Abstract
The choice of sample-preparation method is extremely important in metabolomic studies because it affects both the observed metabolite content and biological interpretation of the data. An ideal sample-preparation method for global metabolomics should (i) be as non-selective as possible to ensure adequate depth of metabolite coverage; (ii) be simple and fast to prevent metabolite loss and/or degradation during the preparation procedure and enable high-throughput; (iii) be reproducible; and (iv) incorporate a metabolism-quenching step to represent true metabolome composition at the time of sampling. Despite its importance, sample preparation is often an overlooked aspect of metabolomics, so the focus of this review is to explore the role, challenges, and trends in sample preparation specifically within the context of global metabolomics by liquid chromatography–mass spectrometry (LC–MS). This review will cover the most common methods including solvent precipitation and extraction, solid-phase extraction and ultrafiltration, and discuss how to improve analytical quality and metabolite coverage in metabolomic studies of biofluids, tissues, and mammalian cells. Recent developments in this field will also be critically examined, including in vivo methods, turbulent-flow chromatography, and dried blood spot sampling.







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Abbreviations
- ADP:
-
Adenosine diphosphate
- AMP:
-
Adenosine monophosphate
- ATP:
-
Adenosine triphosphate
- CHO:
-
Chinese hamster ovary cells
- CSF:
-
Cerebrospinal fluid
- DBS:
-
Dried blood spot or dried biofluid spot
- EDTA:
-
Ethylenediaminetetraacetic acid
- ESI:
-
Electrospray ionization
- GC–MS:
-
Gas chromatography–mass spectrometry
- HILIC:
-
Hydrophilic interaction chromatography
- HPLC:
-
High-performance liquid chromatography
- HUSERMET:
-
Human serum metabolome project
- LC–MS:
-
Liquid chromatography–mass spectrometry
- NAD:
-
Nicotinamide adenine dinucleotide
- NADH:
-
Reduced nicotinamide adenine dinucleotide
- NMR:
-
Nuclear magnetic resonance
- PBS:
-
Phosphate-buffered saline
- PCA:
-
Principal-component analysis
- RSD:
-
Relative standard deviation
- SPE:
-
Solid-phase extraction
- SPME:
-
Solid-phase microextraction
- TFC:
-
Turbulent-flow chromatography
- UHPLC:
-
Ultra-high-performance liquid chromatography
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Vuckovic, D. Current trends and challenges in sample preparation for global metabolomics using liquid chromatography–mass spectrometry. Anal Bioanal Chem 403, 1523–1548 (2012). https://doi.org/10.1007/s00216-012-6039-y
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DOI: https://doi.org/10.1007/s00216-012-6039-y