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A method for quantification of a pharmaceutical peptide in human plasma was developed using gradient elution LC-ICP-MS. A membrane desolvation (MD) system was applied to remove organic solvents from the eluent prior to the detection as SO in the dynamic reaction cell (DRC) of the ICP-DRC-MS instrument and subsequent quantification by post-column isotope dilution (IDA). Plasma proteins were precipitated prior to analysis.
A generic quantification approach was introduced addressing the characterization of protein standards while fulfilling the principles of metrology. Traceable absolute quantification was achieved combining a proven biochemical method, i.e. protein hydrolysis followed by amino acid quantification with the concept of species specific isotope dilution analysis (IDA).
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