Effect of Pressure on the Efficiency of Supercritical Fluid Extraction of Black Coffee Oil

Abstract

The effect of pressure on the efficiency of the supercritical (SC) fluid extraction of oil from roasted coffee beans has been investigated. The yield of oil increases from 6 to 17% with an increase in pressure from 20 to 50 MPa at 80°C and a ratio of SC-CO₂ extractant to raw material mass of 30 : 1. Temperature only marginally affects the extraction efficiency at 50 MPa. The technique of analyzing coffee-bean extracts using SC fluid chromatography combined with mass spectrometry has been developed, allowing one to conduct an express qualitative comparison of the extract compositions, as well as make a qualitative analysis of the triglyceride composition of the lipid fraction.