The effectiveness of sequential washes (isopropanol/hexane) of increasing polarity for desorbing soybean oil pigment (lutein) from silica was studied. Increasing the polarity promoted desorption of pigment, as the amount of adsorbed pigment increased. The evidence suggests that silicic acid has adsorption sites of variable accessibility. Lutein adsorption isotherms show that much of the adsorption capacity was regained after desorption.
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Proctor et al. (1989) studied this question.
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