Adsorption of lutein from crude soybean oil onto acid ash prepared from rice hulls displayed Freundlich‐type isotherms. Different isotherms were obtained depending on the amount of adsorbent used. Addition of isopropanol to the miscella and water deactivation of the adsorbents decreased lutein adsorption. These observations suggested competitive adsorption based on polarity. Triglycerides were adsorbed to a greater extent than lutein, probably due to their larger concentrations. These findings parallel the adsorption behavior of silicic acid.
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Palaniappan et al. (1990) studied this question.
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