Peptide Research

GLP-1 receptor agonist pharmacology for US laboratories: binding, bias, internalization, species-specific half-lives and multi-agonist mechanisms.

A particle count is a method, not a number. USP says its own two methods are not interchangeable, and the published gap runs to two orders of magnitude.

Below about 0.2 micron, microbial ingress stops. Above it, it does not. What the leak-rate literature says about the one vial attribute no COA reports.

Purity is a snapshot; degradation rate is a sequence property. What deamidation, racemization, oxidation and hydrolysis do, and why a COA cannot see it.

A certificate ends at the vial. Below about 1 micromolar most of a cationic peptide can end up on the tube wall. What the published recovery data says.

ICH Q1B defines a measurable photostability test. No research peptide certificate reports one. What light actually does to a lyophilized vial, and when.

What an ICH accelerated stability study measures, what it is not allowed to predict, and why no research peptide certificate carries a shelf life.

The diluent used to reconstitute a lyophilized research peptide is not chemically inert and is not buffered. What the published data actually shows.

Freeze-drying literature describes formulations built around excipients. A research peptide vial usually contains none — and that changes the data.

A test date is not an expiry date. What ICH Q1A(R2) requires before anyone can claim a shelf life, and why no research peptide COA carries one.