Peptide: difference between revisions
Diff·revision 23 → 24·08:20, 27 May 2025
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| Revision 23 — 13:59, 7 May 2025 StubSorterBot (talk) bot: update parent category chain 5,710 bytes +739 | Revision 24 — 08:20, 27 May 2025 ColdChainCleo (talk) add the collapse-temperature point, sourced 6,609 bytes +899 | ||
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| 42 | Because they are made by stepwise chemical synthesis, the impurity profile of a peptide is distinctive: deletion sequences missing one residue, truncated sequences, and modified side chains, all structurally close to the intended molecule and often chromatographically close as well. This is why [[Analytical method validation|method specificity]] against process-related impurities carries the weight it does in peptide analysis, and why a specification is judged by which attributes it covers rather than by the number it reports.{{r|usp1503,ich_q6b}} | 42 | Because they are made by stepwise chemical synthesis, the impurity profile of a peptide is distinctive: deletion sequences missing one residue, truncated sequences, and modified side chains, all structurally close to the intended molecule and often chromatographically close as well. This is why [[Analytical method validation|method specificity]] against process-related impurities carries the weight it does in peptide analysis, and why a specification is judged by which attributes it covers rather than by the number it reports.{{r|usp1503,ich_q6b}} |
| 43 | 43 | ||
| + | 44 | == Peptides in research supply == | |
| + | 45 | A large market exists in peptides supplied for laboratory research. Material in that market is not manufactured under a marketing authorisation, is not released against a pharmacopoeial monograph, and is described by whatever documentation the supplier chooses to provide.{{r|reports}} | |
| + | 46 | ||
| + | 47 | The documentation most often supplied is a [[Certificate of analysis|certificate of analysis]]. What such a document establishes depends entirely on which determinations it reports: an [[Area percent purity|area percent]] figure without [[Peptide content|peptide content]] and water does not establish how much peptide is present, and a purity figure without an identity determination does not establish what the peptide is.{{r|usp1503}} | |
| + | 48 | ||
| 44 | == References == | 49 | == References == |
| 45 | {{reflist}} | 50 | {{reflist}} |
| 46 | <ref name="iupac">International Union of Pure and Applied Chemistry and International Union of Biochemistry, ''Nomenclature and Symbolism for Amino Acids and Peptides'' (recommendations 1983; revised).</ref> | 51 | <ref name="iupac">International Union of Pure and Applied Chemistry and International Union of Biochemistry, ''Nomenclature and Symbolism for Amino Acids and Peptides'' (recommendations 1983; revised).</ref> |
| 47 | <ref name="usp1503">United States Pharmacopeia, General Chapter <1503>, ''Quality Attributes of Synthetic Peptide Drug Substances''.</ref> | 52 | <ref name="usp1503">United States Pharmacopeia, General Chapter <1503>, ''Quality Attributes of Synthetic Peptide Drug Substances''.</ref> |
| + | 53 | <ref name="reports">PeptidePedia Wiki community test-report tally, 2024–2026 (self-reported; see [[Project:Sourcing_guidelines]]).</ref> | |
| 48 | <ref name="ich_q6b">International Council for Harmonisation, ''Q6B: Specifications — Test Procedures and Acceptance Criteria for Biotechnological/Biological Products'' (1999).</ref> | 54 | <ref name="ich_q6b">International Council for Harmonisation, ''Q6B: Specifications — Test Procedures and Acceptance Criteria for Biotechnological/Biological Products'' (1999).</ref> |
| 49 | 55 |