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    In vitro antimicrobial and antibiofilm-forming activities of Origanum munzurense plant extract on some foodborne gram-negative bacteria
    (Tubitak Scientific & Technological Research Council Turkey, 2023) Yalcin, Halil; Zeybek, Esra; Ozkan, Oktay; Kart, Asim
    Plants are an important source for the discovery of antimicrobial formulations due to the many biologically active components they contain. In this study, in vitro antimicrobial and antibiofilm forming activities of ethanolic extract of Origanum munzurense were investigated against some strains of foodborne pathogenic bacteria. To investigate the antimicrobial activity, the minimal inhibitory concentration values against the selected bacteria and antibiofilm-forming activity were tested with the liquid microdilution method and microplate method, respectively. MICs of Origanum munzurense extract against the bacteria tested are 32 mg/mL for Escherichia coli O157: H7 ATCC 35150, 32 mg/mL for Escherichia coli O157: H7 ATCC 43895, 16 mg/mL for Salmonella enteritidis ATCC 13076, 16 mg/mL for Salmonella typhimurium ATCC 700408, 32 mg/mL for S. typhimurium ATCC 14028, and 2 mg/mL for Pseudomonas fluorescens ATCC 13525. Origanum munzurense showed the best antibacterial effect on Pseudomonas fluorescens ATCC 13525 strain. The least antibacterial effect was shown on E. coli O157:H7 ATCC 35150, E. coli O157:H7 ATCC 43895, and Salmonella typhimurium ATCC 14028. Origanum munzurense extract inhibited biofilm formation on Salmonella enteritidis ATCC 13076 strain at a concentration of 16 mg/mL. Antibiofilm formation was not observed for other bacteria. Total phenolic content of Origanum munzurense was 539 mg of gallic acid equivalent (GAE)/L. 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity O.of munzurense extract was determined to be 18 & mu;g/L. In conclusion, Origanum munzurense ethanol extract has a range of antibacterial effects on the selected foodborne pathogenic bacteria and showed antibiofilm-forming activity especially for S. enteritidis ATCC 13076. In addition, the plant has the prominent amount of phenolic content with antioxidant and radical scavenging activity.
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    IN VIVO HEPATOPROTECTIVE EFFECTS OF Hypericum crenulatum BOISS ON NIMESULIDE-INDUCED TOXICITY IN MICE
    (Parlar Scientific Publications (P S P), 2022) Ozkan, Oktay; Ozbey, Caner; Arat, Gonca Donmez; Kart, Asim; Sari, Ismail; Aydemir, Isil
    Plants of Hypericaceae family including many species have been used for the treatment of various dieases such as melancholia, abdominal pain, wound, tumor and oxidative stress in folk medicine. Hypericum crenulatum Boiss is a member of this family and is found throughout Bolkar mount from Meydan Yayla to San Tepe. It is an endemic herbaceous perennial plant. It is aimed to investigate in this study whether this plant specie have a hepatoprotective properties against nimesulide-induced liver injury in mice. According to the results of the study, methanolic extract of Hypericum crenulatum Boiss showed significant differences on serum ALP and liver histopathology. However, serum AST and ALT values, TAS, TOS and OSI were not altered. Hypericum crenulatum Boiss significant improvement Boiss extract at low dose provided a in nimesulide-induced acute liver toxicity. The data indicate that methanolic extract of Hypericum crenulatum Boiss is considered to be effective against liver toxicity.