Vol 8, No 2 (2020)

The aim of the study is to determine the effectiveness of the use of platelet enriched plasma in the complex treatment of chest trauma and chronic pleural empyema.

Materials and methods. The work was performed on 450 male rats, simulated with chest trauma (n=180) and chronic pleural empyema (n=270). In the experimental groups, biostimulation of adhesiogenesis as an intrapleural injection of 1 ml of platelet-enriched plasma was carried out; in the comparison group; the animals with pleural empyema were injected with 1 ml of doxycycline solution; in the negative control groups, the treatment was not carried out at all. Withdrawal from the experiment took place on the 10^th, 20^th, 30^th days. The samples of intrapleural adhesions were fixed in 10% formalin, followed by histological tracing and preparation of micropreparations, staining with hematoxylin and eosin. The morphometric study included determination of the volume fraction (VF) of collagen and reticular fibers; fibrin; inflammatory cells; blood-stream (%).

Results. An intrapleural administration of platelet-rich plasma is an effective way to stabilize the rib cage in chest injuries, and to eliminate residual cavities in chronic pleural empyema. When assessing the severity of the adhesions in chest trauma, it was found out that adhesions are most often visualized at the sites of rib fractures (from 13.3 to 40%). In pleural empyema, during the entire process of observation, the VF of collagen fibers forming adhesions was higher in the group with biological stimulation of adhesiogenesis than in the NCpe group and in the CG. In the PRP group, already at the initial stages of the experiment, this indicator was significantly lower than in the NC and CG (p<0.05).

Conclusion. Based on the data obtained, the effectiveness of the use of platelet-enriched plasma in thoracic surgery for the biological potentiation of adhesiogenesis has been proved in experimental chest injuries and chronic pleural empyema.

42 derivatives of 2’,4’-dihydroxychalcone, flavanone and flavone, containing the hydroxy group in position 7 (ring “A”), as well as substituents in the ring “B”, have been studied.

The aim is to study the quantum-chemical parameters of 2’,4’-dihydroxychalcone, flavanone and flavone derivatives containing a hydroxy group in position 7, in order to identify the effect of substituents on Mulliken charges (a.e) in the aromatic core “A”, bond numbers (Nµ), the unsaturation index (IUA) and the electron density of the carbon atoms of the cinnamoyl fragment.

Materials and methods. The listed above parameters have been calculated by the semi-empirical method PM7 (WinMopac 2016 program) on the workstation with an Intel Xeon E5-1620 3.5 GHz processor, 20 GB of RAM.

Results and discussion. The analysis of the values of quantum-chemical parameters, as well as their comparison with the corresponding indicators presented in Report I, revealed a number of important features associated with the influence of the hydroxy group in position 7 (ring “A”) on the studied quantum-chemical parameters of molecules. It has been established that the hydroxy group in the ring “A” does not significantly affect the Mulliken charge and the electron density of the carbon atoms of the propenone unit C-7→C-8→C-9. On atom C-9 (carbonyl carbon), the Mulliken charge always has a positive value, and the electron density is about 3.4670-3.4840 for all three groups of compounds. The transition from 2’,4’-dihydroxychalcone to flavanone and flavone by the formation of the pyrone heterocycle, is accompanied by an increase in the negative charge on C-8, which can be explained by the involvement of the oxygen heteroatom in the transmission of electronic effects. The hydroxy group in the ring “A”, has practically no effect on the charge and electron density of atoms. An analysis of the values of bond numbers and unsaturation indices suggests that atoms C-1 of 2’,4’-dihydroxychalcone and 7-hydroxyflavanone derivatives, are characterized by the lowest Nµ value; the lowest bond numbers are characteristic for atom C-8 derivatives of 7-hydroxyflavone. Consequently, the primary attack of the HO·radical will be directed at C-1 (in chalcones and flavanones) and at C-8 in flavones.

Conclusion. The performed quantum-chemical calculations make it possible to analyze the effect on the main quantum-chemical parameters of the molecule, which can be useful in predicting the biological activity of flavanoid compounds due to their antiradical effect on reactive oxygen intermediate species (ROIs).

The aim of the study is to review the literature data on the chemical constituents of arial and underground parts of Geum rivale L. (Rosaceae) and the pharmacological activity of its extracts and individual compounds.

Materials and methods. The study was carried out using Internet resources (Google Scholar, PubMed) and library databases (e-Library, Scopus, Web of Science). The main research methods were a review and analysis of the literature data on the topic for the period from 1958 up to the present.

Results. For the period from 1958 up to the present more than 80 components in the arial and underground parts of G. rivale have been identified. Among them there were components of the essential oil, phenolic acids and coumarins, aglycones of flavonoids, including luteolin, apigenin, quercetin and kaempferol, as well as a number of their glycosides and glucuronides, ellagitannins (hemin A, B, C, D, pedunculagin, stachiurin/casuarinin, tellimagrandin I). Some aspects of the pharmacological activity of total extracts and individual secondary metabolites of G. rivale have been studied, anti-inflammatory, antioxidant, antimicrobial, antiviral activities have been experimentally confirmed.

Conclusion. The analysis of the literature data showed that a further study of the composition of metabolites of G. rivale and their pharmacological activity is an urgent task, the solution of which will expand the range of use of this plant in medical practice and consider G. rivale as a promising source of pharmaceutical substances for the creation of new drugs and biologically active additives.