ISSN:
0935-6304
Keywords:
Packed capillary liquid chromatography
;
Hop bitter acids
;
Beer bitter acids
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
High efficiency liquid chromatography (LC) on both coupled conventional columns and long micro-LC columns, both with diode array detection, has revealed the presence of some hitherto unknown compounds in hop extracts. Proof is advanced that ethanol extracts of hops contain iso-alpha acids.The elution order of the cis-trans pairs of the iso-alpha acids, and the separation of the alpha acids from the deoxyalpha acids, is reversed by switching from methanol to acetonitrile in the reversed phase solvent system.An LC solvent system giving higher resolution (higher selectivity factor) of the iso-alpha acid cis and trans stereoisomers is obtained by adding magnesium salts to the eluent.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jhrc.1240131103
Permalink