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Konziw S, Tunakhun P, Ngernpimai S, Srichaiyapol O, Boonsiri P, Tippayawat P, Techasen A, Maraming P, Choowongkomon K, Daduang S, Promdee L, Daduang J. Development in competitive immunoassay of a point-of-care testing for cotinine (COT) detection in urine. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:4387-4394. [PMID: 38899527 DOI: 10.1039/d4ay00518j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
We present a sensitive and selective lateral flow immunoassay (LFIA) for cotinine (COT), the primary metabolite of nicotine. COT is widely recognized as a superior biomarker to evaluate tobacco smoke exposure. The LFIA uses a competitive assay format where the COT-BSA capture competes with the target COT in urine samples for binding to the monoclonal antibody against COT (mAb-COT) conjugated with gold nanoparticles (mAb-COT-AuNPs). To improve the sensitivity and selectivity of the LFIA-COT, we focused on optimizing the diameter of AuNPs, the conjugation of mAb-COT, and the concentration of the COT-BSA capture. Our findings reveal that the utilization of 40 nm AuNPs in conjugation with a concentration of 4 mg mL-1 of mAb-COT demonstrated significantly greater efficacy compared to LFAs utilizing 20 nm AuNPs. Under the optimal conditions, the LFIA-COT demonstrated sensitive detection of COT at a level of 150 ng mL-1 within 15 min, as observed by the naked eye. It possesses a linear range of 25 to 200 ng mL-1 of COT, with the limit of detection (LOD) of 11.94 ng mL-1 in human urine samples when the color intensity is analyzed using ImageJ software. Our LFIA described here is simple and requires less time for COT detection. It can be used for the rapid and quantitative detection of COT in urine samples in clinical settings.
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Affiliation(s)
- Suthinee Konziw
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Paweena Tunakhun
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
- Biomedical Sciences, Graduate School, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Sawinee Ngernpimai
- Centre for Innovation and Standard for MT and PT (CISMaP), Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Oranee Srichaiyapol
- Centre for Innovation and Standard for MT and PT (CISMaP), Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Patcharee Boonsiri
- Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Patcharaporn Tippayawat
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
- Department of Medical Technology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Anchalee Techasen
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Pornsuda Maraming
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Kiattawee Choowongkomon
- Department of Biochemistry, Faculty of Science, Kasetsart University, Phahonyothin Road, Chatuchak, Bangkok, 10900, Thailand
| | - Sakda Daduang
- Division of Pharmacognosy and Toxicology, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Limthong Promdee
- Department of Medical Technology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Jureerut Daduang
- Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences (CMDL), Khon Kaen University, Khon Kaen, 40002, Thailand
- Department of Medical Technology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
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Axente RE, Stan M, Chitescu CL, Nitescu VG, Vlasceanu AM, Baconi DL. Application of Ionic Liquids as Mobile Phase Additives for Simultaneous Analysis of Nicotine and Its Metabolite Cotinine in Human Plasma by HPLC-DAD. Molecules 2023; 28:molecules28041563. [PMID: 36838551 PMCID: PMC9960693 DOI: 10.3390/molecules28041563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 01/30/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Nicotine and cotinine are very polar basic molecules, which makes it difficult to analyze them by reversed-phase liquid chromatography (RPLC), especially in biological samples. Additives with an ionic character have been traditionally used in RPLC as silanol suppressors. The aim of our study was to investigate the potential of selected ionic liquids in improving chromatographic performance in comparison with common additives. The experimental design was conducted using the following ionic liquids as the mobile phase modifiers: 1-butyl-3-methylimidazolium tetrafluoroborate, BMIM[BF4] and 1-butyl-3-methylimidazolium hexafluorophosphate BMIM[PF6], with a C18 chromatographic column. The separation of these alkaloids on silica-based RPLC stationary phases was successfully conducted by the addition of BMIM[BF4] in an acetonitrile:phosphate-buffer-based mobile phase in a pH range of 2.3-5.2. The presented chromatographic method can be used as alternative for monitoring studies or pharmacokinetic application necessary for the evaluation of tobacco smoke exposure.
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Affiliation(s)
- Roxana E. Axente
- Faculty of Medicine and Pharmacy, Dunarea de Jos University of Galati, 800010 Galati, Romania
| | - Miriana Stan
- Department of Toxicology, Carol Davila University of Medicine and Pharmacy, 20021 Bucharest, Romania
- Correspondence:
| | - Carmen L. Chitescu
- Faculty of Medicine and Pharmacy, Dunarea de Jos University of Galati, 800010 Galati, Romania
| | - Viorela G. Nitescu
- Ward ATI—Toxicology, Pediatric Clinic 2, Emergency Clinical Hospital for Children Grigore Alexandrescu, 011743 Bucharest, Romania
| | - Ana-Maria Vlasceanu
- Department of Toxicology, Carol Davila University of Medicine and Pharmacy, 20021 Bucharest, Romania
| | - Daniela L. Baconi
- Department of Toxicology, Carol Davila University of Medicine and Pharmacy, 20021 Bucharest, Romania
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Influence of Selective Extraction/Isolation of Heme/Hemoglobin with Hydrophobic Imidazolium Ionic Liquids on the Precision and Accuracy of Cotinine ELISA Test. Int J Mol Sci 2022; 23:ijms232213692. [PMID: 36430168 PMCID: PMC9691248 DOI: 10.3390/ijms232213692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/02/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
In this study, ionic liquids were used for the selective extraction/isolation of hemoglobin from human serum for cotinine determination using the ELISA Kit. The suitability of hydrophobic imidazolium-based ionic liquids was tested, of which OMIM BF4 (1-methyl-3-octylimidazolium tetrafluoroborate) turned out to be the most suitable for direct extraction of hemoglobin into an ionic liquid without the use of any additional reagent at one extraction step. Hemoglobin was separated quantitatively (95% recovery) from the remaining types of proteins remaining in the aqueous phase. Quantum mechanical calculations showed that the interaction of the iron atom in the heme group and the nitrogen atom of the ionic liquid cation is responsible for the transfer of hemoglobin whereas molecular dynamics simulations demonstrated that the non-covalent interactions between heme and solvent are more favorable in the case of OMIM BF4 in comparison to water. The opposite trend was found for cotinine. Selective isolation of the heme/hemoglobin improved the ELISA test's accuracy, depending on the cotinine level, from 15% to 30%.
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Alhusban AA, Hammad AM, Alzaghari LF. Simple HPLC method for simultaneous quantification of nicotine and cotinine levels in rat plasma after exposure to two different tobacco products. ACTA CHROMATOGR 2022. [DOI: 10.1556/1326.2022.01054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Purpose
Development and validation of a selective analytical method to accurately and precisely quantify nicotine and cotinine levels in rat's plasma after exposure to tobacco cigarettes and tobacco water-pipe.
Methods
An easy HPLC-Photodiode-Array Detection (PDA) method was developed and validated for simultaneous determination of nicotine and cotinine levels in plasma of 15 rats (10 rats after tobacco products exposure and 5 control rats). Nicotine and cotinine were extracted in one step from plasma using acetonitrile and concentrated to lowest volume using nitrogen stream.
Results
The developed method offered a rapid analysis time of 14 min with single step of analytes extraction from rat's plasma with recovery percentage range between 93 and 95% and excellent linearity with correlation factor more than 0.994 with analytical range between 50 and 1000 ng mL−1 and LOD of 25 ng mL−1 and 23 ng mL−1 for nicotine and cotinine, respectively. The analysis of rat's plasma after 28 days of exposure to tobacco cigarettes and tobacco water-pipe revealed that the average concentrations of 376 ng mL−1 for cotinine and 223 ng mL−1 for nicotine were obtained after tobacco cigarettes exposure, and 220 ng mL−1 for cotinine and 192 ng mL−1 for nicotine after tobacco water-pipe exposure.
Conclusion
Higher nicotine and cotinine levels were found in plasma after tobacco cigarettes exposure than water-pipe exposure which may have potential undesirable effects on passive smokers in both cases.
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Affiliation(s)
- Ala A. Alhusban
- Department of Pharmacy, Faculty of Pharmacy, Al-Zaytoonah University of Jordan, Amman, Jordan
| | - Alaa M. Hammad
- Department of Pharmacy, Faculty of Pharmacy, Al-Zaytoonah University of Jordan, Amman, Jordan
| | - Lujain F. Alzaghari
- Department of Pharmacy, Faculty of Pharmacy, Al-Zaytoonah University of Jordan, Amman, Jordan
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Guo Y, Mao R, Zhang Y, Li R, Oduro PK, Si D, Han L, Huang Y, Pan G. An integrated strategy for the systematic chemical characterization of Salvianolate lyophilized injection using four scan modes based on the ultra-high performance liquid chromatography-triple quadrupole-linear ion trap mass spectrometry. J Pharm Biomed Anal 2022; 215:114769. [DOI: 10.1016/j.jpba.2022.114769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/23/2022] [Accepted: 04/12/2022] [Indexed: 10/18/2022]
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