--- title: "Research Peptide Documentation and Testing Glossary | Beach Bio Research" description: "Plain-language definitions for COA, lot, identity, purity, assay, HPLC, LC-MS, acceptance criteria, retest dates, and other research-documentation terms." canonical: "https://beachbioresearch.com/resources/research-peptide-terminology/" --- # Research Peptide Documentation and Testing Glossary > Analytical terms are most useful when they preserve the limits of the underlying measurement. This glossary defines common documentation language without turning a test name or percentage into a broader quality claim. Prepared by Beach Bio Research. Updated August 17, 2026. ## Key points - Use each term in the context of its stated procedure and sample. - Do not treat identity, purity, content, and stability as synonyms. - A definition explains a record; it does not certify a material or lot. ## Documents and traceability These terms connect a physical research material to its supporting record. Exact usage can vary by organization, so the controlling procedure and document should take precedence over a general glossary. - **Certificate of analysis (COA):** A lot-specific document reporting tests, procedures or references, specifications, and results provided by an issuing organization. - **Lot or batch:** A defined quantity assigned a shared identifier for production, testing, traceability, and disposition. - **Catalog code:** A supplier's identifier for a listing or presentation; it is not a substitute for a lot number. - **Chain of custody:** The documented sequence of possession, transfer, location, and responsibility for a material or sample. - **Specification:** A defined set of tests, analytical references, and acceptance criteria used to evaluate a material for a stated purpose. ## Analytical results Results should remain attached to the method, units, sample, and decision rule that produced them. Similar-looking numbers can represent different measurements. - **Identity:** Evidence used to determine whether a sample is consistent with the named material and distinguish it from plausible alternatives. - **Purity:** A description of the relative freedom from specified or detected extraneous components under a defined measurement approach. - **Assay or content:** A quantitative determination of the amount of a defined component in a sample under the stated method and reporting basis. - **Acceptance criterion:** A predefined numerical limit, range, or other condition used to evaluate a result. - **Pass or conforms:** A decision that the reported result met the stated criterion; it should not be expanded to attributes that were not tested. ## Chromatography and mass spectrometry Instrument names describe analytical platforms. The procedure, settings, reference materials, controls, calculations, and validation determine what conclusion the data can support. - **HPLC:** High-performance liquid chromatography, a technique that separates sample components in a liquid mobile phase and records detector response over time. - **LC-MS:** Liquid chromatography coupled to mass spectrometry, combining chromatographic separation with mass-to-charge measurements. - **Chromatogram:** A plot of detector response against time or elution volume for a chromatographic run. - **Retention time:** The observed time associated with a component under the specific chromatographic conditions. - **Mass spectrum:** A representation of detected ion abundance against mass-to-charge ratio under the stated instrument conditions. - **Reference standard:** A characterized material used as a comparison or calibration reference for a defined analytical purpose. ## Material form and stability Form and dating terms describe the material and the evidence-supported period under stated conditions. They do not provide directions for personal use. - **Lyophilized:** Freeze-dried under a defined process to remove water; the term alone does not establish composition, sterility, or storage life. - **Storage condition:** The documented environmental range and protections under which supporting information applies. - **Temperature excursion:** A documented period outside the stated temperature condition that requires review and disposition. - **Retest date:** The date after which a material should be examined again against appropriate criteria before continued use under the applicable system. - **Expiry date:** The end of a supported period under stated conditions, as assigned by the responsible organization. ## Scope of this glossary The glossary supports qualified laboratory, analytical, and educational research documentation. It does not create a specification, validate a procedure, interpret a particular result, or certify any supplier, laboratory, material, or lot. No definition on this page provides medical, clinical, dosing, administration, preparation, or personal-use guidance. Beach Bio Research catalog items are not for human or veterinary use or consumption. ## Primary references These references provide analytical and documentation context. They do not imply that a particular catalog item is approved or governed by the cited framework. - [Q2(R2) Validation of Analytical Procedures](https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q2r2-validation-analytical-procedures) — U.S. Food and Drug Administration. General framework for analytical-procedure validation and performance characteristics. - [Q6A Specifications: Test Procedures and Acceptance Criteria](https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q6a-specifications-test-procedures-and-acceptance-criteria-new-drug-substances-and-new-drug-products) — U.S. Food and Drug Administration. Discusses identification, test procedures, specifications, and acceptance criteria. - [Q7A Good Manufacturing Practice Guidance for Active Pharmaceutical Ingredients](https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q7a-good-manufacturing-practice-guidance-active-pharmaceutical-ingredients) — U.S. Food and Drug Administration. Includes a detailed description of information commonly recorded on certificates of analysis. - [Mass Spectrometry Instrument Laboratory](https://www.nist.gov/mml/csd/biochemical-and-exposure-science-group/mass-spectrometry-instrument-lab) — National Institute of Standards and Technology. Overview of liquid chromatography and mass-spectrometry capabilities for chemical analysis. ## Research-use-only boundary All catalog items are for qualified laboratory, analytical, or educational research only. They are not for human or veterinary use or consumption, and Beach Bio Research does not provide medical, dosing, administration, or personal-use guidance. [View all research resources](https://beachbioresearch.com/resources/)