Comparison of Four Different Extraction Methods of Oil from Macadamia integrifolia

Abstract:

Four different extraction methods, solvent extraction, ultrasonic wave-assisted extraction, Soxhlet extraction and supercritical CO₂ extraction, were used to extract oil from Macadamia integrifolia, which also named Macadamia nut oil. Fatty acid compositions of Macadamia nut oil were analyzed by gas chromatography and mass spectrometry (GC-MS). The results showed the highest extraction rate was 74.63% via Soxhlet extraction, while supercritical CO₂ extraction was 70.53%, ultrasonic wave-assisted extraction was 57.19% and Solvent extraction was 50.37%. Six unsaturated fatty acids, including Z-9-Hexadecenoic acid, E-11-Hexadecenoic acid, 9,12-Octadecadienoic acid, 9-Octadecenoic acid, E-9-Octadecenoic acid and 9-eicosenoate, were identified in the oil by GC-MS．The relative extraction rate of unsaturated fatty acids were 36.53%, 44.21%, 60.62%, 56.81%, respectively. Though the extraction rate was the highest via Soxhlet extraction, the relative content of Z-9-Hexadecenoic acid and 9,12-Octadecadienoic acid were both higher extracted by supercritical CO₂ extraction than Soxhlet extraction, which were 15.38% and 1.55%,. As supercritical CO₂ extraction has no solvent residual problem, it would be the trend of the development in_{Subscript text} the future to extract Macadamia nut oil.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 3382-3386
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.3382
• Online since: December 2012
• Authors: Bing Qing Zhu, Li Jing Lin, Ji Hua Li, Guo Ti Lv, Mao Fang Huang
• Keywords: Macadamia Nut Oil, Solvent Extraction, Soxhlet Extraction, Supercritical CO₂ Extraction, Ultrasonic Wave-Assisted Extraction, Unsaturated Fatty Acid

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