Process for producing xanthohumol present in hops and...

Details Process for producing xanthohumol present in hops and... Process for producing xanthohumol present in hops and...

2005-03-15

2005-03-15

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S327000, C568S337000, C568S424000, C568S600000

Reexamination Certificate

active

06867332

ABSTRACT:
A process is specified by which the xanthohumol present in hops can be isolated in high yield in an economical manner. In the process an ethanol pure resin extract is first extracted with a liquid or supercritical solvent in which the xanthohumol is insoluble and the resultant extraction residue is first washed with a first solvent mixture and then the extraction residue which has been washed with the first solvent mixture is, after removing the first solvent mixture, extracted with a second solvent mixture, the first solvent mixture having a higher polarity than the second solvent mixture. The hop extract produced from the second solvent mixture has a xanthohumol content of at least 85% by weight.

REFERENCES:
patent: 3794744 (1974-02-01), Gardner
patent: 3875316 (1975-04-01), Humphrey
patent: 4490405 (1984-12-01), von Horst et al.
patent: 5011594 (1991-04-01), Haeffner et al.
patent: 5679716 (1997-10-01), Tobe et al.
patent: 23 50 633 (1973-10-01), None

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