Evaluation of peanut hulls as an alternative to bleaching clays


  • M. M. M. Hassanein Fats and Oils Department, National Research Centre
  • S. M. El- Shami Fats and Oils Department, National Research Centre
  • F. S. Taha Fats and Oils Department, National Research Centre




Bleaching, Carbonization, Miscella, Peanut hull, Soybean oil


Peanut hulls (PNH) were carbonized at different temperatures, times, and evaluated at different concentrations as an alternative to bleaching clays. Evaluation of bleached crude soybean oil with PNH was based on their delta free fatty acids, reduction in peroxide value (PV), reduction in phospholipids (PL) and bleachability. The performance of several commercially used bleaching clays was evaluated, for comparison. Mixtures were formulated including: PNH and Tonsil -N (TN), PNH and Fuller’s earth (FE) and PNH and O-passive (OP) and examined. The oxidative stability of oils was determined. Results for the investigated commercial bleaching clays revealed: TN > FE > F > TF > OP. Highest reduction in PV and PL, and highest bleachability were achieved for soybean oil bleached with 2% PNH carbonized at 500°C for 30 min (PNH”). Mixtures of PNH” with the three chosen bleaching clays indicated that 1PNH”: 2TN gave the highest bleachability. CSO was miscella bleached in hexane using PNH” and resulted in an appreciable improvement in all oil characteristics, especially in bleachability. Oxidative stability of oils was in the following order: TN > control > FE > PNH” with Induction period values of 23,1 > 6,43 > 5,73 > 2,85 h, respectively.


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How to Cite

Hassanein MMM, El- Shami SM, Taha FS. Evaluation of peanut hulls as an alternative to bleaching clays. grasasaceites [Internet]. 2011Sep.30 [cited 2023Feb.6];62(3):299-307. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/1328