Chemotyping of new hop (Humulus lupulus L.) genotypes using comprehensive two-dimensional gas chromatography with quadrupole accurate mass time-of-flight mass spectrometry.

DanDan Yan, Yong Foo Wong, Laura Tedone, Robert A Shellie, Philip J Marriott, Simon P Whittock, Anthony Koutoulis

Journal: Journal of chromatography. A 2018;1536():110-121

PMID: 28830588

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Abstract

Comprehensive two-dimensional gas chromatography with quadrupole accurate mass time-of-flight mass spectrometry (GC×GC-Q-TOFMS) is employed to profile Humulus lupulus L. (hop) essential oils. Comparison of characterised essential oils allows discrimination among chemotypes. Experimental and commercial hop genotypes displayed distinguishable chemotypic patterns among the volatile secondary metabolites making up their essential oils. In total, 210-306 unique compounds were detected (depending on specific genotype), with 99 of these compounds either positively or tentatively identified. Identified volatile secondary metabolites were grouped into esters, monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpene hydrocarbons, oxygenated sesquiterpenes and ketones. Terpenoids were the dominant chemical families across all hop genotypes analysed, representing between 67% and 90% of the total ion count. The multidimensional chromatographic profiles of hop essential oils are extremely information-rich, making GC×GC-Q-TOFMS useful for fast screening of new hybrid hop genotypes, and therefore informing breeding strategies to derive new commercial hop cultivars for the development of distinctive and desirable beers.

Address: Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia; Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, VIC 3800, Australia.; Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, VIC 3800, Australia.; Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia.; Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia; Trajan Scientific and Medical, 7 Argent Place Ringwood 3154 VIC, Australia.; Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, VIC 3800, Australia. Electronic address: [email protected].; Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia; Hop Products Australia, 446 Elizabeth St, Hobart, TAS 7000, Australia.; School of Biological Sciences, University of Tasmania, Hobart, TAS 7001, Australia. Electronic address: [email protected].

DOI: 10.1016/j.chroma.2017.08.020

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MeSH Terms: Beer, Gas Chromatography-Mass Spectrometry, Genotype, Humulus, Monoterpenes, Oils, Volatile, Sesquiterpenes, Terpenes