Methods & Quality

Analytical methods, accreditation, and how purity is verified.

Endotoxin Testing Explained: USP <85> and Why It Matters for Reconstituted Peptides

Bacterial endotoxin testing is the contamination dimension HPLC purity cannot see. A reading guide to USP <85> and the new USP <86> (recombinant Factor C) — the three LAL methods, the K/M endotoxin-limit calculation, and why the diluent on a reconstituted peptide vial is half the story.

May 3, 202612 min read

Methods & Quality

How We Verify Peptide Purity: HPLC, Mass Spec, and ISO 17025

A walkthrough of the analytical methods PepMax requires for every lot — what each technique measures, why we use accredited third-party labs, and how the results land in the COA you receive.

Apr 30, 202611 min read

Methods & Quality

How to Read a Peptide Certificate of Analysis

A field-by-field reading guide for the certificate of analysis that ships with a research peptide — what every line means, the five fields most stores quietly omit, and the chromatogram and mass-spectrum tells that separate a real COA from a dressed-up summary.

Apr 30, 202613 min read

Methods & Quality

What ≥99% Purity Actually Means in Peptide Research

Most vendors print "≥99% purity" on every product page. The number is meaningful only with a lot-specific COA, a stated method, and an understanding of what HPLC purity does — and does not — measure.

Apr 29, 20269 min read

FOR RESEARCH USE ONLY

This product is sold for in vitro laboratory research purposes only. Not a drug, supplement, or household product. Not intended for human consumption, therapeutic use, or veterinary use. Read the full disclaimer.