Amino acid analysis: difference between revisions
Diff·revision 16 → 17·16:22, 6 Sep 2025
Difference between revision 16 and revision 17 of Amino acid analysis. 5 lines changed; the page grew by 555 bytes.
| Revision 16 — 02:39, 8 Aug 2025 TFA_Counterion (talk) fix a dangling clause 4,068 bytes ±0 | Revision 17 — 16:22, 6 Sep 2025 TFA_Counterion (talk) clarify the difference between related substances and total impurities 4,623 bytes +555 | ||
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| 34 | The practical consequence is that an amino acid analysis result should be read with the hydrolysis conditions in view, and that residues known to be destroyed are simply not evidence either way. A composition report that lists tryptophan at its theoretical value from a standard hydrolysis is reporting something that did not happen. | 34 | The practical consequence is that an amino acid analysis result should be read with the hydrolysis conditions in view, and that residues known to be destroyed are simply not evidence either way. A composition report that lists tryptophan at its theoretical value from a standard hydrolysis is reporting something that did not happen. |
| 35 | 35 | ||
| + | 36 | == Use in peptide certification == | |
| + | 37 | Amino acid analysis appears on peptide certificates less often than purity or water, and more often on custom-synthesis documentation than on catalogue material. Where it appears, it is generally the strongest single determination on the document, because it addresses content directly.{{r|usp1503}} | |
| + | 38 | ||
| + | 39 | Its absence is not evidence of a problem. It is a laborious method, and content can also be established by quantitative nitrogen determination or by chromatographic assay against a qualified standard where one exists. | |
| + | 40 | ||
| 36 | == References == | 41 | == References == |
| 37 | {{reflist}} | 42 | {{reflist}} |