Crude peptide: difference between revisions
Diff·revision 18 → 19·09:40, 3 Jul 2025
Difference between revision 18 and revision 19 of Crude peptide. 5 lines changed; the page grew by 608 bytes.
| Revision 18 — 08:21, 16 Jun 2025 SPPS_Sorrel (talk) add the light-exposure point for photosensitive material 3,938 bytes ±0 | Revision 19 — 09:40, 3 Jul 2025 FreightFenna (talk) give the closure integrity test by name 4,546 bytes +608 | ||
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| 34 | It also bears on identity. A crude containing a high proportion of deletion sequences is a crude in which the main peak is less dominant, and identity confirmation by [[Mass spectrometry|mass]] becomes correspondingly more important rather than less.{{r|usp1503}} | 34 | It also bears on identity. A crude containing a high proportion of deletion sequences is a crude in which the main peak is less dominant, and identity confirmation by [[Mass spectrometry|mass]] becomes correspondingly more important rather than less.{{r|usp1503}} |
| 35 | 35 | ||
| + | 36 | == Crude material in the research market == | |
| + | 37 | Where crude material is offered, the honest description is that it is unpurified. Documentation for such material should say so, and a certificate reporting a high purity figure for something described as crude is internally inconsistent.{{r|usp1503}} | |
| + | 38 | ||
| + | 39 | The reverse risk is more consequential: purified-grade documentation attached to crude material. No analytical determination distinguishes the two by name — the question is simply what the chromatogram shows — which is why an itemised related-substances profile is more informative than a headline figure. | |
| + | 40 | ||
| 36 | == References == | 41 | == References == |
| 37 | {{reflist}} | 42 | {{reflist}} |