A thin-layer chromatographic method for separation of novobiocin, isonovobiocin and descarbamylnovobiocin using Silufol plates was developed. The method is simple and rapid. It provided clear separation of the components and using of diethyl ether, a simple individual separating solvent. The method allowed determination of novobiocin and the products of its isomerization in the fermentation broth, extracts and dry substances, as well as performance of operative control and regulation of the technological processes of fermentation and chemical purification of novobiocin.
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BMC Chem
January 2025
Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt.
Co-administration of COVID-19 RNA polymerase inhibitors, remdesivir and favipiravir, has synergistic benefits. Together they reduce viral load and inflammation more effectively than either drug used alone. Corticosteroids like dexamethasone are used alongside antivirals in multidrug combination regimens.
View Article and Find Full Text PDFMolecules
December 2024
Plant Protection Institute, HUN-REN Centre for Agricultural Research, Fehérvári út 132-144, 1116 Budapest, Hungary.
Flash column chromatographic fractionation of tree of heaven () stem and trunk bark extracts, guided by thin-layer chromatography (TLC)- assay and TLC-heated electrospray high-resolution tandem mass spectrometry (HESI-HRMS/MS), lead to the isolation of six known compounds: (9,11)-13-hydroxy-9,11-octadecadienoic acid (13-HODE, ), (10,12)-9-hydroxy-10,12-octadecadienoic acid (9-HODE, ), hexadecanedioic acid (thapsic acid, ), 16-hydroxyhexadecanoic acid (juniperic acid, ), 16-feruloyloxypalmitic acid (alpinagalanate, ), and canthin-6-one (). Their structures were elucidated by HESI-HRMS/MS and one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy. This is the first study identifying - in tree.
View Article and Find Full Text PDFDrug Dev Ind Pharm
January 2025
Ramanbhai Patel College of Pharmacy, Charotar University of Science and Technology (CHARUSAT), Anand, India.
Background: Tavaborole (TAV), a benzoxaborole derivative, is an FDA-approved antifungal agent for treating onychomycosis, a common and persistent fungal infection of the toenails.
Objective: This study aimed to develop a robust stability-indicating HPTLC method to determine TAV in nanostructured lipid carriers (NLC) using a comprehensive approach that includes risk assessment, and Analytical Quality by Design.
Methods: The critical method parameters influencing the HPTLC results were screened using a Plackett-Burman screening design followed by its optimization using a central composite optimization design.
J Chromatogr A
December 2024
Freie Universität Berlin, Institut für Chemie und Biochemie, Thielallee 63, 14195 Berlin, Germany.
Analytical thin layer chromatography (TLC) is a simple yet powerful chromatographic technique that is widely used for the qualitative characterization of complex mixtures such as plant extracts. For their qualitative and visual characterisation, a large number of more or less specific colour reactions are at hand and numerous reference substances are available as well. However, the identification of extract components by colour and the comparison of retention times is not straightforward.
View Article and Find Full Text PDFJ Chromatogr B Analyt Technol Biomed Life Sci
December 2024
Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Pharos University in Alexandria, Canal El Mahmoudia Street, Beside Green Plaza Complex 21648, Alexandria, Egypt.
The FDA "Food and Drug Administration" recently approved a novel co-crystal formulation of Celecoxib (CEX) and Tramadol (TRM) for the treatment of adults suffering from moderate to severe pain in several conditions. This novel combination has advantages over co-administration of the two drugs individually as better patient compliance, synergism and lower therapeutic cost. This work presents the first "High performance Thin Layer Chromatographic" (HPTLC) quantitative analytical technique for CEX and TRM simultaneous assay in bulk, their new dosage form and plasma.
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