Comparative Study on Extraction Methods for Perilla Oil

[Objective] The study was to increase the oil yielding rate of perilla seed.[Method] The methods of mechanical compression,chemical extraction,soxhlet extraction and supercritical CO2 extraction were taken to extract the oil in perilla seed.With oil yielding rate of perilla seed after extraction as investigation index,the suitable extraction method for oil in perilla seed was screened.[Result] The oil yielding rates with the method of mechanical compression,chemical extraction,soxhlet extraction and supercritical CO2 extraction were 12.79%,15.37%,18.52% and 38.58% resp.The standard deviation of extraction method with supercritical CO2 was the smallest,and from which the data was reliable.The standard deviation of mechanical compression method was the biggest,and from which the data was unreliable.The extraction amount with soxhlet extraction method was less in each extraction,and this method could be only used in experimental study.The extraction solvent of chemical extraction had poison which could cause some pollution and toxicity.The supercritical CO2 extraction method was better than other methods,but its cost was too high.[Conclusion] It was more feasible to extract the oil in perilla seed with supercritical CO2 extraction method.