Testing methods
What each test measures, which standard defines it, its limits, and how many of our published reports include it.
For laboratory research use only. Not for human consumption.
- HPLC purity analysis
The share of the detected peptide signal that belongs to the main compound, as a percentage of total peak area.
- Mass spectrometry identity confirmation
Whether the material's molecular mass matches the expected mass of the named compound.
- Net peptide content
How many milligrams of the named compound are in the vial.
- Endotoxin testing
Bacterial endotoxin (lipopolysaccharide from Gram-negative bacteria) in the sample.
- Sterility testing
Whether viable microorganisms grow from the sample.
- Heavy-metal screening
Elemental impurities such as lead, cadmium, arsenic and mercury.
- Counter-ion and TFA content
Trifluoroacetate (TFA), acetate or other counter-ions bound to the peptide.
- Water content (Karl Fischer)
Residual water in a lyophilised powder.
- Lyophilization (freeze-drying)
Not a test: the process that turns a peptide solution into the dry powder supplied in the vial.
- Peptide storage stability
How purity and content change over time under a stated storage condition.
- How to verify a Janoshik report
Whether a report you were shown is the one the lab issued.
- Benzyl alcohol assay
The concentration of benzyl alcohol, the preservative in bacteriostatic water.