RetraLabs Knowledge

Peptide science, analysis and evidence

Reference material on peptide chemistry, analytical testing, research evidence and regulation — written to be accurate about what is known and explicit about what is not.

Recent articles

12 articles · page 1 of 2

Laboratory Testing & Quality

How to Read a Peptide Certificate of Analysis

A section-by-section guide to COAs: what each figure means, which claims a certificate can support, and the gaps that most often go unnoticed.

4 min read
Peptide Science

Incretin Pharmacology: GLP-1, GIP, Glucagon and Amylin Receptors

How the incretin system works, why multi-receptor agonists were developed, and what distinguishes the compounds in this rapidly moving research area.

3 min read
Laboratory Testing & Quality

Mass Spectrometry for Peptide Identification

How ESI and MALDI differ, why multiply charged ions appear, what tandem MS adds over intact mass, and the limits of each approach.

2 min read
Peptide Science

Peptide Classification: Analogues, Conjugates, Mimetics and Complexes

Why a GLP-1 analogue, a copper tripeptide complex and a retro-inverso peptide belong in different categories, and what the distinctions predict about their behaviour.

2 min read
Laboratory Testing & Quality

Peptide Purity and Identity Testing: Which Method Answers Which Question

RP-HPLC, mass spectrometry, amino-acid analysis and Karl Fischer titration each answer a different question. A guide to choosing and interpreting them.

2 min read
Laboratory Testing & Quality

Peptide Reference Standards: What They Are and Why Identity Work Needs Them

The difference between a reference standard, a working standard and an ordinary sample, and why comparison against a characterised material beats a mass measurement.

2 min read
Peptide Science

Peptide Science Glossary

Plain-language definitions of the terms used across peptide chemistry, analysis, pharmacology and regulation — a reference for reading the literature.

3 min read
Peptide Chemistry

Peptide Stability, Degradation and Storage

The chemical routes by which peptides degrade — hydrolysis, oxidation, deamidation, aggregation — and what storage and handling practice follows from them.

2 min read
Research & Clinical Evidence

Reading Peptide Research: What Animal Studies Can and Cannot Establish

A hierarchy of evidence applied to peptide literature — in-vitro, animal models, observational work and controlled trials — and the failure modes at each level.

2 min read