A novel electrochemical sensor has been fabricated using Co doped CeO2 nanoparticles for selective and simultaneous determination of xanthine (XA), hypoxanthine (HXA) and uric acid (UA) in a phosphate buffer solution (PBS, pH 5.0) for the first time. The Co-CeO2 NPs have been prepared by microwa...
Hypoxanthine (Hx) is a major DNA lesion generated by deamination of adenine during chronic inflammatory conditions, which is an underlying cause of various diseases including cancer of colon, liver, pancreas, bladder and stomach. There is evidence that deamination of DNA bases induces mutations,...
A selective biosensing platform for the determination of hypoxanthine (Hx) and uric acid (UA) concentrations in both buffer and human serum sample solutions was developed. The biosensor features the layer-by-layer (LbL) self-assembly of negatively charged xanthine oxidase (XOD) and positively ch...
In this work, a ratiometric electrochemiluminescence (ECL) biosensor was constructed for testing hypoxanthine (Hx). The reduced graphene oxide-CdTe quantum dots (rGO-CdTe QDs) and luminol were chose as the cathodic and anodic probes, the reactant (dissolved O2) and the product (H2O2) in enzymati...
Sedimentation equilibrium and size-exclusion chromatography experiments on Mycobacterium tuberculosis hypoxanthine-guanine phosphoribosyltransferase (MtHGPRT) have established the existence of this enzyme as a reversibly associating mixture of dimeric and tetrameric species in 0.1 M Tris-HCl−0.0...
The amino-functionalized metal organic framework (NH2-Cu-MOF) was fabricated via bottom-up synthesis strategy. Detailed characterization using electron microscopy, X-ray photoelectron spectroscopy and atomic force microscopy demonstrated that the as-synthesized NH2-Cu-MOF was two-dimensional nan...
A xanthine oxidase (XOD) from buttermilk was immobilized covalently onto boronic acid functionalized gold coated iron nanoparticles ([email protected]) electrodeposited on pencil graphite (PG) electrode, via the boroester linkages, between free hydroxyl groups of boronic acid, α-COOH and –NH2 ...
Endothelial cell injury and dysfunction caused by reactive oxygen species (ROS) are implicated in the pathogenesis of vascular diseases. ROS are generated and hypoxanthine is degraded by xanthine oxidase. Smoking and alcohol consumption are associated with an increased level of hypoxanthine. We ...
Zebrafish, one of the preferred study species of geneticists, is gaining increasing popularity in behavioral neuroscience. This small and prolific species may be an excellent tool with which the biological mechanisms of vertebrate brain function and behavior are investigated. Zebrafish has been ...
The title bis(purin-6-yl)acetylenes, -diacetylenes, -ethylenes and -ethanes were prepared as covalent base-pair analogues starting from 6-ethynylpurines and 6-iodopurines by cross-coupling and homo-coupling reactions and hydrogenations. The bis(purin-6-yl)acetylenes and -diacetylenes exhibited s...
Treatment of a dichloromethane solution of 9-benzyl or 9-phenyl 6-iodopurine with ethereal ethylmagnesium bromide at ambient temperature gives the corresponding purin-6-yl magnesium halides. Addition of an aldehyde followed by heating at 100 °C in a microwave reactor yielded the corresponding c...
The chemical modification of bovine pancreatic ribonuclease A by 6-chloropurine riboside was studied to obtain information about the role of the purine nucleoside moiety of the ribonucleic acid in the enzyme-substrate interaction. The residues involved in the reaction were identified, after perf...
A benzoyl group was introduced onto the 3′-hydroxyl group of 6-chloropurine riboside by treatment with benzoylating agents in the presence of an organic or inorganic base in aqueous solution, in which further reaction gave 6-chloropurine 2′,3′-di-O-benzoylriboside.
Purine derivatives bearing a secondary or tertiary alkyl group at the 6-position can be conveniently prepared by CuI mediated reaction of secondary or tertiary Grignard reagents with 9-substituted 6-chloropurines under very mild conditions.
Dihydroisoxazole 6-chloropurine and adenine were efficiently prepared via 1,3-dipolar cycloaddition reaction of a nitrile oxide with vinyl 6-chloropurine, and found to be moderately effective against HIV-1 in acutely infected primary human lymphocytes.
Fully deprotected oligodeoxynucleotides containing 6-chloropurine have been synthesized and used in solution phase reactions with amine nucleophiles to prepare oligonucleotides containing substituted adenine residues. This strategy was used for the preparation of a double-stranded oligonucleotid...
9-Norbornyl-6-chloropurine (NCP) is a representative of a series of antienteroviral bicycle derivatives with selective cytotoxicity towards leukemia cell lines. In this work we explored the mechanism of the antileukemic activity of NCP in T-cell lymphoblast cells (CCRF-CEM). Specifically, we sea...
ContextIn recent years phosphodiesterase V acts as an attractive target for cardiovascular drug design and QSAR techniques are helpful for the optimization of structural requirements for designing novel compounds.
The reaction of 1-(methylaminomethyl)silatrane with Ph3CCl in the presence of base leads to the formation of 1-[(N-methyl-N-tritylamino)methyl]silatrane 1. Recrystallization of this silatrane from benzene/heptane (10:1) led to the formation of the solvate complex Ph3C(Me)NCH2Si(OCH2CH2)3N·C6H6,...
Human melanin-concentrating hormone receptor 1 (hMCHR1) antagonists are promising targets for obesity treatment. We identified the tetrahydronaphthalene derivative 1a with modest binding affinity for hMCHR1 by screening an in-house G protein-coupled receptor (GPCR) ligand library. We synthesized...
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