Artificial Taste Sensor:  Efficient Combination of Sensors Made from Langmuir−Blodgett Films of Conducting Polymers and a Ruthenium Complex and Self-Assembled Films of an Azobenzene-Containing Polymer

Riul, Antonio; Santos, David S. dos; Wohnrath, Karen; Tommazo, R. Di; Carvalho, André C. P. L. F. de; Fonseca, Fernando Josepetti; Oliveira, Osvaldo N.; Taylor, David; Mattoso, Luiz H. C.

doi:10.1021/la011017d

Cited by 179 publications

(139 citation statements)

References 24 publications

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“…Electrochemical measurements and impedance spectroscopy are among the most prominent principles of detection. Riul et al [38,90] reported a very sensitive e-tongue based on impedance spectroscopy and ultrathin films (nanometers in thickness) deposited onto interdigitated electrodes, whose experimental setup is given in Fig. 6a.…”

Section: Information Visualization Applied To Sensing and Biosensingmentioning

confidence: 99%

Information Visualization to Enhance Sensitivity and Selectivity in Biosensing

Oliveira¹,

Pavinatto²,

Constantino³

et al. 2012

Biointerphases

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An overview is provided of the various methods for analyzing biosensing data, with emphasis on information visualization approaches such as multidimensional projection techniques. Emphasis is placed on the importance of data analysis methods, with a description of traditional techniques, including the advantages and limitations of linear and non-linear methods to generate layouts that emphasize similarity/dissimilarity relationships among data instances. Particularly important are recent methods that allow processing high-dimensional data, thus taking full advantage of the capabilities of modern equipment. In this area, now referred to as e-science, the choice of appropriate data analysis methods is crucial to enhance the sensitivity and selectivity of sensors and biosensors. Two types of systems deserving attention in this context are electronic noses and electronic tongues, which are made of sensor arrays whose electrical or electrochemical responses are combined to provide “finger print” information for aromas and tastes. Examples will also be given of unprecedented detection of tropical diseases, made possible with the use of multidimensional projection techniques. Furthermore, ways of using these techniques along with other information visualization methods to optimize biosensors will be discussed.

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Section: Information Visualization Applied To Sensing and Biosensingmentioning

confidence: 99%

Information Visualization to Enhance Sensitivity and Selectivity in Biosensing

Oliveira¹,

Pavinatto²,

Constantino³

et al. 2012

Biointerphases

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“…Os materiais tradicionais empregados com a téc-nica LB são os anfifílicos, com partes polares e apolares bem definidas, tais como os ácidos graxos, álcoois, ésteres e fosfolipídios de cadeias longas. Várias aplicações têm sido sugeridas para os filmes LB [2][3][4][5][6][7][8][9][10][11][12] , quase sempre explorando suas características de filmes ultrafinos e com controle da arquitetura molecular. Para as aplicações, todavia, geralmente são usados materiais não anfifílicos e até macromoléculas.…”

Section: Introductionunclassified

Técnicas de caracterização para investigar interações no nível molecular em filmes de Langmuir e Langmuir-Blodgett (LB)

Ferreira¹,

Caetano²,

Itri³

et al. 2005

Quím. Nova

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Recebido em 18/5/04; aceito em 27/8/04; publicado na web em 17/2/05 CHARACTERIZATION TECHNIQUES TO INVESTIGATE MOLECULAR-LEVEL INTERACTIONS IN LANGMUIR AND LANGMUIR-BLODGETT (LB)FILMS. This paper discusses fundamental concepts for the characterization of Langmuir monolayers and Langmuir-Blodgett (LB) films, with emphasis on investigations of material properties at the molecular level. By way of illustration, results for phospholipid monolayers interacting with the drug dipyridamole are highlighted. These results were obtained with several techniques, including in situ grazing incidence X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, fluorescence microscopy, in addition to surface pressure and surface potential isotherms. Also mentioned are the difficulties in producing Langmuir and LB films from macromolecules, and how molecular-level interactions in mixed polymer LB films can be exploited in sensors.Keywords: Langmuir and Langmuir-Blodgett (LB) films; characterization; air/water interface. INTRODUÇÃOFilmes nanoestruturados de materiais orgânicos são estudados extensivamente, principalmente devido ao possível controle de suas propriedades no nível molecular. Uma das técnicas empregadas para a fabricação de tais filmes é a de Langmuir-Blodgett (LB) 1 , que permite a deposição de filmes camada por camada, em que cada camada pode ter espessura de uma única molécula. Nesta técnica, um filme monomolecular, em geral, é formado sobre uma superfície de uma subfase aquosa, denominado filme de Langmuir, e depois transferido para um substrato sólido, através da imersão e retirada do substrato, verticalmente, da subfase. A repetição dos processos de imersão e retirada permite deposição de multicamadas, que podem ser altamente organizadas. Os materiais tradicionais empregados com a téc-nica LB são os anfifílicos, com partes polares e apolares bem definidas, tais como os ácidos graxos, álcoois, ésteres e fosfolipídios de cadeias longas. Várias aplicações têm sido sugeridas para os filmes LB 2-12 , quase sempre explorando suas características de filmes ultrafinos e com controle da arquitetura molecular. Para as aplicações, todavia, geralmente são usados materiais não anfifílicos e até macromoléculas. Para estes últimos, uma série de fatores novos precisa ser levada em conta, e os filmes de Langmuir geralmente não são monomoleculares.A produção de filmes LB de boa qualidade requer a obtenção de filmes de Langmuir estáveis sobre a subfase aquosa, o que nem sempre é trivial, principalmente para as macromoléculas. Portanto, a caracterização de filmes de Langmuir passa a ser um tópico com importância própria. De fato, o estudo de monocamadas ou filmes de Langmuir é um ramo interessante da físico-química, com aplicações em muitos campos da ciência e tecnologia. Devido à pequena quantidade de material no filme de Langmuir, técnicas de caracterização in situ muitas vezes são sofisticadas, como aquelas para verificar estrutura e propriedades espectroscópicas e morfológicas. Essas técnicas são utilizadas juntamente co...

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“…In this study, we report on atrazine detection with SERS using Ag colloids for concentrations between 10 −7 and 10 −12 M. For comparison purposes, we also used impedance spectroscopy with a sensor array as in typical work of electronic tongues [29,30] and cyclic voltammetry [31], in a methodology that has been applied to detect environmental pollutants. In such measurements, the sensing units were made of a bare electrode (Pt interdigitated for impedance and indium tin oxide (ITO) for cyclic voltammetry), and electrodes were coated with layer-by-layer (LbL) films containing gold or silver nanoparticles (AuNPs or AgNPs).…”

Section: Introductionmentioning

confidence: 99%

Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

et al. 2014

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The detection of trace amounts of pesticides is essential for the quality control of waters, particularly with their inevitable increasing use with the growing demand for food. In this study, we report on the detection of atrazine, a highly toxic herbicide, down to 5×10−12 M, which is sufficient to monitor the quality of drinking water even according to the most stringent international regulations. Such detection was performed with surface-enhanced Raman scattering (SERS) in atrazine incorporated into silver nanoparticles (AgNPs) colloids, with the SERS spectra being treated with Sammon's mapping, an information visualization technique. In addition to providing a fingerprint of the atrazine molecules, SERS is advantageous in comparison with impedance spectroscopy and cyclic voltammetry applied to a sensor array of units made with layer-by-layer (LbL) films containing AgNPs and AuNPs. The combined use of SERS and information visualization methods is promising for monitoring water quality with regard to other pesticides, which may even approach single molecule detection.

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Artificial Taste Sensor: Efficient Combination of Sensors Made from Langmuir−Blodgett Films of Conducting Polymers and a Ruthenium Complex and Self-Assembled Films of an Azobenzene-Containing Polymer

Cited by 179 publications

References 24 publications

Information Visualization to Enhance Sensitivity and Selectivity in Biosensing

Information Visualization to Enhance Sensitivity and Selectivity in Biosensing

Técnicas de caracterização para investigar interações no nível molecular em filmes de Langmuir e Langmuir-Blodgett (LB)

Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

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