title: Stability study of selected adenosine nucleosides using LC and LC/MS analyses.
abstract: The stability of the naturally occurring nucleoside, adenosine, and two synthetic chlorine-containing analogues, 2-chloroadenosine and 5'-chloro-5'-deoxyadenosine was studied using high performance liquid chromatography (LC) and liquid chromatography in combination with mass spectrometry (LC/MS). The stability of the examined nucleosides over pH range of 2-10 and at temperatures 40, 60 and 80 degrees C was measured using an LC method, whereas the products of hydrolysis were identified using LC/MS. The LC data indicated that the hydrolysis of the nucleosides followed pseudo-first order kinetics. The MS data proved that the fragment ions at m/z 136.3 and 170.3 referred to the hydrolytic products, adenine and 2-chloroadenine, respectively. The calculated values of the hydrolysis rate constant and half-life indicated that the presence of chlorine atom in the nucleoside base moiety increases apparently the stability of 2-chloroadenosine against acid hydrolysis compared to 5'-chloro-5'-deoxyadenosine and adenosine.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Kuwait University, Safat.
authors.forename: M
authors.initials: M
authors.lastname: Abdel-Hamid
authors.forename: L
authors.initials: L
authors.lastname: Novotny
authors.forename: H
authors.initials: H
authors.lastname: Hamza
mesh_terms: D015762:2-Chloroadenosine / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D017338:Cladribine / Q000737:chemistry*; D004355:Drug Stability; D006868:Hydrolysis; D007700:Kinetics; D013058:Mass Spectrometry / Q000379:methods*
chemical_list: D015762:2-Chloroadenosine; D017338:Cladribine; C044739:5'-chloro-5'-deoxyadenosine