How RP-HPLC determines chromatographic area-percent purity, why inorganic salts and moisture are not counted in purity percentages, and how Mass Spectrometry confirms structural sequence fidelity.
A step-by-step breakdown of third-party analytical reports: deciphering chromatographic traces, peak integration parameters, ESI-MS spectral deconvolution, and spotting vendor red flags.
Step-by-step benchtop SOPs: desiccating lyophilized powders, solvent selection based on isoelectric point, avoiding high-shear vortexing, and preventing freeze-thaw degradation.
Different analytical techniques measure fundamentally different attributes of a synthesized peptide:
| Assay Technique | Primary Metric Measured | What It Validates | Inherent Limitation |
|---|---|---|---|
| RP-HPLC (C18) | UV Absorption Area-% at 214nm | Purity relative to UV-active peptide contaminants | Does not detect inorganic salts, counter-ions, or moisture |
| ESI-MS (Mass Spec) | Mass-to-Charge Ratio (m/z) | Definitive molecular mass and chemical identity | Cannot distinguish enantiomers (D- vs L-amino acids) |
| Amino Acid Analysis (AAA) | Molar amino acid stoichiometry | Net peptide content vs total vial powder mass | Labor-intensive; destroys peptide sample via acid hydrolysis |
| Karl Fischer Titration | Coulometric Water Content (%) | Residual bound moisture in lyophilized cake | Measures water exclusively; no information on purity or identity |
Every production lot shipped by Regenerative Health Peptides includes accessible third-party analytical reports with full-spectrum HPLC chromatograms.
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