Fat content of potato chips was estimated using the Soxhlet procedure following the AOAC method 963.15 (AOAC, 1995a). Fat was extracted using a Büchi B-811 Universal Extraction System (Büchi Labortechnic AG, Flawil, Switzerland). A 2 g sample was extracted for 180 min with diethyl ether used as a solvent. Measurements were made at least in triplicate.