1
|
Raabová H, Erben J, Chvojka J, Solich P, Švec F, Šatínský D. The role of pKa, log P of analytes, and protein matrix in solid-phase extraction using native and coated nanofibrous and microfibrous polymers prepared via meltblowing and combined meltblowing/electrospinning technologies. Talanta 2021; 232:122470. [PMID: 34074440 DOI: 10.1016/j.talanta.2021.122470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 10/21/2022]
Abstract
Effect of physicochemical properties including dissociation constant (pKa) and partition coefficient (log P) of the compounds on their extraction efficiency in sample preparation using fibrous polymer sorbents has been demonstrated. Poly-ε-caprolactone as meltblown/electrospun composite fibers, and polypropylene, polyethylene, poly(3-hydroxybutyrate), poly(lactic acid), and polyamide 6 in the meltblown fiber format were used as sorbents in solid-phase extraction. In addition, the polycaprolactone fibers were coated with dopamine, dopamine combined with heparin, and tannin, respectively, to modify their extraction properties. These fibers that were not yet used for extractions and the unique combination of sorbents and analytes significantly extends the scope of nanofibrous extraction. The extraction efficiency was determined using model pharmaceuticals including acetylsalicylic acid, moxonidine, metoprolol, propranolol, propafenone, diltiazem, atorvastatin, and amiodarone. These model compounds displayed the widest differences in both pKa and log P values. The extraction efficiency of some of the fibers reached 96.64%. Coating of polycaprolactone fibers with dopamine significantly improved extraction efficiency of slightly retained metoprolol while moxonidine was not retained on any sorbent. The fibrous sorbents were also tested for extraction of pharmaceuticals in bovine serum albumin and human serum, respectively, to demonstrate their capability to extract them from a complex protein-containing matrix. The clean-up efficiency of our fibers was compared with that of a commercial restricted access media (RAM) C-18 alkyl-diol silica column. Our technique is in accordance with the requirements of modern sample preparation techniques.
Collapse
Affiliation(s)
- Hedvika Raabová
- Charles University, Faculty of Pharmacy in Hradec Králové, Department of Analytical Chemistry, Akademika Heyrovského 1203, 50005, Hradec Králové, Czech Republic
| | - Jakub Erben
- The Technical University of Liberec, Faculty of Textile Engineering, Department of Nonwovens and Nanofibrous Materials, Studentská 1402/2, 46001, Liberec 1, Czech Republic
| | - Jiří Chvojka
- The Technical University of Liberec, Faculty of Textile Engineering, Department of Nonwovens and Nanofibrous Materials, Studentská 1402/2, 46001, Liberec 1, Czech Republic
| | - Petr Solich
- Charles University, Faculty of Pharmacy in Hradec Králové, Department of Analytical Chemistry, Akademika Heyrovského 1203, 50005, Hradec Králové, Czech Republic
| | - František Švec
- Charles University, Faculty of Pharmacy in Hradec Králové, Department of Analytical Chemistry, Akademika Heyrovského 1203, 50005, Hradec Králové, Czech Republic
| | - Dalibor Šatínský
- Charles University, Faculty of Pharmacy in Hradec Králové, Department of Analytical Chemistry, Akademika Heyrovského 1203, 50005, Hradec Králové, Czech Republic.
| |
Collapse
|
2
|
Song X, Yang Y, Liang N, Yang F, Chen S, Zhou L, Zhou K, Wang Y. Quantitative pharmacokinetic evaluation of Subtilisin QK-2 after a bolus IV injection in a rat model using a novel sandwich enzyme-linked immunosorbent assay. J Pharm Biomed Anal 2020; 186:113264. [PMID: 32276207 DOI: 10.1016/j.jpba.2020.113264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 03/03/2020] [Accepted: 03/16/2020] [Indexed: 11/29/2022]
Abstract
Intravascular thrombosis is a main cause of multiple cardiovascular diseases. A high thrombolytic activity of the microbial fibrinolytic enzyme Subtilisin QK-2, which is highly homologous to Nattokinase, shows great exploitable potential in thrombolytic therapy. However, the lack of a sensitive detection method limits the further analysis of Subtilisin QK-2 in vivo. We prepared a polyclonal antibody and four monoclonal antibodies (IgG1, titers of 1:500,000) to establish a sensitive sandwich ELISA for Subtilisin QK-2 detection. The limit of detection (LOD) of this ELISA was 1.160 ng/mL. The linear range of the standard curve was 1.96-250 ng/mL (R2 = 0.9912). The cut-off value was 0.236. Subsequently, a pharmacokinetic dose (IV bolus) was administered and analyzed with the established ELISA. The concentration-time profiles were best fitted to a two-compartment model. T1/2α values for doses of 2 mg/kg, 4 mg/kg, and 8 mg/kg were 29.90 ± 10.02 min, 27.17 ± 1.96 min, and 21.83 ± 9.95 min, and T1/2β values were 144.43 ± 49.73 min, 173.46 ± 52.58 min, and 159.49 ± 48.75 min, respectively. Subtilisin QK-2 was eliminated through a mechanism with first-order kinetics. In conclusion, this study provides useful data for further research and clinical applications of Subtilisin QK-2 in the treatment of cardiovascular diseases.
Collapse
Affiliation(s)
- Xia Song
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yuanyuan Yang
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Ning Liang
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Fan Yang
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Song Chen
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Li Zhou
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China; Animal Biosafety Level III Laboratory at the Center for Animal Experiment, Wuhan University School of Medicine, Wuhan 430071, China
| | - Kangping Zhou
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China; Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China.
| | - Yefu Wang
- State Key Laboratory of Virology, Modern Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, China.
| |
Collapse
|
3
|
Chormey DS, Bakırdere S. Principles and Recent Advancements in Microextraction Techniques. FUNDAMENTALS OF QUORUM SENSING, ANALYTICAL METHODS AND APPLICATIONS IN MEMBRANE BIOREACTORS 2018. [DOI: 10.1016/bs.coac.2018.03.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
4
|
Jagadeesan KK, Rossetti C, Abdel Qader A, Reubsaet L, Sellergren B, Laurell T, Ekström S. Filter Plate-Based Screening of MIP SPE Materials for Capture of the Biomarker Pro-Gastrin-Releasing Peptide. SLAS DISCOVERY 2017; 22:1253-1261. [PMID: 28346098 DOI: 10.1177/2472555216689494] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Affinity-based solid-phase extraction (SPE) is an attractive low-cost sample preparation strategy for biomarker analysis. Molecularly imprinted polymers (MIPs) as affinity sorbents offer unique opportunities for affinity SPE, due to their low manufacturing cost and high robustness. A limitation is the prediction of their affinity; therefore, screening of analyte recovery and specificity within a large range of SPE conditions is important in order to ensure high-sensitivity detection and assay reproducibility. Here, a µ-SPE method for screening of the MIP-SPE materials using a commercial 384-well filter plate is presented. The method allows for rapid and automated screening using 10-30 µL of packed SPE sorbent per well and sample volumes in the range of 10-70 µL. This enables screening of many different SPE sorbents while simultaneously identifying optimal SPE conditions. In addition, the 384-well format also facilitates detection with a multitude of analytical platforms. Performance of the µ-MIP-SPE method was investigated using a series of MIPs designed to capture pro-gastrin-releasing peptide (ProGRP). Fractions coming from sample load, cartridge wash, and elution were collected and analyzed using mass spectrometry (MS). The top-performing MIPs were identified, together with proper SPE conditions.
Collapse
Affiliation(s)
| | - Cecilia Rossetti
- 2 Department of Pharmaceutical Chemistry, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Abed Abdel Qader
- 3 Department of Environmental Chemistry and Analytical Chemistry, Institute for Environmental Research (INFU), Technical University of Dortmund, Dortmund, Germany
| | - Léon Reubsaet
- 2 Department of Pharmaceutical Chemistry, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Börje Sellergren
- 4 Department of Biomedical Sciences, Faculty of Health and Society, University of Malmö, Malmö, Sweden
| | - Thomas Laurell
- 1 Department of Biomedical Engineering, Lund University, Lund, Sweden
| | - Simon Ekström
- 1 Department of Biomedical Engineering, Lund University, Lund, Sweden
| |
Collapse
|
5
|
Selective extraction of proteins and other macromolecules from biological samples using molecular imprinted polymers. Bioanalysis 2016; 8:2255-2263. [DOI: 10.4155/bio-2016-0209] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The accurate determination of intact macromolecules in biological samples, such as blood, plasma, serum, urine, tissue and feces is a challenging problem. The increased interest in macromolecules both as candidate drugs and as biomarkers for diagnostic purposes means that new method development approaches are needed. This review charts developments in the use of molecularly imprinted polymers first for small-molecular-mass compounds then for proteins and other macromolecules. Examples of the development of molecularly imprinted polymers for macromolecules are highlighted. The two main application areas to date are sensors and separation science, particularly SPE. Examples include peptides and polypeptides, lysozyme, hemoglobin, ovalbumin, bovine serum albumin and viruses.
Collapse
|
6
|
Multiplexed MALDI-MS arrays for screening of MIP solid phase extraction materials. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1021:213-220. [DOI: 10.1016/j.jchromb.2015.10.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 10/19/2015] [Accepted: 10/22/2015] [Indexed: 12/21/2022]
|
7
|
Ultrasensitive quantitative LC–MS/MS of an inhibitor of apoptosis protein's antagonist in plasma using protein target affinity extraction. Bioanalysis 2016; 8:265-74. [DOI: 10.4155/bio.15.246] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Background: A target protein-based affinity extraction LC–MS/MS method was developed to enable plasma level determination following ultralow dosing (0.1–3 µg/kg) of an inhibitor of apoptosis proteins molecule. Methodology & results: Affinity extraction (AE) utilizing immobilized target protein BIR2/BIR3 was used to selectively capture the inhibitor of apoptosis proteins molecule from dog plasma and enable removal of background matrix components. Pretreatment of plasma samples using protein precipitation was found to provide an additional sensitivity gain. A LLOQ of 7.8 pM was achieved by combining protein precipitation with AE. The method was used to support an ultralow dose dog toxicity study. Conclusion: AE-LC–MS/MS, utilizing target protein, is a highly sensitive methodology for small molecule quantification with potential for broader applicability.
Collapse
|
8
|
Off-line coupling of multidimensional immunoaffinity chromatography and ion mobility spectrometry: A promising partnership. J Chromatogr A 2015; 1426:110-7. [DOI: 10.1016/j.chroma.2015.11.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 10/22/2015] [Accepted: 11/11/2015] [Indexed: 02/04/2023]
|
9
|
Abstract
Insulin analogues represent a major and growing class of biotherapeutics, and their quantitation is an important focus of commercial and public effort across a number of different fields. As LC-MS has developed, it has become an increasingly practicable and desirable alternative to ligand-binding-based approaches for quantitation of this class of compounds. The sensitivity challenge of measuring trace levels of this large peptide molecule in a protein-containing matrix is considerable; however, different approaches to detection, extraction and separation are described to overcome this challenge, including immunoaffinity capture, SPE and low-flow HPLC. Considerations such as bioanalytical assay acceptance criteria and antidrug antibody effects during drug development are included, alongside descriptions of recent sports doping and clinical applications. Factors affecting the correlation and agreement of MS with biological ligand-binding methods are discussed, with ways to anticipate and appreciate differences between the values derived from each technique. The 'future perspective' section discusses the likely trend towards MS-based analysis for these compounds and the impact of HRMS. A high degree of scientific creativity, combined with science-defined regulatory approaches that define suitable validation criteria, will be needed to meet the demanding requirements for high-throughput analysis of insulin by LC-MS.
Collapse
|
10
|
Magnetic nanoparticles of nitrogen enriched carbon (mnNEC) for analysis of pesticides and metabolites in zebrafish by gas chromatography–mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 915-916:46-51. [DOI: 10.1016/j.jchromb.2012.12.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Revised: 11/24/2012] [Accepted: 12/20/2012] [Indexed: 11/21/2022]
|
11
|
|
12
|
Thomas A, Schänzer W, Delahaut P, Thevis M. Immunoaffinity purification of peptide hormones prior to liquid chromatography–mass spectrometry in doping controls. Methods 2012; 56:230-5. [DOI: 10.1016/j.ymeth.2011.08.009] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 08/10/2011] [Accepted: 08/11/2011] [Indexed: 10/17/2022] Open
|
13
|
Abstract
The importance of sample preparation methods as the first stage in bioanalysis is described. In this article, the sample preparation concept and strategies will be discussed, along with the requirements for good sample preparation. The most widely used sample preparation methods in the pharmaceutical industry are presented; for example, the need for same-day rotation of results from large numbers of biological samples in pharmaceutical industry makes high throughput bioanalysis more essential. In this article, high-throughput sample preparation techniques are presented; examples are given of the extraction and concentration of analytes from biological matrices, including protein precipitation, solid-phase extraction, liquid–liquid extraction and microextraction-related techniques. Finally, the potential role of selective extraction methods, including molecular imprinted phases, is considered.
Collapse
|
14
|
Abstract
Anne-Françoise Aubry is Director of Bioanalytical Sciences at Bristol-Myers Squibb Co., leading a team in developing bioanalytical methods for early development drug candidates in support of toxicology and clinical studies. Her main research interests are high-speed, high-resolution LC and new approaches for LC–MS/MS drug bioanalysis in regulated laboratories. Anne Aubry is on the executive board of the Eastern Analytical Symposium and on the organizing committee of the Applied Pharmaceutical Analysis and Chemical and Pharmaceutical Structure Analysis (Shanghai 2011) conferences. The challenges of developing and running low pg/ml LC–MS/MS bioanalytical assays in a regulated laboratory are reviewed. The practical problems encountered in implementing ultrasensitive assays are less in reaching a suitable sensitivity on the instrument than in implementing procedures to control losses and contamination, eliminate matrix interferences and ensure assay robustness so that the assay can be validated to industry standards. Solutions to these problems can be found in each of the three facets of the bioanalytical assay: the sample preparation, the chromatographic separation and the mass spectrometric detection. The key to developing an ultrasensitive assay is to optimize each of these elements. Progress in MS instrumentation has been essential in our ability to reach the low pg/ml limits.
Collapse
|
15
|
Abstract
Dispersion or spreading of analyte bands is a barrier to achieving high resolution in microfluidic separations. The role of dispersion in separations is reviewed with emphasis on metrics, sources and common principles of analysis. Three sources of dispersion (a) inhomogeneous flow fields, (b) solute wall interactions and (c) force fields normal to channel walls are studied in detail. Microfluidic and nanofluidic applications to capillary electrophoresis, chromatography and field-flow fractionation, that are subject to one or more of these three physical processes under standard, unintentional or novel operating conditions, are discussed.
Collapse
Affiliation(s)
- Subhra Datta
- 201, W 19th Avenue, Mechanical Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Sandip Ghosal
- 2145 Sheridan Road, Mechanical Engineering, Northwestern University, Evanston, IL 60208-3111, USA
| |
Collapse
|
16
|
Recent developments and applications of microextraction techniques in drug analysis. Anal Bioanal Chem 2009; 396:339-64. [DOI: 10.1007/s00216-009-3076-2] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 08/12/2009] [Accepted: 08/17/2009] [Indexed: 10/20/2022]
|
17
|
Pandey J, Chauhan A, Jain RK. Integrative approaches for assessing the ecological sustainability ofin situbioremediation. FEMS Microbiol Rev 2009; 33:324-75. [PMID: 19178567 DOI: 10.1111/j.1574-6976.2008.00133.x] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|
18
|
Zhao S, Li X, Ra Y, Li C, Jiang H, Li J, Qu Z, Zhang S, He F, Wan Y, Feng C, Zheng Z, Shen J. Developing and optimizing an immunoaffinity cleanup technique for determination of quinolones from chicken muscle. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:365-371. [PMID: 19119842 DOI: 10.1021/jf8030524] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An immunoaffinity chromatographic method was developed using an antibody mediated immunosorbent to selectively extract and purify 10 quinolones (marbofloxacin, norfloxacin, ciprofloxacin, lomefloxacin, danofloxacin, enrofloxacin, difloxacin, sarafloxacin, oxolinic acid, and flumequine) in chicken muscle followed by HPLC. The operating conditions of the immunoaffinity chromatography (IAC) column were optimized, and the IAC has been successfully used for the isolation and purification of 10 quinolones from chicken muscle tissue. The optimized immunoaffinity column sample cleanup procedure combined with HPLC coupling to fluorescence detection afforded low limits of detection (0.1 ng g(-1) for danfloxacin and 0.15 ng g(-1) for all other quinolones tested). The method was also applied to determine quinolone residues in commercial muscle samples.
Collapse
Affiliation(s)
- Sijun Zhao
- College of Veterinary Medicine, China Agricultural University, Beijing
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Frawley Cass SM, Reid GE, Tepe JJ. Synthesis of diazo functionalized solid supports and their application towards the enrichment of phosphorylated peptides. Org Biomol Chem 2009; 7:3291-9. [DOI: 10.1039/b906577f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
20
|
Dmitrienko SG, Irkha VV, Apyari VV, Klokova EV, Zolotov YA. Recognition of hydroxybenzoic acids and their esters by molecularly imprinted polymers. MENDELEEV COMMUNICATIONS 2008. [DOI: 10.1016/j.mencom.2008.11.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
21
|
Shan J, Pan C, Zhang J, Niu W. New application of mixed C18-SCX SPE clean-up in gas chromatographic-mass spectrometric determination of six β2-agonist residues in pig's liver. ACTA CHROMATOGR 2008. [DOI: 10.1556/achrom.20.2008.1.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
22
|
Ridgway K, Lalljie SPD, Smith RM. Sample preparation techniques for the determination of trace residues and contaminants in foods. J Chromatogr A 2007; 1153:36-53. [PMID: 17313955 DOI: 10.1016/j.chroma.2007.01.134] [Citation(s) in RCA: 214] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 01/18/2007] [Accepted: 01/25/2007] [Indexed: 11/30/2022]
Abstract
The determination of trace residues and contaminants in complex matrices, such as food, often requires extensive sample extraction and preparation prior to instrumental analysis. Sample preparation is often the bottleneck in analysis and there is a need to minimise the number of steps to reduce both time and sources of error. There is also a move towards more environmentally friendly techniques, which use less solvent and smaller sample sizes. Smaller sample size becomes important when dealing with real life problems, such as consumer complaints and alleged chemical contamination. Optimal sample preparation can reduce analysis time, sources of error, enhance sensitivity and enable unequivocal identification, confirmation and quantification. This review considers all aspects of sample preparation, covering general extraction techniques, such as Soxhlet and pressurised liquid extraction, microextraction techniques such as liquid phase microextraction (LPME) and more selective techniques, such as solid phase extraction (SPE), solid phase microextraction (SPME) and stir bar sorptive extraction (SBSE). The applicability of each technique in food analysis, particularly for the determination of trace organic contaminants in foods is discussed.
Collapse
Affiliation(s)
- Kathy Ridgway
- Safety and Environmental Assurance Centre, Unilever Colworth, Sharnbrook, Bedfordshire, MK44 1LQ, UK.
| | | | | |
Collapse
|
23
|
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
|
24
|
Baggiani C, Baravalle P, Giraudi G, Tozzi C. Molecularly imprinted solid-phase extraction method for the high-performance liquid chromatographic analysis of fungicide pyrimethanil in wine. J Chromatogr A 2007; 1141:158-64. [PMID: 17178127 DOI: 10.1016/j.chroma.2006.12.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2006] [Revised: 10/17/2006] [Accepted: 12/05/2006] [Indexed: 11/26/2022]
Abstract
A method for molecularly imprinted solid-phase extraction (MISPE) of the fungicide pyrimethanil from wine samples has been investigated. The molecular imprinted polymer was obtained by iniferter-mediated grafting on porous chloromethylated polystyrene beads, using methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the cross-linker. The imprinted beads were evaluated for use as a solid-phase extraction sorbent, in order to develop the extraction protocol in aqueous standards and red wine samples. The optimised extraction protocol resulted in a reliable MISPE method suitable for HPLC analysis (stationary phase: Cromolith Performance C18 column, 100 mm x 4.6 mm; mobile phase: acetonitrile-water (3:2, v/v), flow-rate: 1.00 ml/min; detection 270 nm). It was selective for pyrimethanil and the related pyrimidinic fungicides cyprodinil and mepanipyrim, while the non-pyrimidinic fungicides benalaxyl, chlozolinate, furalaxyl, iprodione, metalaxyl, nuarimol, procymidone and vinclozolin were not extracted. Recoveries performed on a wine matrix spiked with pyrimethanil at three different concentration levels were reproducible and were in good agreement with the recoveries performed on buffer, coming out between 80 and 90% (85+/-7.0% at 0.50 microg/ml, 79+/-1.6% at 2.0 microg/ml and 87+/-5.6% at 20 microg/ml). Preconcentration and quantitative extraction of pyrimethanil from wine samples was shown to be feasible down to 0.1 microg/ml.
Collapse
Affiliation(s)
- C Baggiani
- Laboratory of Bioanalytical Chemistry, Department of Analytical Chemistry, University of Torino, Via P.Giuria 5, 10125 Torino, Italy.
| | | | | | | |
Collapse
|
25
|
Chang MS, Ji Q, Zhang J, El-Shourbagy TA. Historical review of sample preparation for chromatographic bioanalysis: pros and cons. Drug Dev Res 2007. [DOI: 10.1002/ddr.20173] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
26
|
Sanvicens N, Moore EJ, Guilbault GG, Marco MP. Determination of haloanisols in white wine by immunosorbent solid-phase extraction followed by enzyme-linked immunosorbent assay. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:9176-83. [PMID: 17117807 DOI: 10.1021/jf0612373] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A high through-put screening immunochemical method to control the presence of 2,4,6-trichloroanisol (TCA) and 2,4,6-tribromoanisol (TBA), the main agents responsible for the musty odor in wine samples, has been developed. The method involves a selective (antibody-antigen) solid-phase extraction (SPE), followed by enzyme-linked immunosorbent assay (ELISA) analysis. The sample preparation method established uses for immunosorbents (ISs) prepared by covalently coupling antibodies developed for TCA on a sepharose support. At present, about 200-400 ng L-1 of TBA and TCA can be detected in white wine samples by the IS-SPE-ELISA method described here without any preconcentration step. Simultaneous analyses of many samples are possible with this method. Related chloroanisoles (2,3- and 2,6-dichloroanisols and 2,3,4,5-tetrachloroanisol) and chlorophenols (2,3,4,6-tetrachlorophenol and pentachlorophenol) usually present in contaminated wine samples are also effectively retained by the IS, although only 2,4,6-TCA and 2,4,6-TBA are detected by the ELISA used. The immunopurification procedure developed could also be useful as a selective cleanup method prior to chromatographic analysis.
Collapse
Affiliation(s)
- Nuria Sanvicens
- Applied Molecular Receptors Group (AMRg), Department of Biological Organic Chemistry, IIQAB-CSIC, Jordi Girona 18-26, 08034-Barcelona, Spain
| | | | | | | |
Collapse
|
27
|
Qi XH, Mi JQ, Zhang XX, Chang WB. Design and preparation of novel antibody system and application for the determination of heroin metabolites in urine by capillary electrophoresis. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.07.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
28
|
Vera-Avila LE, Vázquez-Lira JC, García de Llasera M, Covarrubias R. Sol-gel immunosorbents doped with polyclonal antibodies for the selective extraction of malathion and triazines from aqueous samples. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2005; 39:5421-6. [PMID: 16082975 DOI: 10.1021/es048000c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Sol-gel immunosorbents (IS) prepared by encapsulation of polyclonal antibodies in silica were packed in cartridges and evaluated for selective immunoaffinity extraction (IAE) of malathion and triazines from aqueous samples. Encapsulated atrazine antibodies highly cross-reacted with simazine and propazine but did not recognize prometon and prometryn. No cross-reactivity of malathion antibodies was observed with the closely related metabolites oxomalathion and isomalathion. Mean IS binding capacities per milligram of entrapped antibody were 0.33 nmol of malathion and 0.47 nmol of atrazine (approximately 100 ng each). This capacity remained constant for at least 10 weeks, and the cartridge reusability was excellent (>60 IAE runs); also, high preconcentration factors were feasible because the breakthrough of analytes from IS cartridges did not occur up to the 250 mL sample volumes, provided that the capacity was not surpassed. Simple and rapid methods for determination of malathion or three triazines in surface water were developed using off-line IAE and HPLC-UV. The application to 50 mL dam water samples spiked at approximately 1 ng/mL of pesticides resulted in recoveries of approximately 90% and RSD < 5% (n=7). LODs for this sample volume (direct injection of IS eluates) were in the range of 0.15-0.50 ng/mL. Lower LODs (0.03-0.1 ng/mL) were achieved by online analysis of whole eluates previously loaded in RP precolumns.
Collapse
Affiliation(s)
- Luz E Vera-Avila
- Departamento de Química Analítica, Facultad de Química, Universidad Nacional Autónoma de México, 04510, DF, México.
| | | | | | | |
Collapse
|
29
|
Nevanen TK, Simolin H, Suortti T, Koivula A, Söderlund H. Development of a High-Throughput Format for Solid-Phase Extraction of Enantiomers Using an Immunosorbent in 384-Well Plates. Anal Chem 2005; 77:3038-44. [PMID: 15889891 DOI: 10.1021/ac040141+] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An antibody-based solid-phase extraction method for filtered 384-well plates was developed for a medical drug candidate having two enantiomeric forms in order to demonstrate the potential of the use of recombinant antibody fragments as specific and efficient immunosorbents. An immobilization method using a six-histidine tag of the antibody fragment and mild oxidation was applied in order to immobilize antibody fragments in an oriented and kinetically stable way that ensured high capacity of the antibody support. Phosphate buffer or plasma spiked with enantiomers were used as samples. Selective solid-phase extraction was followed by liquid chromatography-mass spectrometry analysis. Average recoveries for buffer and plasma samples ranged from 79 to 122% and 80 to 108%, respectively. Good linearity was observed in the concentration range of 30-3000 ng/mL of the enantiomer.
Collapse
|
30
|
Visser NFC, Lingeman H, Irth H. Sample preparation for peptides and proteins in biological matrices prior to liquid chromatography and capillary zone electrophoresis. Anal Bioanal Chem 2005; 382:535-58. [PMID: 15834556 DOI: 10.1007/s00216-005-3120-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Revised: 01/17/2005] [Accepted: 01/24/2005] [Indexed: 11/30/2022]
Abstract
The determination of peptides and proteins in a biological matrix normally includes a sample-preparation step to obtain a sample that can be injected into a separation system in such a way that peptides and proteins of interest can be determined qualitatively and/or quantitatively. This can be a rather challenging, labourious and/or time-consuming process. The extract obtained after sample preparation is further separated using a compatible separation system. Liquid chromatography (LC) is the generally applied technique for this purpose, but capillary zone electrophoresis (CZE) is an alternative, providing fast, versatile and efficient separations. In this review, the recent developments in the combination of sample-preparation procedures with LC and CZE, for the determination of peptides and proteins, will be discussed. Emphasis will be on purification from and determination in complex biological matrices (plasma, cell lysates, etc.) of these compounds and little attention will be paid to the proteomics area. Additional focus will be put on sample-preparation conditions, which can be 'hard' or 'soft', and on selectivity issues. Selectivity issues will be addressed in combination with the used separation technique and a comparison between LC and CZE will be made.
Collapse
Affiliation(s)
- N F C Visser
- Faculty of Sciences, Division of Chemistry, Department of Analytical Chemistry and Applied Spectroscopy, Vrije Universiteit Amsterdam, de Boelelaan 1083, 1081, HV, Amsterdam, The Netherlands
| | | | | |
Collapse
|
31
|
Nichkova M, Marco MP. Development and evaluation of C18 and immunosorbent solid-phase extraction methods prior immunochemical analysis of chlorophenols in human urine. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.10.068] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
32
|
Qi XH, Mi JQ, Zhang XX, Chang WB. Electrochemical studies on the interaction of morphine and its analogs with its antibody. Electrochem commun 2005. [DOI: 10.1016/j.elecom.2005.01.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
33
|
Development of a molecularly imprinted polymer based solid-phase extraction of local anaesthetics from human plasma. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2004.09.051] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
34
|
Tozzi C, Anfossi L, Giraudi G. Affinity chromatography techniques based on the immobilisation of peptides exhibiting specific binding activity. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 797:289-304. [PMID: 14630156 DOI: 10.1016/s1570-0232(03)00481-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Affinity chromatography is one of the powerful techniques in selective purification and isolation of a great number of compounds. New challenges in scientific research, such as high-throughput systems, isolation procedures that allow to obtain a single substance from a complex matrix in high degree of purity, low costs and wide availability, have led to the discovery of new tailor-made synthetic recognition systems. In this review the design, synthesis, purification and characterisation of peptides with recognition properties are discussed. Applications of peptide ligands are described and analytical tools mentioned.
Collapse
Affiliation(s)
- Cinzia Tozzi
- Department of Analytical Chemistry, University of Turin, Via P. Giuria 5, 10125 Turin, Italy.
| | | | | |
Collapse
|
35
|
Fischer-Durand N, Salmain M, Rudolf B, Vessières A, Zakrzewski J, Jaouen G. Synthesis of metal-carbonyl-dendrimer-antibody immunoconjugates: towards a new format for carbonyl metallo immunoassay. Chembiochem 2004; 5:519-25. [PMID: 15185376 DOI: 10.1002/cbic.200300800] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We report the preparation of metal-carbonyl-dendrimer-antibody conjugates. These metal-carbonyl-multilabeled antibodies are designed to be used in a new solid-phase-format carbonyl metallo immunoassay (CMIA). A fourth-generation polyamidoamine dendrimer was labeled with 10-25 (eta5-cyclopentadienyl)iron dicarbonyl (eta1-N-succinimidyl) entities. An antibody was chemically modified at its carbohydrate chains by a site-directed process used to preserve the antigen-antibody binding site. The antibody was then coupled with the dendrimer labeled with 10 metal carbonyl groups. An average of 1.4 labeled dendrimers were grafted per antibody molecule. These metal-carbonyl-dendrimer-antibody conjugates were used as new universal detection reagents that recognize their specific antigens. The antigens were spotted onto nitrocellulose membranes and detected by using the conjugates in combination with Fourier transform infrared spectroscopy. A detection level in the range 5-200 pmol per membrane was achieved. This approach opens the way to a new CMIA format.
Collapse
Affiliation(s)
- Nathalie Fischer-Durand
- Laboratoire de Chimie Organométallique, UMR CNRS 7576, Ecole Nationale Supérieure de Chimie de Paris, 11 rue Pierre et Marie Curie, 75231 Paris 05, France
| | | | | | | | | | | |
Collapse
|
36
|
Theodoridis G, Zacharis CK, Tzanavaras PD, Themelis DG, Economou A. Automated sample preparation based on the sequential injection principle. J Chromatogr A 2004; 1030:69-76. [PMID: 15043255 DOI: 10.1016/j.chroma.2003.12.036] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A molecularly imprinted polymer (MIP) prepared using caffeine, as a template, was validated as a selective sorbent for solid-phase extraction (SPE), within an automated on-line sample preparation method. The polymer produced was packed in a polypropylene cartridge, which was incorporated in a flow system prior to the HPLC analytical instrumentation. The principle of sequential injection was utilised for a rapid automated and efficient SPE procedure on the MIP. Samples, buffers, washing and elution solvents were introduced to the extraction cartridge via a peristaltic pump and a multi-position valve, both controlled by appropriate software developed in-house. The method was optimised in terms of flow rates, extraction time and volume. After extraction, the final eluent from the extraction cartridge was directed to the injection loop and was subsequently analysed on HPLC. The overall set-up facilitated unattended operation, operation and improved both mixing fluidics and method development flexibility. This system may be readily built in the laboratory and can be further used as an automated platform for on-line sample preparation.
Collapse
Affiliation(s)
- Georgios Theodoridis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
| | | | | | | | | |
Collapse
|
37
|
Picó Y, Blasco C, Font G. Environmental and food applications of LC-tandem mass spectrometry in pesticide-residue analysis: an overview. MASS SPECTROMETRY REVIEWS 2004; 23:45-85. [PMID: 14625892 DOI: 10.1002/mas.10071] [Citation(s) in RCA: 179] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An overview is given on pesticide-residue determination in environmental and food samples by liquid chromatography/mass spectrometry/mass spectrometry (LC/MS/MS). Pesticides comprise a large number of substances that belong to many completely different chemical groups, the only common characteristic is that they are effective against pests. They still constitute a challenge in MS because there is no collective pathway for fragmentation. A brief introduction to the theory of tandem MS permits a discussion of which parameters influence the ionization efficiency when the ions are subjected to different actions. Emphasis is placed on the different tandem MS instruments: triple and ion-trap quadrupoles, and hybrid quadrupole time-of-flight (Q-TOF), including advantages and drawbacks, typical detection limits, and ion signals at low concentrations. The instrumental setup, as well as LC and mass spectrometric experimental conditions, must be carefully selected to increase the performance of the analytical system. The capacity of each instrument to provide useful data for the identification of pesticides, and the possibility to obtain structural information for the identification of target and non-target compounds, are discussed. Finally, sample preparation techniques and examples of applications are debated to reveal the potential of the current state-of-the-art technology, and to further promote the usefulness of tandem MS.
Collapse
Affiliation(s)
- Yolanda Picó
- Laboratori de Bromatologia i Toxicologia, Facultat de Farmàcia, Universitat de València, Av Vicent Andrés Estellés s/n, 46100 Burjassot, València, Spain.
| | | | | |
Collapse
|
38
|
|
39
|
Grant GA, Frison SL, Sporns P. A sensitive method for detection of sulfamethazine and N4-acetylsulfamethazine residues in environmental samples using solid phase immunoextraction coupled with MALDI-TOF MS. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2003; 51:5367-5375. [PMID: 12926885 DOI: 10.1021/jf0343231] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Sulfamethazine (SMT) and its major metabolite, N(4)-acetylsulfamethazine (NA-SMT), were each recovered from spiked water (0.1 ppb) and 10% (w/v) aqueous suspensions of soil (1 ppb) or composted manure (1 ppb), by using a three-stage solid phase immunoextraction (SPIE) system, followed by detection with matrix-assisted laser/desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Sulfonamide recovery rates are reported for separate stages of the SPIE system and for trace-level sulfonamide SPIE extraction from the environmental samples. SPIE MALDI-TOF MS is a rapid and definitive technique with potentially better efficiency relative to other established trace-level sulfonamide analytical methods. SPIE MALDI-TOF MS required 1.5 h per batch (8-24 samples/batch) for sample enrichment, 5 min per batch for probe preparation, and 5 min per sample to acquire and process the spectrum. This is the first time MALDI-TOF MS has been reported as a potential means of detecting trace-level drug residues in complex environmental samples.
Collapse
Affiliation(s)
- G A Grant
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
| | | | | |
Collapse
|
40
|
Sanvicens N, Varela B, Marco MP. Immunochemical determination of 2,4,6-trichloroanisole as the responsible agent for the musty odor in foods. 2. Immunoassay evaluation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2003; 51:3932-3939. [PMID: 12822926 DOI: 10.1021/jf034001x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Immunoassays for 2,4,6-trichloroanisol (TCA) have been evaluated. The assays were developed after raising antibodies against three different immunizing haptens (1). Lack of reproducibility has been one of the main problems of these assays. Precision was worse on these assays, reaching lower limits of detection. The high lipophilicity of TCA and its, consequently, low water solubility have been found to be the major cause of this problem. A reliable microplate-based enzyme-linked immunosorbent assay (ELISA) has been set after consideration of the TCA physicochemical features and evaluation of important parameters affecting immunoassay performance. The immunoassay uses As78 (developed against hapten B-KLH) and C9-OVA as the coating antigen. The selectivity is high although the brominated analogue 2,4,6-TBA is also recognized. In buffered media containing 7% ethanol, the resulting assay shows a good accuracy with an IC(50) value of 0.53 microgram L(-)(1) and a limit of detection of 0.044 microgram L(-)(1). Red and white wine samples caused important interferences in the immunoassay demonstrating the necessity of a cleanup procedure prior to the ELISA.
Collapse
Affiliation(s)
- Nuria Sanvicens
- Department of Biological Organic Chemistry, IIQAB-CSIC, Jordi Girona, 18-26, 08034-Barcelona, Spain
| | | | | |
Collapse
|
41
|
|
42
|
|
43
|
Evaluation of the carbonyl metallo immunoassay (CMIA) for the determination of traces of the herbicide atrazine. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(02)02098-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
44
|
Andersson LI, Schweitz L. Solid-phase extraction on molecularly imprinted polymers. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1567-7192(03)80003-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
|
45
|
Vessières A, Fischer-Durand N, Le Bideau F, Janvier P, Heldt JM, Ben Rejeb S, Jaouen G. First carbonyl metallo immunoassay in the environmental area: application to the herbicide chlortoluron. Appl Organomet Chem 2002. [DOI: 10.1002/aoc.349] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
46
|
Eskola M, Kokkonen M, Rizzo A. Application of manual and automated systems for purification of ochratoxin a and zearalenone in cereals with immunoaffinity columns. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:41-47. [PMID: 11754539 DOI: 10.1021/jf010743j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A manual vacuum manifold and an automated solid phase extraction (ASPEC) system were applied for purification of ochratoxin A and zearalenone in wheat, rye, barley, and oat samples with immunoaffinity columns followed by separation with a high-performance liquid chromatograph and fluorescence detection. The immunoaffinity columns for manual sample purification were purchased from a different manufacturer than were those for the automated system. The limit of detection (LOD) for the method for ochratoxin A with a vacuum manifold and ASPEC was 0.1 microg/kg. For the method for zearalenone, the LODs were 1.5 microg/kg with a vacuum manifold and 3 microg/kg with ASPEC. For the methods for ochratoxin A at spiking levels of 0.6 and 2.5 microg/kg, mean recoveries for different cereals varied from 68 to 106%. For the methods for zearalenone, mean recoveries varied from 78 to 117% at spiking levels of 9 and 25 microg/kg. The relative standard deviations of repeatability with various cereals employing both methods were 2-15 and 2-19% for ochratoxin A and zearalenone, respectively.
Collapse
Affiliation(s)
- Mari Eskola
- National Veterinary and Food Research Institute (EELA), Department of Chemistry, P.O. Box 45 (Hämeentie 57), FIN-00581 Helsinki, Finland.
| | | | | |
Collapse
|
47
|
Poole CF. Chapter 12 Principles and practice of solid-phase extraction. SAMPLING AND SAMPLE PREPARATION FOR FIELD AND LABORATORY 2002. [DOI: 10.1016/s0166-526x(02)80049-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
48
|
Schedl M, Wilharm G, Achatz S, Kettrup A, Niessner R, Knopp D. Monitoring polycyclic aromatic hydrocarbon metabolites in human urine: extraction and purification with a sol-gel glass immunosorbent. Anal Chem 2001; 73:5669-76. [PMID: 11774906 DOI: 10.1021/ac010868n] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new, rapid method for selective extraction of hydroxylated polycyclic aromatic hydrocarbons metabolites (OH-PAHs) in human urine was developed using an immunosorbent of anti-pyrene antibodies which were encapsulated in a sol-gel glass (SGG) matrix. Resulting chromatograms after immunoextraction of urine samples and HPLC analysis of the extracts were free from matrix interferences. The LODs for the determination of OH-PAHs in these difficult samples were in the low-ppt range (1-16 ng/L). In addition to its high selectivity, the immunosorbent proved to be robust and reusable. Obtained recoveries in spiked urine samples ranged from 83 to 107% for the hydroxyphenanthrene and hydroxypyrene compounds under investigation, while recovery for 3-hydroxybenzo[a]pyrene was only 45-62%. In a biomonitoring study, the SGG immunosorbent was successfully used for trace-level analysis of OH-PAHs in 20 human urine samples. Results were compared to data obtained by an independent reference analysis method and revealed good correlation between both methods.
Collapse
Affiliation(s)
- M Schedl
- Institute of Hydrochemistry, Technical University Munich, Germany
| | | | | | | | | | | |
Collapse
|
49
|
Guzman NA, Stubbs RJ. The use of selective adsorbents in capillary electrophoresis-mass spectrometry for analyte preconcentration and microreactions: a powerful three-dimensional tool for multiple chemical and biological applications. Electrophoresis 2001; 22:3602-28. [PMID: 11699899 DOI: 10.1002/1522-2683(200109)22:17<3602::aid-elps3602>3.0.co;2-x] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Much attention has recently been directed to the development and application of online sample preconcentration and microreactions in capillary electrophoresis using selective adsorbents based on chemical or biological specificity. The basic principle involves two interacting chemical or biological systems with high selectivity and affinity for each other. These molecular interactions in nature usually involve noncovalent and reversible chemical processes. Properly bound to a solid support, an "affinity ligand" can selectively adsorb a "target analyte" found in a simple or complex mixture at a wide range of concentrations. As a result, the isolated analyte is enriched and highly purified. When this affinity technique, allowing noncovalent chemical interactions and biochemical reactions to occur, is coupled on-line to high-resolution capillary electrophoresis and mass spectrometry, a powerful tool of chemical and biological information is created. This paper describes the concept of biological recognition and affinity interaction on-line with high-resolution separation, the fabrication of an "analyte concentrator-microreactor", optimization conditions of adsorption and desorption, the coupling to mass spectrometry, and various applications of clinical and pharmaceutical interest.
Collapse
Affiliation(s)
- N A Guzman
- Bioanalytical Drug Metabolism, The R. W. Johnson Pharmaceutical Research Institute, Raritan, NJ 08869, USA.
| | | |
Collapse
|
50
|
Ikegawa S, Isriyanthi NM, Nagata M, Yahata K, Ito H, Mano N, Goto J. The enantioselective immunoaffinity extraction of an optically active ibuprofen-modified peptide fragment. Anal Biochem 2001; 296:63-72. [PMID: 11520033 DOI: 10.1006/abio.2001.5198] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acyl glucuronides are known to produce the covalently bound protein adducts which may be the cause of hypersensitivity and toxic responses to acidic drugs. The structural analysis of the drug-protein adducts is therefore needed. From this point of view, we developed an enantioselective immunoaffinity extraction method, which employs an immobilized antibody to specifically isolate peptide fragments that have been modified with optically active ibuprofen. Rabbits were immunized with (S)-ibuprofen coupled to bovine serum albumin through a beta-alanine group. The elicited antibody strongly recognizes the asymmetric center and the isobutylphenyl moiety of (S)-ibuprofen and its conjugates but has a low affinity for their anti podes. A 0.5-mL aliquot of the immunosorbent (11.5 mg of IgG/mL gel) prepared by immobilization of the antibody was capable of retaining up to 1 microg of (S)-ibuprofen. When a mixture of substance P with (R)- and (S)-ibuprofen-modified substance P was loaded on the immunosorbent, the (S)-ibuprofen-modified substance P was selectively retained. The modified peptide was quantitatively recovered by elution with 10 mM ammonium acetate buffer (pH 5.0)/methanol (5:95, v/v). The proposed method would be useful for the structural characterization of optically active ibuprofen-modified human serum albumin.
Collapse
Affiliation(s)
- S Ikegawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai, 980-8578, Japan
| | | | | | | | | | | | | |
Collapse
|