Process for separation of sterol compounds from fluid mixtures
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United States of America Patent
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Nov 12, 1991
Grant Date -
N/A
app pub date -
Jun 30, 1989
filing date -
Jun 30, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Cholesterol and other sterols are separated from fluid mixtures, especially foodstuffs such as egg yolk, using a surface-modified adsorbent which selectively adsorbs the sterols. The surface-modified adsorbent is prepared by (a) treating an adsorbent with a sterol compound so that the sterol compound becomes adsorbed on the adsorbent surface; (b) treating the sterol-modified adsorbent with a surface-modifying agent, this surface-modifying agent having a reactive group capable of reacting with the surface of the adsorbent, and an elongate hydrophobic portion, so that the surface of the adsorbent not covered by the adsorbed sterol compound reacts with the surface-modifying agent; and (c) desorbing the sterol compound from the adsorbent. A surface-modified adsorbent prepared in this way may also be used to remove sterols from solvents (such as carbon dioxide) which have themselves been used to extract sterols from foodstuffs, thus avoiding the need to distil and condense the solvent before it is recycled to treat further batches of the foodstuff.
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