated drugs acetaminophen and caffeine by utilising cerium oxide nanoparticles modified screen-printed electrodes   SCI SCIE SCOPUS

    Khairy, Mohamed (Chemistry Department, Faculty of Science, Sohag University, 82524, Egypt. ) , Mahmoud, Bahaa G. (Chemistry Department, Faculty of Science, Sohag University, 82524, Egypt. ) , Banks, Craig E. (Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.)
    Sensors and actuators. B, Chemical v.259 ,pp. 142 - 154 , 2018 , 0925-4005 ,

    초록

    Abstract We report a facile and low-cost methodology for the simultaneous determination of codeine (COD) and its common co-formulated drugs acetaminophen (APAP) and caffeine (CAF) utilising cerium oxide nanoparticles modified screen-printed electrodes (CeO 2 -SPEs) for the first time. Interestingly, CeO 2 -SPEs offer a promising, sensitive, robust and chemically stable non-enzymatic electrochemical sensor for the simultaneous determination of APAP, COD and CAF without any interference / overlapping of voltammetric peaks/signals. The electro-analytical sensing of APAP, COD and CAF were explored using CeO 2 -SPEs over a wide concentration range with competitively low detection limits (3S/N) of 0.051, 0.043 and 2.4 μmol L −1 respectively. The CeO 2 -SPEs with nanoscale CeO 2 architectures exhibit practical analytical utility for the accurate and simultaneous determination of APAP, COD and CAF in human serum samples with excellent recoveries. The results show exceptional electrochemical performance of CeO 2 -SPEs in term of simplicity, stability and sensing abilities that can effectively reduce processing costs for scalable production and routine analysis. Highlights Simultaneous determination of APAP, COD and CAF on CeO 2 –SPE was explored for the first time. CeO 2 -SPE showed high sensitivity, stability and reproducibility compared to unmodified SPE. Low detection limits were estimated; 0.051, 0.043 and 2.4 μM for APAP, COD and CAF, respectively. CeO 2 -SPE was utilized for simultaneous determinations of APAP, COD and CAF in human fluids. Graphical abstract Simultaneous determination of acetaminophen, codeine and caffeine drugs using cerium oxide nanoparticles modified screen-printed electrodes (SPEs) is reported for the first time. The CeO 2 -SPEs shows stable, sensitive and reproducible electrochemical non-enzyme sensor without needs any tedious pre-treatment for real samples. [DISPLAY OMISSION]

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  10. [해외논문]   Highly sensitive naked eye detection of Iron (III) and H2O2 using poly-(tannic acid) (PTA) coated Au nanocomposite   SCI SCIE SCOPUS

    Fang, Yan (State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, PR China ) , Tan, Jiajun (School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Block N1.3, Singapore 637457, Singapore ) , Choi, Hyunjun (School of Chemical Engineering, Sungkyunkwan University, 16419, Republic of Korea ) , Lim, Sierin (School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Block N1.3, Singapore 637457, Singapore ) , Kim, Dong-Hwan (School of Chemical Engineering, Sungkyunkwan University, 16419, Republic of Korea)
    Sensors and actuators. B, Chemical v.259 ,pp. 155 - 161 , 2018 , 0925-4005 ,

    초록

    Abstract In the present study, we present a room temperature-, one-pot method for the synthesis of functional poly (tannic acid) (PTA)-based core@shell nanocomposites (core@PTA). The addition of tannic acid (TA) to gold (Au) salt solutions at mildly alkaline pH induced reduction of the metal salts to Au nanoparticles (NPs) while TA was oxidized and self-polymerized before encapsulating the AuNPs to form Au@PTA. Through the use of coordination chemistry, the synthesized Au@PTA was utilized as a naked eye sensor for iron (III) ions and H 2 O 2 . In the presence of Fe 3+ , Au@PTA aggregated and resulted in visible color change, showing high selectivity towards Fe 3+ with visual detection limit of 20 μM. Extension of the approach is used to detect H 2 O 2 with visual detection limit of 0.4 μM. Observation of the UV–vis spectra after the addition of analytes for the two detection systems revealed an additional peak in the H 2 O 2 detection system at ∼ 650 nm. This is due to the presence of “wire-like” oligomer structures in the H 2 O 2 detection system as opposed to nanocomposite aggregation observed in the former system. Highlights A one-step synthesis technique for core@shell nanocomposite. Cross-linker free poly-(tannic acid) as nanocomposite shell. Use of gold@poly-(tannic acid) nanocomposite as highly selective and sensitive Iron (III) and H 2 O 2 sensor. Naked eye read out sensor.

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