Bleaching efficiencies of bentonites, montmorillonites and sepiolites for alkali‐refined rapesseed, soybean, wheatgerm, safflower, corn, cottonseed and sunflower oils were investigated by a batch method at 110°C. The sepiolites with more acid sites at −5.6 < Ho ≥ −3.0 were the most effective in bleaching of each alkali‐refined oil. Surface area and acidity at −5.6>Ho ≥ −3.0 were highly significant with bleaching efficiency. The sepiolites (numbers 2 and 3) were more suitable than standard activated clay because they were more effective both in retaining tocopherols and in reducing free fatty acids after bleaching.
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Boki et al. (1992) studied this question.
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