期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 277, 期 -, 页码 163-169出版社
ELSEVIER
DOI: 10.1016/j.molliq.2018.12.110
关键词
Water/ethanol mixture; Subcritical extraction; Microalgae oil; Nannochloropsis salina
资金
- Iran National Science Foundation (INSF) [94/S/43089]
Changing solvent polarity at subcritical conditions, by an appropriate co-solvent, may be used to enhance oil extraction from different raw materials. As a newly commercially interested process, oil extraction from Nannochloropsis sauna as a valuable bio-resource, by subcritical water-ethanol mixture as a polarity altered solvent, was investigated. Response surface methodology (RSM) was applied to achieve the best operating conditions. Three factors including temperature (90-150 degrees C), water-ethanol concentration (25-75 wt%) and flow rate (1.0-4.0 ml/min) were investigated. The best separation conditions were determined at 90 degrees C, 75 wt% ethanol and 4 ml/min. The oil composition was compared with four other methods including subcritical water extraction (SCWE), ultrasound-assisted extraction (UAE), Soxhlet (SOX) and Folch methods. The main fatty acids were identified as C16:0, C18:0, C18:1c and C18:3c. The highest extraction efficiency of 33.93 wt% was achieved for subcritical water/ethanol mixture. (C) 2018 Elsevier B.V. All rights reserved.
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