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The chemical composition of  Porella arboris-vitae  extracts was determined by solid phase microextraction, gas chromatography-mass spectrometry (SPME GC-MS), and 66 constituents were identified. The dominant compounds in methanol extract of  P .  arboris-vitae  were   β  -caryophyllene (14.7%),   α  -gurjunene (10.9%),   α  -selinene (10.8%),   β  -elemene (5.6%),   γ  -muurolene (4.6%), and allo-aromadendrene (4.3%) and in ethanol extract,   β  -caryophyllene (11.8%),   α  -selinene (9.6%),   α  -gurjunene (9.4%), isopentyl alcohol (8.8%), 2-hexanol (3.7%),   β  -elemene (3.7%), allo-aromadendrene (3.7%), and   γ  -muurolene (3.3%) were the major components. In ethyl acetate extract of  P .  arboris-vitae , undecane (11.3%),   β  -caryophyllene (8.4%), dodecane (6.4%),   α  -gurjunene (6%), 2-methyldecane (5.1%), hemimellitene (4.9%), and D-limonene (3.9%) were major components. The antimicrobial activity of different  P .  arboris-vitae  extracts was evaluated against selected food spoilage microorganisms using microbroth dilution method. The Minimal Inhibitory Concentration (MIC) varied from 0.5 to 1.5 mg/mL and 1.25 to 2 mg/mL for yeast and bacterial strains, respectively. Significant morphological and ultrastructural alterations due to the effect of methanolic and ethanolic  P .  arboris-vitae  extracts on  S . Enteritidis have also been observed by scanning electron microscope and transmission electron microscope, respectively. The results provide the evidence of antimicrobial potential of  P .  arboris-vitae  extracts and suggest its potential as natural antimicrobial agents for food preservation.

Antimicrobial Potential and Chemical Characterization of Serbian Liverwort (Porella arboris-vitae): SEM and TEM Observations