Testing & Quality
How Are Peptides Made? Solid-Phase Synthesis Explained
Research peptides are built one residue at a time on a solid resin, then cleaved, purified by HPLC and freeze-dried. Each step explains part of the COA.
Lyophilized peptides
Why peptides ship as a freeze-dried cake rather than a solution. These articles cover what lyophilisation removes and what it leaves behind, why the appearance of the cake is a poor guide to quality, the handling the dried form tolerates that a solution does not, and what changes the moment a diluent goes in.
Testing & Quality
Peptide Vials: Sizes, Glass Types, Stoppers and Fill
Peptide vial sizes explained: 2, 3, 5 and 10 mL vials, Type I glass, stoppers and coring, headspace, and how vial size limits reconstitution volume.
Testing & Quality
Tirzepatide Powder: Appearance, Colour and Quality Tests
What lyophilized tirzepatide powder and solution should look like, what colour changes mean, and how identity, purity and content are tested.
Testing & Quality
What Are Lyophilized Peptides? Freeze-Drying Explained
Lyophilized peptides are freeze-dried powders made for stability. How freeze-drying works, what the powder contains, net content and reading the COA.
Lab Handling
Lyophilized Peptide Storage: Temperature, Moisture, Light
How to store lyophilized peptide powder: why −20 °C is standard, how moisture and light shorten shelf life, room-temperature tolerance and opening cold vials.
Lab Handling
Peptide Storage Guide: Powder, Solution and Transport
A practical peptide storage guide: temperatures for powder and solution, which sequences are most sensitive, fridge and freezer practice, and moving samples.