Naslov
Utilization of a kinetic isotope effect to decrease decomposition of ceftriaxone in a mixture of D2O/H2O

Autori
Jasprica, Ivona ; Horvat, Petar ; Zrnc, Katarina ; Bonney, Karl J. ; Bjornstad, Vidar ; Hok, Lucija ; Vianello, Robert ; Bregović, Nikola ; Požar, Josip ; Leko, Katarina ; Tomišić, Vladislav ; Meštrović, Ernest

Izvornik
European journal of pharmaceutical sciences (0928-0987) 187 (2023); 106461, 18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
β-lactams ; Ceftriaxone ; D2O kinetic isotope effect ; Molecular dynamics simulations ; Quantum-chemical calculations

Sažetak
The discovery of cephalosporin and demonstration of its improved stability in aqueous solution, as well as enhanced in vitro activity against penicillin-resistant organisms, were major breakthroughs in the development of β-lactam antibiotics. Although cephalosporins are more stable with respect to hydrolytic degradation than penicillins, they still experience a variety of chemical transformations. The present study offers an insight into the rates and mechanisms of ceftriaxone degradation at the therapeutic concentration in water, a mixture of water and deuterium oxide, and deuterium oxide itself at the neutral pH. Specific ceftriaxone degradation products were observed in aged samples (including a previously unreported dimer-type species), and by comparing the degradation rates in H2O and D2O, the observation of a kinetic isotope effect provided some valuable insight as to the nature of the initial ceftriaxone degradation. The effect of protium to deuterium isotope change on the degradation kinetics of ceftriaxone was evaluated using the method of initial rates based on HPLC analysis as well as by quantitative 1H NMR spectroscopy. Moreover, computational analysis was utilized to get a molecular insight into chemical processes governing the ceftriaxone degradation and to rationalize the stabilizing effect of replacing H2O with D2O.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti, Farmacija

POVEZANOST RADA