The analysis is carried out using an Agilent 6890 gas chromatograph equipped with a flame ionization detector and a capillary DB-23 column (30 m x 0,25 mm; 0.25 µm coating thickness; J&W Scientific, Agilent). Helium is used as a carrier gas at a flow rate of 1 ml/min. The temperature gradient is as follows: 150 °C for 1 min, 150 – 200 °C at 8 K/min, 200 – 250 °C at 25 K/min and 250 °C for 6 min. For the quantification of esterified fatty acids 200 µg of triheptadecanoate are used as an internal standard.
standards are available from Sigma (Germany) Larodan (Sweden), Cayman Chemical (USA), kindly provided by Mats Hamberg (Stockholm, Sweden) and Otto Miersch (Halle/Salle, Germany) or enzymatically synthesized, respectively
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