1
|
Zhang N, Gao Y, Sheng K, Xu X, Jing W, Bao T, Wang S. Ferric iron loaded porphyrinic zirconium MOFs on corncob for the enhancement of diuretics extraction. CHEMOSPHERE 2022; 301:134694. [PMID: 35472611 DOI: 10.1016/j.chemosphere.2022.134694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 04/12/2022] [Accepted: 04/20/2022] [Indexed: 06/14/2023]
Abstract
Herein, corncob waste was used as a scaffold for the fabrication of effective adsorbents. Porphyrinic zirconium metal-organic frameworks (MOFs) PCN-223 and PCN-224 constructed by different numbers of Zr6 cluster nodes were grown on the surface of the corncob. Fe (Ш) ions were implanted in the porphyrin ring by post-synthesis modification. The results showed that the extraction capacity of diuretics on PCN-224@corncob containing suitable pore size was larger than that of PCN-223@corncob. The adsorption of diuretics was further enhanced because of the electrostatic effect caused by implantation of Fe (Ш) ions. PCN-224-Fe@corncob was recyclable and selective for the extraction of furosemide (Fur) and bumetanide (Bum). Coupled in-syringe solid phase extraction (IS-SPE) with ultra-performance liquid chromatography (UPLC), an efficient, sensitive, and stable method was established. With a sensitivity between 0.6 and 1.0 μg/L and a recovery between 83.2% and 119.2%, it is used for the analysis of trace amounts of Fur and Bum in weight loss products and environmental water. The functionalized corncob has potential application for the adsorption of diuretics, and the metal ions implantation in MOFs provides a promising strategy for enhancing extraction capacity.
Collapse
Affiliation(s)
- Nan Zhang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China
| | - Yan Gao
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China
| | - Kangjia Sheng
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China
| | - Xianliang Xu
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China
| | - Wanghui Jing
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Macao, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China
| | - Tao Bao
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Macao, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China.
| | - Sicen Wang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China; Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Macao, China; Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an, 710061, China.
| |
Collapse
|
2
|
Suquila FAC, Tarley CRT. Performance of restricted access copper-imprinted poly(allylthiourea) in an on-line preconcentration and sample clean-up FIA-FAAS system for copper determination in milk samples. Talanta 2019; 202:460-468. [DOI: 10.1016/j.talanta.2019.05.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 05/01/2019] [Accepted: 05/03/2019] [Indexed: 01/31/2023]
|
3
|
Naguib IA, Abdelaleem EA, Emam AA, Ali NW, Abdallah FF. Development and validation of HPTLC and green HPLC methods for determination of furosemide, spironolactone and canrenone, in pure forms, tablets and spiked human plasma. Biomed Chromatogr 2018; 32:e4304. [PMID: 29855049 DOI: 10.1002/bmc.4304] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 05/17/2018] [Accepted: 05/23/2018] [Indexed: 01/23/2023]
Abstract
Two selective and accurate chromatographic methods are presented for simultaneous quantitation of spironolactone (SP) and furosemide (FR) and canrenone (CN), the main degradation product and the main active metabolite of SP. Method A was HPTLC, where separation was completed on silica gel HPTLC F254 plates using ethyl acetate-triethylamine-acetic acid (9:0.7:0.5, by volume) as a developing system and UV detection at 254 nm. Method B was a green isocratic RP-HPLC utilizing a C18 (4.6 × 100 mm) column, the mobile phase consisting of ethanol-deionized water (45: 55, v/v) and UV estimation at 254 nm. Adjustment of flow rate at 1 mL/min and pH at 3.5 with glacial acetic acid was done. Regarding the greenness profile, the proposed RP-HPLC method is greener than the reported one. ICH guidelines were followed to validate the developed methods. Successful applications of the developed methods were revealed by simultaneous determination of FR, SP and CN in pure forms and plasma samples in the ranges of 0.2-2, 0.05-2.6 and 0.05-2 μg/band for method A and 5-60, 2-60 and 2-60 μg/mL for method B for FR, SP and CN, respectively.
Collapse
Affiliation(s)
- Ibrahim A Naguib
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Eglal A Abdelaleem
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Aml A Emam
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Nouruddin W Ali
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Fatma F Abdallah
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| |
Collapse
|
4
|
Emam AA, Abdelaleem EA, Naguib IA, Abdallah FF, Ali NW. Successive ratio subtraction as a novel manipulation of ratio spectra for quantitative determination of a mixture of furosemide, spironolactone and canrenone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 192:427-436. [PMID: 29202387 DOI: 10.1016/j.saa.2017.11.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 10/14/2017] [Accepted: 11/14/2017] [Indexed: 06/07/2023]
Abstract
Furosemide and spironolactone are commonly prescribed antihypertensive drugs. Canrenone is the main degradation product and main metabolite of spironolactone. Ratio subtraction and extended ratio subtraction spectrophotometric methods were previously applied for quantitation of only binary mixtures. An extension of the above mentioned methods; successive ratio subtraction, is introduced in the presented work for quantitative determination of ternary mixtures exemplified by furosemide, spironolactone and canrenone. Manipulating the ratio spectra of the ternary mixture allowed their determination at 273.6nm, 285nm and 240nm and in the concentration ranges of (2-16μgmL-1), (4-32μgmL-1) and (1-18μgmL-1) for furosemide, spironolactone and canrenone, respectively. Method specificity was ensured by the application to laboratory prepared mixtures. The introduced method was ensured to be accurate and precise. Validation of the developed method was done with respect to ICH guidelines and its validity was further ensured by the application to the pharmaceutical formulation. Statistical comparison between the obtained results and those obtained from the reported HPLC method was achieved concerning student's t-test and F ratio test where no significant difference was observed.
Collapse
Affiliation(s)
- Aml A Emam
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt
| | - Eglal A Abdelaleem
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt
| | - Ibrahim A Naguib
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt
| | - Fatma F Abdallah
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt.
| | - Nouruddin W Ali
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt
| |
Collapse
|
5
|
Ling J, Yu Y, Feng J, Xu C, Jiang J, Wang L, Long J, Li Y, Duan G. Restricted access magnetic core-mesoporous shell microspheres with C8-modified interior pore walls for the identification of 20( S )-protopanaxadiol metabolites in rat plasma using UPLC-Q-TOF-MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1054:73-79. [DOI: 10.1016/j.jchromb.2017.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Revised: 02/19/2017] [Accepted: 04/01/2017] [Indexed: 02/07/2023]
|
6
|
de Faria HD, Abrão LCDC, Santos MG, Barbosa AF, Figueiredo EC. New advances in restricted access materials for sample preparation: A review. Anal Chim Acta 2017; 959:43-65. [DOI: 10.1016/j.aca.2016.12.047] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 12/28/2016] [Accepted: 12/30/2016] [Indexed: 11/27/2022]
|
7
|
Magnetic field assisted μ-solid phase extraction of anti-inflammatory and loop diuretic drugs by modified polybutylene terephthalate nanofibers. Anal Chim Acta 2016; 934:88-97. [DOI: 10.1016/j.aca.2016.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 06/01/2016] [Accepted: 06/02/2016] [Indexed: 11/24/2022]
|
8
|
Development and validation of a rapid HPLC method for the determination of cefdinir in beagle dog plasma integrated with an automatic on-line solid-phase extraction following protein precipitation in the 96-well plate format. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 895-896:83-8. [DOI: 10.1016/j.jchromb.2012.03.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 03/05/2012] [Accepted: 03/10/2012] [Indexed: 11/30/2022]
|
9
|
The interaction between furosemide-palladium (II) chelate and basic triphenylmethane dyes by resonance Rayleigh scattering spectra and resonance non-linear scattering spectra and their analytical applications. Sci China Chem 2010. [DOI: 10.1007/s11426-010-3176-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
10
|
Computer aided-molecular design and synthesis of a high selective molecularly imprinted polymer for solid-phase extraction of furosemide from human plasma. Anal Chim Acta 2010; 658:225-32. [DOI: 10.1016/j.aca.2009.11.019] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2009] [Revised: 11/03/2009] [Accepted: 11/09/2009] [Indexed: 11/23/2022]
|
11
|
Recent developments in analytical determination of furosemide. J Pharm Biomed Anal 2008; 48:519-32. [DOI: 10.1016/j.jpba.2008.07.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 07/01/2008] [Accepted: 07/02/2008] [Indexed: 11/23/2022]
|
12
|
Llorent-Martínez EJ, Domínguez-Vidal A, Ortega-Barrales P, Molina-Díaz A. Fast Determination of Salicylic Acid in Pharmaceuticals by Using a Terbium-Sensitized Luminescent SIA Optosensor. J Pharm Sci 2008; 97:791-7. [PMID: 17876766 DOI: 10.1002/jps.21013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this article, we report the coupling of sequential injection analysis (SIA) and solid phase lanthanide-sensitized luminescence as a detection technique; in this technique, the energy absorbed by the analyte (retained on a solid support) is transferred to the lanthanide ion, which finally emits the luminescence signal. By using this automatic system, the determination of salicylic acid (SA) is easily, rapidly, and selectively achieved. Microspheres of commercial solid support, Sephadex-QAE A-25, are used to fill the flow-through cell and retain analyte and terbium ions; after the signal from SA-terbium complex is obtained, the solid support is easily regenerated by using an ethylenediaminetetraacetic acid disodium salt 2-hydrate (EDTA) solution. Over 200 determinations can be carried out without replacing the resin microbeads. The proposed method shows a 0.045 microg mL(-1) detection limit, with an R.S.D. lower than 3% and a sampling frequency up to 30 samples per hour. The system has been applied to the determination of SA in pharmaceuticals obtained from the Spanish Pharmacopoeia, with satisfactory results; an additional recovery study has been carried out with recoveries close to 100%.
Collapse
Affiliation(s)
- E J Llorent-Martínez
- Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Paraje Las Lagunillas, E-23071 Jaén, Spain
| | | | | | | |
Collapse
|
13
|
Chocholous P, Solich P, Satínský D. An overview of sequential injection chromatography. Anal Chim Acta 2007; 600:129-35. [PMID: 17903474 DOI: 10.1016/j.aca.2007.02.018] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2006] [Revised: 01/05/2007] [Accepted: 02/08/2007] [Indexed: 11/23/2022]
Abstract
New generation of sequential injection analysis (SIA) called sequential injection chromatography (SIC) has already been consolidated as a good alternative of high performance liquid chromatography (HPLC) for fast analysis of simple samples. Benefits of flow methods are automation, miniaturization and low sample and mobile phase consumption. Implementation of short monolithic chromatographic column into SIA opens new area-on-line chromatographic separation of multi-compound sample in low-pressure flow system, with the advantage of flow programming and possibility of sample manipulation. In the presented review the potential of SIC and its comparison with HPLC for determination of pharmaceutical mixtures is discussed and outlines past and recent trends focused on separation with SIC.
Collapse
Affiliation(s)
- Petr Chocholous
- Department of Analytical Chemistry, Faculty of Pharmacy, Charles University, Heyrovského 1203, Hradec Králové 500 05, Czech Republic
| | | | | |
Collapse
|
14
|
Sadílek P, Šatínský D, Solich P. Using restricted-access materials and column switching in high-performance liquid chromatography for direct analysis of biologically-active compounds in complex matrices. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.02.002] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Wille SMR, Lambert WEE. Recent developments in extraction procedures relevant to analytical toxicology. Anal Bioanal Chem 2007; 388:1381-91. [PMID: 17468854 DOI: 10.1007/s00216-007-1294-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Revised: 04/03/2007] [Accepted: 04/04/2007] [Indexed: 10/23/2022]
Abstract
Sample preparation is an important step in the development of an analytical method but is often regarded as time-consuming, laborious work. Optimum sample preparation leads to enhanced selectivity and sensitivity, however, and reduces amounts of interfering matrix compounds, resulting in less signal suppression or enhancement. Recent developments in extraction techniques that could be of interest in clinical and forensic toxicology, for example liquid-liquid, solid-phase, and headspace extraction, are summarized in this review. The advantages and disadvantages of several extraction techniques are discussed, to enable the reader to choose an appropriate method of extraction for his or her application. Attention is paid to current trends in analytical toxicology, for example miniaturization, high throughput, and automation.
Collapse
Affiliation(s)
- Sarah M R Wille
- Laboratory of Toxicology, Ghent University, Harelbekestraat 72, 9000 Gent, Belgium
| | | |
Collapse
|
16
|
Mullett WM. Determination of drugs in biological fluids by direct injection of samples for liquid-chromatographic analysis. ACTA ACUST UNITED AC 2007; 70:263-73. [DOI: 10.1016/j.jbbm.2006.10.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Accepted: 10/05/2006] [Indexed: 10/24/2022]
|
17
|
Theodoridis GA, Zacharis CK, Voulgaropoulos AN. Automated sample treatment by flow techniques prior to liquid-phase separations. ACTA ACUST UNITED AC 2007; 70:243-52. [DOI: 10.1016/j.jbbm.2006.08.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Accepted: 08/24/2006] [Indexed: 10/24/2022]
|
18
|
Fast simultaneous spectrophotometric determination of naphazoline nitrate and methylparaben by sequential injection chromatography. Talanta 2006; 70:408-13. [DOI: 10.1016/j.talanta.2006.02.065] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Revised: 02/23/2006] [Accepted: 02/23/2006] [Indexed: 11/20/2022]
|
19
|
Zacharis CK, Tempels FWA, Theodoridis GA, Voulgaropoulos AN, Underberg WJM, Somsen GW, de Jong GJ. Coupling of sequential injection analysis and capillary electrophoresis - Laser-induced fluorescence via a valve interface for on-line derivatization and analysis of amino acids and peptides. J Chromatogr A 2006; 1132:297-303. [PMID: 16919652 DOI: 10.1016/j.chroma.2006.07.076] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Revised: 07/20/2006] [Accepted: 07/28/2006] [Indexed: 10/24/2022]
Abstract
The on-line coupling of sequential injection analysis (SIA) and capillary electrophoresis (CE) via an in-line injection valve is presented. The SIA system is used for automated derivatization of amino acids and peptides. Dichlorotriazinylaminofluorescein serves as the derivatization agent, thus enabling sensitive laser-induced fluorescence detection of the derivatized analytes. The SIA procedure includes the following steps: (a) introduction of reagent and sample zones in a holding coil, (b) sample and reagent mixing in a reaction coil, (c) stop-flow step for increase of the reaction time, and (d) delivery of derivatized sample into the loop of the micro-valve interface. A small portion of the analyte zone is introduced electrokinetically in the separation capillary via the valve interface and CE analysis is performed. Factors affecting the CE separation, such as pH, the borate and sodium dodecyl sulphate concentration of the background electrolyte have been optimized. The derivatization conditions have been studied to obtain a high reaction yield in a relative short time. The transfer of a part of the reaction plug into the loop of the valve interface has been optimized. Using des-Tyr(1)-[Met]-enkephalinamide as test compound, it is demonstrated that after automated derivatization, on-line electrophoretic analysis could be achieved. Glycine has been selected as the internal standard in order to correct for variations in reaction time and filling of the injection loop. For the enkephalin, good reproducibility (RSD<4.5% calculated by the ratio of the peak areas) and linearity (0.5-5 microg mL(-1), R(2)>or=0.994) are obtained with a detection limit of 30 ng mL(-1) (S/N=3).
Collapse
Affiliation(s)
- Constantinos K Zacharis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University Thessaloniki, 541 24 Thessaloniki, Greece
| | | | | | | | | | | | | |
Collapse
|
20
|
Zacharis CK, Theodoridis GA, Podgornik A, Voulgaropoulos AN. Incorporation of a monolithic column into sequential injection system for drug-protein binding studies. J Chromatogr A 2006; 1121:46-54. [PMID: 16690065 DOI: 10.1016/j.chroma.2006.04.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Revised: 03/27/2006] [Accepted: 04/05/2006] [Indexed: 10/24/2022]
Abstract
A sequential injection analysis (SIA) manifold was incorporated with a monolithic strong anion-exchanger disk for on-line drug-protein interaction studies. The antibiotic ciprofloxacin (CF) was selected as a model drug compound. The separation principle was based on the strong retention of bovine serum albumin (BSA) on the monolithic strong anion-exchanger and the liberation/release of the free form of the drug. Elution of the retained BSA was easily achieved by delivering a different mobile phase via the SIA manifold. The type of functional group of the monolithic support, the breakthrough volume and the injected volumes of CF and BSA were studied and optimized. The influence of the variation of incubation time was studied in on-line binding assays. Scatchard plot was employed to obtain the number of binding sites and the equilibrium binding constants. For the off-line study of the CF-BSA binding, two binding classes were determined with constants of (3.16+/-0.21)x10(6)M(-1) and (1.27+/-0.48)x10(4)M(-1) and 6.1+/-1.3 and 17.8+/-3.9 binding sites per class, respectively. In non-equilibrium binding experiments the binding rate constant was k(1)=785 M(-1)min(-1). All measurements were monitored with fluorescence (lambda(ext)=300 nm, lambda(em)=460 nm) and spectrophotometric detection (lambda=280 nm). To evaluate the accuracy of the developed method the obtained results were compared versus ultrafiltration experiments and were found in good agreement.
Collapse
Affiliation(s)
- Constantinos K Zacharis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University Thessaloniki, 541 24 Thessaloniki, Greece
| | | | | | | |
Collapse
|
21
|
José Ruiz‐Angel M, Berthod A, Carda‐Broch S, Celia García‐Álvarez‐Coque M. Analytical Techniques for Furosemide Determination. SEPARATION AND PURIFICATION REVIEWS 2006. [DOI: 10.1080/15422110600671726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|