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Rafi H, Rafiq H, Farhan M. Pharmacological profile of agmatine: An in-depth overview. Neuropeptides 2024; 105:102429. [PMID: 38608401 DOI: 10.1016/j.npep.2024.102429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 03/14/2024] [Accepted: 04/01/2024] [Indexed: 04/14/2024]
Abstract
Agmatine, a naturally occurring polyamine derived from arginine via arginine decarboxylase, has been shown to play multifaceted roles in the mammalian body, impacting a wide range of physiological and pathological processes. This comprehensive review delineates the significant insights into agmatine's pharmacological profile, emphasizing its structure and metabolism, neurotransmission and regulation, and pharmacokinetics and function. Agmatine's biosynthesis is highly conserved across species, highlighting its fundamental role in cellular functions. In the brain, comparable to established neurotransmitters, agmatine acts as a neuromodulator, influencing the regulation, metabolism, and reabsorption of neurotransmitters that are key to mood disorders, learning, cognition, and the management of anxiety and depression. Beyond its neuromodulatory functions, agmatine exhibits protective effects across various cellular and systemic contexts, including neuroprotection, nephroprotection, cardioprotection, and cytoprotection, suggesting a broad therapeutic potential. The review explores agmatine's interaction with multiple receptor systems, including NMDA, α2-adrenoceptors, and imidazoline receptors, elucidating its role in enhancing cell viability, neuronal protection, and synaptic plasticity. Such interactions underpin agmatine's potential in treating neurological diseases and mood disorders, among other conditions. Furthermore, agmatine's pharmacokinetics, including its absorption, distribution, metabolism, and excretion, are discussed, underlining the complexity of its action and the potential for therapeutic application. The safety and efficacy of agmatine supplementation, demonstrated through various animal and human studies, affirm its potential as a beneficial therapeutic agent. Conclusively, the diverse physiological and therapeutic effects of agmatine, spanning neurotransmission, protection against cellular damage, and modulation of various receptor pathways, position it as a promising candidate for further research and clinical application. This review underscores the imperative for continued exploration into agmatine's mechanisms of action and its potential in pharmacology and medicine, promising advances in the treatment of numerous conditions.
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Affiliation(s)
- Hira Rafi
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA; Department of Biochemistry, University of Karachi, Pakistan.
| | - Hamna Rafiq
- Department of Biochemistry, University of Karachi, Pakistan
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2
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El-Maghrabey M, Kishikawa N, Kuroda N. Unique biomedical application of fluorescence derivatization based on palladium-catalyzed coupling reactions for HPLC analysis of pharmaceuticals and biomolecules. Biomed Chromatogr 2024:e5857. [PMID: 38509750 DOI: 10.1002/bmc.5857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/31/2024] [Accepted: 02/13/2024] [Indexed: 03/22/2024]
Abstract
Palladium-catalyzed coupling reactions are versatile and powerful tools for the construction of carbon-carbon bonds in organic synthesis. Although these reactions have favorable features that proceed selectively in mild reaction conditions using aqueous organic solvents, no attention has been given to their application in the field of biomedical analysis. Therefore, we focused on these reactions and evaluated the scope and limitations of their analytical performance. In this review, we describe the pros and cons and future trends of fluorescence derivatization of pharmaceuticals and biomolecules based on palladium-catalyzed coupling reactions such as Suzuki-Miyaura coupling, Mizoroki-Heck coupling, and Sonogashira coupling reactions for HPLC analysis.
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Affiliation(s)
- Mahmoud El-Maghrabey
- Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, Nagasaki, Japan
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Naoya Kishikawa
- Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, Nagasaki, Japan
| | - Naotaka Kuroda
- Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, Nagasaki, Japan
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3
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Jastrzębska A, Kmieciak A, Gralak Z, Brzuzy K, Krzemiński M, Gorczyca D, Szłyk E. A new approach for analysing biogenic amines in meat samples: Microwave-assisted derivatisation using 2-chloro-3-nitropyridine. Food Chem 2024; 436:137686. [PMID: 37839119 DOI: 10.1016/j.foodchem.2023.137686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 10/17/2023]
Abstract
Biogenic amines are compounds whose occurrence in meat is linked to the presence of undesirable microorganisms. They can be utilised as a means to assess the quality and purity of the raw material. Therefore, the methods used to determine their levels are crucial in ensuring meat safety. We propose 2-chloro-3-nitropyridine as a new reagent for microwave-assisted synthesis of biogenic amine derivatives. The obtained products were synthesised with high purity and yield and characterised using 1H and 13C NMR as well as high-resolution mass spectrometry. The proposed derivatisation procedure, coupled with the HPLC method, was applied to determine the levels of biogenic amines in sirloin, ham, and chicken breast samples. Furthermore, differences in the content of the aforementioned compounds in the meat samples were analysed after storage for 24 and 72 h. The results suggest that cadaverine can be considered the primary indicator of meat changes, regardless of its type.
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Affiliation(s)
- Aneta Jastrzębska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland.
| | - Anna Kmieciak
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland
| | - Zuzanna Gralak
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland
| | - Kamil Brzuzy
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland
| | - Marek Krzemiński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland
| | - Damian Gorczyca
- Lazarski University, 43 Świeradowska Str., 02-662 Warsaw, Poland; LymeLab Pharma, Kochanowskiego 49A Str., 01-864 Warsaw, Poland
| | - Edward Szłyk
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Str., 87-100 Toruń, Poland
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4
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Nadekar B, Khollam YB, Shaikh SF, Shah G, Kakade Y, Banewar V, Nakate UT, Al Enizi AM, More PS. Biphenyl-rGO composite room temperature gas sensor for enhanced amine sensing. CHEMOSPHERE 2024; 351:141244. [PMID: 38242515 DOI: 10.1016/j.chemosphere.2024.141244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/23/2023] [Accepted: 01/16/2024] [Indexed: 01/21/2024]
Abstract
Amines, which are classified as volatile organic compounds (VOCs), serve a variety of purposes in the fields of environmental monitoring, food safety, and healthcare diagnosis. The present technique for detecting amine levels involves sophisticated setups and bulky equipment. Here. In this study, a chemoresistive gas sensor is developed that is cost-effective and easy to operate at room temperature (RT). The sensor is designed specifically for the detection of Ammonia, dimethylamine (DMA), trimethylamine (TMA), and total volatile basic nitrogen (TVB-N). Using biphenyl-reduced graphene oxide (B-rGO) composite gas sensors effectively addresses the issues of low sensitivity-selectivity and long-term instability commonly observed in conventional amine sensors. B-rGO sensor produced sensitivity of ∼3500 and selectivity above 30 for TVB-N sensing. The sensor is stable for temperature fluctuations below 50 °C and shows stable sensing response for period of over 3 months. A Chemoresistive B-rGO sensor was developed using an ultrasonic spray deposition system with optimized flow rate of 50 mL/h. Rapid evaporation of solvent using hot plate has resulted in unique morphology for B-rGO film sensors. The highest sensitivity, ∼836, is obtained for 100 ppm of ammonia with ammonia > DMA > TMA as a sensitivity order. B-rGO showed almost seven times higher amine sensitivity than rGO which highlights the importance of biphenyl in the B-rGO composite. Sensor calibration curve has been presented in the study to understand change in the sensitivity of sensor with increasing analyte gas concentration. The calibration curve has an average R-squared value of 0.98.
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Affiliation(s)
- Baliram Nadekar
- Nanomaterials Application Laboratory, Department of Physics, The Institute of Science, Fort, Mumbai, 400032, Maharashtra, India
| | - Yogesh B Khollam
- Department of Physics, Baburaoji Gholap College, Sangvi, Pune, 411027. Maharashtra, India
| | - Shoyebmohamad F Shaikh
- Department of Chemistry, College of Science, Bld-5, King Saud University, Riyadh, Saudi Arabia
| | - Gaurav Shah
- Nanomaterials Application Laboratory, Department of Physics, The Institute of Science, Fort, Mumbai, 400032, Maharashtra, India
| | - Yogesh Kakade
- Nanomaterials Application Laboratory, Department of Physics, The Institute of Science, Fort, Mumbai, 400032, Maharashtra, India
| | - Vishal Banewar
- Department of Chemitry, The Institute of Science, Fort, Mumbai, 400032, Maharashtra, India
| | - Umesh T Nakate
- Department of Polymer-Nano Science and Technology, Jeonbuk National University (JBNU), Jeonju-Si, Jeollabuk-do, Republic of Korea
| | - Abdullah M Al Enizi
- Department of Chemistry, College of Science, Bld-5, King Saud University, Riyadh, Saudi Arabia
| | - Pravin S More
- Nanomaterials Application Laboratory, Department of Physics, The Institute of Science, Fort, Mumbai, 400032, Maharashtra, India.
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Torre R, Costa-Rama E, Nouws HPA, Delerue-Matos C. A do-it-yourself electrochemical cell based on pencil leads and transparency sheets: Application to the enzymatic determination of histamine. Talanta 2024; 266:124980. [PMID: 37536106 DOI: 10.1016/j.talanta.2023.124980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 07/10/2023] [Accepted: 07/22/2023] [Indexed: 08/05/2023]
Abstract
The availability of more efficient analytical methods that answer the world's demands is a challenge and their development continues to be a difficult task. In this work the construction of an electrochemical cell, based on low-cost and accessible materials, that can be easily constructed and used for electroanalytical purposes, is described. Pencil leads were used as electrodes and a transparency sheet as the base. This cell was used as transducer for developing an amperometric biosensor for the quantification of histamine, which is the only biogenic amine regulated by law. The analysis was based on the use of diamine oxidase as biorecognition element, hexacyanoferrate(III) as electron-transfer mediator, and chronoamperometry, at +0.5 V during 100 s, to record the analytical signal. A linear relationship between histamine concentration and the analytical signal was established between 5.0 and 35 mg L-1 and a low limit of detection (1.0 mg L-1) was achieved. The analysis of different fish species (sardine and tuna) was performed, obtaining recovery values between 102% and 110%. The stability of the sensor is noteworthy: it maintained 95% of the initial analytical signal after 15 days.
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Affiliation(s)
- Ricarda Torre
- REQUIMTE/LAQV, Instituto Superior de Engenharia Do Porto, Instituto Politécnico Do Porto, Rua Dr. António Bernardino de Almeida 431, 4249-015, Porto, Portugal
| | - Estefania Costa-Rama
- Departamento de Química Física y Analítica, Universidad de Oviedo, Av. Julián Clavería 8, 33006, Oviedo, Spain.
| | - Henri P A Nouws
- REQUIMTE/LAQV, Instituto Superior de Engenharia Do Porto, Instituto Politécnico Do Porto, Rua Dr. António Bernardino de Almeida 431, 4249-015, Porto, Portugal
| | - Cristina Delerue-Matos
- REQUIMTE/LAQV, Instituto Superior de Engenharia Do Porto, Instituto Politécnico Do Porto, Rua Dr. António Bernardino de Almeida 431, 4249-015, Porto, Portugal.
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Thamsborg KKM, Lund BW, Byrne DV, Leisner JJ, Alexi N. Cadaverine as a Potential Spoilage Indicator in Skin-Packed Beef and Modified-Atmosphere-Packed Beef. Foods 2023; 12:4489. [PMID: 38137293 PMCID: PMC10742596 DOI: 10.3390/foods12244489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
This study investigated cadaverine as a spoilage indicator in commercial beef products stored under conditions favourable for the growth of lactic acid bacteria. Samples included vacuum-skin-packed entrecotes (EB) aged up to 42 days and modified-atmosphere-packed (70% O2 + 30% CO2) minced beef (MB) stored at 5 °C. Two MB product lines were analysed: one stored aerobically two days post-slaughter before mincing and another stored for 14 days in vacuum packaging prior to mincing. Sensory assessment/evaluation and microbial analysis were performed throughout the shelf life of the products and compared to cadaverine levels measured using LC-MS/MS. Cadaverine concentrations in EB reached approximately 40,000 µg/kg on the "best before" date, while remaining below 50 µg/kg in both MB products on the corresponding date. While cadaverine concentrations in EB displayed a consistent increase, suggesting its potential as a spoilage indicator post-ageing, the low concentrations in MB, did not correlate with sensory assessments, revealing its limitations as a universal spoilage marker. In conclusion, it is necessary to conduct product-specific studies to evaluate the applicability of cadaverine as a spoilage indicator for beef products.
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Affiliation(s)
- Kristian Key Milan Thamsborg
- Department of Veterinary and Animal Sciences, University of Copenhagen, Grønnegårdsvej 15, 1870 Copenhagen, Denmark
| | | | - Derek Victor Byrne
- Food Quality Perception and Society Science Team, iSENSE Lab, Department of Food Science, Faculty of Technical Sciences, Aarhus University, Agro Food Park 48, 8200 Aarhus N, Denmark; (D.V.B.); (N.A.)
| | - Jørgen Johannes Leisner
- Department of Veterinary and Animal Sciences, University of Copenhagen, Grønnegårdsvej 15, 1870 Copenhagen, Denmark
| | - Niki Alexi
- Food Quality Perception and Society Science Team, iSENSE Lab, Department of Food Science, Faculty of Technical Sciences, Aarhus University, Agro Food Park 48, 8200 Aarhus N, Denmark; (D.V.B.); (N.A.)
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Wagner P, Bakhshi Sichani S, Khorshid M, Lieberzeit P, Losada-Pérez P, Yongabi D. Bioanalytical sensors using the heat-transfer method HTM and related techniques. TECHNISCHES MESSEN : TM 2023; 90:761-785. [PMID: 38046181 PMCID: PMC10690833 DOI: 10.1515/teme-2023-0101] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 09/12/2023] [Indexed: 12/05/2023]
Abstract
This review provides an overview on bio- and chemosensors based on a thermal transducer platform that monitors the thermal interface resistance R th between a solid chip and the supernatant liquid. The R th parameter responds in a surprisingly strong way to molecular-scale changes at the solid-liquid interface, which can be measured thermometrically, using for instance thermocouples in combination with a controllable heat source. In 2012, the effect was first observed during on-chip denaturation experiments on complementary and mismatched DNA duplexes that differ in their melting temperature. Since then, the concept is addressed as heat-transfer method, in short HTM, and numerous applications of the basic sensing principle were identified. Functionalizing the chip with bioreceptors such as molecularly imprinted polymers makes it possible to detect neurotransmitters, inflammation markers, viruses, and environmental pollutants. In combination with aptamer-type receptors, it is also possible to detect proteins at low concentrations. Changing the receptors to surface-imprinted polymers has opened up new possibilities for quantitative bacterial detection and identification in complex matrices. In receptor-free variants, HTM was successfully used to characterize lipid vesicles and eukaryotic cells (yeast strains, cancer cell lines), the latter showing spontaneous detachment under influence of the temperature gradient inherent to HTM. We will also address modifications to the original HTM technique such as M-HTM, inverted HTM, thermal wave transport analysis TWTA, and the hot-wire principle. The article concludes with an assessment of the possibilities and current limitations of the method, together with a technological forecast.
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Affiliation(s)
- Patrick Wagner
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics ZMB, KU Leuven, Celestijnenlaan 200 D, B-3001Leuven, Belgium
| | - Soroush Bakhshi Sichani
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics ZMB, KU Leuven, Celestijnenlaan 200 D, B-3001Leuven, Belgium
| | - Mehran Khorshid
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics ZMB, KU Leuven, Celestijnenlaan 200 D, B-3001Leuven, Belgium
| | - Peter Lieberzeit
- Department of Physical Chemistry, University of Vienna, Währingerstrasse 42, A-1090Wien, Austria
| | - Patricia Losada-Pérez
- Physique Expérimentale Thermique et de la Matière Molle, Université Libre de Bruxelles, Campus de la Plaine – CP 223, Boulevard du Triomphe, ACC.2, B-1050Bruxelles, Belgium
| | - Derick Yongabi
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics ZMB, KU Leuven, Celestijnenlaan 200 D, B-3001Leuven, Belgium
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Zeußel L, Singh S. Meldrum's Acid Furfural Conjugate MAFC: A New Entry as Chromogenic Sensor for Specific Amine Identification. Molecules 2023; 28:6627. [PMID: 37764403 PMCID: PMC10535807 DOI: 10.3390/molecules28186627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Bioactive amines are highly relevant for clinical and industrial application to ensure the metabolic status of a biological process. Apart from this, generally, amine identification is a key step in various bioorganic processes ranging from protein chemistry to biomaterial fabrication. However, many amines have a negative impact on the environment and the excess intake of amines can have tremendous adverse health effects. Thus, easy, fast, sensitive, and reliable sensing methods for amine identification are strongly searched for. In the past few years, Meldrum's acid furfural conjugate (MAFC) has been extensively explored as a starting material for the synthesis of photoswitchable donor-acceptor Stenhouse adducts (DASA). DASA formation hereby results from the rapid reaction of MAFC with primary and secondary amines, which has so far been demonstrated through numerous publications for different applications. The linear form of the MAFC-based DASA exhibits intense pink coloration due to its linear conjugated triene-2-ol conformation, which has inspired researchers to use this easy synthesizable molecule as an optical sensor for primary, secondary, and biogenic amines. Due to its new entry into amine identification, a collection of the literature exclusively on MAFC is demanded. In this mini review, we intend to present the state-of-the-art of MAFC as an optical molecular sensor in hopes to motivate researchers to find even more applications of MAFC-based sensors and methods that pave the way to their usage in medicinal applications.
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Affiliation(s)
- Lisa Zeußel
- Department of Nanobiosystem Technology, Institute of Chemistry and Biotechnology, Technical University Ilmenau, Prof-Schmidt-Straße 26, 98693 Ilmenau, Germany;
- Research Group Bioorganic Chemistry of Bioactive Surfaces, Institute of Chemistry and Biotechnology, Prof-Schmidt-Straße 26, 98693 Ilmenau, Germany
| | - Sukhdeep Singh
- Research Group Bioorganic Chemistry of Bioactive Surfaces, Institute of Chemistry and Biotechnology, Prof-Schmidt-Straße 26, 98693 Ilmenau, Germany
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Domínguez M, Oliver S, Garriga R, Muñoz E, Cebolla VL, de Marcos S, Galbán J. Tectomer-Mediated Optical Nanosensors for Tyramine Determination. SENSORS (BASEL, SWITZERLAND) 2023; 23:2524. [PMID: 36904726 PMCID: PMC10007293 DOI: 10.3390/s23052524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 06/18/2023]
Abstract
The development of optical sensors for in situ testing has become of great interest in the rapid diagnostics industry. We report here the development of simple, low-cost optical nanosensors for the semi-quantitative detection or naked-eye detection of tyramine (a biogenic amine whose production is commonly associated with food spoilage) when coupled to Au(III)/tectomer films deposited on polylactic acid (PLA) supports. Tectomers are two-dimensional oligoglycine self-assemblies, whose terminal amino groups enable both the immobilization of Au(III) and its adhesion to PLA. Upon exposure to tyramine, a non-enzymatic redox reaction takes place in which Au(III) in the tectomer matrix is reduced by tyramine to gold nanoparticles, whose reddish-purple color depends on the tyramine concentration and can be identified by measuring the RGB coordinates (Red-Green-Blue coordinates) using a smartphone color recognition app. Moreover, a more accurate quantification of tyramine in the range from 0.048 to 10 μM could be performed by measuring the reflectance of the sensing layers and the absorbance of the characteristic 550 nm plasmon band of the gold nanoparticles. The relative standard deviation (RSD) of the method was 4.2% (n = 5) with a limit of detection (LOD) of 0.014 μM. A remarkable selectivity was achieved for tyramine detection in the presence of other biogenic amines, especially histamine. This methodology, based on the optical properties of Au(III)/tectomer hybrid coatings, is promising for its application in food quality control and smart food packaging.
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Affiliation(s)
- Mario Domínguez
- Nanosensors and Bioanalytical Systems (N&SB), Analytical Chemistry Department, Faculty of Sciences, Instituto de Nanociencia y Materiales de Aragón (INMA University of Zaragoza-CSIC), 50009 Zaragoza, Spain
| | - Sofía Oliver
- Nanosensors and Bioanalytical Systems (N&SB), Analytical Chemistry Department, Faculty of Sciences, Instituto de Nanociencia y Materiales de Aragón (INMA University of Zaragoza-CSIC), 50009 Zaragoza, Spain
| | - Rosa Garriga
- Departamento de Química-Física, University of Zaragoza, 50009 Zaragoza, Spain
| | - Edgar Muñoz
- Instituto de Carboquímica ICB-CSIC, 50018 Zaragoza, Spain
| | | | - Susana de Marcos
- Nanosensors and Bioanalytical Systems (N&SB), Analytical Chemistry Department, Faculty of Sciences, Instituto de Nanociencia y Materiales de Aragón (INMA University of Zaragoza-CSIC), 50009 Zaragoza, Spain
| | - Javier Galbán
- Nanosensors and Bioanalytical Systems (N&SB), Analytical Chemistry Department, Faculty of Sciences, Instituto de Nanociencia y Materiales de Aragón (INMA University of Zaragoza-CSIC), 50009 Zaragoza, Spain
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