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Sensors and actuators. B, Chemical 134건

  1. [해외논문]   Edible sensors for meat and seafood freshness   SCI SCIE SCOPUS

    Dudnyk, Iuliia (Corresponding author.) , Janeč , ek, Emma-Rose , Vaucher-Joset, Joanne , Stellacci, Francesco
    Sensors and actuators. B, Chemical v.259 ,pp. 1108 - 1112 , 2018 , 0925-4005 ,

    초록

    Abstract Here, we present a sensor for food freshness based solely on food-derived material, specifically pectin and red-cabbage. As such the sensor film is edible and safe for use inside food packaging, facilitating its wide-spread use. The sensor is designed to be a colourimetric indicator of food freshness. It displays high sensitivity to gaseous amines and shows good agreement with standard degradation markers when tested against real food samples. The sensor was exposed to a series of synthetic amines including ammonia, cadaverine and pyridine, and showed colourimetric changes accompanied by changes in the films’ UV-VIS absorption spectra. When exposed to the headspace above beef, chicken, shrimp or whiting (fish) samples the sensors showed clear colourimetric changes as the food samples degraded. Visual and measured changes in the films absorption showed good agreement with increases in total volatile basic nitrogen and total aerobic colony counting as measured in the food samples by standard E.U. methods and ISO 4833:2003 respectively, demonstrating the films’ utility as a food freshness sensor. Highlights The sensor presented is based solely on food-derived materials, specifically pectin and red-cabbage. The sensor film is edible and safe for use inside food packaging, facilitating its wide-spread use. The edible sensor film has high sensitivity for gaseous amines with a clear colourimetric change at concentrations as low as 1 ppm. The sensor films tested against degrading fishery and meat sample showed that colourimetric changes in the sensor film agreed well with increases in TVB-N and increases in bacterial colonies (TACC), key indicators of spoilage.

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  2. [해외논문]   Feasibility study of ethylone determination in seized samples using boron-doped diamond electrode associated with solid phase extraction   SCI SCIE SCOPUS

    Scheel, Guilherme Luiz (Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil ) , de Oliveira, Fernanda Midori (Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil ) , de Oliveira, Leandro Luan Gonç (Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil ) , alves (Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil ) , Medeiros, Roberta Antigo (Departamento de Química, Universidade Federal de Minas Gerais, CEP 31270-901, Belo Horizonte, MG, Brazil ) , Nascentes, Clé (Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil) , sia Cristina , Tarley, Cé , sar Ricardo Teixeira
    Sensors and actuators. B, Chemical v.259 ,pp. 1113 - 1122 , 2018 , 0925-4005 ,

    초록

    Abstract Ethylone is a synthetic cathinone recently found in illicit drugs, due to its similar central nervous system-stimulation properties with ‘ecstasy’. Due to the necessity of a rapid and routine on-site determination of ethylone in illicit drugs, electrochemical techniques seem to be an advantageous analytical tool. In this report, a novel voltammetric method using a boron-doped diamond electrode to determinate ethylone was developed and applied in seized street drugs. Electrochemical behavior of ethylone was studied by cyclic, differential pulse (DPV) and square-wave voltammetry (SWV). Chemometric approach was applied for determining ethylone by DPV and SWV. Validation parameters, such as linear range, limit of quantification and detection, precision and accuracy, were evaluated by SWV. Adulterants typically found in seized street drugs were also evaluated as possible interfering compounds. It was observed that oxidation peaks of ethylone and caffeine overlapped, whose interference was further overcome by previous solid phase extraction with octadecyl silica (C 18 ) as sorbent to eliminate the interfering effect of caffeine. The developed method was applied in seized samples and the accuracy was attested by comparison with HPLC-DAD. The results found using the developed electroanalytical methodology enabled to gather some information about the content and amount of ethylone present in seized street drugs found in Brazil. Highlights For the first time a voltammetric method has been reported for ethylone determination in seized street drugs. The boron-doped diamond (BDD) electrode fouling was not observed and common adulterants did not exert interference on ethylone determination. The association of boron-doped diamond (BDD) electrode with solid-phase extraction (SPE) was very useful to overcome the caffeine interference. Graphical abstract [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.

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

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  3. [해외논문]   Exploring factors for uniformly distributing liquid droplets in a bifurcation tree microfluidic chip   SCI SCIE SCOPUS

    Chen, Pin-Chuan (Corresponding author.) , Tsai, Chin-Mao
    Sensors and actuators. B, Chemical v.259 ,pp. 1123 - 1132 , 2018 , 0925-4005 ,

    초록

    Abstract Our objective was to develop an accurate bifurcation tree microfluidic chip and to identify factors influencing the uniform distribution of liquid plugs. Factors such as flow rate, microchannel length between bifurcation features, and geometry of daughter microchannels were examined on polymeric microfluidic platform. Three types of microfluidic chips (1-to-2 chip, 1-to-4 chip, and 1-to-8 chip) were micromachined on PMMA substrates, and the microchannels were sealed using thermal bonding. Twenty experiments were repeated on each chip and numerical simulations were used to explain the observed phenomena. From the experiments and simulations, we draw the following conclusions: (1) The average deviation among daughter plugs increased with the number of bifurcations, as follows: 1-to-2 chip (1.43%), 1-to-4 chip (5.76%), and 1-to-8 chip (12.97%). (2) The mother plug flow rate was shown to be crucial to distribution uniformity, as demonstrated in experiments on 1-to-2 microfluidic chips. (3) Longer daughter channels between consecutive bifurcations tend to mediate flow resulting in more uniform distribution, as demonstrated in experiments on 1-to-4 microfluidic chips. (4) The geometry of daughter microchannels could be adjusted to minimize the bouncing of the daughter liquid plugs after splitting in order to enhance the uniformity of distribution and reduce reagent loss. Highlights The 1-to-8 bifurcation tree microfluidic chip in this study achieved distribution deviation of only 12.97% with reagent loss of 8.88%. Increasing the injecting flow rate of the mother plug could improve the distribution uniformity due to override the tiny geometrical defects. Lengthening the daughter microchannels between consecutive bifurcation features could mediate the liquid and enhance distribution uniformity. A design with a wider upper microchannel and a narrow lower microchannel could enhance distribution uniformity.

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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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  4. [해외논문]   Sensitive and selective turn-off-on fluorescence detection of Hg2+ and cysteine using nitrogen doped carbon nanodots derived from citron and urine   SCI SCIE SCOPUS

    Xavier, S. Stanly John (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) , Siva, G. (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) , Annaraj, J. (Department of Materials Science, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) , Kim, Ae Rhan (R&D Center for CANUTECH, Business Incubation Center and Department of Bioenvironmental Chemistry, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea ) , Yoo, Dong Jin (Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, and Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea ) , kumar, G. Gnana (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India)
    Sensors and actuators. B, Chemical v.259 ,pp. 1133 - 1143 , 2018 , 0925-4005 ,

    초록

    Abstract An environmentally benign and cost efficient cysteine fluorescence sensor is constructed on the basis of nitrogen doped carbon nanodots (NCNDs) prepared by using citron fruit extract and human urine waste as carbon and nitrogen sources, respectively. The turn-off-on fluorescence technique is exploited for the sensing of cysteine, in which the initial fluorescence of NCNDs is quenched with Hg 2+ via an electron transfer process. Owing to the competitive binding of Hg 2+ with cysteine, the ‘turn-off’ fluorescence sensor is switched to the ‘turn-on’ state. Under optimized conditions, NCNDs-Hg 2+ assembly demonstrates a lower detection limit and a wide linear range toward cysteine detection. Furthermore, NCNDs display the discriminative detection of cysteine from the similar bioactive molecules and the co-existence of interference species does not influence the detection of NCNDs toward the interest of an analyte. Furthermore, the practical application of NCNDs based fluorescence sensor is validated with the good recovery in human urine samples, which explores the new avenues in the fluorescence sensing of biomolecules. Highlights Environmentally benign NCNDs are prepared from citron and human urine. Turn-off-on fluorescence technique is exploited for the cysteine sensing. Fluorescence behavior of NCNDs is quenched with Hg 2+ and is regenerated with cysteine. NCNDs exhibit rapid fluorometric response with a LOD of 40 nM toward cysteine. NCNDs demonstrate selective cysteine detection and real sample analysis. Graphical abstract [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.

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

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