The percentage of the desired compound in a sample, as opposed to impurities, degradation products, or other contaminants. Research-grade peptides typically claim >98% purity.
"Purity" is filed under Quality in the PeptideAtlas glossary, alongside 12 other terms in that group.
4 other glossary entries refer to this term in their own definition, which is usually the fastest way to see how it is used in practice.
A document from a laboratory (ideally third-party) that certifies the identity, purity, potency, and quality of a substance. Essential for verifying research peptide quality.
An analytical technique used to separate, identify, and quantify components in a mixture. Used in COAs to determine peptide purity percentage.
An independent organization that sets quality standards for medicines, dietary supplements, and food ingredients in the United States. USP-grade ingredients meet published purity and quality standards. Compounding pharmacies often reference USP chapters (e.g., USP <797> for sterile compounding).
An analytical technique that measures the mass-to-charge ratio of molecules. Used in COAs to confirm peptide identity and molecular weight.
Terms that reference this one: Certificate of Analysis (COA), HPLC (High-Performance Liquid Chromatography), USP (United States Pharmacopeia), Deamidation.
More Quality terms: Certificate of Analysis (COA), HPLC (High-Performance Liquid Chromatography), Mass Spectrometry (MS), Endotoxin, cGMP (Current Good Manufacturing Practice), CAS Number, INCI Name, Amino Acid Analysis (AAA), LAL Test (Limulus Amebocyte Lysate), Sterility Testing, Degradation Product, Third-Party Testing.