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Introduction: Due to the concerning increase in resistance to traditional antimicrobial drugs, new therapies to fight antibiotic-resistant microorganisms, such as plant-based compounds and nanoparticles, appear necessary. The goal of this research was to examine the antimicrobial activity of silver nanoparticles synthesized using Lycium ruthenicum extract. Methods & Materials: In this experimental study, Escherichia coli (ATCC25922), Pseudomonas aeruginosa (ATCC27853), Klebsiella pneumoniae (ATCC9997), Staphylococcus aureus (ATCC25923) and Enterococcus faecalis (ATCC29212) were studied. Aqueous extract of L. ruthenicum was prepared. Silver nanoparticles were prepared in combination with L. ruthenicumextract. The MIC of silver nanoparticles was investigated alone and in combination with the L. ruthenicumplant using the broth microdilution method for Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus and Enterococcus faecalis. Results: The nanoparticle synthesized with the aqueous extract of the Lycium ruthenicum plant had a significant inhibitory effect on E. coli, P. aeruginosa, and S. aureus compared to the aqueous extract alone (P<0.05). Also, the highest inhibitory activity of L. ruthenicum extract was for K.pneumoniae and E. faecalis with MIC 2.5 mg / ml. On the other hand, biosynthesized silver nanoparticles against E. coli with MIC 1.25 mg / ml showed the highest inhibitory activity. In general, silver nanoparticles synthesized with L. ruthenicum extract had significant antibacterial effects on the studied bacteria, in comparison with silver nanoparticles by chemical method as well as the plant L. ruthenicum alone. Conclusion: Silver nanoparticles synthesized with L. ruthenicum extract have significant antibacterial effects, which can be used as a suitable treatment option for antibiotics due to the side effects of antibiotics after further studies on animal models. [ABSTRACT FROM AUTHOR] more...

Silene weed plant (Silene conoidea. L) is from from the Caryophyllacea family and its leaf is medicinal and edible. This plant in traditional and modern medicine, is used for treatment of skin infections and blood coagulation and its medicinal properties are attributed to phenolic compounds. In this research, flower, stem, leaf, and root of S. conoidea was collected from Sabzevar in Spring 2022 and their the chemical compositions of chloroform and dichloromethane fractions were reported by GC-MS. In order to prepare fractions of all the organs under the same conditions, petroleum ether was used for defatting, and chloroform and dichloromethane were used to extract the effective phytochemicals through maceration method. GC-MS analysis of chloroform fractions showed that terpene derivatives, phenolic derivatives, hydrocarbons, fatty acids, heterocyclic derivatives, phenylpropanes, silane derivatives and steroids are the main constituent compounds in all organs. Hydrocarbon derivatives (69.16%) in flower, terpene derivatives (40.46%) in stem, and fatty acid derivatives (40.46% and 63.98%) respectively in leaf and root are the most constituent compounds in chloroform fractions. Also, the GC-MS analysis of dichloromethane fractions showed that terpene derivatives (47.62% and 40.53%) in leaf and stem, respectively, and silane derivatives (52.70%) in root are the most constituent compounds. The properties of solvents play an important role in determining the extraction of phytochemical compounds with unique biological properties. In general, the results of this research showed that the non-polar extract of chloroform and the stem of the plant have valuable effective substances, especially terpene compounds, for medicinal purposes. These results suggested that other genetic resources of S. conoidea can be further explored to screen high bioactive compounds and purification of phytochemical compounds which are valuable to produce, expand, and develop natural antioxidants in the production of bio-medicine and food. [ABSTRACT FROM AUTHOR] more...