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This study aims to investigate the chemical composition, antioxidant, and antimicrobial activity of  Citrus aurantium  L zest essential oil. The identification of the chemical compounds was done using chromatography analysis. The antioxidant activity was studied by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay. Results showed that the main components of the essential oil were limonene (85.22%), β-myrcene (4.3%), and α-pinene (1.29%). Regarding the DPPH radical scavenging ability, the zest essential oil showed higher activity than limonene. The antimicrobial activity of the essential oil against pathogenic [ Staphylococcus aureus  NBIMCC 3703,  Salmonella  sp. (clinical isolate),  Pseudomonas aeruginosa  NBIMCC 1390,  Bacillus subtilis  NBIMCC 1208,  Escherichia coli  NBIMCC 3702] microorganisms by disc-diffusion method was examined. Gram-positive bacteria were more sensitive to the oil (inhibition zones being between 9 and 12.5 mm) and the minimum inhibitory concentration was more than 600 ppm; Gram-negative bacteria were less sensitive. The obtained essential oil displayed promising results for its application as a biopreservative agent.

zeitschrift für naturforschung c

Chemical composition, antioxidant activity and antimicrobial activity of essential oil from   Citrus aurantium   L zest against some pathogenic microorganisms