AIM: To demonstrate and discuss the pros and cons of various conventional and innovative analytical approaches. Methodology & results: Matrix-assisted laser desorption/ionization mass spectrometry imaging (MSI) of tissue sections as well as the extraction of tissue homogenates, blood plasma and dried blood spots coupled with LC-MS were employed to monitor the pharmacokinetics of metformin in mice. The time profile of metformin measured by matrix-assisted laser desorption/ionization MSI correlated well with the results found by LC-MS. Repeatability of the preparation of tissue sections for MSI was very good. CONCLUSION: MSI provided valuable information on the spatial distribution and relative concentration of the analyte within tissue sections. The analysis of the extracts of tissue homogenates, blood plasma and blood spots provided quantitative data on metformin. The dried blood spot approach is a progressive method of sampling, especially in studies where the amount of available blood is limited.

Department of Analytical Chemistry University of Chemistry and Technology Prague Technická 5 16628 Prague Czech Republic

Department of Mass Spectrometry Institute of Organic Chemistry and Biochemistry Academy of Sciences of the Czech Republic Flemingovo náměstí 2 16610 Prague Czech Republic

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