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Hecko S, Schiefer A, Badenhorst CPS, Fink MJ, Mihovilovic MD, Bornscheuer UT, Rudroff F. Enlightening the Path to Protein Engineering: Chemoselective Turn-On Probes for High-Throughput Screening of Enzymatic Activity. Chem Rev 2023; 123:2832-2901. [PMID: 36853077 PMCID: PMC10037340 DOI: 10.1021/acs.chemrev.2c00304] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Many successful stories in enzyme engineering are based on the creation of randomized diversity in large mutant libraries, containing millions to billions of enzyme variants. Methods that enabled their evaluation with high throughput are dominated by spectroscopic techniques due to their high speed and sensitivity. A large proportion of studies relies on fluorogenic substrates that mimic the chemical properties of the target or coupled enzymatic assays with an optical read-out that assesses the desired catalytic efficiency indirectly. The most reliable hits, however, are achieved by screening for conversions of the starting material to the desired product. For this purpose, functional group assays offer a general approach to achieve a fast, optical read-out. They use the chemoselectivity, differences in electronic and steric properties of various functional groups, to reduce the number of false-positive results and the analytical noise stemming from enzymatic background activities. This review summarizes the developments and use of functional group probes for chemoselective derivatizations, with a clear focus on screening for enzymatic activity in protein engineering.
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Affiliation(s)
- Sebastian Hecko
- Institute of Applied Synthetic Chemistry, OC-163, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Astrid Schiefer
- Institute of Applied Synthetic Chemistry, OC-163, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Christoffel P S Badenhorst
- Institute of Biochemistry, Dept. of Biotechnology & Enzyme Catalysis, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany
| | - Michael J Fink
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St, Cambridge, Massachusetts 02138, United States
| | - Marko D Mihovilovic
- Institute of Applied Synthetic Chemistry, OC-163, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Uwe T Bornscheuer
- Institute of Biochemistry, Dept. of Biotechnology & Enzyme Catalysis, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany
| | - Florian Rudroff
- Institute of Applied Synthetic Chemistry, OC-163, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
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2
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Miller K, Reichert CL, Schmid M. Biogenic Amine Detection Systems for Intelligent Packaging Concepts: Meat and Meat Products. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1961270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- K. Miller
- Department of Life Sciences, Sustainable Packaging Institute SPI, Faculty of Life Sciences, Albstadt-Sigmaringen University, Sigmaringen, Germany
| | - C. L. Reichert
- Department of Life Sciences, Sustainable Packaging Institute SPI, Faculty of Life Sciences, Albstadt-Sigmaringen University, Sigmaringen, Germany
| | - M. Schmid
- Department of Life Sciences, Sustainable Packaging Institute SPI, Faculty of Life Sciences, Albstadt-Sigmaringen University, Sigmaringen, Germany
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Wolfbeis OS. Fluorescent chameleon labels for bioconjugation and imaging of proteins, nucleic acids, biogenic amines and surface amino groups. a review. Methods Appl Fluoresc 2021; 9. [PMID: 34340216 DOI: 10.1088/2050-6120/ac1a0a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 08/02/2021] [Indexed: 12/14/2022]
Abstract
Chameleon labels (ChLs) possess the unique property of changing (visible) color and fluorescence on binding to amino groups of biomolecules. MostChLs react with primary aliphatic amino groups such as those in lysine or with amino groups artificially introduced into polynucleic acids or saccharides, but someothers also react with secondary amino groups. Under controlled circumstances, the reactions are fairly specific. The review is subdivided into the following sections: (1) An introduction and classification of fluorescent labels; (2) pyrylium labels that undergo shortwave color changes upon labelling, typically from blue to red; (3) polymethine type of labels (that also undergo shortwave color changes, typically from green to blue; (4) various other (less common) chromogenic and fluorogenic systems; (5) hemicyanine labels that undergolongwavecolor changes, typically from yellow to purple; (6) the application of ChLs to labeling of proteins and oligonucleotides; (7) applications to fluorometric assays and sensing; (8) applications to fluorescence imaging of biomolecules; (9) applications in studies on affinity interactions (receptor-ligand binding); (10) applications in surface and interface chemistry; and (11) applications in chromatography, electrophoresis and isotachophoresis of biomolecules.
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Affiliation(s)
- Otto S Wolfbeis
- University of Regensburg, Institute of Analytical Chemistry, Chemo- and Biosensors, 94040 Regensburg, Germany
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Munzi G, Failla S, Di Bella S. Highly selective and sensitive colorimetric/fluorometric dual mode detection of relevant biogenic amines. Analyst 2021; 146:2144-2151. [PMID: 33538722 DOI: 10.1039/d0an02336a] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Biogenic amines are involved in physiological roles in living organisms, but their excessive production or intake can induce undesired toxicological effects. As biogenic amines can be found in the process of food spoilage, they are considered an indicator of food quality and freshness, and their detection is of crucial importance in food safety. In this contribution, we report the fast and direct colorimetric and fluorometric sensing of biogenic amines by means of a dinuclear Zn(ii) Schiff-base complex. The selective and sensitive detection involves the formation of stable adducts between the dinuclear complex, acting as the Lewis acidic molecular tweezer, and biogenic di- or polyamines. The selectivity towards biogenic amines, even in the presence of common aliphatic, primary, secondary, or tertiary monoamines, heterocyclic amines, and amino acids, is demonstrated by competitive experiments. The quantitation of histamine in a fish matrix is easily achieved using a standard extraction procedure followed by simple colorimetric or fluorometric measurements.
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Affiliation(s)
- Gabriella Munzi
- Dipartimento di Scienze Chimiche, Università di Catania, I-95125 Catania, Italy.
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Bao C, Shao S, Zhou H, Han Y. A new ESIPT-based fluorescent probe for the highly sensitive detection of amine vapors. NEW J CHEM 2021. [DOI: 10.1039/d1nj01826d] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A new ESIPT-based fluorescent probe has been developed as a rapid, highly sensitive, and selective sensor for amine vapors.
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Affiliation(s)
- Cheng Bao
- Department of Chemistry
- Zhejiang Sci-Tech University
- Hangzhou
- China
| | - Sufang Shao
- Department of Chemistry
- Zhejiang Sci-Tech University
- Hangzhou
- China
| | - Haifeng Zhou
- Department of Chemistry
- Zhejiang Sci-Tech University
- Hangzhou
- China
- Hangzhou Xinqiao Biotechnology Co., Ltd
| | - Yifeng Han
- Department of Chemistry
- Zhejiang Sci-Tech University
- Hangzhou
- China
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6
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Dipsticks with Reflectometric Readout of an NIR Dye for Determination of Biogenic Amines. CHEMOSENSORS 2020. [DOI: 10.3390/chemosensors8040099] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Electrospun nanofibers (ENFs) are remarkable analytical tools for quantitative analysis since they are inexpensive, easily produced in uniform homogenous mats, and provide a high surface area-to-volume ratio. Taking advantage of these characteristics, a near-infrared (NIR)-dye was doped as chemosensor into ENFs of about 500 nm in diameter electrospun into 50 µm thick mats on indium tin oxide (ITO) supports. The mats were made of cellulose acetate (CA) and used as a sensor layer on optical dipsticks for the determination of biogenic amines (BAs) in food. The ENFs contained the chromogenic amine-reactive chameleon dye S0378 which is green and turns blue upon formation of a dye-BA conjugate. This SN1-reaction of the S0378 dye with various BAs was monitored by reflectance measurements at 635 nm where the intrinsic absorption of biological material is low. The difference of the reflectance before and after the reaction is proportional to BA levels from 0.04–1 mM. The LODs are in the range from 0.03–0.09 mM, concentrations that can induce food poisoning but are not recognized by the human nose. The calibration plots of histamine, putrescine, spermidine, and tyramine are very similar and suggesting the use of the dipsticks to monitor the total sample BA content. Furthermore, the dipsticks are selective to primary amines (both mono- and diamines) and show low interference towards most nucleophiles. A minute interference of proteins in real samples can be overcome by appropriate sample pretreatment. Hence, the ageing of seafood samples could be monitored via their total BA content which rose up to 21.7 ± 3.2 µmol/g over six days of storage. This demonstrates that optically doped NFs represent viable sensor and transducer materials for food analysis with dipsticks.
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Mayer M, Baeumner AJ. A Megatrend Challenging Analytical Chemistry: Biosensor and Chemosensor Concepts Ready for the Internet of Things. Chem Rev 2019; 119:7996-8027. [DOI: 10.1021/acs.chemrev.8b00719] [Citation(s) in RCA: 146] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Michael Mayer
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040 Regensburg, Germany
| | - Antje J. Baeumner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040 Regensburg, Germany
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Qi X, Wang WF, Wang J, Yang JL, Shi YP. Highly selective colorimetric detection of putrescine in fish products using o-phthalaldehyde derivatization reaction. Food Chem 2018; 259:245-250. [DOI: 10.1016/j.foodchem.2018.03.131] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 11/18/2017] [Accepted: 03/28/2018] [Indexed: 11/30/2022]
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9
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Kaur N, Chopra S, Singh G, Raj P, Bhasin A, Sahoo SK, Kuwar A, Singh N. Chemosensors for biogenic amines and biothiols. J Mater Chem B 2018; 6:4872-4902. [PMID: 32255063 DOI: 10.1039/c8tb00732b] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
There is burgeoning interest among supramolecular chemists to develop novel molecular systems to detect biogenic amines and bio-thiols in aqueous and non-aqueous media due to their potential role in biological processes. Biogenic amines are biologically important targets because of their involvement in the energy metabolism of human biological systems and their requirement is met through food and nutrition. However, the increasing instances of serious health problems due to food toxicity have raised the quality of food nowadays. Biogenic amines have been frequently considered as the markers or primary quality parameters of foods like antioxidant properties, freshness and spoilage. For instance, these amines such as spermine, spermidine, cadavarine, etc. may originate during microbial decarboxylation of amino acids of fermented foods/beverages. These amines may also react with nitrite available in certain meat products and concomitantly produce carcinogenic nitrosamine compounds. On the other hand, it is also well established that biothiols, particularly, thiol amino acids, provide the basic characteristics to food including flavor, color and texture that determine its acceptability. For instance, the reduction of thiol groups produces hydrogen sulfide which reduces flavour as in rotten eggs and spoiled fish, and the presence of hydrogen sulfide in fish is indicative of spoilage. Thus, biogenic amines and bio-thiols have attracted the profound interest of researchers as analytical tools for their quantification. Much scientific and technological information is issued every year, where the establishment of precise interactions of biogenic amines and bio-thiols with other molecules is sought in aqueous and non-aqueous media. This review summarizes the optical chemosensors developed for the selective detection of biogenic amines and bio-thiols.
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Affiliation(s)
- Navneet Kaur
- Department of Chemistry, Panjab University (PU), Chandigarh-160014, India.
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10
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Strøman P, Sørensen KI, Derkx PMF, Neves AR. Development of Tyrosine Decarboxylase-Negative Strains of Lactobacillus curvatus by Classical Strain Improvement. J Food Prot 2018; 81:628-635. [PMID: 29543528 DOI: 10.4315/0362-028x.jfp-17-301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biogenic amines have been widely studied because of their potential toxicity in fermented foods. Several lactic acid bacteria have the potential to decarboxylate the amino acid tyrosine to tyramine. In this work, we identified two strains of Lactobacillus curvatus, Lbc1 and Lbc2, endowed with the ability to produce tyramine, a metabolic feature that limits their application in starter cultures for fermented meat. To overcome this limitation, we set out to eliminate tyramine production from L. curvatus strains by using classical strain improvement. About 4,000 mutant isolates of both strains were screened using a colorimetric method, and then potential tyrosine decarboxylase-negative mutants were selected. Firm identification of loss-of-function mutants was performed by analytical determination of tyrosine and tyramine in cultivation medium. Of the 8,000 mutants screened, only one mutant of Lbc1 and two mutants of Lbc2 had completely lost the potential to produce tyramine. Subsequently, one tyrosine decarboxylase-negative mutant of both Lbc1 and Lbc2 was characterized in more detail. DNA sequencing of the Lbc1 mutant tdcA gene disclosed two missense mutations in the promoter distal part of the coding sequence. These two mutations result in two amino acid changes in the encoded tyrosine decarboxylase, Pro87Thr and Ser130Leu, presumably inactivating the enzyme activity. The DNA sequence of the other characterized mutant, derived from strain Lbc2, showed that insertion of a 6-bp fragment at nucleotide position 1348 in the tdc gene is presumably the factor leading to loss of activity. With the successful elimination of the undesirable tyramine-producing phenotype without the use of recombinant DNA technology, these developed L. curvatus mutant strains can be safely used in the dairy industry or in the manufacture of various food products.
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Affiliation(s)
- Per Strøman
- Discovery, Research & Development, Chr. Hansen A/S, Bøge Allé 10-12, 2970 Hørsholm, Denmark
| | - Kim Ib Sørensen
- Discovery, Research & Development, Chr. Hansen A/S, Bøge Allé 10-12, 2970 Hørsholm, Denmark
| | - Patrick M F Derkx
- Discovery, Research & Development, Chr. Hansen A/S, Bøge Allé 10-12, 2970 Hørsholm, Denmark
| | - Ana Rute Neves
- Discovery, Research & Development, Chr. Hansen A/S, Bøge Allé 10-12, 2970 Hørsholm, Denmark
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Yurova NS, Danchuk A, Mobarez SN, Wongkaew N, Rusanova T, Baeumner AJ, Duerkop A. Functional electrospun nanofibers for multimodal sensitive detection of biogenic amines in food via a simple dipstick assay. Anal Bioanal Chem 2017; 410:1111-1121. [PMID: 29116354 DOI: 10.1007/s00216-017-0696-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 09/18/2017] [Accepted: 10/06/2017] [Indexed: 01/28/2023]
Abstract
Electrospun nanofibers (ENFs) are promising materials for rapid diagnostic tests like lateral flow assays and dipsticks because they offer an immense surface area while excluding minimal volume, a variety of functional surface groups, and can entrap functional additives within their interior. Here, we show that ENFs on sample pads are superior in comparison to standard polymer membranes for the optical detection of biogenic amines (BAs) in food using a dipstick format. Specifically, cellulose acetate (CA) fibers doped with 2 mg/mL of the chromogenic and fluorogenic amine-reactive chameleon dye Py-1 were electrospun into uniform anionic mats. Those extract cationic BAs from real samples and Py-1 transduces BA concentrations into a change of color, reflectance, and fluorescence. Dropping a BA sample onto the nanofiber mat converts the weakly fluorescent pyrylium dye Py-1 into a strongly red emitting pyridinium dye. For the first time, a simple UV lamp excites fluorescence and a digital camera acts as detector. The intensity ratio of the red to the blue channel of the digital image is dependent on the concentration of most relevant BAs indicating food spoilage from 10 to 250 μM. This matches the permitted limits for BAs in foods and no false positive signals arise from secondary and tertiary amines. BA detection in seafood samples was also demonstrated successfully. The nanofiber mat dipsticks were up to sixfold more sensitive than those using a polymer membrane with the same dye embedded. Hence, nanofiber-based tests are not only superior to polymer-based dipstick assays, but will also improve the performance of established tests related to food safety, medical diagnostics, and environmental testing. Graphical Absract ᅟ.
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Affiliation(s)
- Nadezhda S Yurova
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany.,Institute of Chemistry, National Research Saratov State University, Saratov, Russian Federation
| | - Alexandra Danchuk
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany.,Institute of Chemistry, National Research Saratov State University, Saratov, Russian Federation
| | - Sarah N Mobarez
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany
| | - Nongnoot Wongkaew
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany
| | - Tatiana Rusanova
- Institute of Chemistry, National Research Saratov State University, Saratov, Russian Federation
| | - Antje J Baeumner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany
| | - Axel Duerkop
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany.
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Khairy GM, Azab HA, El-Korashy SA, Steiner MS, Duerkop A. Validation of a Fluorescence Sensor Microtiterplate for Biogenic Amines in Meat and Cheese. J Fluoresc 2016; 26:1905-16. [PMID: 27481500 DOI: 10.1007/s10895-016-1885-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 07/18/2016] [Indexed: 11/25/2022]
Abstract
An optical sensor microtiterplate for quantitative analysis of the total content of biogenic amines (TAC) in meat and cheese was developed and validated for the first time. In the plate, a chameleon dye (Py-1) is embedded in a polymeric cocktail which is deposited on the bottom of the wells in a common microtiterplate. On reaction with biogenic amines (BAs), the fluorescence of Py-1 at 620 nm rapidly delivers a precise TAC. After 10 min incubation at 25 °C the determination of the TAC in various (real) samples is possible in high-throughput with a standard microplate reader. The optimized fluorescence method was validated for linearity, sensitivity, accuracy, precision (intraday and inter day repeatability) and recovery using histamine (HIS) as a representative BA. The sensor microtiterplate was successfully applied to quantitatively analyze the TAC in 10 real samples of cheese and meat obtained from various Egyptian markets. The TAC of these real samples obtained by the sensor microtiterplate was validated against the contents of BAs obtained by GC-MS at various times of storage. The data of the sensor microtiterplate agreed well with those of GC-MS. This demonstrates that the sensor microtiterplate is a reliable screening tool for the degradation status of food samples.
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Affiliation(s)
- Gasser M Khairy
- Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt
- Chemistry Department, Faculty of Science and Arts, Aljouf University, P.O. Box # 2014, Skaka-41421, Kingdom of Saudi Arabia
| | - Hassan A Azab
- Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt
| | - Sabry A El-Korashy
- Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt
| | - Mark-Steven Steiner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040, Regensburg, Germany
| | - Axel Duerkop
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040, Regensburg, Germany.
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Ramon-Marquez T, Medina-Castillo AL, Fernandez-Gutierrez A, Fernandez-Sanchez JF. Novel optical sensing film based on a functional nonwoven nanofibre mat for an easy, fast and highly selective and sensitive detection of tryptamine in beer. Biosens Bioelectron 2016; 79:600-7. [DOI: 10.1016/j.bios.2015.12.091] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/23/2015] [Accepted: 12/24/2015] [Indexed: 11/15/2022]
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Nedeljko P, Turel M, Lobnik A. Fluorescence-Based Determination of Agmatine in Dietary Supplements. ANAL LETT 2015. [DOI: 10.1080/00032719.2014.991962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Wang Z, Liu F, Lu C. Evolution of biogenic amine concentrations in foods through their induced chemiluminescence inactivation of layered double hydroxide nanosheet colloids. Biosens Bioelectron 2014; 60:237-43. [DOI: 10.1016/j.bios.2014.04.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 04/03/2014] [Accepted: 04/07/2014] [Indexed: 12/29/2022]
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Chow CF, Lam MHW, Wong WY. Design and Synthesis of Heterobimetallic Ru(II)–Ln(III) Complexes as Chemodosimetric Ensembles for the Detection of Biogenic Amine Odorants. Anal Chem 2013; 85:8246-53. [DOI: 10.1021/ac401513j] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Cheuk-Fai Chow
- Department
of Science and Environmental
Studies, The Hong Kong Institute of Education, 10 Lo Ping Road, Tai Po Hong Kong SAR, China
- Centre for Education in Environmental
Sustainability, The Hong Kong Institute of Education, 10 Lo Ping Road, Tai Po Hong Kong SAR, China
| | - Michael H. W. Lam
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Ave., Hong
Kong SAR, China
| | - Wai-Yeung Wong
- Department
of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon
Tong, Hong Kong SAR, China
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19
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Luminescence recognition of different organophosphorus pesticides by the luminescent Eu(III)–pyridine-2,6-dicarboxylic acid probe. Anal Chim Acta 2013; 759:81-91. [DOI: 10.1016/j.aca.2012.10.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2011] [Revised: 10/07/2012] [Accepted: 10/24/2012] [Indexed: 11/22/2022]
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20
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Disposable amperometric biosensor for the determination of tyramine using plasma amino oxidase. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0926-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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21
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Azab H, El-Korashy S, Anwar Z, Khairy G, Duerkop A. Reactivity of a luminescent “off–on” pyrylium dye toward various classes of amines and its use in a fluorescence sensor microtiter plate for environmental samples. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.05.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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