USP Grade
Definition
Material meeting the monograph for that substance in the United States Pharmacopeia, which specifies the tests and limits. The grade is only meaningful where a monograph exists, and most research peptides have none.
Terms used in this definition
Other entries this definition refers to.
What this means for research sourcing
Purity and identity verification are central to research reproducibility. Every Volta compound ships with >99% HPLC-verified purity and a certificate of analysis.
Related Terms in Quality
GMP Grade
Material produced under Good Manufacturing Practice, a regulated system covering facilities, documentation and release rather than a purity figure. It is a claim about how material was made, and it is auditable.
Third-Party Tested
Analysed by a laboratory independent of the supplier. The phrase is only worth the certificate behind it: the useful questions are which laboratory, which lot, which tests, and whether the report can be verified at source.
Variability
The spread in results from repeated measurement or from different units of the same material. Distinguishing variability in the method from variability in the product is the reason control samples are run alongside real ones.
Certificate of Analysis (COA)
The analytical report for one batch, stating identity, purity and whatever else was tested. Its worth depends entirely on who ran the tests and on whether the batch number matches the material in hand, which is what makes a batch number worth checking rather than glancing at.
HPLC (High-Performance Liquid Chromatography)
The separation technique behind the purity figure on a certificate. A sample is pushed through a packed column under pressure and the components come off at different times, so a 99% result means 99% of what the detector saw was the target peak.
Chromatography
Any technique that separates a mixture by how its components distribute between a moving phase and a stationary one. Reversed-phase liquid chromatography is the version peptide work almost always means.
Mass Spectrometry (MS)
Measurement of the mass-to-charge ratio of ionised molecules, used to confirm that the observed mass matches the mass the sequence predicts. It supports identity; on its own it does not prove the full sequence, since rearrangements can share a mass.
Amino Acid Analysis (AAA)
Hydrolysing a peptide back to its constituent amino acids and quantifying each one, which gives composition and total peptide content. It answers a question HPLC does not: how much peptide is actually in the vial.