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Original Articles

Characterization of Hop Acids by Liquid Chromatography with Negative Electrospray Ionization Mass Spectrometry

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Pages 118-122 | Published online: 06 Feb 2018
 

Abstract

The analysis of hop acids, humulones and lupulones, with negative electrospray ionization mass spectrometry (MS) is described for two different chromatographic systems. One system focuses on the complete resolution of the ad- and normal homologues implying that no optimal mass spectrometric parameters can be used, whereas the other system makes no compromise to the MS and yields a high sensitivity. The latter system is especially suitable for the fast screening of bitter acids. With this system, the detection limit with selected ion monitoring (SIM)-MS could be estimated to be 10 ng/ml for the humulones and 5 ng/ml for the lupulones. The presence of hop acids in beer was investigated and was found to be positive for humulones, whereas lupulones could not be detected.

Resumen

Es descrito el análisis de ácidos de lupulo, humulonas y lupulonas, por espectrometría de masas de ionización electrorocio negativo, por dos sistemas cromatográficos diferentes. Un sistema se enfoca en la completa resolución de los homólogos normal y ad implicando que parámetros espectrometricos de masa no optima pueden ser usados, mientras que el otro sistema no se compromete al MS y proporciona una alta sensibilidad. El ultimo sistema es especialmente conveniente para el rápido monitoreo de ácidos amargos. Con este sistema el limite de la determinación con espectrometría de masas por medio de monitoreo de ion selective (SIM) puede ser estimado en 10 ng/ml para las humulonas y 5 ng/ml para las lupulonas. La presencia de ácidos de lupulo en cerveza fue investigado y se encontró era positivo para humulonas, mientras que lupulonas no pudieron ser detectadas.

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