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Evaluation of soy oil lutein isotherms obtained with selected adsorbents in hexane miscellas
Author(s) -
Palaniappan S.,
Proctor A.
Publication year - 1991
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02662321
Subject(s) - adsorption , chemistry , freundlich equation , lutein , hexane , langmuir , chromatography , peanut oil , nuclear chemistry , organic chemistry , food science , carotenoid , raw material
Bleaching of soy oil hexane/miscellas by adsorption of the lutein was examined. Quantitative differences in the adsorption behavior between a bleaching clay, alkaline rice hull ash and acid rice hull ash were measured by comparing the constants, K and n , of Freundlich isotherms. All the isotherms were dose‐dependent with K being inversely related and n directly related, to adsorbent mass. Overall, the bleaching clay performed better than the ashes. Alkaline ash had a larger K value than acid ash, but the n value of acid ash was greater. Equations of lutein adsorption were derived based on initial concentrations on lutein and the amount adsorbed per gram. Logarithmic plots produced constants, K i and ni which were the intercept and slope, respectively. As adsorbent dose increased, K i decreased and n i increased for each adsorbent studied. These findings may have applications in the processing of dilute miscellas where low temperature, low viscosity oil refining is desired.