- Bacteriostatic water (BAC water)
- Sterile water for injection with benzyl alcohol added as a preservative that holds back bacterial growth. It comes in a multiple-dose container, so it can be drawn from more than once.[2]See: Bacteriostatic water vs sterile water
- Batch
- One production run of a compound, identified by the batch number printed on the vial label. A laboratory report names the batch it covers and says nothing about any other batch.See: Reading your vial label
- COA (certificate of analysis)
- A document listing the tests run on a sample and the results. It is only as useful as its scope: read which tests it covers, which batch, and whether the laboratory's own record matches it.See: How to read a Janoshik report
- Concentration
- How much compound each millilitre of solution holds after reconstitution: milligrams in the vial divided by millilitres of water added. 5 mg in 2 mL gives 2.5 mg/mL.See: Reconstitution calculator
- Endotoxin
- A fragment of the outer wall of certain bacteria, measured with the bacterial endotoxins test and reported in endotoxin units (EU). An endotoxin result says nothing about identity, amount or purity.[5]See: Reading an endotoxin result
- HPLC (high performance liquid chromatography)
- A method that pushes a dissolved sample through a packed column so its components separate. The time a peak emerges identifies it against a reference standard, and the peak's area gives the quantity. Purity figures on peptide reports usually come from HPLC.[6]
- Identity test
- A test that checks the substance in the vial is the compound named, most directly by measuring the molecule's mass with mass spectrometry.[6]See: Purity versus identity testing
- Lyophilized
- Freeze-dried. The solution is frozen and put under vacuum so the ice turns straight to vapour, leaving a dry powder or cake. Products are made this way because they are unstable in solution.[1]
- MS (mass spectrometry)
- A method that measures the mass of molecules. Used as a detector after HPLC (LC-MS), it gives mass information that identifies the compound, which a retention time alone does not.[6]
- Reconstitution
- Returning a lyophilized powder to solution by adding a measured volume of diluent, usually bacteriostatic water. The volume added sets the concentration.See: How to reconstitute a peptide vial
- Sterile water for injection
- Water for injection with no preservative, packaged in single-dose vials. The label says to discard what is left after the first withdrawal.[3]
- U-100
- The scale on a standard insulin syringe: 100 units to 1 mL, so one unit is 0.01 mL. It describes volume on the barrel, not an amount of any compound.[4]See: How to read a U-100 insulin syringe
Supplied for laboratory research use only. Not for human consumption. Nothing on this page is medical advice, and nothing here suggests an amount, a frequency or a protocol for any compound.