Resources

Proteomics Databases



Metabolomics Databases

• • AQUA Peptide or Other Internal Standards? Comparing Isotope Dilution Routes for Targeted Quantitation

  Compare AQUA peptides with SILAC, unlabeled spikes, and external calibration for targeted quantitation. Match the standard strategy to your reporting goal.

• • AQUA Peptide Not Performing? Troubleshooting Standard Purity, Spike Level, and Matrix Recovery

  Weak heavy-peptide signal or unstable ratios in AQUA peptide assays? Learn how to troubleshoot standard purity, spike level, storage, and matrix recovery.

• • AQUA Peptides for Absolute Quantitation: How Stable Isotope Standards Convert Targeted LC-MS Signal to Known Amounts

  Learn how AQUA peptides use stable isotope labels and isotope dilution in MRM or PRM assays to report protein and peptide amounts in defined units.

• • Absolute vs Relative Protein Quantification

  Compare absolute and relative protein quantification by reporting goal, calibrator needs, study stage, and documentation depth to choose the right MS workflow.

• • Absolute Protein Quantification: Methods and Uses

  Learn absolute protein quantification methods, including AQUA peptides, isotope dilution, and targeted LC-MS workflows, plus technical value, limits, and research uses.

• • Scoping an Absolute Protein Quantification Project: Calibrators, Panel Size, and Validation Deliverables

  Plan absolute protein quantification with clear calibrator design, panel size, matrix strategy, and validation deliverables. Avoid calibration rework and scope mismatches.

• • Absolute Protein Quantification or Relative Quantitation? Matching AQUA, MRM/PRM, and Label-Free Routes to Your Reporting Goal

  Compare absolute protein quantification with AQUA, relative MRM/PRM, and label-free profiling. Match the route to concentration reporting and study stage.

• • Absolute Protein Quantification Not Meeting Spec? Troubleshooting Calibration Curves, Standard Recovery, and Matrix Bias

  Poor calibration fit or biased concentration values in absolute protein quantification? Learn how to troubleshoot AQUA standards, matrix recovery, and assay design.

• • Absolute Protein Quantification by LC-MS/MS: How AQUA Peptides and Calibration Curves Convert Peptide Signal to Concentration

  Learn how absolute protein quantification uses AQUA peptides, calibration curves, and MRM or PRM assays to report protein concentration in defined units.

• • How to Enrich Low-Abundance Histone Succinylated Peptides?

  In recent years, advances in epigenetics and protein post-translational modification research have made histone modifications an important focus in life science research. In addition to classical acetylation, methylation, and phosphorylation, succinylation has attracted increasing attention as an emerging acylation modification because of its important roles in chromatin architecture and gene expression regulation. However, compared with more abundant modifications, succinylation is typically characte......