Abstract
Complex matrices, for example urine, serum, plasma, and whole blood, which are common in clinical chemistry testing, contain many non-analyte compounds that can interfere with either detection or in-source ionization in chromatography-based assays. To overcome this problem, analytes are extracted by protein precipitation, solid-phase extraction (SPE), and liquid–liquid extraction. With correct chemistry and well controlled material SPE may furnish clean specimens with consistent performance. Traditionally, SPE has been performed with particle-based adsorbents, but monolithic SPE is attracting increasing interest of clinical laboratories. Monoliths, solid pieces of stationary phase, have bimodal structures consisting of macropores, which enable passage of solvent, and mesopores, in which analytes are separated. This structure results in low back-pressure with separation capabilities similar to those of particle-based adsorbents. Monoliths also enable increased sample throughput, reduced solvent use, varied support formats, and/or automation. However, many of these monoliths are not commercially available. In this review, application of monoliths to purification of samples from humans before chromatography-based assays will be critically reviewed.
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Abbreviations
- AP:
-
Amphetamine
- CLB:
-
Clenbuterol
- CV:
-
Coefficient of variation
- EGDMA:
-
Ethylene glycol dimethacrylate
- EPI:
-
Epinephrine
- ESI:
-
Electrospray ionization
- GMA:
-
Glycidyl methacrylate
- LC:
-
Liquid chromatography
- LLE:
-
Liquid–liquid extraction
- LOD:
-
Limit of detection
- LOQ:
-
Limit of quantification
- MA:
-
Methamphetamine
- MAA:
-
Methacrylic acid
- MDA:
-
3,4-Methylenedioxyamphetamine
- MDMA:
-
3,4-Methylenedioxymethamphetamine
- MET:
-
Metanephrine
- MIP:
-
Molecularly imprinted polymer
- MS:
-
Mass spectrometry
- NORMET:
-
Normetanephrine
- PPT:
-
Protein precipitation
- QC:
-
Quality control
- SPE:
-
Solid-phase extraction
- SPME:
-
Solid-phase microextraction
- UV:
-
Ultraviolet
- WCX:
-
Weak cation exchange
- 2D:
-
Two-dimensional
- 8-OHdG:
-
8-Hydroxy-2′-deoxyguanosine
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Published in the topical collection Monolithic Columns in Liquid Phase Separations with guest editor Luis A. Colon.
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Bunch, D.R., Wang, S. Applications of monolithic solid-phase extraction in chromatography-based clinical chemistry assays. Anal Bioanal Chem 405, 3021–3033 (2013). https://doi.org/10.1007/s00216-013-6761-0
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DOI: https://doi.org/10.1007/s00216-013-6761-0