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Liu H, Tian X, Liu H, Wang X. Electrochemical biosensor based on tyrosinase-immobilized phase-change microcapsules for ultrasensitive detection of phenolic contaminants under in situ thermal management. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.12.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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2
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Advanced Optical Sensing of Phenolic Compounds for Environmental Applications. SENSORS 2021; 21:s21227563. [PMID: 34833640 PMCID: PMC8619556 DOI: 10.3390/s21227563] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/09/2021] [Accepted: 11/09/2021] [Indexed: 01/28/2023]
Abstract
Phenolic compounds are particularly dangerous due to their ability to remain in the environment for a long period of time and their toxic effects. They enter in the environment in different ways, such as waste from paper manufacturing, agriculture (pesticides, insecticides, herbicides), pharmaceuticals, the petrochemical industry, and coal processing. Conventional methods for phenolic compounds detection present some disadvantages, such as cumbersome sample preparation, complex and time-consuming procedures, and need of expensive equipment. Therefore, there is a very large interest in developing sensors and new sensing schemes for fast and easy-to-use methods for detecting and monitoring the phenolic compound concentration in the environment, with special attention to water. Good analytical properties, reliability, and adaptability are required for the developed sensors. The present paper aims at revising the most generally used optical methods for designing and fabricating biosensors and sensors for phenolic compounds. Some selected examples of the most interesting applications of these techniques are also proposed.
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3
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Polyelectrolyte Multilayers: An Overview on Fabrication, Properties, and Biomedical and Environmental Applications. MATERIALS 2021; 14:ma14154152. [PMID: 34361346 PMCID: PMC8348132 DOI: 10.3390/ma14154152] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 07/22/2021] [Accepted: 07/23/2021] [Indexed: 12/11/2022]
Abstract
Polyelectrolyte multilayers are versatile materials that are used in a large number of domains, including biomedical and environmental applications. The fabrication of polyelectrolyte multilayers using the layer-by-layer technique is one of the simplest methods to obtain composite functional materials. The properties of the final material can be easily tuned by changing the deposition conditions and the used building blocks. This review presents the main characteristics of polyelectrolyte multilayers, the fabrication methods currently used, and the factors influencing the layer-by-layer assembly of polyelectrolytes. The last section of this paper presents some of the most important applications of polyelectrolyte multilayers, with a special focus on biomedical and environmental applications.
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Agaricus bisporus Crude Extract: Characterization and Analytical Application. Molecules 2020; 25:molecules25245996. [PMID: 33352884 PMCID: PMC7765987 DOI: 10.3390/molecules25245996] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/08/2020] [Accepted: 12/16/2020] [Indexed: 12/19/2022] Open
Abstract
In the present work crude Agaricus bisporus extract (ABE) has been prepared and characterized by its tyrosinase activity, protein composition and substrate specificity. The presence of mushroom tyrosinase (PPO3) in ABE has been confirmed using two-dimensional electrophoresis, followed by MALDI TOF/TOF MS-based analysis. GH27 alpha-glucosidases, GH47 alpha-mannosidases, GH20 hexosaminidases, and alkaline phosphatases have been also detected in ABE. ABE substrate specificity has been studied using 19 phenolic compounds: polyphenols (catechol, gallic, caffeic, chlorogenic, and ferulic acids, quercetin, rutin, dihydroquercetin, l-dihydroxyphenylalanine, resorcinol, propyl gallate) and monophenols (l-tyrosine, phenol, p-nitrophenol, o-nitrophenol, guaiacol, o-cresol, m-cresol, p-cresol). The comparison of ABE substrate specificity and affinity to the corresponding parameters of purified A. bisporus tyrosinase has revealed no major differences. The conditions for spectrophotometric determination have been chosen and the analytical procedures for determination of 1.4 × 10-4-1.0 × 10-3 M l-tyrosine, 3.1 × 10-6-1.0 × 10-4 M phenol, 5.4 × 10-5-1.0 × 10-3 M catechol, 8.5 × 10-5-1.0 × 10-3 M caffeic acid, 1.5 × 10-4-7.5 × 10-4 M chlorogenic acid, 6.8 × 10-5-1.0 × 10-3 M l-DOPA have been proposed. The procedures have been applied for the determination of l-tyrosine in food supplements, l-DOPA in synthetic serum, and phenol in waste water from the food manufacturing plant. Thus, we have demonstrated the possibility of using ABE as a substitute for tyrosinase in such analytical applications, as food supplements, medical and environmental analysis.
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do Nascimento Marreiro Teixeira ASS, Teixeira PRS, de Oliveira Farias EA, Ferraz e Sousa B, Moura Sérvulo KBDL, da Silva DA, Eiras C. Babassu mesocarp (Orbignya phalerata Mart) nanoparticle-based biosensors for indirect sulfite detection in industrial juices. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04546-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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6
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Cano‐Raya C, Dencheva NV, Braz JF, Malfois M, Denchev ZZ. Optical biosensor for catechol determination based on laccase‐immobilized anionic polyamide 6 microparticles. J Appl Polym Sci 2020. [DOI: 10.1002/app.49131] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Clara Cano‐Raya
- Department of Polymer Engineering, IPC – Institute for Polymers and CompositesUniversity of Minho Guimarães Portugal
| | - Nadya V. Dencheva
- Department of Polymer Engineering, IPC – Institute for Polymers and CompositesUniversity of Minho Guimarães Portugal
| | - Joana F. Braz
- Department of Polymer Engineering, IPC – Institute for Polymers and CompositesUniversity of Minho Guimarães Portugal
| | - Marc Malfois
- ALBA Synchrotron Facility, Cerdanyola del Vallès Barcelona Spain
| | - Zlatan Z. Denchev
- Department of Polymer Engineering, IPC – Institute for Polymers and CompositesUniversity of Minho Guimarães Portugal
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7
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Polatoğlu İ, Karataş D. Modeling of molecular interaction between catechol and tyrosinase by DFT. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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8
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Ge L, Li SP, Lisak G. Advanced sensing technologies of phenolic compounds for pharmaceutical and biomedical analysis. J Pharm Biomed Anal 2020; 179:112913. [DOI: 10.1016/j.jpba.2019.112913] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/10/2019] [Accepted: 10/05/2019] [Indexed: 11/17/2022]
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9
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Rubira RJG, Camacho SA, Martin CS, Mejía-Salazar JR, Reyes Gómez F, da Silva RR, de Oliveira Junior ON, Alessio P, Constantino CJL. Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS). SENSORS (BASEL, SWITZERLAND) 2019; 20:E15. [PMID: 31861443 PMCID: PMC6982777 DOI: 10.3390/s20010015] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 12/06/2019] [Accepted: 12/10/2019] [Indexed: 01/05/2023]
Abstract
Detection of the drug Levodopa (3,4-dihydroxyphenylalanine, L-Dopa) is essential for the medical treatment of several neural disorders, including Parkinson's disease. In this paper, we employed surface-enhanced Raman scattering (SERS) with three shapes of silver nanoparticles (nanostars, AgNS; nanospheres, AgNP; and nanoplates, AgNPL) to detect L-Dopa in the nanoparticle dispersions. The sensitivity of the L-Dopa SERS signal depended on both nanoparticle shape and L-Dopa concentration. The adsorption mechanisms of L-Dopa on the nanoparticles inferred from a detailed analysis of the Raman spectra allowed us to determine the chemical groups involved. For instance, at concentrations below/equivalent to the limit found in human plasma (between 10-7-10-8 mol/L), L-Dopa adsorbs on AgNP through its ring, while at 10-5-10-6 mol/L adsorption is driven by the amino group. At even higher concentrations, above 10-4 mol/L, L-Dopa polymerization predominates. Therefore, our results show that adsorption depends on both the type of Ag nanoparticles (shape and chemical groups surrounding the Ag surface) and the L-Dopa concentration. The overall strategy based on SERS is a step forward to the design of nanostructures to detect analytes of clinical interest with high specificity and at varied concentration ranges.
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Affiliation(s)
- Rafael Jesus Gonçalves Rubira
- School of Technology and Applied Sciences, São Paulo State University (UNESP), Presidente Prudente 19060-900 SP, Brazil; (C.S.M.); (P.A.); (C.J.L.C.)
| | - Sabrina Alessio Camacho
- School of Sciences, Humanities and Languages, São Paulo State University (UNESP), Assis 19806-900 SP, Brazil;
| | - Cibely Silva Martin
- School of Technology and Applied Sciences, São Paulo State University (UNESP), Presidente Prudente 19060-900 SP, Brazil; (C.S.M.); (P.A.); (C.J.L.C.)
| | | | - Faustino Reyes Gómez
- São Carlos Institute of Physics, University of São Paulo (USP), P.O. Box 369, São Carlos 13560-970 SP, Brazil; (F.R.G.); (R.R.d.S.)
| | - Robson Rosa da Silva
- São Carlos Institute of Physics, University of São Paulo (USP), P.O. Box 369, São Carlos 13560-970 SP, Brazil; (F.R.G.); (R.R.d.S.)
| | | | - Priscila Alessio
- School of Technology and Applied Sciences, São Paulo State University (UNESP), Presidente Prudente 19060-900 SP, Brazil; (C.S.M.); (P.A.); (C.J.L.C.)
| | - Carlos José Leopoldo Constantino
- School of Technology and Applied Sciences, São Paulo State University (UNESP), Presidente Prudente 19060-900 SP, Brazil; (C.S.M.); (P.A.); (C.J.L.C.)
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Morosanova M, Bashkatova A, Morosanova E. Spectrophotometric and Smartphone-Assisted Determination of Phenolic Compounds Using Crude Eggplant Extract. Molecules 2019; 24:E4407. [PMID: 31810325 PMCID: PMC6930448 DOI: 10.3390/molecules24234407] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/26/2019] [Accepted: 11/29/2019] [Indexed: 01/18/2023] Open
Abstract
In order to develop a simple, reliable and low cost enzymatic method for the determination of phenolic compounds we studied polyphenol oxidase activity of crude eggplant (S. melongena) extract using 13 phenolic compounds. Catechol, caffeic and chlorogenic acids, and L-DOPA have been rapidly oxidized with the formation of colored products. Monophenolic compounds have been oxidized at a much slower speed. Ferulic acid, quercetin, rutin, and dihydroquercetin have been found to inhibit polyphenol oxidase activity of crude eggplant extract. The influence of pH, temperature, crude eggplant extract amount, and 3-methyl-2-benzothiazolinone hydrazone (MBTH) concentration on the oxidation of catechol, caffeic acid, chlorogenic acid, and L-DOPA has been investigated spectrophotometrically. Michaelis constants values decrease by a factor of 2 to 3 in the presence of MBTH. Spectrophotometric (cuvette and microplate variants) and smartphone-assisted procedures for phenolic compounds determination have been proposed. Average saturation values (HSV color model) of the images of the microplate wells have been chosen as the analytical signal for smartphone-assisted procedure. LOD values for catechol, caffeic acid, chlorogenic acid, and L-DOPA equaled 5.1, 6.3, 5.8 and 30.0 µM (cuvette procedure), 12.2, 13.2, 13.2 and 80.4 µM (microplate procedure), and 23.5, 26.4, 20.8 and 120.6 µM (smartphone procedure). All the variants have been successfully applied for fast (4-5 min) and simple TPC determination in plant derived products and L-DOPA determination in model biological fluids. The values found with smartphone procedure are in good agreement with both spectrophotometric procedures values and reference values. Using crude eggplant extract- mediated reactions combined with smartphone camera detection has allowed creating low-cost, reliable and environmentally friendly analytical method for the determination of phenolic compounds.
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Affiliation(s)
| | | | - E.I. Morosanova
- Analytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, 119234 Moscow, Russia
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11
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Tyrosinase based amperometric biosensor for determination of tyramine in fermented food and beverages with gold nanoparticle doped poly(8-anilino-1-naphthalene sulphonic acid) modified electrode. Food Chem 2019; 282:18-26. [PMID: 30711102 DOI: 10.1016/j.foodchem.2018.12.104] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 11/07/2018] [Accepted: 12/22/2018] [Indexed: 01/05/2023]
Abstract
The aim of the present work was to develop an amperometric biosensor for tyramine (Tyr) measurement in food and beverages. The biosensor architecture is based on tyrosinase (Tyrase) immobilization on glassy carbon electrode modified by a nanocomposite consisting of gold nanoparticles (AuNP) synthesized by a green method and poly(8-anilino-1-naphthalene sulphonic acid) modified glassy carbon electrode. Under optimized experimental conditions for fixed potential amperometric detection, the biosensor exhibited a linear response to tyramine in the range 10-120 µM and the limit of detection was estimated to be 0.71 µM. The novel platform showed good selectivity, long-term stability, and reproducibility. The strong interaction between tyrosinase and the nanocomposite was revealed by the high value of the Michaelis-Menten constant (79.3 μM). The fabricated biosensor was successfully applied to the determination of Tyr in dairy products and fermented drinks with good recoveries, which makes it a promising biosensor for quantification of tyramine.
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12
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Optical method for detecting oxygen via the chromogenic reaction catalyzed by polyphenol oxidase. Enzyme Microb Technol 2018; 114:1-6. [DOI: 10.1016/j.enzmictec.2018.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 02/24/2018] [Accepted: 02/26/2018] [Indexed: 02/03/2023]
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13
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Capecchi E, Piccinino D, Delfino I, Bollella P, Antiochia R, Saladino R. Functionalized Tyrosinase-Lignin Nanoparticles as Sustainable Catalysts for the Oxidation of Phenols. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E438. [PMID: 29914085 PMCID: PMC6027214 DOI: 10.3390/nano8060438] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 06/12/2018] [Accepted: 06/14/2018] [Indexed: 02/07/2023]
Abstract
Sustainable catalysts for the oxidation of phenol derivatives under environmentally friendly conditions were prepared by the functionalization of lignin nanoparticles with tyrosinase. Lignin, the most abundant polyphenol in nature, is the main byproduct in the pulp and paper manufacturing industry and biorefinery. Tyrosinase has been immobilized by direct adsorption, encapsulation, and layer-by-layer deposition, with or without glutaraldehyde reticulation. Lignin nanoparticles were found to be stable to the tyrosinase activity. After the enzyme immobilization, they showed a moderate to high catalytic effect in the synthesis of catechol derivatives, with the efficacy of the catalyst being dependent on the specific immobilization procedures.
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Affiliation(s)
- Eliana Capecchi
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Davide Piccinino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Ines Delfino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Paolo Bollella
- Department of Chemistry and Drug Technologies, Sapienza University of Rome P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Riccarda Antiochia
- Department of Chemistry and Drug Technologies, Sapienza University of Rome P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Raffaele Saladino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
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Agarwal P, Dubey S, Singh M, Singh RP. Aspergillus niger PA2 Tyrosinase Covalently Immobilized on a Novel Eco-Friendly Bio-Composite of Chitosan-Gelatin and Its Evaluation for L-DOPA Production. Front Microbiol 2017; 7:2088. [PMID: 28066399 PMCID: PMC5177867 DOI: 10.3389/fmicb.2016.02088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 12/09/2016] [Indexed: 11/30/2022] Open
Abstract
Tyrosinase (EC 1.14.18.1) a copper-containing monooxygenase, isolated from a fungal isolate Aspergillus niger PA2 was subjected for immobilization onto a composite consisting of chitosan and gelatin biopolymers. The homogeneity of the chitosan-gelatin biocomposite film was characterized by X-ray diffraction analyses. To evaluate immobilization efficiency, chitosan-gelatin-Tyr bio-composite films were analyzed by field emission scanning electron microscopy, atomic force microscopy and UV-spectroscopy. The rough morphology of the film led to a high loading of enzyme and it could retain its bioactivity for a longer period. The enzyme adsorbed onto the film exhibited 72% of its activity after 10 days and exhibited good repeatability for up to nine times, after intermittent storage. Moreover, the immobilized enzyme exhibited broader pH and temperature profile as compared to free counterpart. Immobilized enzyme was further evaluated for the synthesis of L-DOPA (2,4-dihydroxy phenylalanine) which is a precursor of dopamine and a potent drug for the treatment of Parkinson's disease and for myocardium neurogenic injury.
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Affiliation(s)
- Pragati Agarwal
- Department of Biotechnology, Indian Institute of Technology Roorkee Roorkee, India
| | - Swati Dubey
- Department of Biotechnology, Indian Institute of Technology Roorkee Roorkee, India
| | - Mukta Singh
- Department of Biotechnology, Indian Institute of Technology Roorkee Roorkee, India
| | - Rajesh P Singh
- Department of Biotechnology, Indian Institute of Technology Roorkee Roorkee, India
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15
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Kremer T, Kovačević D, Salopek J, Požar J. Conditions Leading to Polyelectrolyte Complex Overcharging in Solution: Complexation of Poly(acrylate) Anion with Poly(allylammonium) Cation. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01892] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Tomislav Kremer
- Division of Physical Chemistry,
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Davor Kovačević
- Division of Physical Chemistry,
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Jasmina Salopek
- Division of Physical Chemistry,
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Josip Požar
- Division of Physical Chemistry,
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
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16
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Campanhã Vicentini F, Garcia LLC, Figueiredo-Filho LCS, Janegitz BC, Fatibello-Filho O. A biosensor based on gold nanoparticles, dihexadecylphosphate, and tyrosinase for the determination of catechol in natural water. Enzyme Microb Technol 2015; 84:17-23. [PMID: 26827770 DOI: 10.1016/j.enzmictec.2015.12.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 12/03/2015] [Accepted: 12/09/2015] [Indexed: 10/22/2022]
Abstract
In this work, a biosensor using a glassy carbon electrode modified with gold nanoparticles (AuNPs) and tyrosinase (Tyr) within a dihexadecylphosphate film is proposed. Cystamine and glutaraldehyde crosslinking agents were used as a support for Tyr immobilization. The proposed biosensor was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and cyclic voltammetry in the presence of catechol. The determination of catechol was carried out by amperometry and presented a linear concentration range from 2.5×10(-6) to 9.5×10(-5)molL(-1) with a detection limit of 1.7×10(-7)molL(-1). The developed biosensor showed good repeatability and stability. Moreover, this novel amperometric method was successfully applied in the determination of catechol in natural water samples. The results were in agreement with a 95% confidence level for those obtained using the official spectrophotometric method.
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Affiliation(s)
- Fernando Campanhã Vicentini
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P.O. Box 676, 13560-970 São Carlos, SP, Brazil; Center of Nature Sciences, Federal University of São Carlos, Rod. Lauri Simões de Barros km 12, 18290-000 Buri, SP, Brazil.
| | - Lívia L C Garcia
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P.O. Box 676, 13560-970 São Carlos, SP, Brazil
| | - Luiz C S Figueiredo-Filho
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P.O. Box 676, 13560-970 São Carlos, SP, Brazil; Federal Institute of Paraná, Câmpus Paranavaí, Rua José Felipe Tequinha 1400, Jardim das Nações 87703-536, Paranavaí, PR, Brazil
| | - Bruno C Janegitz
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P.O. Box 676, 13560-970 São Carlos, SP, Brazil; Department of Natural Sciences, Mathematics and Education, Federal University of São Carlos, 13600-970 Araras, SP, Brazil
| | - Orlando Fatibello-Filho
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P.O. Box 676, 13560-970 São Carlos, SP, Brazil
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Microplate based optical biosensor for l-Dopa using tyrosinase from Amorphophallus campanulatus. Anal Chim Acta 2014; 849:50-6. [DOI: 10.1016/j.aca.2014.08.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/10/2014] [Indexed: 11/21/2022]
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18
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Požar J, Kovačević D. Complexation between polyallylammonium cations and polystyrenesulfonate anions: the effect of ionic strength and the electrolyte type. SOFT MATTER 2014; 10:6530-6545. [PMID: 25043702 DOI: 10.1039/c4sm00651h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Complexation between polyallylammonium cations and polystyrenesulfonate anions was investigated in aqueous solutions of binary 1 : 1 sodium electrolytes (NaX, X = F, Cl, Br, I, NO3, ClO4) by means of microcalorimetry, dynamic light scattering, electrokinetics and spectrophotometry. At lower molar ratios of monomer units charged polyelectrolyte complexes were formed. At molar ratios close to equivalence and at lower salt concentrations (c(NAX)/mol dm(-3) ≤ 0.1) flocculation occurred. The obtained precipitates contained approximately equimolar amounts of oppositely charged monomer units. At c(NAX)/mol dm(-3) ≥ 0.5 (X = NO3, ClO4) and in the case when the polycation was present in excess, the amount of positively charged monomer units in the precipitate was higher than that of negatively charged monomers (asymmetric neutralisation). In addition, the aggregation of positively charged complexes in concentrated solutions of all investigated electrolytes was noticed. The onset of aggregation was strongly anion specific. However, the aggregation of negatively charged complexes did not occur even at c(NaX) = 3 mol dm(-3). The composition of the insoluble products at equimolar ratio of monomer units and higher concentrations of NaNO3 and NaClO4 was dependent on the order of addition, indicating non-equilibrium interpolyelectrolyte neutralisation under all ionic conditions. At 25 °C and c(NaClO4) = 1 mol dm(-3) equilibrium was not reached after two months. In contrast, the supernatants showed no traces of free polyanion chains after being heated for a week at 60 °C. The pairing of monomer units was predominantly entropically driven, irrespective of the type of reaction products formed (polyelectrolyte complexes, precipitates) and the electrolyte type. The results obtained indicate that the overcharging is not an enthalpically demanding process. The calorimetric measurements also suggest that the strong influence of counteranions on the composition of the reaction product must be related to differences in ion distribution around polycations. However, despite rather similar energetics for complex and precipitate formation in the presence of various sodium salts a clear correlation of formation enthalpies with corresponding anion hydration enthalpies (Hofmeister series) was observed. Somewhat surprisingly, the titration calorimetry experiments have also revealed that the increase in electrolyte concentration affects the enthalpy of interpolyelectrolyte neutralisation negligibly.
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Affiliation(s)
- Josip Požar
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
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19
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Tyrosinase Multilayer-Functionalised Carbon Nanotubes as Electrochemical Labels: Application To Immunoassay. BIONANOSCIENCE 2014. [DOI: 10.1007/s12668-014-0144-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Sigolaeva LV, Günther U, Pergushov DV, Gladyr SY, Kurochkin IN, Schacher FH. Sequential pH-Dependent Adsorption of Ionic Amphiphilic Diblock Copolymer Micelles and Choline Oxidase Onto Conductive Substrates: Toward the Design of Biosensors. Macromol Biosci 2014; 14:1039-51. [DOI: 10.1002/mabi.201300580] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 02/24/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Larisa V. Sigolaeva
- Department of Chemistry; Lomonosov Moscow State University; 119991 Moscow Russia
| | - Ulrike Günther
- Institute of Organic and Macromolecular Chemistry; Friedrich-Schiller-University Jena; D-07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich-Schiller-University Jena; D-07743 Jena Germany
| | - Dmitry V. Pergushov
- Department of Chemistry; Lomonosov Moscow State University; 119991 Moscow Russia
| | - Snezhana Yu. Gladyr
- Department of Chemistry; Lomonosov Moscow State University; 119991 Moscow Russia
| | - Ilya N. Kurochkin
- Department of Chemistry; Lomonosov Moscow State University; 119991 Moscow Russia
| | - Felix H. Schacher
- Institute of Organic and Macromolecular Chemistry; Friedrich-Schiller-University Jena; D-07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich-Schiller-University Jena; D-07743 Jena Germany
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Subrizi F, Crucianelli M, Grossi V, Passacantando M, Pesci L, Saladino R. Carbon Nanotubes as Activating Tyrosinase Supports for the Selective Synthesis of Catechols. ACS Catal 2014. [DOI: 10.1021/cs400856e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Fabiana Subrizi
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Marcello Crucianelli
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Valentina Grossi
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Maurizio Passacantando
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Lorenzo Pesci
- Department
of Ecology and Biology, University of Tuscia, Largo dell’Università, 01100 Viterbo, VT, Italy
| | - Raffaele Saladino
- Department
of Ecology and Biology, University of Tuscia, Largo dell’Università, 01100 Viterbo, VT, Italy
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Bozzini T, Botta G, Delfino M, Onofri S, Saladino R, Amatore D, Sgarbanti R, Nencioni L, Palamara AT. Tyrosinase and Layer-by-Layer supported tyrosinases in the synthesis of lipophilic catechols with antiinfluenza activity. Bioorg Med Chem 2013; 21:7699-708. [DOI: 10.1016/j.bmc.2013.10.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/11/2013] [Accepted: 10/18/2013] [Indexed: 12/20/2022]
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Self-assembled films containing crude extract of avocado as a source of tyrosinase for monophenol detection. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:3899-902. [DOI: 10.1016/j.msec.2013.05.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 04/15/2013] [Accepted: 05/12/2013] [Indexed: 11/20/2022]
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24
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Ramos JJI, Llarena I, Moya SE. Unusual collapse of highly hydrated polyelectrolyte multilayers with the ionic strength. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24662] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Psoma SD, van der Wal PD, de Rooij NF. Low Fluorescence Enzyme Matrices Based on Microfabricated SU-8 Films for a Phenol Micro-Biosensor Application. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.proeng.2011.12.338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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26
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Liu J, Niu J, Yin L, Jiang F. In situ encapsulation of laccase in nanofibers by electrospinning for development of enzyme biosensors for chlorophenol monitoring. Analyst 2011; 136:4802-8. [DOI: 10.1039/c1an15649g] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Cheng WP, Thompson C, Ryan SM, Aguirre T, Tetley L, Brayden DJ. In vitro and in vivo characterisation of a novel peptide delivery system: amphiphilic polyelectrolyte-salmon calcitonin nanocomplexes. J Control Release 2010; 147:289-97. [PMID: 20705108 DOI: 10.1016/j.jconrel.2010.07.128] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 07/29/2010] [Accepted: 07/31/2010] [Indexed: 11/16/2022]
Abstract
The cationic peptide, salmon calcitonin (sCT) was complexed with the cationic amphiphilic polyelectrolyte, poly(allyl)amine, grafted with palmitoyl and quaternary ammonium moieties at pH 5.0 and 7.4 to yield particulates (sCT-QPa). The complexes were approximately 200 nm in diameter, had zeta potentials ranging from +20 to +50 mV, and had narrow polydispersity indices (PDIs). Differential scanning calorimetry revealed the presence of an interaction between sCT and QPa in the complexes. Electron microscopy confirmed the zeta-size data and revealed a vesicular bilayer structure with an aqueous core. Tyrosine- and Nile red fluorescence indicated that the complexes retained gross physical stability for up to 7 days, but that the pH 5.0 complexes were more stable. The complexes were more resistant to peptidases, serum and liver homogenates compared to free sCT. In vitro bioactivity was measured by cAMP production in T47D cells and the complexes had EC50 values in the nM range. While free sCT was unable to generate cAMP following storage for 7 days, the complexes retained approximately 33% activity. When the complexes were injected intravenously to rats, free and complexed sCT (pH 5.0 and 7.4) but not QPa reduced serum calcium over 120 min. Free and complexed sCT but not QPa also reduced serum calcium over 240 min following intra-jejunal administration. In conclusion, sCT-QPa nanocomplexes that have been synthesised are stable, bioactive and resistant to a range of peptidases. These enhanced features suggest that they may have the potential for improved efficacy when formulated for injected and oral delivery.
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Affiliation(s)
- Woei-Ping Cheng
- School of Pharmacy, University of Hertfordshire, College Lane Hatfield AL10 9AB, UK
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