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The essential oils (EOs) was extracted from Persian lime (Citrus latifolia) peels collected in Hau Giang province, Vietnam. Volatile compositions of EOs obtained by three extraction methods of hydrodistillation (HD), steam distillation (SD) and microwave extraction (ME) were analyzed and compared. The volatile compounds in EOs were analyzed based on gas chromatography-mass spectrometry (GC-MS). An amount of 3 ml/g, 2.3 ml/g and 4 ml/g of EOs was obtained from HD, SD and ME with twenty-one compounds were identified, accounting for 99% -100% of the total oil content. Limonene, β-pinene, α-pinene, γ-Terpinene, α-citral, β-citral and Sabinene are the major compound in essential oil. However, there were qualitative and quantitative differences between oil samples obtained by the three extraction methods. The difference is probably due to the influence of different environmental factors and specific characteristics of each extraction method. The results of this study will provide information on the content and chemical composition of Lemon peels. C. latifolia and serve as a stepping stone for further research into the applications of the compound to cosmetic, food and pharmaceutical products.

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Since the industrial economic development, natural compounds have received much attention and study in recent years. Essential oils (EOs) that contain many volatile constituents and aromatic compounds have been around for a long time but are still considered today due to their natural characteristics and unique application. In this study, the leaves of Calamondin (Citrus microcarpa) shells were used to investigate the yield of essential oil extracted by the Microwave-assisted hydrodistillation (MAHD). Calamondin essential oil is determined by the microwave assisted hydrodistillation method and analyzed by GC-MS. Extraction essential oil Calamondin with MAHD in optimal conditions for 45 min, 300W capacity and 1:3 shells/water ratio. The main components of volatile compounds in Calamondin essential oils include limonene (96.039%), β-myrcene (0.953%), 1R-α-pinene (0.266%), sabinene (0.55%), 1,6-cyclodecadiene (1.611%), ϒ-eudesmol (0.207%), β-eudesmol (0.232%), α-eudesmol (0.185%). The oil produced by microwaves assisted hydrodistillation (MAHD) method was found to have higher levels of compounds and significant economic values.