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| Physicochemical properties and characterization of Cornus wilsoniana fruit oil prepared by low temperature pre-pressing-subcritical n-butane extraction |
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| DOI： |
| KeyWord:low-temperature pre-pressing subcritical extraction n-butane Cornus wilsoniana fruit oil thermal stability biodiesel |
| FundProject:国家重点研发计划（2019YFB1504001）；长沙市创新平台与人才计划（kh2101007）；湖南省林业科技创新计划项目（XLK202101-1） |
| Author Name | Affiliation | | WU Jingzhi1,2, WU Hongmei1, XIAO Jingjing1,2,3,4,
LI Changzhu2,3,4, XIAO Zhihong2,3,4 | 1.College of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, Hunan,
China
2.State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of
Forestry, Changsha 410004, China； 3.Hunan Provincial Key Laboratory of Oils & Fats
Molecular Structure and Function, Changsha 410004, China
4.Key Laboratory of
National Forestry and Grassland Administration on Utilization Science for
Southern Woody Oil Resources, Changsha 410004, China |
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| Abstract: |
| In order to obtain high quality Cornus wilsoniana fruit oil as a biodiesel raw material, low-temperature pre-pressing-subcritical n-butane extraction method was used to extract Cornus wilsoniana fruit oil. The extraction rate, physicochemical properties and fatty acid composition of Cornus wilsoniana fruit oil were measured. In addition, the thermal stability, rheological properties, and functional groups of Cornus wilsoniana fruit oil were characterized using a thermogravimetric analyzer, rheometer, and Fourier infrared spectroscopy. The results showed that the extraction rate of Cornus wilsoniana fruit oil using low-temperature pre-pressing-subcritical n-butane extraction was 98.54%. The acid value, iodine value, saponification value, and refractive index of Cornus wilsoniana fruit oil were 1.50 mgKOH/g, 100.24 gI/100 g, 189.71 mgKOH/g and 1.472 9, respectively. The main fatty acid components of Cornus wilsoniana fruit oil were linoleic acid (38.70%), palmitic acid (34.80%) and oleic acid (22.10%), and the relative content of unsaturated fatty acid was 64.73%. Rheological analysis showed that the Cornus wilsoniana fruit oil was a non-Newtonian fluid. The thermal analysis showed that the Cornus wilsoniana fruit oil had a certain degree of thermal stability. Infrared spectrum analysis showed that the Cornus wilsoniana fruit oil was rich in unsaturated fatty acid, which was an excellent raw material for biodiesel production. In conclusion, the low-temperature pre-pressing-subcritical n-butane extraction for the Cornus wilsoniana fruit oil has high oil extraction rate, and the oil extracted has good thermal stability, low acid value, and can be used as excellent raw materials for the preparation of biodiesel. |
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