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- Tài liệuA comparison of chemical composition and antioxidant activity in various Vietnamese garlic oil samples(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2020-10) Nguyen, Thi Ngoc Lan, MDGarlic is a familiar spice in all households and in medicine. It is also known for its potent antioxidant and anti-cancer properties. This study determined the optimal combination of operating parameters for the hydrodistillation of Ly Son garlic essential oil. The effects of distillation time, water-to-material ratio, soaking time in NaCl solution, and NaCl concentration on the yield of essential oil extraction were investigated. The results established the optimal extraction conditions as follows: distillation time of 2.5 hours, soaking time of 1 hour, NaCl concentration of 2%, and a water-to-material ratio of 1:7. Under these conditions, the maximum yield obtained was 3%. Ly Son garlic exhibited the highest antioxidant capacity, while Phan Rang garlic showed the lowest.
- Tài liệuExtraction of fennel essential oil (Foeniculum vulgare M.): method, chemical composition, and kinetic model(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2024-08) Cuong, M. Huynh; Danh, H. Pham, MSc.Fennel (Foeniculum vulgare M.) is one of the most commonly used and extensively studied medicinal herbs worldwide. Many researchers report multitudinous health benefits. This study used hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD) methods to extract fennel essential oil. Parameters affecting the process such as material-to-water ratio, heater power, and distillation time were investigated. Both techniques achieved the highest yield (1.9%) at a material-to-water ratio of 1:6, heater power of 350 W (HD), and 1080 W (MAHD). Under these conditions, the two-site desorption model showed compatibility, i.e., the extraction process included two stages of breaking essential oil particles and diffusing them from plant cells. Chemical composition analysis showed fennel essential oil contained four main components: anethole (58.76%), estragole (26.55%), terpinolene (8.32%), and D-limonene (4.66%). Among them, anethole is the main scent compound of fennel seed oil and exhibits anticancer activity.