Guides
How to read what a lab actually reports: certificates, test methods, lot traceability, lyophilized storage, and how names and CAS numbers work across vendors.
- 01
How to read a COA
Match the lot, understand the tests, and verify a certificate of analysis with the laboratory.
- 02
What HPLC purity does and doesn't tell you
How high-performance liquid chromatography measures purity, and the four things a purity percentage does not establish.
- 03
Identity testing by mass spectrometry
How mass spectrometry confirms a molecule matches its expected structure, and where the method's limits are.
- 04
Endotoxin and sterility, two different questions
Why a low endotoxin reading and a sterile result are measured separately, by different methods, and neither implies the other.
- 05
Lot codes and traceability
How a lot code works, why lot-level testing matters more than product-level testing, and how to look one up.
- 06
Lyophilization, why peptides ship as powder
What freeze-drying does to a peptide, and why it is the standard form for shipping and storing research compounds.
- 07
Storage and cold chain for lyophilized material
Temperature, light, and moisture handling for lyophilized peptides, and why the storage line on each compound page says what it says.
- 08
Comparing vendors on evidence, not claims
A checklist for evaluating a research-peptide seller by what it can show, rather than what it says.
- 09
Peptide nomenclature and CAS numbers
Why the same peptide appears under different names and codes across vendors, and how a CAS number resolves the ambiguity.
- 10
Why purity percentages are not comparable across labs
How method, instrument, and reporting convention change what a purity number means, and why 99.5% from one lab isn't automatically better than 99.0% from another.