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Ultima descărcare din IBN: 2023-11-17 19:48 |
SM ISO690:2012 CAZACU, Maria, MORAR, Ana, DONICI, Elena, UNCU, Livia. Application of thin-layer chromatography in accelerated degradation studies of combined eardrops. In: Revista de Ştiinţe ale Sănătăţii din Moldova, 2022, nr. 3 An.1(29), p. 481. ISSN 2345-1467. |
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Revista de Ştiinţe ale Sănătăţii din Moldova | ||||||
Numărul 3 An.1(29) / 2022 / ISSN 2345-1467 | ||||||
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Pag. 481-481 | ||||||
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Background. The TLC method is successfully used in stability studies; it is accessible and ensures the identification of possible degradation products, being particularly useful for testing of combined pharmaceutical formulations. Objective of the study. Study of the accelerated degradation process of combined eardrops with Isohydrofural (IHF) and Methyluracil (MU) by TLC. Material and Methods. Experimental ear drops subjected to accelerated degradation; chromatographic chamber; mobile phases: chloroform-acetone (70:30), 1-butanol-diethyl-ether-acetone (10: 85:5), ethylacetate-hexane (2:1), glacial acetic acid-water-butanol (1:1:4), chloroform-methanol-glacial acetic acid (90:8:8), chloroform-methanol-glacial acetic acid (95:10:2); UV lamp; developing reagents. Results. Chromatography results showed that only the mobile phase ethyl acetate-hexane (2:1) provides the possibility of simultaneous detection of both substances, which is used in the qualitative analysis of the compounds in the mechanical mixture and pharmaceutical form in the accelerated degradation process (thermal, oxidative, hydrolytic and UV stress conditions). Degradation products of IHF (Rf = 0.24) and MU (Rf = 0.51) were determined following oxidation and exposure to temperature. The Rf values of the substances in the mechanical mixture and pharmaceutical form were close (0.37 for IHF and 0.72 for MU). Conclusion. The technique developed for the TLC determinations ensures separation of components in the combination and detection of degradation products. |
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Cuvinte-cheie TLC, degradation, combined eardrops, CSS, degradare, picături auriculare combinate |
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