Fried products were dried to a constant mass and pulverised in a grinder. About 5 g of ground sample was transferred into 25 80 1.5 mm cellulose extraction thimbles (Whatman Intl. Ltd., Maid stone, UK). Extraction was done in an automated Soxhlet machine using petroleum ether (40–60 °C) for 4 h based on the AACC method 30–25.01 [22].
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