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Czajkowska A, Korsak D, Fiedoruk-Pogrebniak M, Koncki R, Strzelak K. Turbidimetric flow analysis system for the investigation of microbial growth. Talanta 2024; 268:125303. [PMID: 37852015 DOI: 10.1016/j.talanta.2023.125303] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/03/2023] [Accepted: 10/07/2023] [Indexed: 10/20/2023]
Abstract
The monitoring of life of microbial populations is of the uttermost importance in environmental and food analysis, agriculture, as well as in medicine. The duration of bacteria adaptation to new environmental conditions, its lifetime and the divisions' pace are the key information in many studies. It was found that the fully-mechanized flow analysis system based on solenoid valves and pumps, paired with a dedicated flow-through optoelectronic detector can be successfully applied for monitoring of bacteria growth. The applicability of the designed multicommutated flow analysis (MCFA) system was proved by analysis of solutions containing bacteria cells proceeded by tests of McFarland (McF) standards. The developed setup allowed modelling and simulation of microbial growth, as well as monitoring of the bacteria growth in real-time manner to be carried out. The monitor is useful for the quantitative estimation of the basic parameters of bacteria population like its size, the rate of bacteria multiplication, as well as the times of lag, log and stationary phases of microbial growth.
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Affiliation(s)
| | - Dorota Korsak
- Faculty of Biology, University of Warsaw, Warsaw, Poland
| | | | - Robert Koncki
- Faculty of Chemistry, University of Warsaw, Warsaw, Poland
| | - Kamil Strzelak
- Faculty of Chemistry, University of Warsaw, Warsaw, Poland.
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2
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Głowacka J, Wiśniewska A, Koncki R, Strzelak K. Photometric flow system for the determination of serum lactate dehydrogenase activity. Talanta 2023; 265:124817. [PMID: 37418958 DOI: 10.1016/j.talanta.2023.124817] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 06/07/2023] [Accepted: 06/12/2023] [Indexed: 07/09/2023]
Abstract
The routine method for LDH (Lactate dehydrogenase) activity determination is to monitor the increase of NADH concentration at 340 nm. There are some inconvenience in taking measurements in the near-UV region, especially in the case of serum samples analysis. In this work, two modifications of the routine LDH activity assay based on the use of reducing properties of NADH have been compared. Both methods involved the reduction of compounds that can be easily determined by well-known methods, ferric ion (with ferrozine) and nitrotetrazolium blue (NBT). A fully-mechanized Multicommutated Flow Analysis-Paired Emitter Detector Diode (MCFA-PEDD) system based on solenoid devices was developed and applied for both methods. The linear ranges obtained for Fe-ferrozine and NBT methods are 6.0-200.0 U L-1 and 10.0-250.0 U L-1 with estimated detection limits at 0.2 U L-1 and 4.5 U L-1, respectively. The low LOQ values enabled 10-fold sample dilutions, which is advantageous for samples with limited available volume. The Fe-ferrozine method is more selective for LDH activity in the presence of glucose, ascorbic acid, albumin, bilirubin, copper and calcium ions than NBT method. To confirm the analytical usefulness of the proposed flow system, the analysis of real human serum samples was carried out. The statistic tests showed satisfactory correlation between the results obtained for both developed methods and those received using the reference method.
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Affiliation(s)
- Justyna Głowacka
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
| | - Agnieszka Wiśniewska
- Medical University of Warsaw, Faculty of Pharmacy, Department of Laboratory Medicine, Banacha 1a, 02-097, Warsaw, Poland
| | - Robert Koncki
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
| | - Kamil Strzelak
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland.
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Sakunrungrit K, Suwanchawalit C, Charoenkitamorn K, Hongwitayakorn A, Strzelak K, Chaneam S. Sequential Injection Analysis for Rapid Determination of Mercury in Skincare Products Based on Fluorescence Quenching of Eco-Friendly Synthesized Carbon Dots. ACS Omega 2023; 8:7615-7625. [PMID: 36872964 PMCID: PMC9979229 DOI: 10.1021/acsomega.2c07175] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
This work reports the analysis of mercury using a spectrofluorometric method combined with a sequential injection analysis (SIA) system. This method is based on the measurement of fluorescence intensity of carbon dots (CDs), which is quenched proportionally after adding mercury ions. Herein, the CDs underwent environmentally friendly synthesis using a microwave-assisted approach that provides intensive and efficient energy and shortens reaction time. After irradiation at 750 W for 5 min in a microwave oven, a dark brown CD solution with a concentration of 2.7 mg mL-1 was obtained. The properties of the CDs were characterized by transmission electron microscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and UV-vis spectrometry. We presented for the first time the use of CDs as a specific reagent for the determination of mercury in skincare products with the SIA system to achieve rapid analysis and full automatic control. The as-prepared CD stock solution was diluted 10 times and used as a reagent in the SIA system. Excitation and emission wavelengths at 360 and 452 nm, respectively, were used to construct a calibration curve. Physical parameters affecting the SIA performance were optimized. In addition, the effect of pH and other ions was investigated. Under the optimum conditions, our method showed a linear range from 0.3 to 600 mg L-1 with an R 2 of 0.99. The limit of detection was 0.1 mg L-1. Relative standard deviation was 1.53% (n = 12) with a high sample throughput of 20 samples per hour. Finally, the accuracy of our method was validated by comparison using inductively coupled plasma mass spectrometry. Acceptable recoveries were also presented without a significant matrix effect. This method was also the first time that uses the untreated CDs for the determination of mercury(II) in skincare products. Therefore, this method could be an alternative for mercuric toxic control in other sample applications.
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Affiliation(s)
- Kanokwan Sakunrungrit
- Department
of Chemistry, Faculty of Science, Silpakorn
University, Nakhon
Pathom 73000, Thailand
| | - Cheewita Suwanchawalit
- Department
of Chemistry, Faculty of Science, Silpakorn
University, Nakhon
Pathom 73000, Thailand
| | - Kanokwan Charoenkitamorn
- Department
of Chemistry, Faculty of Science, Silpakorn
University, Nakhon
Pathom 73000, Thailand
| | - Apisake Hongwitayakorn
- Department
of Computing, Faculty of Science, Silpakorn
University, Nakhon
Pathom 73000, Thailand
| | - Kamil Strzelak
- University
of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093 Warsaw, Poland
| | - Sumonmarn Chaneam
- Department
of Chemistry, Faculty of Science, Silpakorn
University, Nakhon
Pathom 73000, Thailand
- Flow
Innovation Research for Science and Technology Laboratories (FIRST
Labs), Bangkok 10400, Thailand
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4
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Głowacka J, Koncki R, Strzelak K. Multicommutation flow analysis system for non-enzymatic lactate determination based on light-driven photometric assay. Anal Chim Acta 2022; 1210:339878. [DOI: 10.1016/j.aca.2022.339878] [Citation(s) in RCA: 1] [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] [Received: 01/19/2022] [Revised: 03/28/2022] [Accepted: 04/23/2022] [Indexed: 11/26/2022]
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Głowacka J, Strzelak K, Koncki R. Multicommutated Flow Analysis System for Determination of Horseradish Peroxidase and Its Inhibitors. Molecules 2021; 26:molecules26185630. [PMID: 34577101 PMCID: PMC8465280 DOI: 10.3390/molecules26185630] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 09/08/2021] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
A fully mechanized multicommutated flow analysis (MCFA) system dedicated to determining horseradish peroxidase (HRP) activity was developed. Detection was conducted using a flow-through optoelectronic detector-constructed of paired LEDs operating according to the paired emitter-detector diode (PEDD) principle. The PEDD-MCFA system is dedicated to monitoring the enzyme-catalyzed oxidation of p-phenylenediamine (pPD) by a hydrogen peroxide. Under optimized conditions, the presented bioanalytical system was characterized by a linear response range (33.47-200 U/L) with a detection limit at 10.54 U/L HRP activity and 1.66 mV·L/U sensitivity, relatively high throughput (12 signals recordings per hour), and acceptable precision (RSD below 6%). Additionally, the utility of the developed PEDD-MCFA system for the determination of HRP inhibitors allowing the detection of selected thiols at micromolar levels, is demonstrated. The practical utility of the flow system was illustrated by the analysis of some dietary supplements containing L-cysteine, N-acetylcysteine, and L-glutathione.
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Strzelak K, Czajkowska A, Koncki R. The comparison between light-scattering detectors based on LED and photodiode for immunoprecipitation assays of transferrin and ferritin. Anal Chim Acta 2021; 1175:338753. [PMID: 34330448 DOI: 10.1016/j.aca.2021.338753] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 05/12/2021] [Accepted: 06/10/2021] [Indexed: 12/15/2022]
Abstract
Undoubtedly, light-emitting diodes (LEDs) and photodiodes (PDs) are indispensable optoelectronic devices in modern analytical chemistry. LEDs can serve as either light emitters or detectors, thus being an alternative to the most popular detection systems consisted of PD. In this contribution, a comparison between LED-LED and LED-PD detectors, operating in turbidimetric and nephelometric modes, has been carried out for immunoprecipitation detection of transferrin and ferritin. The greatest emphasis was placed on the study of detectors responses under different measurement conditions including current powering an emitter, amplification gain in the case of PD as detector or the construction of detection cells designed for the Multicommutated Flow Analysis (MCFA). The assumption was to obtain the fully-mechanized system with simple but efficient detection system to enable the determination of iron-binding proteins occurring at different concentration ranges in human body. As a result, the optimized arrangements of LED-LED and LED-PD setups were characterized by similar analytical characteristics, enabling the determination of transferrin with the detection limit (LOD) of 0.2 mg/L and RSDs of 2.8-4.8% for LED-LED, and LOD of 0.1 mg/L and RSDs of 0.9-3.6% for LED-PD. In the case of ferritin detection, only the response of the LED-PD detector was statistically distinguishable in the range of 130-198 μg/L of protein with recorded analytical signal change of 20 mV value. The addition of polymer for signal enhancement provided the increase of response range to 107-253 μg/L, enabling the developed system for detection of pathological serum ferritin levels.
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Affiliation(s)
- Kamil Strzelak
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland.
| | | | - Robert Koncki
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
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Strzelak K, Głowacka J, Koncki R. Towards mechanized biparametric ceruloplasmin assay. Talanta 2020; 214:120881. [PMID: 32278433 DOI: 10.1016/j.talanta.2020.120881] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/24/2020] [Accepted: 02/26/2020] [Indexed: 11/29/2022]
Abstract
Two analytical strategies for determination of both biocatalytic activity and concentration of ceruloplasmin conditions have been proposed. For this purpose, two constructions of fully-mechanized Multicommutated Flow Analysis (MCFA) systems were designed. The versatility of solenoid pumps and valves arrangement enabled to construct both manifolds using similar flow units, taking into account the different requirements for each method. In the case of ceruloplasmin catalytic activity assay, the kinetic measurements with the use of p-phenylenediamine and hydrogen peroxide were performed. The optimization process was focused on the selection of substrate and oxidizer concentration, incubation time as well as solving the issue of substrate autoxidation. It led to the development of the flow bioanalytical system characterized by following analytical parameters: LOD - 0.07 U mL- 1, LOQ - 0.38 U mL-1, RSD ≤6% with 8 μL consumption of human serum. In turn, for examination of ceruloplasmin concentration, the light-scattering detector was used in MCFA system adapted for immunoprecipitation measurements. In this case, the use of potentiator (polyethylene glycol) turned out to be necessary to obtain satisfactory analytical signals. Such a method allowed to obtain 35 measurements per hour with LOD and LOQ of 0.9 mg L-1 and 3.2 mg L-1, respectively. The usefulness of both MCFA systems was successfully examined by performing analyses of real human serum samples.
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Affiliation(s)
- Kamil Strzelak
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland.
| | - Justyna Głowacka
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
| | - Robert Koncki
- University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
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8
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Strzelak K, Koncki R. A remote-controlled immunochemical system for nephelometric detection of human serum transferrin. Biosens Bioelectron 2019; 127:31-37. [DOI: 10.1016/j.bios.2018.12.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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9
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Inpota P, Strzelak K, Koncki R, Sripumkhai W, Jeamsaksiri W, Ratanawimarnwong N, Wilairat P, Choengchan N, Chantiwas R, Nacapricha D. Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water. ANAL SCI 2018; 34:161-167. [PMID: 29434101 DOI: 10.2116/analsci.34.161] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO3- and I-) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine. On-line conversion efficiency of iodate to iodide using the microfluidic device was investigated. Excellent conversion efficiency of 93 - 103% (%RSD = 1.6 - 11%) was obtained. Inorganic iodine concentrations in drinking water samples were measured, and the results obtained were in good agreement with those obtained by an ICP-MS method. Spiked sample recoveries were in the range of 86%(±5) - 128%(±8) (n = 12). Interference of various anions and cations were investigated with tolerance limit concentrations ranging from 10-6 to 2.5 M depending on the type of ions. The developed method is simple and convenient, and it is a green method for iodine analysis, as it greatly reduces the amount of toxic reagent consumed with reagent volumes in the microfluidic scale.
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Affiliation(s)
- Prawpan Inpota
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University.,Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.)
| | | | | | | | | | - Nuanlaor Ratanawimarnwong
- Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.).,Department of Chemistry, Faculty of Science, Srinakharinwirot University
| | - Prapin Wilairat
- Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.).,National Doping Control Centre, Mahidol University
| | - Nathawut Choengchan
- Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.).,Department of Chemistry and the Applied Analytical Chemistry Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
| | - Rattikan Chantiwas
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University.,Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.)
| | - Duangjai Nacapricha
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University.,Flow Innovation Research for Science and Technology Laboratories (FIRST Labs.)
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Strzelak K, Rybkowska N, Wiśniewska A, Koncki R. Photometric flow analysis system for biomedical investigations of iron/transferrin speciation in human serum. Anal Chim Acta 2017; 995:43-51. [PMID: 29126480 DOI: 10.1016/j.aca.2017.10.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/11/2017] [Accepted: 10/17/2017] [Indexed: 01/28/2023]
Abstract
The Multicommutated Flow Analysis (MCFA) system for the estimation of clinical iron parameters: Serum Iron (SI), Unsaturated Iron Binding Capacity (UIBC) and Total Iron Binding Capacity (TIBC) has been proposed. The developed MCFA system based on simple photometric detection of iron with chromogenic agent (ferrozine) enables a speciation of transferrin (determination of free and Fe-bound protein) in human serum. The construction of manifold was adapted to the requirements of measurements under changing conditions. In the course of studies, a different effect of proteins on SI and UIBC determination has been proven. That was in turn the reason to perform two kinds of calibration methods. For measurements in acidic medium for SI/holotransferrin determination, the calibration curve method was applied, characterized by limit of determination and limit of quantitation on the level of 3.4 μmol L-1 and 9.1 μmol L-1, respectively. The determination method for UIBC parameter (related to apotransferrin level) in physiological medium of pH 7.4 forced the use of standard addition method due to the strong influence of proteins on obtaining analytical signals. These two different methodologies, performed in the presented system, enabled the estimation of all three clinical iron/transferrin parameters in human serum samples. TIBC corresponding to total transferrin level was calculated as a sum of SI and UIBC.
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Affiliation(s)
- Kamil Strzelak
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland.
| | - Natalia Rybkowska
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland
| | - Agnieszka Wiśniewska
- Medical University of Warsaw, Faculty of Health Sciences, Department of Laboratory Diagnostics, Banacha 1a, 02-097 Warsaw, Poland
| | - Robert Koncki
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland
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11
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Rybkowska N, Koncki R, Strzelak K. Optoelectronic iron detectors for pharmaceutical flow analysis. J Pharm Biomed Anal 2017; 145:504-508. [PMID: 28746909 DOI: 10.1016/j.jpba.2017.06.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 06/22/2017] [Accepted: 06/25/2017] [Indexed: 11/29/2022]
Abstract
Compact flow-through optoelectronic detectors fabricated by pairing of light emitting diodes have been applied for development of economic flow analysis systems dedicated for iron ions determination. Three analytical methods with different chromogens selectively recognizing iron ions have been compared. Ferrozine and ferene S based methods offer higher sensitivity and slightly lower detection limits than method with 1,10-phenantroline, but narrower ranges of linear response. Each system allows detection of iron in micromolar range of concentration with comparable sample throughput (20 injections per hour). The developed flow analysis systems have been successfully applied for determination of iron in diet supplements. The utility of developed analytical systems for iron release studies from drug formulations has also been demonstrated.
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Affiliation(s)
- Natalia Rybkowska
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093, Warsaw, Poland.
| | - Robert Koncki
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
| | - Kamil Strzelak
- University of Warsaw, Department of Chemistry, Pasteura 1, 02-093, Warsaw, Poland
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Strzelak K, Misztal J, Tymecki Ł, Koncki R. Bianalyte multicommutated flow analysis system for microproteinuria diagnostics. Talanta 2016; 148:707-11. [DOI: 10.1016/j.talanta.2015.04.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 03/24/2015] [Accepted: 04/04/2015] [Indexed: 01/27/2023]
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13
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Abstract
In this contribution, a multicommutated flow analysis (MCFA) system for immunoprecipitation assays is presented.
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Affiliation(s)
- Kamil Strzelak
- University of Warsaw
- Department of Chemistry
- 02-093 Warsaw
- Poland
- University of Warsaw
| | - Robert Koncki
- University of Warsaw
- Department of Chemistry
- 02-093 Warsaw
- Poland
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14
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Strzelak K, Wiśniewska A, Bobilewicz D, Koncki R. Multicommutated flow analysis system for determination of total protein in cerebrospinal fluid. Talanta 2014; 128:38-43. [DOI: 10.1016/j.talanta.2014.04.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 04/07/2014] [Accepted: 04/15/2014] [Indexed: 11/24/2022]
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Tymecki Ł, Strzelak K, Koncki R. Biparametric multicommutated flow analysis system for determination of human serum phosphoesterase activity. Anal Chim Acta 2013; 797:57-63. [DOI: 10.1016/j.aca.2013.08.047] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 07/21/2013] [Accepted: 08/28/2013] [Indexed: 11/24/2022]
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Tymecki Ł, Korszun J, Strzelak K, Koncki R. Multicommutated flow analysis system for determination of creatinine in physiological fluids by Jaffe method. Anal Chim Acta 2013; 787:118-25. [DOI: 10.1016/j.aca.2013.05.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 05/22/2013] [Accepted: 05/30/2013] [Indexed: 12/14/2022]
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17
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Strzelak K, Koncki R, Tymecki Ł. Serum alkaline phosphatase assay with paired emitter detector diode. Talanta 2012; 96:127-31. [DOI: 10.1016/j.talanta.2012.01.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 12/18/2011] [Accepted: 01/14/2012] [Indexed: 11/17/2022]
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Tymecki Ł, Rejnis M, Pokrzywnicka M, Strzelak K, Koncki R. Fluorimetric detector and sensor for flow analysis made of light emitting diodes. Anal Chim Acta 2012; 721:92-6. [DOI: 10.1016/j.aca.2012.01.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 01/12/2012] [Accepted: 01/16/2012] [Indexed: 11/25/2022]
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Tymecki Ł, Strzelak K, Koncki R. A single standard calibration module for flow analysis systems based on solenoid microdevices. Talanta 2009; 79:205-10. [DOI: 10.1016/j.talanta.2009.03.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 03/06/2009] [Accepted: 03/12/2009] [Indexed: 10/21/2022]
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