Simultaneous Extraction and Analysis of Multiple Cystine-Dense Peptides by μSPE and Microflow-MS/MS From Plasma

Mi-Youn Brusniak et al., Methodology (2019) - PMID: 30892059

Product(s) used in this publication:  Reference Peptides for Targeted Proteomics - SpikeTides™ & SpikeMix™



Develop a universal extraction and liquid chromatography-mass spectrometer method to simultaneously analyze cystine-dense peptide (CDP) miniproteins from rat and human plasma. The results of the analysis will be used to assist selection of therapeutic drug candidates from the vast CDP library.


A micro-elution solid-phase extraction method was developed for the sample preparation of the CDP peptides in rat and human plasma followed by analysis by microflow liquid chromatography MS/MS. The methods developed for drug discovery were found to be accurate (±≤15.2% from nominal concentrations) and precise (≤13.4% CV), with a dynamic range of 1.00-500 ng/ml and extraction recoveries of 47.2-99.0%.


This bioanalytical method can be utilized to screen CDP proteins and other miniproteins for drug discovery, candidate selection and further drug development.

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