| Abstract: | A modified loop-type interface is decribed which uses two 6-way valves and concurrent eluent evaporation to perform an on-line transfer and simultaneous gas chromatographic analysis of two different fractions pre-separated by liquid chromatography. The interface is used to simultaneously analyze aliphatic alcohols and sterols present in olive oil. LC pre-separation is carried out using a normal phase column (20 cm × 0.21 cm i.d.) and hexane-isopropanol (99:1) as a mobile phase at a flow of 0.2 ml/min; for the GC analysis a 5 % phenyl, 95 % dimethyl siloxane (25 m × 0.32 mm i.d., 0.4 μm film thickness) column is used. |
