| 摘要 |
A method for concentrating trans-xanthophyll esters from marigold oleoresin, which includes blending the oleoresin with a solvent and a co-solvent of lower alkanols and recovering a precipitate enriched with trans-xanthophyll esters at a temperature of above 22° C. The recovery and purity of the trans-xanthophyll esters is greater when using the alkanol blend than when using only a lower alkanol from the said blend. The said process is most useful using a lower-grade, commercially available oleoresin, thereby helping small producers, who do not have access to higher-grade oleoresin made through backward integration to marigold cultivation and harvest.
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