HPLC Peptide Purity: How to Read a Chromatogram Without Overclaiming
A practical guide to interpreting peptide HPLC purity, peak area, wavelength, gradients and the questions a chromatogram cannot answer alone.
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LC-MS for Peptide Identity: Molecular Mass, Charge States and Sequence Evidence
How LC-MS supports peptide identity, why charge-state envelopes require deconvolution and when intact mass should be supplemented by sequence-level evidence.
Peptide Content Versus Purity: Why Net Mass Changes Quantitative Experiments
Purity, gross vial mass and net peptide content are not interchangeable. This guide explains how water, counter-ions and salts affect concentration calculations.
Peptide Counter-Ions: TFA, Acetate and Their Experimental Consequences
Why synthetic peptides carry counter-ions, how TFA and acetate affect mass and assays, and what to document when comparing materials.
Endotoxin and Bioburden in Peptide Research: Matching Tests to the Model
Endotoxin, bioburden and sterility answer different questions. This guide helps laboratories select controls appropriate to peptide experiments.
How to Read a Peptide Certificate of Analysis
A field-by-field guide to peptide certificates of analysis, including identity, purity, content, counter-ions, dates, traceability and method limitations.
Peptide Reference Standards and System Suitability
How reference standards, secondary standards and system-suitability samples support defensible peptide identification and quantitation.
Peptide Disulfide Bonds, Oxidation and Analytical Confirmation
Disulfide connectivity and oxidation state can change peptide structure without obvious purity loss. Learn which analytical strategies address the risk.