Supercritical Extraction of Essential Oil from Lemon Grass and Analysis of Its Chemical Constituents

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Supercritical Extraction of Essential Oil from Lemon Grass and Analysis of Its Chemical Constituents

Supercritical CO2 was used to extract essential oil from lemon grass, and L9 (34) orthogonal test table was designed to optimize the extraction conditions. The results showed that the highest yield of lemon grass essential oil was 4.81% under the conditions of SFE-2 at 35 C, 20 MPa, 40 min static extraction time and 40 min dynamic extraction time. The chemical constituents of lemon grass essential oil were analyzed by gas chromatography-mass spectrometry (GC/MS) combined with related literatures. A total of 31 chemical constituents were identified, mainly alkenes, aldehydes, alcohols and acids. Among them, orange flower aldehyde and Geranium aldehyde were 29.92% and 21.80% respectively. This method is environmentally friendly, rapid and accurate. It can be used to control the quality and stability of lemon grass essential oil extracted by supercritical fluid extraction.

Supercritical Extraction of Essential Oil from Lemon Grass and Analysis of Its Chemical Constituents

Keywords: extraction of lemon grass essential oil, supercritical CO2 extraction of lemon grass