منابع مشابه
Differential pulse and square-wave cathodic stripping voltammetry of xanthine and xanthosine at a mercury electrode.
The surface activity of xanthine (Xan) and xanthosine (Xano) at a hanging mercury drop electrode (HMDE) was studied using out-of-phase ac and cyclic dc voltammetry. The results show that Xan and Xano were strongly adsorbed and chemically interacted with the charged mercury surface, which is the prerequisite step for applying the cathodic adsorptive stripping voltammetric determination of such b...
متن کاملChelate Adsorption for Trace Voltammetric Determination of Xanthosine 59-Monophosphate and Xanthosine 59-Diphosphate
Square-wave cathodic adsorptive stripping voltammetry based on adsorptive accumulation is a very sensitive technique for the trace determination of xanthosine 50-monophosphate (50-XMP) and xanthosine 50-diphosphate (50-XDP). The determination is based on the strong interaction of the adsorption of xanthosine phosphate compounds on a mercury electrode surface, forming Hg(II)-xanthate. The cathod...
متن کاملXanthine, xanthosine and its nucleotides: solution structures of neutral and ionic forms, and relevance to substrate properties in various enzyme systems and metabolic pathways.
The 6-oxopurine xanthine (Xan, neutral form 2,6-diketopurine) differs from the corresponding 6-oxopurines guanine (Gua) and hypoxanthine (Hyp) in that, at physiological pH, it consists of a approximately 1:1 equilibrium mixture of the neutral and monoanionic forms, the latter due to ionization of N(3)-H, in striking contrast to dissociation of the N(1)-H in both Gua and Hyp at higher pH. In xan...
متن کاملUltrafast Electronic Deactivation Dynamics of Xanthosine Monophosphate.
Ultrafast energy dissipation is a crucial factor for the photostability of DNA and RNA, but even some of the key electronic deactivation pathways in monomeric nucleic acid building stones are still controversial. Here, we report on the excited-state dynamics of the rare nucleotide xanthosine monophosphate as a function of deprotonation state (XMP vs. XMP - ) and excitation wavelength ( λ pump =...
متن کاملFormation of an adenyl xanthosine monophosphate intermediate by xanthosine 5'-phosphate aminase and its inhibition by psicofuranine.
The amination of xanthosine 5’-phosphate and its inhibition by psicofuranine was examined with substrate amounts of purified xanthosine St-phosphate aminase from Escherichia coli. In the absence of NH,, incubation of the enzyme with adenosine triphosphate-8-i4C and XMP-8J4C for 10 min results in the conversion of ATP to AMP without concomitant formation of guanosine monophosphate. Shorter perio...
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ژورنال
عنوان ژورنال: European Journal of Biochemistry
سال: 2002
ISSN: 0014-2956
DOI: 10.1046/j.1432-1033.2002.03097.x