Structural determination of four manufacturing impurities of D&C Red No. 33
Published 2021. This article is a U.S. Government work and is in the public domain in the USA.
| Veröffentlicht in: | Magnetic resonance in chemistry : MRC. - 1985. - 59(2021), 11 vom: 05. Nov., Seite 1107-1115 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
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| Zugriff auf das übergeordnete Werk: | Magnetic resonance in chemistry : MRC |
| Schlagworte: | Journal Article D&C Red 33 NMR assignment azo dyes food dyes structure elucidation |
| Zusammenfassung: | Published 2021. This article is a U.S. Government work and is in the public domain in the USA. Four manufacturing impurities of D&C Red No. 33 isolated by counter-current chromatography were analyzed by NMR and ESI mass spectrometry. Three of these impurities were reported previously with minimal details of structural determination. All four are structurally related to the main component of the dye. The fourth exhibited an unusual discrepancy between the NMR structure and its chemical formula suggested by ESI-MS results. Structural determination and assignment of the main component and four impurities are discussed as well as resolution of the discrepancy between the NMR and ESI-MS results of the fourth impurity |
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| Beschreibung: | Date Completed 25.10.2021 Date Revised 25.10.2021 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1097-458X |
| DOI: | 10.1002/mrc.5160 |