Abstract
An analytical method based on a green approach is proposed for clinical analysis. The proposed procedure involves the reduction of the sample preparation steps, the amounts of reagents and organic solvents. This simple and sensitive method for the analysis of clinical drug and biomarkers in human plasma was developed using LC connected to tandem mass spectrometry (LC–MS/MS) with a nanospray ion source. In this study, the desired drug and proteins were separated on a 5 and 10 cm RP C18 nano-flow column. Undesired polar substances in human plasma were washed out by using ACN:1% FA = 20:80 (v/v) as the loading mobile phase for drug analysis and good linearity was attainable. Only a small volume of human plasma (10 μL) was utilized for the monitoring of drug plasma concentration and significant proteins under clinical studies. All the sample preparation procedures and the analytical scheme were at microliter level. This strategy would lower the consumption of reagents and organic solvents and make a contribution toward the goal of reduction of pollution from analytical methods in general.
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