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Nerath G, Oliveira DA, Siqueira JR, Caseli L. Using Carbon Nanotubes to Improve Enzyme Activity and Electroactivity of Fatty Acid Langmuir-Blodgett Film-Incorporated Galactose Oxidase for Sensing and Energy Storage Applications. ACS Appl Mater Interfaces 2024. [PMID: 38334123 DOI: 10.1021/acsami.3c18824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Incorporating enzymes into nanostructured supercapacitor devices represents a groundbreaking advancement in energy storage. Enzyme catalysis using nanomaterials enhances performance, efficiency, and stability by facilitating precise charge transfer, while the nanostructure provides a high surface area and improved conductivity. This synergy yields eco-friendly, high-performance energy storage solutions crucial for diverse applications, from portable electronics to renewable energy systems. In this study, we harnessed the versatility of Langmuir-Blodgett films to create meticulously organized thin films with specific enzyme properties, coupled with carbon nanotubes, to develop biosupercapacitors. Langmuir monolayers were constructed with stearic acid, carbon nanotubes, and galactose oxidase. Following comprehensive characterization using tensiometric, rheological, morphological, and spectroscopic techniques, the monolayers were transferred to solid supports, yielding Langmuir-Blodgett films. These films exhibited superior performance, with persisting enzyme activity. However, increasing film thickness did not enhance enzymatic activity values, indicating a surface-driven process. Subsequently, we explored the electrochemical properties of the films, revealing stability compatible with supercapacitor applications. The introduction of carbon nanotubes demonstrated a higher capacitance, indicating the potential viability of the films for energy storage applications.
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Affiliation(s)
- Gabriel Nerath
- Laboratory of Hybrid Materials (LMH), Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), Diadema 09913-030, São Paulo, Brazil
| | - Danilo A Oliveira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, Minas Gerais, Brazil
| | - José R Siqueira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, Minas Gerais, Brazil
| | - Luciano Caseli
- Laboratory of Hybrid Materials (LMH), Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), Diadema 09913-030, São Paulo, Brazil
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Scholl FA, Oliveira DA, Siqueira JR, Caseli L. Exploring Langmuir-Blodgett Films with Phospholipid-Graphene Oxide/MnO2 as a Hybrid Nanostructured Interface for Supercapacitor Applications. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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Scholl FA, Siqueira JR, Caseli L. Graphene Oxide Modulating the Bioelectronic Properties of Penicillinase Immobilized in Lipid Langmuir-Blodgett Films. Langmuir 2022; 38:2372-2378. [PMID: 35143210 DOI: 10.1021/acs.langmuir.1c03410] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this paper, graphene oxide was incorporated in penicillinase-lipid Langmuir monolayers and transferred to solid supports as Langmuir-Blodgett (LB) films so that the enzyme catalytic properties could be evaluated. Adsorption of penicillinase and graphene oxide on dimyristoylphosphatidic acid (DMPA) monolayers at the air-water interface was investigated by tensiometry, vibrational spectroscopy, and Brewster angle microscopy. The LB films were characterized by quartz crystal microbalance, infrared spectroscopy, luminescence spectroscopy, and atomic force microscopy. Enzyme activity was studied with UV-vis spectroscopy, and the feasibility of the supramolecular device nanostructured as ultrathin films was essayed as an optical sensor device. The presence of graphene oxide in the enzyme-lipid LB film not only tuned the catalytic activity of penicillinase but also helped conserve its enzyme activity after weeks. These results may be related not only to the molecular architecture provided by the film but also to the synergism between the compounds on the active layer, leading to a molecular architecture that allowed a fast analyte diffusion owing to a suitable molecular accommodation which also preserved the penicillinase activity. This work then demonstrates the feasibility of employing LB films composed of lipids, graphene oxide, and enzymes as optical devices for biosensing applications as a proof-of-concept experiment.
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Affiliation(s)
- Fábio A Scholl
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), 09913-030 Diadema, São Paulo, Brazil
| | - José R Siqueira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), 38064-200 Uberaba, Minas Gerais, Brazil
| | - Luciano Caseli
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), 09913-030 Diadema, São Paulo, Brazil
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Rodrigues RT, Siqueira JR, Caseli L. Structural and viscoelastic properties of floating monolayers of a pectinolytic enzyme and their influence on the catalytic properties. J Colloid Interface Sci 2021; 589:568-577. [PMID: 33497895 DOI: 10.1016/j.jcis.2021.01.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 12/28/2020] [Accepted: 01/10/2021] [Indexed: 11/18/2022]
Abstract
HYPOTHESIS The catalytic activity of enzymes immobilized in self-assembly systems as Langmuir-Blodgett (LB) films is influenced by molecular interactions dictated by the composition and viscoelasticity of the previous floating monolayers. We believe that the insertion of carbon nanotubes (CNT) in mixed polygalacturonase/lipid monolayers may influence intermolecular interactions and viscoelastic properties, being then possible to tune system stability and rheological properties, driving catalytic properties of the films for biosensing. EXPERIMENTS The physicochemical properties of the monolayers were investigated by tensiometry, surface potential, Brewster angle microscopy, infrared spectroscopy, and dilatational rheology. The monolayers were transferred to solid supports LB films and characterized by atomic force microscopy, quartz crystal microbalance, and fluorescence spectroscopy. The catalytic activity of the LB films was verified by colorimetric assay. FINDINGS The enzyme-CNT-lipid film had a catalytic activity at least twice as high as the pure enzyme owing to the synergy between the components, with the lipid acting as a protector matrix for the enzyme and the CNTs acting as an energy transfer facilitator. These results point to a proof-of-concept system, through which we can propose an alternative to achieve enhanced bio-inspired films with high control of the molecular architecture by using the LB approach.
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Affiliation(s)
- Raul T Rodrigues
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), 09913-030 Diadema, SP, Brazil
| | - José R Siqueira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), 38064-200 Uberaba, MG, Brazil.
| | - Luciano Caseli
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), 09913-030 Diadema, SP, Brazil.
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Rodrigues RT, Morais PV, Nordi CSF, Schöning MJ, Siqueira JR, Caseli L. Carbon Nanotubes and Algal Polysaccharides To Enhance the Enzymatic Properties of Urease in Lipid Langmuir-Blodgett Films. Langmuir 2018; 34:3082-3093. [PMID: 29397738 DOI: 10.1021/acs.langmuir.7b04317] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Algal polysaccharides (extracellular polysaccharides) and carbon nanotubes (CNTs) were adsorbed on dioctadecyldimethylammonium bromide Langmuir monolayers to serve as a matrix for the incorporation of urease. The physicochemical properties of the supramolecular system as a monolayer at the air-water interface were investigated by surface pressure-area isotherms, surface potential-area isotherms, interfacial shear rheology, vibrational spectroscopy, and Brewster angle microscopy. The floating monolayers were transferred to hydrophilic solid supports, quartz, mica, or capacitive electrolyte-insulator-semiconductor (EIS) devices, through the Langmuir-Blodgett (LB) technique, forming mixed films, which were investigated by quartz crystal microbalance, fluorescence spectroscopy, and field emission gun scanning electron microscopy. The enzyme activity was studied with UV-vis spectroscopy, and the feasibility of the thin film as a urea sensor was essayed in an EIS sensor device. The presence of CNT in the enzyme-lipid LB film not only tuned the catalytic activity of urease but also helped to conserve its enzyme activity. Viability as a urease sensor was demonstrated with capacitance-voltage and constant capacitance measurements, exhibiting regular and distinctive output signals over all concentrations used in this work. These results are related to the synergism between the compounds on the active layer, leading to a surface morphology that allowed fast analyte diffusion owing to an adequate molecular accommodation, which also preserved the urease activity. This work demonstrates the feasibility of employing LB films composed of lipids, CNT, algal polysaccharides, and enzymes as EIS devices for biosensing applications.
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Affiliation(s)
- Raul T Rodrigues
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
| | - Paulo V Morais
- Institute of Exact Sciences, Natural and Education , Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba , Minas Gerais , Brazil
- Interdisciplinary Laboratory of Electrochemistry and Ceramics, Chemistry Institute , São Paulo State University , 14800-900 Araraquara , São Paulo , Brazil
| | - Cristina S F Nordi
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
| | - Michael J Schöning
- Institute of Nano- and Biotechnologies (INB) , FH Aachen, Campus Jülich , 52428 Jülich , Germany
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , 52425 Jülich , Germany
| | - José R Siqueira
- Institute of Exact Sciences, Natural and Education , Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba , Minas Gerais , Brazil
| | - Luciano Caseli
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
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Scholl FA, Morais PV, Gabriel RC, Schöning MJ, Siqueira JR, Caseli L. Carbon Nanotubes Arranged As Smart Interfaces in Lipid Langmuir-Blodgett Films Enhancing the Enzymatic Properties of Penicillinase for Biosensing Applications. ACS Appl Mater Interfaces 2017; 9:31054-31066. [PMID: 28816431 DOI: 10.1021/acsami.7b08095] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this paper, carbon nanotubes (CNTs) were incorporated in penicillinase-phospholipid Langmuir and Langmuir-Blodgett (LB) films to enhance the enzyme catalytic properties. Adsorption of the penicillinase and CNTs at dimyristoylphosphatidic acid (DMPA) monolayers at the air-water interface was investigated by surface pressure-area isotherms, vibrational spectroscopy, and Brewster angle microscopy. The floating monolayers were transferred to solid supports through the LB technique, forming mixed DMPA-CNTs-PEN films, which were investigated by quartz crystal microbalance, vibrational spectroscopy, and atomic force microscopy. Enzyme activity was studied with UV-vis spectroscopy and the feasibility of the supramolecular device nanostructured as ultrathin films were essayed in a capacitive electrolyte-insulator-semiconductor (EIS) sensor device. The presence of CNTs in the enzyme-lipid LB film not only tuned the catalytic activity of penicillinase but also helped conserve its enzyme activity after weeks, showing increased values of activity. Viability as penicillin sensor was demonstrated with capacitance/voltage and constant capacitance measurements, exhibiting regular and distinctive output signals over all concentrations used in this work. These results may be related not only to the nanostructured system provided by the film, but also to the synergism between the compounds on the active layer, leading to a surface morphology that allowed a fast analyte diffusion because of an adequate molecular accommodation, which also preserved the penicillinase activity. This work therefore demonstrates the feasibility of employing LB films composed of lipids, CNTs, and enzymes as EIS devices for biosensing applications.
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Affiliation(s)
- Fabio A Scholl
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP) , 09913-030 Diadema, São Paulo, Brazil
| | - Paulo V Morais
- Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba, Minas Gerais, Brazil
| | - Rayla C Gabriel
- Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba, Minas Gerais, Brazil
| | - Michael J Schöning
- Institute of Nano- and Biotechnologies (INB) , FH Aachen, Campus Jülich, 52428 Jülich, Germany
- Peter Grünberg Institute (PGI-8) , Forschungszentrum Jülich, 52425 Jülich, Germany
| | - José R Siqueira
- Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba, Minas Gerais, Brazil
| | - Luciano Caseli
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP) , 09913-030 Diadema, São Paulo, Brazil
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Goto TE, Lopes CC, Nader HB, Silva AC, Dantas NO, Siqueira JR, Caseli L. CdSe magic-sized quantum dots incorporated in biomembrane models at the air–water interface composed of components of tumorigenic and non-tumorigenic cells. Biochimica et Biophysica Acta (BBA) - Biomembranes 2016; 1858:1533-40. [DOI: 10.1016/j.bbamem.2016.04.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 04/08/2016] [Accepted: 04/19/2016] [Indexed: 10/21/2022]
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Oliveira ON, Iost RM, Siqueira JR, Crespilho FN, Caseli L. Nanomaterials for diagnosis: challenges and applications in smart devices based on molecular recognition. ACS Appl Mater Interfaces 2014; 6:14745-66. [PMID: 24968359 DOI: 10.1021/am5015056] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Clinical diagnosis has always been dependent on the efficient immobilization of biomolecules in solid matrices with preserved activity, but significant developments have taken place in recent years with the increasing control of molecular architecture in organized films. Of particular importance is the synergy achieved with distinct materials such as nanoparticles, antibodies, enzymes, and other nanostructures, forming structures organized on the nanoscale. In this review, emphasis will be placed on nanomaterials for biosensing based on molecular recognition, where the recognition element may be an enzyme, DNA, RNA, catalytic antibody, aptamer, and labeled biomolecule. All of these elements may be assembled in nanostructured films, whose layer-by-layer nature is essential for combining different properties in the same device. Sensing can be done with a number of optical, electrical, and electrochemical methods, which may also rely on nanostructures for enhanced performance, as is the case of reporting nanoparticles in bioelectronics devices. The successful design of such devices requires investigation of interface properties of functionalized surfaces, for which a variety of experimental and theoretical methods have been used. Because diagnosis involves the acquisition of large amounts of data, statistical and computational methods are now in widespread use, and one may envisage an integrated expert system where information from different sources may be mined to generate the diagnostics.
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Affiliation(s)
- Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo , CP 369, 13560-970 São Carlos, São Paulo, Brazil
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Siqueira JR, Molinnus D, Beging S, Schöning MJ. Incorporating a Hybrid Urease-Carbon Nanotubes Sensitive Nanofilm on Capacitive Field-Effect Sensors for Urea Detection. Anal Chem 2014; 86:5370-5. [DOI: 10.1021/ac500458s] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- José R. Siqueira
- Institute
of Exact Sciences, Naturals and Education, Federal University of Triângulo Mineiro (UFTM), 38064-200 Uberaba, Brazil
| | - Denise Molinnus
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
| | - Stefan Beging
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
| | - Michael J. Schöning
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
- Peter
Grünberg Institute (PGI-8), Forschungszentrum Jülich, 52425 Jülich, Germany
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Gasparotto LHS, Castelhano ALB, Silva ACA, Dantas NO, Oliveira ON, Siqueira JR. Dendrimer–carbon nanotube layer-by-layer film as an efficient host matrix for electrogeneration of PtCo electrocatalysts. Phys Chem Chem Phys 2014; 16:2384-9. [DOI: 10.1039/c3cp54296c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gasparotto LHS, Castelhano ALB, Gabriel RC, Dantas NO, Oliveira ON, Siqueira JR. Electrogeneration of platinum nanoparticles in a matrix of dendrimer–carbon nanotubes. Phys Chem Chem Phys 2013; 15:17887-92. [DOI: 10.1039/c3cp52707g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Caseli L, Tiburcio VLB, Vargas FFR, Marangoni S, Siqueira JR. Enhanced Architecture of Lipid-Carbon Nanotubes as Langmuir–Blodgett Films to Investigate the Enzyme Activity of Phospholipases from Snake Venom. J Phys Chem B 2012; 116:13424-9. [DOI: 10.1021/jp307585k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luciano Caseli
- Federal University of São Paulo (UNIFESP), Diadema, São Paulo
(SP), 09972-27, Brazil
| | - Vera L. B. Tiburcio
- Federal University of the Triângulo Mineiro (UFTM), Uberaba, Minas
Gerais (MG), 38025-180, Brazil
| | - Frey F. R. Vargas
- State University of Campinas (UNICAMP), Campinas, São Paulo (SP),
13083-970, Brazil
| | - Sérgio Marangoni
- State University of Campinas (UNICAMP), Campinas, São Paulo (SP),
13083-970, Brazil
| | - José R. Siqueira
- Federal University of the Triângulo Mineiro (UFTM), Uberaba, Minas
Gerais (MG), 38025-180, Brazil
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Siqueira JR, Gabriel RC, Zucolotto V, Silva ACA, Dantas NO, Gasparotto LHS. Electrodeposition of catalytic and magnetic gold nanoparticles on dendrimer–carbon nanotube layer-by-layer films. Phys Chem Chem Phys 2012; 14:14340-3. [DOI: 10.1039/c2cp42813j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Siqueira JR, Caseli L, Crespilho FN, Zucolotto V, Oliveira ON. Immobilization of biomolecules on nanostructured films for biosensing. Biosens Bioelectron 2010; 25:1254-63. [DOI: 10.1016/j.bios.2009.09.043] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 09/14/2009] [Accepted: 09/30/2009] [Indexed: 01/18/2023]
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Siqueira JR, Maki RM, Paulovich FV, Werner CF, Poghossian A, de Oliveira MCF, Zucolotto V, Oliveira ON, Schöning MJ. Use of Information Visualization Methods Eliminating Cross Talk in Multiple Sensing Units Investigated for a Light-Addressable Potentiometric Sensor. Anal Chem 2009; 82:61-5. [DOI: 10.1021/ac9024076] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José R. Siqueira
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Rafael M. Maki
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Fernando V. Paulovich
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Carl F. Werner
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Arshak Poghossian
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Maria C. F. de Oliveira
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Valtencir Zucolotto
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Osvaldo N. Oliveira
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
| | - Michael J. Schöning
- Instituto de Física de São Carlos and Instituto de Ciências Matemáticas e de Computação, University of São Paulo, 369 São Carlos, Brazil, Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, 52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN-2), Research Centre Jülich, 52425 Jülich, Germany
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Siqueira JR, Abouzar MH, Poghossian A, Zucolotto V, Oliveira ON, Schöning MJ. Penicillin biosensor based on a capacitive field-effect structure functionalized with a dendrimer/carbon nanotube multilayer. Biosens Bioelectron 2009; 25:497-501. [DOI: 10.1016/j.bios.2009.07.007] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 06/23/2009] [Accepted: 07/13/2009] [Indexed: 10/20/2022]
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Siqueira JR, Gasparotto LHS, Crespilho FN, Carvalho AJF, Zucolotto V, Oliveira ON. Physicochemical Properties and Sensing Ability of Metallophthalocyanines/Chitosan Nanocomposites. J Phys Chem B 2006; 110:22690-4. [PMID: 17092017 DOI: 10.1021/jp0649089] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electroactive nanostructured films of chitosan (Ch) and tetrasulfonated metallophthalocyanines containing nickel (NiTsPc), copper (CuTsPc), and iron (FeTsPc) were produced via the electrostatic layer-by-layer (LbL) technique. The multilayer formation was monitored with UV-vis spectroscopy by measuring the increase of the Q-band absorption from metallophthalocyanines. Results from transmission and reflection infrared spectroscopy suggested specific interactions between SO(3)(-) groups from metallophthalocyanines and NH(3)(+) from chitosan. The electroactive multilayered films assembled onto an ITO electrode were characterized by cyclic voltammetry, with Ch/NiTsPc films showing higher stability and well-defined voltammograms displaying reversible redox peaks at 0.80 and 0.75 V. These films could be used to detect dopamine (DA) in the concentration range from 5.0 x 10(-6) to 1.5 x 10(-4) mol L(-1). Also, ITO-(Ch/NiTsPc)(n)() electrodes showed higher electrocatalytic activity for DA oxidation when compared with a bare ITO electrode. On the other hand, only the Ch/FeTsPc and Ch/CuTsPc modified electrodes could distinguish between DA and ascorbic acid. These results demonstrate that versatile electrodes can be prepared by incorporation of different metallophthalocyanine molecules in LbL films, which may be used in bioanalytical applications.
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Affiliation(s)
- José R Siqueira
- Universidade de São Paulo, IFSC, CP 369, São Carlos, SP, 13560-970, Brazil
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Crespilho FN, Zucolotto V, Siqueira JR, Constantino CJL, Nart FC, Oliveira ON. Immobilization of humic acid in nanostructured layer-by-layer films for sensing applications. Environ Sci Technol 2005; 39:5385-9. [PMID: 16082970 DOI: 10.1021/es050552n] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Humic acids (HAs), naturally occurring biomacromolecules, were incorporated into nanostructured polymeric films using the layer-by-layer (LbL) technique, in which HA layers were alternated with layers of poly(allylamine hydrochloride) (PAH). Atomic force microscopy (AFM) revealed very smooth films, with mean roughness varying from 0.89 to 1.19 nm for films containing 5 and 15 PAH/HA bilayers, respectively. The films displayed electroactivity, with the presence of only one reduction peak at ca. 0.675 V (vs Ag/AgCl). Such a well-defined electroactivity allowed the films to be used as highly sensitive pesticide sensors, with detection of pentachlorophenol (PCP) in solutions at concentrations as low as 10(-9) mol L(-1).
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Affiliation(s)
- Frank N Crespilho
- IQSC, Universidade de São Paulo, CP, 13560-970, São Carlos, SP, Brazil
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