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A reversible isomerization of ceftriaxone in aqueous solution was observed, and the structure of the isomer was determined by mass spectrometry and various 1D and 2D NMR techniques. The mechanism of isomerization was also discussed. Finally, molecular docking simulations were performed and the antimicrobial activities of the isomers were measured. This showed that the biological activity of ceftriaxone was stronger than that of its isomer. The results reported in this article may be important to quality control requirements and to the stability of ceftriaxone products.
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http://dx.doi.org/10.1016/j.jpba.2014.07.040 | DOI Listing |
Biochemistry
September 2025
Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-3965, United States.
d-2-Hydroxyglutarate dehydrogenase (D2HGDH) has recently received considerable attention due to the involvement of d-2-hydroxyglutarate in various medical conditions. This enzyme has been reported to diverge in substrate scope depending on whether its source is prokaryotic or eukaryotic. The D2HGDH from , D2HGDH, is of particular interest due to its requirement for survival via the l-serine biosynthesis pathway and its potential use as a therapeutic target against the bacterium.
View Article and Find Full Text PDFACS Macro Lett
September 2025
School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.
Polyesters are a widely used class of biomaterials thanks to their (bio)degradability and tunable thermomechanical properties. Introducing dynamic disulfide bonds into their backbone enables them to be degraded through different routes and also imparts self-healing properties. However, while numerous polymerization protocols exist with which to introduce disulfide bonds into linear polymers, these methods lack the versatility needed to produce materials with diverse thermomechanical properties.
View Article and Find Full Text PDFChem Sci
September 2025
Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Institute of Modern Optics and Centre of Single-Molecule Science, Nankai University Tianjin 300350 China
The keto-enol tautomerism, involving a reversible isomerization of the molecule, plays a critical role in organic synthesis, biological activity, and molecular-scale charge transport. It is therefore essential to manipulate the process of keto-enol tautomerism. Unlike typical ketones, β-diketones exist dominantly in the enol form and it is a great challenge to realize enol-keto tautomerism due to the formation of intramolecular hydrogen bonds in the enol form.
View Article and Find Full Text PDFActa Crystallogr B Struct Sci Cryst Eng Mater
October 2025
Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russian Federation.
A large family of photosensitive [Co(NH)NO]XY compounds is known to manifest mechanical effects accompanying intramolecular photochemical linkage nitro-nitrito isomerization. A new member of this family, a malonate, [Co(NH)NO]CHO, was synthesized for the first time and shown to be photoinert. The compound appears to be the first photoinert member of the family.
View Article and Find Full Text PDFJ Org Chem
September 2025
Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States.
In this study, we present data on the regioselectivity of aromatic Claisen rearrangements with -substituted benzenes. A variety of gentisic acid, tetralin, and -salicylamide derivatives were synthesized to test the potential of an internal base to direct the regioselectivity of -alkylation. A key mechanistic insight hinges on a reversible [3,3]-sigmatropic rearrangement step, supported by H NMR studies of the isomerization of a to crotyl group.
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