4 min read
What Are Peptides?
Peptides, small molecules, and how a lab checks what's really in the vial.
key idea
Retention time alone can't prove identity. LC-MS confirms it by measuring the molecule's mass.
learn · articles
Plain answers from the lab bench.
Short guides written by the people who run your samples. What each test measures, how to read a chromatogram, and what the numbers on your COA really mean.
learn · articles
All articles.
3 min read
How Does HPLC Work?
A walk through the instrument, from solvent bottle to chromatogram.
key idea
Purity is the main peak's area divided by the total area of all peaks.
3 min read
Quantity vs. Net Peptide Content
What your COA's numbers mean, and why 10 mg of powder isn't 10 mg of peptide.
key idea
Water, counter-ions and impurities are part of the powder's weight, so net peptide content is lower than purity.
ECA Learn articles are educational material. They describe general analytical principles and are not a substitute for a validated method or a Certificate of Analysis.