QPrEST White Papers

Discover the QPrEST standards for absolute protein quantification using mass spectrometry. In our white papers, you can learn more about QPrEST technology and unique features.

QPrEST High Accuracy Targeted Proteomics

Summary

  • Stable Isotope-Labeled Protein Standards for absolute quantification using mass spectrometry. 
  • Spiked in early and show a similar digestion efficiency to the endogenous proteins.
  • Used to determine absolute protein amounts in multiple sample types
  • Pre-quantified and ready-to-use
Download
Using the QTag for LC Retention Time Normalization

Summary

  • The QTag present in all QPrEST standards consists of a set of theoretical tryptic peptides which can be used for retention time normalization
  • Retention times of QTag peptides can be accurately predicted using iRT coordinates
Download
Validated Isotope-Labeled Protein Standard for Absolute Quantification Using Mass Spectrometry

Summary

  • The QPrEST+ protein standards are readily available and contain peptides validated according to the CPTAC assay criteria
  • The QPrEST+ protein standard provides quantotypic peptides comparable to stable isotope-labeled full-length proteins
  • QPrEST+ shows good linear responses for quantotypic peptides and are suitable for single-point calibration
Download