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The essential oils of seeds, peels, and leaves from Limnocitrus littoralis(Miq.) Swingle growing wildly on the southcentral coast of Vietnam were extracted by hydrodistillation method. The yields of the oils were recorded. The organoleptic and physicochemical properties of the oils were defined and evaluated according to international standards at 25 °C. A total of forty-three, fifty, and sixty-five components of these oils were analysed and identified, respectively. Major constituents in the seed oil were β-pinene (3.7%, Quang Ngai; 24.0%, Ninh Thuan), β-myrcene (11.1%, Quang Ngai; 59.2%, Ninh Thuan), o-cymene (57.7%, Quang Ngai), and limonene (18.5%, Quang Ngai; 94.5%, Phu Yen; 8.5%, Ninh Thuan). Major constituents in the peel oil included α-pinene (11.3%, Ninh Thuan), β-pinene (3.9%, Quang Ngai; 62.6%, Ninh Thuan), and limonene (54.0%, Quang Ngai; 94.0%, Phu Yen; 3.5%, Ninh Thuan). Major constituents in the leaf oils consisted of β-pinene (36.4%, Ninh Thuan), β-myrcene (38.0%, Quang Ngai; 28.9%, Ninh Thuan), and limonene (17.3%, Quang Ngai; 93.2%, Phu Yen). This research highlighted the aromatic value of bearing oil plants growing wildly on the Southcentral coast of Vietnam.

AbstractThe essential oils from peels and leaves of Citrus clementineHort. ex Tan. were extracted via two methods: conventional hydrodistillation (CHD) and microwave-assisted hydrodistillation (MAHD). Their physicochemical properties were investigated. Their chemical compositions of the oils were determined by GC/FID and GC/MS. A total of forty-one and seventy-seven compounds of the total essential oil composition of the peels and leaves respectively were identified. The peel oils were dominated by monoterpene hydrocarbons in which limonene was the main component (95.48% [CHD], and 95.03% [MAHD]). The leaf oils were also dominated by sesquiterpene hydrocarbons with sabinene (26.02% [CHD], and 19.52% [MAHD]), β-elemene (10.50% [CHD], and 18.04% [MAHD]), linalool (9.88% [CHD], and 7.51% [MAHD]), (E)-β-ocimene (5.87% [CHD], and 5.00% [MAHD]), β-caryophyllene (4.04% [CHD], and 7.49% [MAHD]), and δ-selinene (4.76% [CHD], and 8.02% [MAHD]) as major components. The oil contents of peels were obtained with 5.31% and 5.67% by CHD method and MAHD method, respectively. The oil contents of the leaves were obtained with 0.33% and 0.20% by CHD method and MAHD method, respectively. The antimicrobial activity (disc diffusion antibiotic sensitivity assay) of the oils was investigated against six reference test organisms including two Gram (+) bacteria (Bacillus subtilis, Staphylococcus aureus), three Gram (-) bacteria (Escherichia coli, Pseudomonas aeruginosa, Shigella flexneri), and one fungus (Candida albicans).

AbstractThe chemical composition of the curry leaf essential oils obtained from curry trees growing in the South of Vietnam was studied for the first time. Two methods of extraction were used, conventional hydrodistillation (CHD) and microwave-assisted hydrodistillation (MAHD), thus leading consequently to the isolation of two oils of moderately different composition. The oils were obtained in the yields of 0.83 % and 0.39 % by CHD (480 minutes) and MAHD (50 minutes), respectively. The main chemical compositions of the oils were completely dominated by hydrocarbons. The extracted oils were determined by GC/FID and GC/ MSD to contain 76 and 62 identifiable components for the CHD and the MAHD methods, respectively. The oil extracted by MAHD displayed a higher anti-microbial activity than the oil extracted by means of CHD.