余甘子核仁油的微波辅助萃取工艺及脂肪酸组成分析_张雯雯 . Microwave assisted extraction and fatty acid composition analysis of Phyllanthus emblica L. kernel oil

Abstract

The existing studies about extraction of oil from seeds of Phyllanthus emblica L. and analysis of fatty acid composition were incomplete, with the aim of optimizing the process conditions for the microwave-assisted solvent extraction of oil from seeds of Phyllanthus emblica L., the effects of three operating parameters including solid/solvent ratio, microwave power and extraction time were investigated. The mathematical model between oil extraction rate and influencing factors was established with the method of response surface optimization, and the best extraction conditions were found: the solid/solvent ratio was 1:9.8, microwave power 335W, and extraction time 12.3min. Under the best extraction conditions, the extraction rate of seeds’ oil reached 17.08% and the extraction series was two. Gas chromatography-mass spectrometry(GC-MS) analysis was used to determine the fatty acid composition of the Phyllanthus emblica L. seed oil. It was found that the main fatty acids in the oil were unsaturated fatty acid which accounted for 80.36%. The linolenic acid compounds accounted for 79.79%. A small amount of palmitoleic acid, 11-eicosenoic acid and 8 kinds of saturated fatty acids were founded. Furthermore a small amount of campesterol, β–sitosterol and β –tocopherol were also detected and the high nutritional value of oil from seeds of Phyllanthus emblica L. could be discovered.