MCD spectroscopy and TD-DFT calculations of a naphthalene-ring-bridged coplanar binuclear phthalocyanine dimer

Magnetic circular dichroism (MCD) spectroscopy and TD-DFT calculations are used to analyze the electronic structure and optical properties of an alkyl-substituted naphthalene-ring-bridged coplanar binuclear phthalocyanine dimer. An analysis of the MCD spectrum of the naphthalene-ring-bridged dimer relative to those of benzene-bridged compounds reported previously, demonstrates that there is a significantly weaker interaction between the two phthalocyanine rings. TD-DFT results obtained using the B3LYP functional with 6–31G basis sets were found to be problematic. Closer agreement with the experimental data is obtained when the CAM-B3LYP functional is used instead. The naphthalene-ring-bridged compound is found to be unsuitable for use as a photosensitizer for the formation of singlet oxygen, because the ΦT values are negligible

Subphthalocyanines as electron mediators in biosensors based on phenol oxidases

The electron mediator properties of three subphthalocyanines (SubPcs) [hexa-chloro boron subphthalocyanine (ClSubPc), tri-tert-butyl boron subphthalocyanine (t-BuSubPc) and hexa-phenoxy boron subphthalocyanine (PhOSubPc)] in Tyrosinase and Laccase biosensors (deposited on ITO glass) for the detection of catechol and hydroquinone were evidenced. A particularly remarkable performance was observed in the PhOSubPc-Tyr sensor, which takes account of the π-π interactions between subphthalocyanine rings and the active sites of the enzymes. Mediated electron transfer between redox enzymes and the ITO electrode improved the limits of detection by one order of magnitude, reaching 10−7 mol·L−1 values. Studies at increasing scan rates confirmed the improvement of the charge transfer rates caused by the presence of the SubPcs. A bioelectronic tongue formed by an array of the SubPc based biosensors has been able to discriminate red wines according to their Total Polyphenol Index.2020-07-102020-07-1

Research of Toxicity of Chitosan-based Film-forming Compositions

The object of research is chitosan-based film-forming compositions with the addition of decoctions from medicinal plants: Sweet flag, Senegalia catechu, Ledum, Bergenia crassifolia; Common yarrow, Eucalyptus globulus, Eleutherococcus senticosus, Hypericum perforatum; Chamaenerion angustifolium, Iceland moss, Calendula officinalis, Urtica; Peppermint, Potentilla alba, Common tansy, Plantago major; Artemisia absinthium, Motherwort, Sage, Common sunflower.Medicinal herbs have biological activity (toxicity), which accompanies the main therapeutic effect and depends on the dose. Toxicity is not observed in all medicinal herbs, but among them there are strong and even poisonous. Presented in the composition, medicinal herbs based on 2 % chitosan are not studied for toxicity, therefore, to establish the safety of their use as a packaging for fruit and vegetables, this must be done.The developed compositions are examined for:1) toxicity using bacteriological methods by sowing on 5 % blood agar;2) manifestation of hemolysis zones and growth of B.cereus culture by diffusion into agar (well method).During the research, positive results are obtained:1) all samples are not toxic;2) hemolysis zones are not identified;3) there is a suppression of the growth of B.cereus culture, which grew on the surface of blood agar (growth retardation zones of culture B.cereus 0–34 mm).Further expansion of the study will allow the use of chitosan-based film-forming compositions that have differentiated properties with respect to solubility, sorption, bactericidal and antioxidant effects as a factor in increasing the biological value of food in the absence of toxicity in fruit and vegetable products

Synthesis and investigation of spectral and electrochemical properties of alkyl-substituted planar binuclear phthalocyanine complexes sharing a common naphthalene ring

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EVALUATION OF THE FUNCTIONAL STATUS OF THE RUSSIAN POPULATION OF PATIENTSWITH RHEUMATOID ARTHRITIS ACCORDING THE DATA OF THE RAiSeR STUDY

Objective. To evaluate the functional status of patients with rheumatoid arthritis (RA) in Russia, to compare the distribution and associations between functional insufficiency (FI) and functional class (FC), as well as disability groups (DG), and to consider their impact of a number of the patients' demographic, social, and clinic characteristics. Methods. Rheumatologists from 27 cities and towns of Russia (a total of 30 centers) participated in the cross-sectional epidemiological study. The study included all patients with valid rheumatoid arthritis, who had consecutively turned to a polyclinic rheumatologist or who had been treated at hospital for 3 months. The demographic and social characteristics of a patient, his/her occupation, the onset and duration of RA, DG and a reason for its receiving, and the patient's clinicofunctional status at the study were recorded. Results. A total of 1504 patients, including 1271 women, were examined; their mean age was 53 years; the mean duration of the disease was 10.5 years; 80.4% were seropositive for rheumatoid factor; 94.3% patients had erosive arthritis (X-ray stages II-IV RA). High disease activity scores (DAS) were found; the mean DAS [Mean (SD)] was 5.44±1.18. Severe extraarticular manifestations were identified in 10% of cases. 63% of the RA patients were in FC III and IV; 67% had grades 2 and 3 FI, and 44.5% had DGs I and II. An association was found between FC and FI (r = 0.43; p < 0.0001), DG (r = -0.396;