Chemical Characterization and Biological Potential of the Essential Oil of Eucalyptus globulus Labill

Oxidation of lipids in various products,along with the growth of medically important pathogens,has led to a search for medicinal plants with antioxidant and antimicrobial activities.As a result,the aim of this study was to evaluate the antioxidant and antibacterial activity of the essential oil of Eucalyptus globulus(EO-Eg).Antioxidant activity was assessed by using the 2,2-diphenyl-1-picrylhydrazyl hydrate(DPPH)assay method.Existing components were identified through gas chromatography-mass spectrometry(GC-MS)analysis.Antibacterial activity and minimum inhibitory concentration(MIC)were assessed by using the broth microdilution method with standard multidrug-resistant bacterial strains.The main EO-Eg compounds identified by GC-MS were isopulegol,citronellal,and citronellol,which are primarily used in the industrial sectors.EO-Eg demonstrated excellent antioxidant activity with an effective concentration(EC50)of 4.48μL/mL owing to the presence of phenolic compounds.Regarding antibacterial activity,the EO-Eg displayed a broad antimicrobial spectrum of antimicrobial activity across the different resistance phenotypes analyzed.The most notable antibacterial activity was observed against Staphylococcus aureus 169 MRSA(MIC=0.0625%).As a result,our findings suggest that EO-Eg has antioxidant and antibacterial potential against hospital-acquired multidrug-resistant pathogens,which may be correlated with its major components.

Electrochemical Evaluation of Aminoguanidine Hydrazone Derivative with Potential Anticancer Activity:Studies of Glassy Carbon/CNT and Gold Electrodes Both Modified with PAMAM

Aminoguanidine hydrazones (AGHs) are a class of compounds that have interesting pharmacological activities. They are derived from the same chemical group as aminoguanidine, so it has mixed properties (receptor and donor) in the formation of hydrogen bonds. Its anticancer agent properties were recently highlighted, but the molecules of this class have solubility in aqueous solutions that can be considered low. The identification of this class, by a simple, sensitive and low-cost technique, such as electrochemistry, which also allows the evaluation of its solubilization process through agents such as PAMAM dendrimer is the main objective of the work described here. The electrochemical response of the LQM10 (AGH derivative) was evaluated, as well as its behavior in different electrochemical sensors. Electrochemical experiments were performed in buffered (phosphate at pH 7.02 and acetate at 4.5). LQM10 has a reversible oxidation peak with a potential of +0.22 V. It was efficiently detected in different electrodes tested (glass carbon/CNT, glass carbon/CNT/PAMAM), which proves the viability of the electrodes for various analyses and has the determination of the apparent constant association, indicating its interaction with the analysis that is higher in the presence of the PAMAM encapsulating agent. This was corroborated by the results for the modified gold electrode with MUA and PAMAM. The sum of the results shows the possibility of electrochemically evaluating the Aminoguanidine hydrazone derivative, the viability of electrodes employed and the greater solubilization of LQM10 in the presence of the PAMAM dendrimer.

Suitability of Suluu-Terek Basalt Deposits for Stone Casting

This article is presenting history of stone casting and analysis of basalt raw materials assessment from other countries for stone casting technology and various basalts compositions were considered. Analytical methods for calculating composition of charge require a long calculation time and plotting diagrams, each method has its own advantages and disadvantages. As a research significance, we have proposed an experimental calculation method for calculating raw materials after charging. Analysis of the composition, structure of basalts and charging materials were used in the stone casting technology. According to the comparison method, the required amount of charging materials was calculated for the Suluu-Terek 1, Suluu-Terek 2 and Berestovetsk deposits. The calculated data was confirmed by experimental melts in the process of stone casting.

C60 fullerene enhances cisplatin anticancer activity and overcomes tumor cell drug resistance

We formulated and analyzed a novel nanoformulation of the anticancer drug cisplatin （Cis） with C60 fullerene （C60＋Cis complex） and showed its higher toxicity toward tumor cell lines in vitro when compared to Cis alone. The highest toxicity of the complex was observed in HL-60/adr and HL-60/vinc chemotherapy- resistant human leukemia cell sublines （resistant to Adriamycin and Vinculin, respectively）. We discovered that the action of the C60＋Cis complex is associated with overcoming the drug resistance of the tumor cell lines through observing an increased number of apoptotic cells in the Annexin V/PI assay. Moreover, in vivo assays with Lewis lung carcinoma （LLC） C57BL/6J male mice showed that the C60＋Cis complex increases tumor growth inhibition, when compared to Cis or C60 fullerenes alone. Simultaneously, we conducted a molecular docking study and performed an Ames test. Molecular docking specifies the capability of a C60 fullerene to form van der Waals interactions with potential binding sites on P-glycoprotein （P-gp）, multidrug resistance protein 1 （MRP-1）, and multidrug resistance protein 2 （MRP-2） molecules. The observed phenomenon revealed a possible mechanism to bypass tumor cell drug resistance by the C60＋Cis complex. Additionally, the results of the Ames test show that the formation of such a complex diminishes the Cis mutagenic activity and may reduce the probability of secondary neoplasm formation. In conclusion, the C60＋Cis complex effectively induced tumor cell death in vitro and inhibited tumor growth in vivo, overcoming drug resistance likely by the potential of the C60 fullerene to interact with P-gp, MRP-1, and MRP-2 molecules. Thus, the C60＋Cis complex might be a potential novel chemotherapy modification.