Recovery of used frying oils with adsorbent combinations: refrying and frequent oil replenishment

Treatment of used frying oils with adsorbent combinations may improve the q uality of fried foods and extend the frying life of oil. Two selected combi nations of Four commonly used filter aids: Britesorb (Br), Hubersorb 600 (H B), Frypowder (Fr), and Magnesol (Ma) were used to recover used frying oils by vacuum filtration. The effectiveness of the adsorbent treatments were e valuated by refrying chicken fritters and breasts in the recovered used oil . After 32 h continuous frying, the parameters of treated oil subjected to adsorbent combinations F (3% HB + 3% Ma + 2% Fr) and B (2% HB + 2% Ma + 3% Br), were reduced as follows: 61.9 and 59.7%, 38.0 and 11.3%. 25.2 and 19.5 %. and 9.4 and 3.5% for free fatty acids (FFA), total polar component (TPC) , Foodoil Sensor (FOS) reading, and color differences (DeltaE), respectivel y, compared to the untreated used oil. After daily treatment for 4 days, th e filter aid combination F reduced the final values of FFA, TPC. FOS and co lor differences by 64.2, 19.1, 32.6 and 4.4%, respectively, compared to the untreated control. These adsorbent combinations may be useful in extending the life of frying oils. (C) 2001 Elsevier Science Ltd. All rights reserve d.