Abstract: Dried flowers of Syringa oblata Lindl. were extracted by supercritical CO₂ and the extracts were separated in separators Ⅰ(8 MPa,45 ℃) and Ⅱ(5 MPa,35 ℃). The chemical compositions of the extract from the separators Ⅰ and Ⅱ were analysed by GC-MS. 21 Different compounds in the obtained extract from the separatorⅠwere identified and were mainly long-chain alkane (57.14 %) with nonacosane and 2,6,10,14-tetramethyl hexadecane as major compounds. Forty compounds in the extract from the separator Ⅱ were identified and were mainly oxy-compounds with hexadecanoic acid and 9,12-octadecadienoic acid (Z,Z) as major components, such as alcohols, ketones, aldehydes, acids and esters accounting for 67.5 %. The supercritical CO₂ extracts can be separated in certain extent by the two-stage separation. Temperature and pressure are the key factors for the separation results.

Key words: Syringa oblata Lindl. flowers, extract, GC-MS, supercritical CO₂ extraction