In this work, we studied intermolecular aqueous clusters of biuret, an important urea derivative. FTIR showed increase in the intensity absorption bands when water molecules are introduced into biuret. X-ray diffraction analysis that introduction biuret structure significantly increases on patterns range from 14 to 65 2˚⊖. Aqueous have also been gas phase by theoretical methods: density functional theory and Atoms Molecules (AIM) using DFT level B3LYP/6–31 + G (d, p). The nature molecular...

Investigations of the structural, morphological and electrical properties multilayer ZnO/TiO2 thin films deposited by sol–gel technique on glass substrate. Sol–gel is a in which compound dissolved liquid order to bring it back as solid controlled manner. TiO2 solution was obtained dissolving 0.4 g nano powder 5 ml ethanol diethylene glycol. ZnO 0.88 zinc acetate 20 2-methoxyethanol. X-ray diffraction (XRD) (PW 3050/60 PANalytical X’Pert PRO diffractometer) results showed that crystallinity...

Titanium dioxide (TiO2) nanoparticles, have been routinely used in cosmetic and sunscreen applications, due to their ability absorb the UV spectrum. Nevertheless, one of main disadvantages has generation reactive oxygen species (ROS), especially hydroxyl radical, upon photoexcitation titania. In this work, we investigate TiO2 nanoparticles doped with 0.6–0.7% manganese (Mn), based more stable rutile polymorph particular, while anatase crystal form destroy almost any organic matter under...

1,3,5-Triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (Triallyl isocyanurate (TAIC)) is an important organic compound that used for cross-linking to produce polymers and polymer composites. In this work, TAIC was studied in various solvents (water (W), Tetrahydrofuran (THF), Dimethyl sulfoxide (DMSO), acetonitrile (ACN)) using a complex of theoretical (B3LYP/6-311++G(d,p)) experimental methods. particular, the following were used: Experimental Theoretical Vibrational Spectroscopy, Molecular...

Hydroxyethyl urea is an important derivative that finds wide application in various fields from cosmetics to a component of low-freezing batteries. In all areas its application, special attention paid non-covalent interactions with water. this work, we investigated the hydroxyethyl water, and also obtained studied crystal hydrate substance. The hydrates were by experimental theoretical methods. Thus, introduction water molecules into hydroxyethylurea leads broadening peaks characteristic...

Aptamers are synthetic single-stranded oligonucleotides that exhibit selective binding properties to specific targets, thereby providing a powerful basis for the development of and sensitive (bio)chemical assays. Electrochemical biosensors utilizing aptamers as biological recognition elements, namely aptasensors, at forefront current research. They exploit combination unique with advantages electrochemical detection view fabricate inexpensive portable analytical platforms rapid in...

Abstract Urea and its derivatives play a significant role in modern organic chemistry find application various fields. This study presents the results of investigations N-methylurea crystalline hydrates. Initial hydrates have been examined by FTIR spectroscopy X-ray diffraction analysis. It has found that incorporation water molecules into crystals leads to shift intensity peaks both spectra patterns. Methylurea gaseous phase additionally explored within density functional theory at...

Abstract Alkylated urea derivatives have found wide application as starting materials for the production of many drugs, including anticancer well in other areas. In this work, we studied ethylurea crystalline hydrates using a complex theoretical and experimental methods. The nature intermolecular interactions between water molecules is investigated topological analyses such atoms (AIM), non-covalent interaction (NCI), reduced density gradient (RDG), electron localized functions (ELF),...

Background: It is well known that quantum dot-sensitized solar cells based on nanostructured semiconductor films are considered as a promising alternative to silicon-based cells. The aim of this paper investigate the structural and morphological properties CdS/CdSe dot sensitized photoanodes nanocrystalline TiO2 thin considering their performance can reach an efficiency 2.7%. Methods: were prepared fluorine tin oxide (FTO) glass via chemical route using commercial Degussa 25 crystallized at...

Imidazole derivatives have found wide application in organic and medicinal chemistry. In particular, benzimidazoles proven biological activity as antiviral, antimicrobial, antitumor agents. this work, we experimentally theoretically investigated N-Butyl-1H-benzimidazole. It has been shown that the presence of a butyl substituent N position does not significantly affect conjugation structural organization benzimidazole. The optimized molecular parameters were performed by DFT/B3LYP method...

The physicochemical properties of binary systems are great importance for the application latter. We report on investigation an ammonium sulfamate–urea system with different component ratios using a combination experimental (FTIR, XRD, TGA/DSC, and melting point) theoretical (DFT, QTAIM, ELF, RDG, ADMP, etc.) techniques. It is shown that, at temperature 100 °C, under study remains thermally chemically stable up to 30 min. was established X-ray diffraction analysis that heating time barely...

An electrochemical aptasensor for the detection of tetracycline (TET) is prepared based on a methylene blue (MB)-tagged DNA aptamer, with sequence 5′-MB-CCC CCG GCA GGC CAC TTG GGTTGG TCC TGC GCG-thiol-3′. The aptamer chemisorbed gold electrode and differential pulse voltammetry (DPV) utilized detection. In particular, upon binding TET purpose-designed there an increase in current intensity, as result increased proximity MB molecule to surface. sensor tested using aqueous samples spiked...

Aptamers are synthetic single stranded oligonucleotides that exhibit selective binding properties to specific targets, thereby providing as powerful basis for the development of and sensitive (bio)chemical assays, such biosensors. Electrochemical biosensors, utilizing aptamers biological recognition elements, namely aptasensors, at forefront current research. They exploit combination unique with advantages electrochemical detection view fabricate inexpensive portable analytical platforms...

Sulfated polysaccharides are important promising biologically active substances with anticoagulant properties. Biological activity is affected by the method of preparation, as well type polysaccharide and its molecular structure. In this work, we have considered various methods for synthesis anticoagulants – sulfates using example obtaining agarose sulfate. We compared sulfating agents: chlorosulfonic acid, sulfamic activators, a deep eutectic solvent mixture acid urea (in melt). It has been...

Massive use of antibiotics in veterinary medicine has led to their accumulation meat and dairy products. Consumption antibiotic-contaminated food can trigger the development antibiotic-resistant bacteria, endangering human lives. Among antibiotics, oxytetracycline (OTC) family is most widely used medicine. Strict control necessitates fast effective methods for OTC detection, instance, milk. One promising approaches detection based on specially designed DNA aptamers. These aptamers are...

This paper reviews some of the most common surface modification approaches in biosensing based on self-assembled monolayers with a particular focus Au film thiolation and SiO2 silanization.Such are routinely used to alter materials' properties towards desired bioresponse.Furthermore, appropriate characterization methods ensuring successful presented including XPS, HREELS, SPFS, Raman FTIR spectroscopy as well UPS specific examples demonstrate their importance.In addition, mechanisms...