Chromatographic separation of the chiral drugs rolipram, bupivacaine and omeprazole on a tartardiamide-based stationary phase commercially named Kromasil CHI-TBB is shown in this work. The effect of temperature on the chromatographic separation of the chiral drugs using the Kromasil CHI-TBB stationary phase was determined quantitatively so as to contribute toward the design for the racemic mixtures of the named compound by using chiral columns. A decrease in the retention and selectivity factors was observed, when the column temperature increased. Van't Hoff plots provided the thermodynamic data. The variation of the thermodynamic parameters enthalpy and entropy are clearly negative meaning that the separation is enthalpy controlled.
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http://dx.doi.org/10.1016/j.chroma.2007.07.008 | DOI Listing |
Heliyon
January 2025
Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh.
Thiamine (vitamin B1) and riboflavin (vitamin B2) are essential vitamins because of their important health impact. Twelve different green leafy vegetable-samples including , and indigenous to Shariatpur district in Bangladesh were collected, dried, stored and analyzed. The extraction procedures involved acid hydrolysis followed by enzymatic hydrolysis of the dried vegetable samples.
View Article and Find Full Text PDFAnal Chim Acta
February 2025
Department of Analytical Chemistry, Faculty of Chemistry, Universitat de València, C/ Dr. Moliner 50, 46100, Burjassot, Spain. Electronic address:
Background: Developing analytical methods for Traditional Medicine products by liquid chromatography is challenging due to their chemical complexity and the lack of analytical standards for numerous, unidentified constituents. Regulatory agencies recommend chromatographic fingerprint analysis for quality evaluation, relying on peak detection to ensure resolution. Conventional modelling struggles to optimise experimental conditions for such complex samples.
View Article and Find Full Text PDFBioanalysis
January 2025
Quantitative Pharmacology, Bicycle Therapeutics, Cambridge, MA, USA.
Background: The Bicycle® toxin conjugate (BTC) zelenectide pevedotin, formerly known as BT8009, is a novel bicyclic peptide targeting the Nectin-4 tumor antigen conjugated to the cytotoxin monomethyl auristatin E (MMAE) via a valine-citrulline cleavable linker. Zelenectide pevedotin is currently being investigated in a Phase 1/2 (Duravelo-1, NCT04561362) clinical trial to determine safety and efficacy in patients with tumors associated with Nectin-4 expression. A simple regulated bioanalytical assay was developed to quantify intact zelenectide pevedotin in patient plasma samples.
View Article and Find Full Text PDFBMC Chem
January 2025
College of Food Science and Technology, Hebei Agricultural University, Baoding, 071001, China.
Background: As the common antibacterial drugs in folic acid oral liquid, parabens are listed as mandatory substances in the quality standard. Both the Chinese Pharmacopoeia and the United States Pharmacopoeia use high performance liquid chromatography for the determination of folic acid, but the quantitative methods of parabens are different. Pharmacopoeias use different instruments to quantify folic acid and parabens, resulting in cumbersome and cumbersome detection methods.
View Article and Find Full Text PDFJ Chromatogr A
January 2025
Analytical Chemistry Laboratory, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, Gembloux 5030, Belgium. Electronic address:
The analysis of mineral oil aromatic hydrocarbons (MOAH) in vegetable oils is currently associated with high uncertainty due to various factors ranging from sample preparation to data interpretation. One significant factor is the coelution of biogenic compounds of terpenic origin with the MOAH fraction during chromatographic analysis. The common purification method is epoxidation, a chemical reaction that changes the polarity of the interferences, allowing their separation from MOAH.
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