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Duarte LM, Aredes RS, Amorim TL, de Carvalho Marques FF, de Oliveira MAL. Determination of α- and β-acids in hops by liquid chromatography or electromigration techniques: A critical review. Food Chem 2022; 397:133671. [PMID: 35908460 DOI: 10.1016/j.foodchem.2022.133671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 07/06/2022] [Accepted: 07/08/2022] [Indexed: 01/12/2023]
Abstract
Hop plays an essential role in brewing beer and its study and analysis is of paramount importance. - and -acids are considered two of the most important hop components. While -acids are associated with the bitter flavor, -acids have antimicrobial effects. This work aims to critically review the published analytical methods for - and -acids determination in hops employing separation methods in liquid medium: liquid chromatography (LC) and capillary electrophoresis (CE). The types of hop samples, the optimized protocols to extract the hop acids, and the main instrumental conditions for both LC and CE techniques are highlighted and discussed. Specific and critical aspects of the - and β-acids separation by LC and CE and some challenges in this field are raised. Several key aspects discussed in this review may be of practical importance for brewers, whether in the microbrewery or industry and for researchers in the brewing field.
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Affiliation(s)
- Lucas Mattos Duarte
- Department of Chemistry, Institute of Exact Sciences, Federal University of Juiz de Fora, José Lourenço Kelmer, 36036-900 Juiz de Fora, MG, Brazil; Graduate Program in Chemistry (PPGQ-UFF) - Institute of Chemistry, Fluminense Federal University, Outeiro de São João Batista, s/n, 24020-141 Niterói, RJ, Brazil.
| | - Rafaella Silva Aredes
- Graduate Program in Chemistry (PPGQ-UFF) - Institute of Chemistry, Fluminense Federal University, Outeiro de São João Batista, s/n, 24020-141 Niterói, RJ, Brazil.
| | - Tatiane Lima Amorim
- Department of Chemistry, Institute of Exact Sciences, Federal University of Juiz de Fora, José Lourenço Kelmer, 36036-900 Juiz de Fora, MG, Brazil
| | - Flávia Ferreira de Carvalho Marques
- Graduate Program in Chemistry (PPGQ-UFF) - Institute of Chemistry, Fluminense Federal University, Outeiro de São João Batista, s/n, 24020-141 Niterói, RJ, Brazil.
| | - Marcone Augusto Leal de Oliveira
- Department of Chemistry, Institute of Exact Sciences, Federal University of Juiz de Fora, José Lourenço Kelmer, 36036-900 Juiz de Fora, MG, Brazil.
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2
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Dušek M, Jandovská V, Mikyška A, Olšovská J. Novel and efficient approach to identify hop cultivars (Humulus lupulus L.) using cultivar identification diagram strategy based on fingerprint of flavonol di- and tri-O-glycosides. Eur Food Res Technol 2020. [DOI: 10.1007/s00217-020-03653-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Van Holle A, Muylle H, Ruttink T, Van Landschoot A, Haesaert G, Naudts D, De Keukeleire D, Roldán-Ruiz I. Single Nucleotide Polymorphisms and Biochemical Markers As Complementary Tools To Characterize Hops ( Humulus lupulus L.) in Brewing Practice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:3761-3771. [PMID: 30896165 DOI: 10.1021/acs.jafc.9b00816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In brewing practice, the use of the appropriate hop variety is essential to produce consistent and high-quality beers. Yet, hop batches of the same variety cultivated in different geographical regions can display significant biochemical differences, resulting in specific taste- and aroma-related characteristics in beer. In this study, we illustrate the complementarity of genetic and biochemical fingerprinting methods to fully characterize hop batches. Using genotyping-by-sequencing (GBS), a set of 1 830 polymorphic single nucleotide polymorphism (SNP) markers generated 48 unique genetic fingerprints for a collection of 56 commercial hop varieties. Three groups of varieties, consisting of somaclonal variants, could not be further differentiated using this set of markers. Biochemical marker information offered added value to characterize hop samples from a given variety grown at different geographical locations. We demonstrate the power of combining genetic and biochemical fingerprints for quality control of hop batches in the brewing industry.
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Affiliation(s)
- Ann Van Holle
- Faculty of Bioengineering Sciences, Department of Plants and Crops , Ghent University , Coupure Links 653 , 9000 Ghent , Belgium
- De Proefbrouwerij , Doornzelestraat 20 , 9080 Lochristi , Belgium
| | - Hilde Muylle
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO) , Caritasstraat 39 , 9090 Melle , Belgium
| | - Tom Ruttink
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO) , Caritasstraat 39 , 9090 Melle , Belgium
| | - Anita Van Landschoot
- Faculty of Bioengineering Sciences, Department of Biotechnology , Ghent University , Valentin Vaerwyckweg 1 , 9000 Ghent , Belgium
| | - Geert Haesaert
- Faculty of Bioengineering Sciences, Department of Plants and Crops , Ghent University , Coupure Links 653 , 9000 Ghent , Belgium
| | - Dirk Naudts
- De Proefbrouwerij , Doornzelestraat 20 , 9080 Lochristi , Belgium
| | - Denis De Keukeleire
- Faculty of Pharmaceutical Sciences , Ghent University , c/o Gontrode Heirweg 115 , 9090 Melle , Belgium
| | - Isabel Roldán-Ruiz
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO) , Caritasstraat 39 , 9090 Melle , Belgium
- Faculty of Sciences, Department of Plant Biotechnology and Bioinformatics , Ghent University , Technologiepark Zwijnaarde 71 , 9052 Zwijnaarde , Belgium
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Ocvirk M, Ogrinc N, Košir IJ. Determination of the Geographical and Botanical Origin of Hops (Humulus lupulus L.) Using Stable Isotopes of C, N, and S. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:2021-2026. [PMID: 29397717 DOI: 10.1021/acs.jafc.7b06010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A need exists for a reliable method to determine the geographical and botanical origin of hops. For this study, three sets of samples were collected: the first set comprised 5 German samples; the second set comprised samples of hops from 10 of the world's major hop-growing regions; and the third comprised the 4 main Slovenian regions. The samples were analyzed using isotope ratio mass spectrometry (IRMS) to obtain δ13C, δ15N, and δ34S values. The δ15N (2.2 ‰ to 8.4 ‰) and δ34S (0.7 ‰ to 12.3 ‰) values were the most discriminating parameters for classifying hop according to geographical origin. ANOVA showed distinct groupings for 8 out of the 10 hop-growing regions. Although it was not possible to distinguish the geographical origin of hops based on δ13C (-28.9 ‰ to -24.7 ‰), in the case of botanical origin, δ13C values proved to be the most discriminative albeit with limited success.
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Affiliation(s)
- Miha Ocvirk
- Institute for Hop Research and Brewing , Cesta Žalskega Tabora 2, SI-3310 Žalec, Slovenia
| | - Nives Ogrinc
- Department of Environmental Sciences, "J. Stefan" Institute , Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Iztok Jože Košir
- Institute for Hop Research and Brewing , Cesta Žalskega Tabora 2, SI-3310 Žalec, Slovenia
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Yan D, Wong YF, Tedone L, Shellie RA, Marriott PJ, Whittock SP, Koutoulis A. Chemotyping of new hop (Humulus lupulus L.) genotypes using comprehensive two-dimensional gas chromatography with quadrupole accurate mass time-of-flight mass spectrometry. J Chromatogr A 2017; 1536:110-121. [PMID: 28830588 DOI: 10.1016/j.chroma.2017.08.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 04/28/2017] [Accepted: 08/07/2017] [Indexed: 02/03/2023]
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.
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Affiliation(s)
- DanDan Yan
- 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
| | - Yong Foo Wong
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, VIC 3800, Australia
| | - Laura Tedone
- Australian Centre for Research on Separation Science, School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia
| | - Robert A Shellie
- 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
| | - Philip J Marriott
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, VIC 3800, Australia.
| | - Simon P Whittock
- 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
| | - Anthony Koutoulis
- School of Biological Sciences, University of Tasmania, Hobart, TAS 7001, Australia.
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