year 18, Issue 72 And S12 (Supplement 12 2019)                   J. Med. Plants 2019, 18(72 And S12): 110-120 | Back to browse issues page

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Rezvani Aghdam A, Naghdi Badi H, Abdossi V, Hajiaghaee R, Hosseini S E. Changes in the Essential Oil Content and Composition of Lippia citriodora under Vacuum Oven-drying and Pre-drying Operation. J. Med. Plants 2019; 18 (72) :110-120
1- Department of Horticulture, Science and Research Branch, Islamic Azad University, Tehran, Iran
2- Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran ,
3- Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran
4- Department of food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
Abstract:   (2739 Views)
Background: Pre-drying operations and drying methods have a significant effect on the quantity and quality of plants essential oils.
Objective: In this study, the effect of pre-drying operation and vacuum oven-drying was investigated on the essential oil content and composition of Lippia citriodora.
Method: This research was conducted as a factorial experiment in a completely randomized design (CRD) with three replications. The two studied factors were (1) pre-drying operations in two levels including pre-drying and without pre-drying operation, and also (2) drying methods in 5 levels including fresh plant, shade drying and vacuum oven-drying at 35, 45 and 55°C at 0.5 bar atmospheric pressure.  In this study, the amount of pigments and essential oil content and composition were measured.
Results: The results indicated that the highest chlorophyll content was related to treatment of vacuum oven-drying at 55 °C with a pre-drying treatment, while the highest amount of essential oil was obtained by vacuum oven-drying at 45 °C without a pre-drying operation. The highest amounts of monoterpene hydrocarbons, oxygenated monoterpenes, and geranial were obtained by drying at 55 °C, while the highest content of sesquiterpene hydrocarbons, oxygenated sesquiterpenes and neral were observed in Low-temperature drying.
Conclusion: In general, this study indicated that vacuum oven-drying at 45 °C was the best drying method for obtaining maximum content of essential oil and active components.
Full-Text [PDF 475 kb]   (954 Downloads)    
Type of Study: Research | Subject: Agriculture & Ethnobotany
Received: 2019/07/9 | Accepted: 2019/09/25 | Published: 2020/03/7

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