myriocin (Myr) from Mycelia sterilia ≥ 98% (HPLC) powder was purchased from Sigma-Aldrich (Milan, Italy); 14-hydroxy-myriocin was prepared in our laboratory by chemical reduction of the carbonyl group, purified and characterized by mass spectrometry. Sphingolipids standards were purchased by Avanti Polar Lipids (Alabaster, USA). Gelucire® 44/14 (lauroyl polyoxyl-32 glycerides) was donated by Gattefossè (France). Mygliol 812® (triglyceride capric/caprylic acids) was purchased from Farmalabor (Italy). Tween 80 and benzalkonium chloride were purchased from Sigma-Aldrich (Milan, Italy).
Methanol (MeOH), acetonitrile, ammonium formate, acetic acid, potassium hydroxide (KOH) and formic acid (all of analytical grade) were supplied by Merck (Darmstadt, Germany). Water was MilliQ grade.
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