Chemical composition, antimicrobial and antioxidant activities of the essential oil and the ethanol extract of Cleistocalyx operculatus (Roxb.) Merr and Perry buds.
In the present study, the essential oil isolated from the buds of Cleistocalyx operculatus by hydrodistillation was analyzed by GC and GC/MS. A total of 55 compounds representing 93.71% of the oil were identified. The oil significantly inhibited the growth of food spoilage (FS), food-borne (FB), skin pathogens (SP), methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococci (VRE) and multiantibiotic-resistant bacteria (MARB). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of the oil against the tested microorganisms were found in the range of 1-20muL/mL. Whereas the ethanol extract exhibited potential antibacterial activity against the entire tested Gram positive bacteria and one food spoilage Gram negative bacterium P. aeruginosa. The MIC and MBC values of ethanol extract against the tested bacteria were found in the range of 0.25-32mg/mL. The scanning electron microscopic (SEM) studies demonstrated potential detrimental effect of the essential oil on the morphology of MRSA-P249 and VRE-B2332 at the used MIC values, along with the potential effect on cell viabilities of the tested bacteria. Moreover, the total antioxidant capacity and the scavenging effect on 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals of the essential oil and the ethanol extract were also evaluated.
Department of Biotechnology, Daegu University, Gyeongsan 712-714, Republic of Korea.
Nguyen Thi
NT
Dung
Jung Min
JM
Kim
Sun Chul
SC
Kang
D000890:Anti-Infective Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D001713:Biphenyl Compounds; D024901:Drug Resistance, Multiple, Bacterial / Q000187:drug effects; D000431:Ethanol / Q000737:chemistry; D005516:Food Microbiology; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D008401:Gas Chromatography-Mass Spectrometry; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects / Q000648:ultrastructure; D008826:Microbial Sensitivity Tests; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D012867:Skin / Q000187:drug effects / Q000382:microbiology; D012997:Solvents; D027842:Syzygium / Q000737:chemistry*; D020713:Vancomycin Resistance / Q000187:drug effects
D000890:Anti-Infective Agents; D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D009822:Oils, Volatile; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D000431:Ethanol; C004931:1,1-diphenyl-2-picrylhydrazyl