Supercritical CO₂ Extraction and Infrared Spectrum Analysis of Coix Seed Oil

Abstract

This study focuses on the technological conditions of extraction of Coix seed oil by supercritical CO2 and the infrared spectrum analysis methods of Coix seed oil, and discusses the effects of extraction temperature, extraction pressure, extraction time and CO2 flow rate on the extraction efficiency. The following optimal technological parameters are obtained from orthogonal test: extraction temperature of 45°C, extraction pressure of 30 MPa, extraction time of 70 min, carbon dioxide flow rate of 30 kg/h. Under these conditions, the extraction rate of Coix seed oil reaches 81.4%. Fourier transform infrared spectroscopy (FTIR) is used to study the infrared spectrum characteristics of Coix seed oil, through which the main components of Coix seed oil can be preliminarily identified, providing a theoretical basis for the deep processing of Coix seed and the quality control of Coix seed oil.