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do Nascimento FMG, Trevisan MTS, Neto MLA, Owen RW, de Brito ES, Alexandre E Silva LM, Rocha KAD, Cesar CL, de Carvalho HF, Pelegati VB, da Silva SA, Marques SPD. Comparison of α and β-acid isomerization in hops and beer using HPLC, confocal microscopy, spectrofluorimetry and chemical analysis of metabolites and essential oils in flowers of different hop cultivars produced in Brazil. Food Chem 2024; 455:139879. [PMID: 38824725 DOI: 10.1016/j.foodchem.2024.139879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 04/11/2024] [Accepted: 05/27/2024] [Indexed: 06/04/2024]
Abstract
We used confocal microscopy and spectrofluorescence to characterize the emission spectra in hop flowers, to follow the isomerization processes in different hop preparations, and beers, to compare with HPLC extracted samples. Flowers of different hop cultivars produced in three regions of Brazil, were quantitated by HPLC and GC-MS. The fluorescence spectra showed two characteristic emission bands evaluated from different preparations. The isomerization process leads to a gradual decrease in fluorescence intensity as the reaction progresses. This demonstrates the valuable use of confocal microscopy and fluorescence spectroscopy for analysis of the correlation between bitter acid indices with fluorescence intensity and lifetime microscopy. Such techniques can be used directly in the flowers allowing rapid monitoring of the brewing process. Twenty-nine substances were characterized in the essential oils and some cultivars presented quantities of bitter acids and essential oil levels close to those expected for plants after more than three years of cultivation.
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Affiliation(s)
- Francisco Mateus Gomes do Nascimento
- Programa de Pós-graduação em Química. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici - Bloco 935 superior - Laboratório de Produtos Naturais e Biotecnologia (LPNBio), CP: 60451-970, Fortaleza-CE, Brazil
| | - Maria Teresa Salles Trevisan
- Programa de Pós-graduação em Química. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici - Bloco 935 superior - Laboratório de Produtos Naturais e Biotecnologia (LPNBio), CP: 60451-970, Fortaleza-CE, Brazil.
| | - Manoel Lourenço Alves Neto
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, CP: 60440-900, Fortaleza-CE, Brazil.
| | - Robert Wyn Owen
- Programa de Pós-graduação em Química. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici - Bloco 935 superior - Laboratório de Produtos Naturais e Biotecnologia (LPNBio), CP: 60451-970, Fortaleza-CE, Brazil
| | | | - Lorena Mara Alexandre E Silva
- Embrapa Agroindústria Tropical, CP: 60511-110, Fortaleza-CE, Brazil; Departamento de Biologia Estrutural e Funcional, Universidade Estadual de Campinas, Instituto de Biologia, Campinas - SP, Brazil.
| | | | - Carlos Lenz Cesar
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, CP: 60440-900, Fortaleza-CE, Brazil.
| | - Hernandes Faustino de Carvalho
- Departamento de Biologia Estrutural e Funcional, Universidade Estadual de Campinas, Instituto de Biologia, Campinas - SP, Brazil; Instituto Nacional de Ciência e Tecnologia de Fotônica Aplicada à Biologia Celular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas - SP, Brazil.
| | - Vitor Bianchin Pelegati
- Departamento de Biologia Estrutural e Funcional, Universidade Estadual de Campinas, Instituto de Biologia, Campinas - SP, Brazil; Instituto Nacional de Ciência e Tecnologia de Fotônica Aplicada à Biologia Celular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas - SP, Brazil.
| | - Sthefanny Alves da Silva
- Departamento de Ensino, Instituto Federal de Educação, Ciência e Tecnologia do Ceará, 63902-580, Quixadá - CE, Brazil
| | - Samuel Pedro Dantas Marques
- Programa de Pós-graduação em Química. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici - Bloco 935 superior - Laboratório de Produtos Naturais e Biotecnologia (LPNBio), CP: 60451-970, Fortaleza-CE, Brazil; Instituto Federal de Educação, Ciência e Tecnologia do Ceará. Departamento de Ensino, Rod. CE-040, Km 137,1 s/n, Aracati-CE 62800-000, Brazil.
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Resende GAP, Amaral MSS, Botelho BG, Marriott PJ. Comprehensive Two-Dimensional Gas Chromatography-Mass Spectrometry as a Tool for the Untargeted Study of Hop and Their Metabolites. Metabolites 2024; 14:237. [PMID: 38668365 PMCID: PMC11051809 DOI: 10.3390/metabo14040237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/10/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
Since hop secondary metabolites have a direct correlation with the quality of beer and other hop-based beverages, and the volatile fraction of hop has a complex composition, requiring effective separation, here we explore the application of headspace solid-phase microextraction as a sample preparation method, coupled with comprehensive two-dimensional gas chromatography-mass spectrometry (GC×GC-MS) analysis. The methodology involved the use of a DVB/PDMS fibre with 500 mg of hop cone powder, extracted for 40 min at 50 °C, for both GC-MS and GC×GC-MS. The varieties Azacca, Cascade, Enigma, Loral, and Zappa were studied comprehensively. The results demonstrate that GC×GC-MS increases the number of peaks by over 300% compared to classical GC-MS. Overall, 137 compounds were identified or tentatively identified and categorised into 10 classes, representing between 87.6% and 96.9% of the total peak area. The composition revealed the highest concentration of sesquiterpene hydrocarbons for Enigma, whilst Zappa showed a relatively significant concentration of monoterpene hydrocarbons. Principal component analysis for all compounds and classes, along with hierarchical cluster analysis, indicated similarities between Zappa and Cascade, and Azacca and Loral. In conclusion, this method presents an optimistic advancement in hop metabolite studies with a simple and established sample preparation procedure in combination with an effective separation technique.
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Affiliation(s)
- Glaucimar A. P. Resende
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, VIC 3800, Australia; (G.A.P.R.); (M.S.S.A.)
- Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
| | - Michelle S. S. Amaral
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, VIC 3800, Australia; (G.A.P.R.); (M.S.S.A.)
| | - Bruno G. Botelho
- Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
| | - Philip J. Marriott
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, VIC 3800, Australia; (G.A.P.R.); (M.S.S.A.)
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Albani CM, Iglesias A, Albanese A, Fuentes G, Orallo D, Maggi M, Elissondo MC. Evaluation of the Protoscolicidal Activity of Humulus lupulus Methanolic Extracts on Echinococcus granulosus Sensu Stricto. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2024; 2024:6251666. [PMID: 38605998 PMCID: PMC11008976 DOI: 10.1155/2024/6251666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 12/06/2023] [Accepted: 03/23/2024] [Indexed: 04/13/2024]
Abstract
The larval stage of the parasite Echinococcus granulosus sensu lato (s.l) is responsible for cystic echinococcosis (CE), a long-term infection affecting humans and animals worldwide, and constitutes a serious public health concern. If left untreated, CE can cause serious damage to multiple organs, especially the liver and lungs. Regarding the treatment, in the last few years, the use of pharmacological treatment has increased, suggesting that in the future, drug therapy may replace surgery for uncomplicated cysts. However, the only available anthelmintic drug to treat this infection is the albendazole, which has an efficacy that does not exceed 50%. On the basis of the above-mentioned evidence, new and improved alternative treatments are urgently needed. The use of natural products and their active fractions and components holds great promise as a valuable resource for the development of novel and effective therapies. Hop (Humulus lupulus L.) is a bittering agent in the brewing industry for which the sedative, digestive, anti-inflammatory, and antimicrobial effects have been reported. The purpose of this study was to assess the in vitro efficacy of methanolic extracts from the leaves of hop varieties against E. granulosus sensu stricto (s.s) protoscoleces. Varieties Mapuche and Victoria caused a stronger protoscolicidal effect compared to the Bullion, Cascade, and Traful varieties (P < 0.01), coinciding with their highest content of flavonoids, total polyphenols, and saponins. The viability of protoscoleces treated with the varieties Mapuche and Victoria decreased to approximately 50% at days 5 y 8, respectively, showing alterations such as soma contraction and impaired microtriches. After 18 days of treatment with both varieties, protoscoleces were completely altered both structurally and ultrastructurally. In conclusion, the methanolic extracts of the H. lupulus varieties Mapuche and Victoria demonstrated a marked in vitro effect against E. granulosus s.s. protoscoleces. The beer-making industry exclusively uses hop cones, leaving behind large amounts of hop leaves as an agricultural by-product that is not being utilized. On the basis of our study, we propose that hop leaves could also be used as a source of secondary metabolites with anthelmintic activity.
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Affiliation(s)
- Clara María Albani
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Laboratorio de Zoonosis Parasitarias, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina
| | - Azucena Iglesias
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Centro de Investigación en Abejas Sociales, FCEyN, UNMdP, Mar del Plata, Buenos Aires, Argentina
| | - Adriana Albanese
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Laboratorio de Zoonosis Parasitarias, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina
| | - Giselle Fuentes
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Centro de Investigación en Abejas Sociales, FCEyN, UNMdP, Mar del Plata, Buenos Aires, Argentina
| | - Dalila Orallo
- Departamento de Química y Bioquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata, Buenos Aires 7600, Argentina
| | - Matías Maggi
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Centro de Investigación en Abejas Sociales, FCEyN, UNMdP, Mar del Plata, Buenos Aires, Argentina
| | - María Celina Elissondo
- Instituto de Investigaciones en Producción Sanidad y Ambiente (IIPROSAM CONICET-UNMdP), Facultad de Ciencias Exactas y Naturales-UNMdP, Centro Científico Tecnológico Mar del Plata-CONICET, Centro de Asociación Simple CIC PBA, Mar del Plata, Argentina
- Laboratorio de Zoonosis Parasitarias, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina
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Flieger J, Pasieczna-Patkowska S, Żuk N, Panek R, Korona-Głowniak I, Suśniak K, Pizoń M, Franus W. Characteristics and Antimicrobial Activities of Iron Oxide Nanoparticles Obtained via Mixed-Mode Chemical/Biogenic Synthesis Using Spent Hop ( Humulus lupulus L.) Extracts. Antibiotics (Basel) 2024; 13:111. [PMID: 38391497 PMCID: PMC10886061 DOI: 10.3390/antibiotics13020111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 02/24/2024] Open
Abstract
Iron oxide nanoparticles (IONPs) have many practical applications, ranging from environmental protection to biomedicine. IONPs are being investigated due to their high potential for antimicrobial activity and lack of toxicity to humans. However, the biological activity of IONPs is not uniform and depends on the synthesis conditions, which affect the shape, size and surface modification. The aim of this work is to synthesise IONPs using a mixed method, i.e., chemical co-precipitation combined with biogenic surface modification, using extracts from spent hops (Humulus lupulus L.) obtained as waste product from supercritical carbon dioxide hop extraction. Different extracts (water, dimethyl sulfoxide (DMSO), 80% ethanol, acetone, water) were further evaluated for antioxidant activity based on the silver nanoparticle antioxidant capacity (SNPAC), total phenolic content (TPC) and total flavonoid content (TFC). The IONPs were characterised via UV-vis spectroscopy, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and Fourier-transform infrared (FT-IR) spectroscopy. Spent hop extracts showed a high number of flavonoid compounds. The efficiency of the solvents used for the extraction can be classified as follows: DMSO > 80% ethanol > acetone > water. FT-IR/ATR spectra revealed the involvement of flavonoids such as xanthohumol and/or isoxanthohumol, bitter acids (i.e., humulones, lupulones) and proteins in the surface modification of the IONPs. SEM images showed a granular, spherical structure of the IONPs with diameters ranging from 81.16 to 142.5 nm. Surface modification with extracts generally weakened the activity of the IONPs against the tested Gram-positive and Gram-negative bacteria and yeasts by half. Only the modification of IONPs with DMSO extract improved their antibacterial properties against Gram-positive bacteria (Staphylococcus epidermidis, Staphylococcus aureus, Micrococcus luteus, Enterococcus faecalis, Bacillus cereus) from a MIC value of 2.5-10 mg/mL to 0.313-1.25 mg/mL.
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Affiliation(s)
- Jolanta Flieger
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland
| | - Sylwia Pasieczna-Patkowska
- Faculty of Chemistry, Department of Chemical Technology, Maria Curie Skłodowska University, Pl. Maria Curie-Skłodowskiej 3, 20-031 Lublin, Poland
| | - Natalia Żuk
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland
| | - Rafał Panek
- Department of Geotechnics, Civil Engineering and Architecture Faculty, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
| | - Izabela Korona-Głowniak
- Department of Pharmaceutical Microbiology, Medical University of Lublin, Chodźki 1 St., 20-093 Lublin, Poland
| | - Katarzyna Suśniak
- Department of Pharmaceutical Microbiology, Medical University of Lublin, Chodźki 1 St., 20-093 Lublin, Poland
| | - Magdalena Pizoń
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland
| | - Wojciech Franus
- Department of Geotechnics, Civil Engineering and Architecture Faculty, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
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Hagemann MH, Rigling M, Mannweiler S, Born U, Sprich E, Milyaev A, Zhang Y. Insight into the aroma quality of 'Callista' cultivar of hop (Humulus lupulus L.): Impact of harvest timing, year, and location. Food Res Int 2024; 175:113776. [PMID: 38129004 DOI: 10.1016/j.foodres.2023.113776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 11/08/2023] [Accepted: 11/22/2023] [Indexed: 12/23/2023]
Abstract
Hops (Humulus lupulus L.) are essential ingredients in brewing, contributing to beer's flavor, aroma, and stability. This study pioneers an in-depth analysis of the 'Callista' cultivar, aiming to unravel how harvest timing, annual variations, and cultivation location synergistically influence its molecular profile, sensory perception, and biochemistry. Leveraging high-performance liquid chromatography and gas chromatography-mass spectrometry-olfactometry, we identified significant year-to-year and location-based fluctuations in bitter acids-the quintessential aroma constituents in hops. Our comprehensive aroma profiling discerned 55 volatile compounds, marking the first-ever sensory detection of 2-butanone in hops, with its presence showing remarkable interannual variability. This study showed significant differences among the three years tested, whereas hops were perceived "fruitier" and more "citrusy" in 2021, even though the bitter acid and aroma analysis showed that 2022 sticks out due to extremely high lupulone values up to 10% dry cone weight and 78% β-myrcene in the oil fraction compared to 60% and 45% in 2020 and 2021, respectively. Molecular analysis of key enzymes involved in hop aroma biosynthesis revealed no significant associations with location, but a strong diurnal pattern for all genes. The results indicated that especially the hot temperatures of 2022 may have induced significant changes of cone quality, while 2021 was more interesting from the sensory evaluations, which may justify the usage of viticultural terms such as "vintage" for hop marketing. These findings contribute to a better understanding of the factors influencing hop aroma and quality.
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Affiliation(s)
- M H Hagemann
- Department Production Systems of Horticultural Crops, University of Hohenheim, 70599 Stuttgart, Germany
| | - M Rigling
- Department of Flavor Chemistry, University of Hohenheim, 70599 Stuttgart, Germany
| | - S Mannweiler
- Department of Flavor Chemistry, University of Hohenheim, 70599 Stuttgart, Germany
| | - U Born
- Department Production Systems of Horticultural Crops, University of Hohenheim, 70599 Stuttgart, Germany
| | - E Sprich
- Department Production Systems of Horticultural Crops, University of Hohenheim, 70599 Stuttgart, Germany
| | - A Milyaev
- Department Production Systems of Horticultural Crops, University of Hohenheim, 70599 Stuttgart, Germany
| | - Y Zhang
- Department of Flavor Chemistry, University of Hohenheim, 70599 Stuttgart, Germany.
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Awasthi P, Mishra AK, Kocábek T, Nath VS, Mishra S, Hazzouri KM, Sudalaimuthuasari N, Stajner N, Jakše J, Krofta K, Hájek T, Amiri KM. CRISPR/Cas9-mediated mutagenesis of the mediator complex subunits MED5a and MED5b genes impaired secondary metabolite accumulation in hop (Humulus lupulus). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 201:107851. [PMID: 37354728 DOI: 10.1016/j.plaphy.2023.107851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 06/15/2023] [Accepted: 06/17/2023] [Indexed: 06/26/2023]
Abstract
Hop (Humulus lupulus L.) is an important commercial crop known for the biosynthesis of valuable specialized secondary metabolites in glandular trichomes (lupulin glands), which are used for the brewing industry. To achieve burgeoning market demands is the essentiality of comprehensive understanding of the mechanisms of biosynthesis of secondary metabolites in hop. Over the past year, several studies using structural biology and functional genomics approaches have shown that Mediator (MED) serves as an integrative hub for RNAP II-mediated transcriptional regulation of various physiological and cellular processes, including involvement of MED5a and MED5b in hyperaccumulation of phenylpropanoid in A. thaliana. In the present work, an unprecedented attempt was made to generate Hlmed5a/med5b double loci mutant lines in hop using a CRISPR/Cas9-based genome editing system. The Hlmed5a/med5b double loci mutant lines showed reduced expression of structural genes of the flavonoid, humulone, and terpenoid biosynthetic pathways, which was more pronounced in the lupulin gland compared to leaf tissue and was consistent with their reduced accumulation. Phenotypic and anatomical observations revealed that Hlmed5a/med5b double loci mutant line exhibited robust growth, earlier flowering, earlier cone maturity, reduced cone size, variations in floral structure patterns, and distorted lupulin glands without any remarkable changes in leaf morphology, intensity of leaf color, and chlorophyll content. Comparative transcriptome analysis of leaf and lupulin gland tissues indicates that the expression of enzymatic genes related to secondary metabolite biosynthesis, phytohormone biosynthesis, floral organs, flowering time, and trichome development, including other genes related to starch and sucrose metabolism and defense mechanisms, were differentially modulated in the Hlmed5a/med5b lines. The combined results from functional and transcriptomic analyses illuminates the pivotal function of HlMED5a and HlMED5b in homeostasis of secondary meatbolites accumulation in hop.
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Affiliation(s)
- Praveen Awasthi
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Zygmunta Noskowskiego 12/14, 61-704, Poznań, Poland
| | - Ajay Kumar Mishra
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates.
| | - Tomáš Kocábek
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 370 05, České Budějovice, Czech Republic
| | - Vishnu Sukumari Nath
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates
| | - Sagarika Mishra
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates
| | - Khaled M Hazzouri
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates
| | - Naganeeswaran Sudalaimuthuasari
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates
| | - Natasa Stajner
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - Jernej Jakše
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - Karel Krofta
- Hop Research Institute, Co. Ltd., Kadaňská 2525, 438 46, Žatec, Czech Republic
| | - Tomáš Hájek
- University of South Bohemia, Faculty of Science, Branišovská 1716/31c, 370 05, České Budějovice, Czech Republic
| | - Khaled Ma Amiri
- Khalifa Centre for Genetic Engineering and Biotechnology, United Arab Emirates University, P.O. Box. Al Ain 15551, United Arab Emirates.
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Abbas F, Zhou Y, O'Neill Rothenberg D, Alam I, Ke Y, Wang HC. Aroma Components in Horticultural Crops: Chemical Diversity and Usage of Metabolic Engineering for Industrial Applications. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12091748. [PMID: 37176806 PMCID: PMC10180852 DOI: 10.3390/plants12091748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/21/2023] [Accepted: 04/23/2023] [Indexed: 05/15/2023]
Abstract
Plants produce an incredible variety of volatile organic compounds (VOCs) that assist the interactions with their environment, such as attracting pollinating insects and seed dispersers and defense against herbivores, pathogens, and parasites. Furthermore, VOCs have a significant economic impact on crop quality, as well as the beverage, food, perfume, cosmetics and pharmaceuticals industries. These VOCs are mainly classified as terpenoids, benzenoids/phenylpropanes, and fatty acid derivates. Fruits and vegetables are rich in minerals, vitamins, antioxidants, and dietary fiber, while aroma compounds play a major role in flavor and quality management of these horticultural commodities. Subtle shifts in aroma compounds can dramatically alter the flavor and texture of fruits and vegetables, altering their consumer appeal. Rapid innovations in -omics techniques have led to the isolation of genes encoding enzymes involved in the biosynthesis of several volatiles, which has aided to our comprehension of the regulatory molecular pathways involved in VOC production. The present review focuses on the significance of aroma volatiles to the flavor and aroma profile of horticultural crops and addresses the industrial applications of plant-derived volatile terpenoids, particularly in food and beverages, pharmaceuticals, cosmetics, and biofuel industries. Additionally, the methodological constraints and complexities that limit the transition from gene selection to host organisms and from laboratories to practical implementation are discussed, along with metabolic engineering's potential for enhancing terpenoids volatile production at the industrial level.
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Affiliation(s)
- Farhat Abbas
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops-South China/Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Yiwei Zhou
- Guangdong Key Laboratory of Ornamental Plant Germplasm Innovation and Utilization, Environmental Horticulture Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510642, China
| | - Dylan O'Neill Rothenberg
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops-South China/Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Intikhab Alam
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops-South China/Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Yanguo Ke
- College of Economics and Management, College of Agriculture and Life Sciences, Yunnan Urban Agricultural Engineering & Technological Research Center, Kunming University, Kunming 650214, China
| | - Hui-Cong Wang
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops-South China/Guangdong Litchi Engineering Research Center, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
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8
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Jiang H, Qi X, Zhong S, Schwarz P, Chen B, Rao J. Effect of treatment of Fusarium head blight infected barley grains with hop essential oil nanoemulsion on the quality and safety of malted barley. Food Chem 2023; 421:136172. [PMID: 37094405 DOI: 10.1016/j.foodchem.2023.136172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/26/2023]
Abstract
Fusarium mycotoxin contamination of malting barley has been a persistent food safety issue for malting companies. In this study, the effect of hop essential oil (HEO) nanoemulsion on fungal biomass and mycotoxin production during the malting process was evaluated. Furthermore, the localization of fungal hyphae on the surface and inside the tissue of barley and malts was observed. The application of HEO nanoemulsion reduced fungal biomass and deoxynivalenol (DON) contents at each stage of the malting process as compared to control. During malting process, the fungal hyphae on kernel surfaces was reduced appreciably after steeping. However, the increment of hyphae was observed between the husk and testa layer of barley after germination than raw barley grains. In addition to its antifungal activity, the antioxidant activity of HEO in the treated malts suppressed the formation of aldehydes. This study lays the foundation for the utilization of HEO in the malting industry.
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Affiliation(s)
- Haiyang Jiang
- Department of Plant Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Xiaoxi Qi
- Department of Plant Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Shaobin Zhong
- Department of Plant Pathology, North Dakota State University, Fargo, ND 58108, USA
| | - Paul Schwarz
- Department of Plant Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Bingcan Chen
- Department of Plant Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Jiajia Rao
- Department of Plant Sciences, North Dakota State University, Fargo, ND 58108, USA.
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9
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Nardini M. An Overview of Bioactive Phenolic Molecules and Antioxidant Properties of Beer: Emerging Trends. Molecules 2023; 28:molecules28073221. [PMID: 37049984 PMCID: PMC10096009 DOI: 10.3390/molecules28073221] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/31/2023] [Accepted: 04/02/2023] [Indexed: 04/14/2023] Open
Abstract
Beer is one of the oldest and most common beverages worldwide. The phenolic contents and antioxidant properties of beer are crucial factors in evaluating its nutritional quality. Special beers brewed with the addition of adjuncts are gaining in consumer preference, in response to demands for healthy food and new gustatory and olfactory stimuli. Many studies recently dealt with functional beers brewed with the addition of adjuncts. This review focuses on bioactive molecules, particularly the composition of phenolic compounds, and the antioxidant activity of beer. The current knowledge concerning the effect of the addition of adjuncts in the form of fruit, vegetables, herbs, and natural foods on the polyphenol content, antioxidant properties, and phenolic profile of beer is reviewed, with an outline of the emerging trends in brewing processes. Future studies need to complete the identification and characterization of the bioactive molecules in beer, as well as studying their absorption and metabolic fate in humans.
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Affiliation(s)
- Mirella Nardini
- CREA, Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy
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10
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Xanthohumol properties and strategies for extraction from hops and brewery residues: A review. Food Chem 2023; 404:134629. [DOI: 10.1016/j.foodchem.2022.134629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 09/16/2022] [Accepted: 10/13/2022] [Indexed: 11/22/2022]
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11
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Beyond brewing: β-acid rich hop extract in the development of a multifunctional polylactic acid-based food packaging. Int J Biol Macromol 2023; 228:23-39. [PMID: 36565824 DOI: 10.1016/j.ijbiomac.2022.12.191] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 12/08/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Hops' (Humulus lupulus L.) phytochemicals are well known for their bioactivity. In the present study, the functional properties of hop extract rich in β-acids, as potassium-salts structures (KBA), were investigated to develop a sustainable active food packaging. Polylactic acid (PLA)-based sheets were incorporated with increasing concentrations of hop extract (0.1-5 % w/w in terms of KBA) and characterized through performance and bioactive properties. KBA-added sheets presented decreased crystallinity and affected mechanical and thermal properties, especially with higher KBA amounts. The sheets' surface hydrophobicity gradually decreased by KBA-extract addition, while the water vapor permeability was not affected. A Fickian diffuse behavior and a better fit to application in fatty foods were observed during release tests. UV-blocking and antioxidant properties were improved by KBA incorporation. Furthermore, results from antibacterial assays revealed great susceptibility of Staphylococcus aureus and Listeria monocytogenes towards sheets added with 5 % of KBA. Moreover, the atomic force microscopy (AFM) observations revealed that KBA led to strong effects on the cell membranes of both bacteria, including disruption of membrane integrity and cell death. Therefore, this study is a sign of great prospects of hop β-acids use, as KBA compound, in the production of sustainable active packaging for safe food shelf-life extension.
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12
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Chen DQ, Zou C, Huang YB, Zhu X, Contursi P, Yin JF, Xu YQ. Adding functional properties to beer with jasmine tea extract. Front Nutr 2023; 10:1109109. [PMID: 36937349 PMCID: PMC10020177 DOI: 10.3389/fnut.2023.1109109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Accepted: 02/13/2023] [Indexed: 03/06/2023] Open
Abstract
Hops provide the characteristic bitter taste and attractive aroma to beer; in this study, hops were replaced by jasmine tea extract (JTE) during late-hopping. The addition of JTE improved the beer foam stability 1.52-fold, and increased the polyphenol and organic acid contents. Linalool was the most important aroma compound in hopped (HOPB) and jasmine tea beer (JTB), but other flavor components were markedly different, including dimeric catechins, flavone/flavonol glycosides, and bitter acids and derivatives. Sensory evaluation indicated that addition of JTE increased the floral and fresh-scent aromas, reduced bitterness and improved the organoleptic quality of the beer. The antioxidant capacity of JTB was much higher than that of HOPB. The inhibition of amylase activity by JTB was 30.5% higher than that of HOPB. Functional properties to beer were added by substituting jasmine tea extract for hops during late hopping.
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Affiliation(s)
- De-Quan Chen
- Tea Research Institute Chinese Academy of Agricultural Sciences, National Engineering Research Center for Tea Processing, Key Laboratory of Tea Biology and Resources Utilization, Hangzhou, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chun Zou
- Tea Research Institute Chinese Academy of Agricultural Sciences, National Engineering Research Center for Tea Processing, Key Laboratory of Tea Biology and Resources Utilization, Hangzhou, China
- Chun Zou
| | - Yi-Bin Huang
- Tea Research Institute Chinese Academy of Agricultural Sciences, National Engineering Research Center for Tea Processing, Key Laboratory of Tea Biology and Resources Utilization, Hangzhou, China
- College of Tea Science, Guizhou University, Guiyang, China
| | - Xuan Zhu
- School of Food and Bioengineering, Zhejiang Gongshang University, Hangzhou, China
| | - Patrizia Contursi
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Jun-Feng Yin
- Tea Research Institute Chinese Academy of Agricultural Sciences, National Engineering Research Center for Tea Processing, Key Laboratory of Tea Biology and Resources Utilization, Hangzhou, China
| | - Yong-Quan Xu
- Tea Research Institute Chinese Academy of Agricultural Sciences, National Engineering Research Center for Tea Processing, Key Laboratory of Tea Biology and Resources Utilization, Hangzhou, China
- *Correspondence: Yong-Quan Xu
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13
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Gresta F, Calvi A, Santonoceto C, Strano T, Ruberto G. Agronomic traits and essential oil profiles of Humulus lupulus L. cultivated in southern Italy. JOURNAL OF ESSENTIAL OIL RESEARCH 2022. [DOI: 10.1080/10412905.2022.2103190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Fabio Gresta
- Department of Veterinary Sciences, University of Messina, Messina, Italy
| | - Antonio Calvi
- Department AGRARIA, Università degli Studi Mediterranea di Reggio Calabria, Reggio, Calabria, Italy
| | - Carmelo Santonoceto
- Department AGRARIA, Università degli Studi Mediterranea di Reggio Calabria, Reggio, Calabria, Italy
| | - Tonia Strano
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Catania, Italy
| | - Giuseppe Ruberto
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Catania, Italy
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14
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Assessment of the Genetic and Phytochemical Variability of Italian Wild Hop: A Route to Biodiversity Preservation. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12115751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: Northern Italy has an enormous heritage of hop biodiversity that need to be exploited and studied. The preservation and valorization through the characterization of the existent biodiversity is a primary goal of the European Green Deal 2023–2030. The aim of this study was to acquire information on the biodiversity of Italian wild hops. Methods: Genetic characterization of sixty accessions was done resorting to Single Sequence Repeated (SSR) markers. Phytochemical characterization of wild hops was achieved using: (i) high-performance liquid chromatography with ultraviolet detection for bitter acids quantification, (ii) steam distillation for essential oils quantification and (iii) Gas Chromatography-Mass Spectrometry for the determination of the aromatic profile. Results: The eight SSR primers showed high Polymorphic Information Content (PIC), especially HlGA23. α-Acids reached values between 0 and 4.125. The essential oils analysis highlighted variability within the studied population, with some accessions characterized by important spicy fraction, and others by fruity and floral notes. Conclusions: The present study allowed the characterization of Italian wild hops and demonstrated an interesting biodiversity. Part of this biodiversity have been shown to be potentially suitable for use in brewing. Moreover, several genotypes could be used in breeding programs to obtain new more sustainable varieties.
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15
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Gregory ER, Bakhaider RF, Gomez GF, Huang R, Moser EAS, Gregory RL. Evaluating hop extract concentrations found in commercial beer to inhibit Streptococcus mutans biofilm formation. J Appl Microbiol 2022; 133:1333-1340. [PMID: 35598180 PMCID: PMC9543398 DOI: 10.1111/jam.15632] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 03/25/2022] [Accepted: 05/17/2022] [Indexed: 11/29/2022]
Abstract
AIMS The purpose of this study was to compare the effect of hop extracts with diverse β-acid concentrations on Streptococcus mutans biofilm formation. METHODS AND RESULTS Ten different hop extracts, with α-acid concentrations similar to those found in commercial beer products and β-acid concentrations ranging from 2.6 to 8.1%, were added to distilled water to make standardized concentrations. S. mutans isolates were treated with hop extract dilutions varying from 1:2 to 1:256. The minimum inhibitory, minimum bactericidal, and minimum biofilm inhibitory concentrations were determined and the optical density was evaluated. Live/dead staining confirmed the bactericidal effects. Biofilm formation of several strains of S. mutans was significantly inhibited by hop extract dilutions of 1:2, 1:4, 1:8, 1:16, and 1:32. Strong negative correlations were observed between α- and β-acid concentrations of the hop extracts and S. mutans total growth and biofilm formation. CONCLUSIONS The use of hop extracts prepared similarly to commercial beer decreased S. mutans biofilm formation. SIGNIFICANCE AND IMPACT OF THE STUDY The inclusion of hops in the commercial beer products may provide beneficial health effects. Further studies are warranted to determine an effect in vivo on the development of dental caries.
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Affiliation(s)
- Eric R Gregory
- Department of Pharmacy Services, The University of Kansas Health System, Kansas City, KS, USA
| | - Renad F Bakhaider
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
| | - Grace F Gomez
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
| | - Ruijie Huang
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
| | - Elizabeth A S Moser
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Richard L Gregory
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
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16
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17
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Hop (Humulus lupulus L.) Essential Oils and Xanthohumol Derived from Extraction Process Using Solvents of Different Polarity. HORTICULTURAE 2022. [DOI: 10.3390/horticulturae8050368] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This study evaluates the content of essential oils (EOs) and prenylated flavonoid Xanthohumol (XN) in extracts of Slovenian hops, cultivar Aurora, obtained by using fluids of different polarity. It is a continuation of our previous work, investigating the extraction of bitter acids from hops. Extraction was conducted semi-continuously, using sub- and supercritical fluids of different polarity, i.e., carbon dioxide (CO2) and propane as non-polar and dimethyl ether (DME) as the polar solvent. The experiments explored a temperature range between 20 °C and 80 °C and pressures ranging from 50 bar to 150 bar. The content of XN in extracts was analysed using high-performance liquid chromatography and experiments demonstrated the largest concentration of XN was obtained using DME. In order to analyse the EO components in extracts, connected with a distinct odour, the steam distillation of extracts was performed and GC analysis was employed. Hop oil derived from CO2 extracts at specific conditions, had the highest relative concentration of linalool, β-caryophyllene and α-humulene, and oil derived from propane extracts had the highest content of all other five selected components (myrcene, geraniol, farnesene, α-selinene and δ-cadinene). The relative content of the investigated EO components in DME extracts was similar to that in propane extracts.
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18
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Castro R, Díaz AB, Durán-Guerrero E, Lasanta C. Influence of different fermentation conditions on the analytical and sensory properties of craft beers: Hopping, fermentation temperature and yeast strain. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2021.104278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Sun S, Wang X, Yuan A, Liu J, Li Z, Xie D, Zhang H, Luo W, Xu H, Liu J, Nie C, Zhang H. Chemical constituents and bioactivities of hops (
Humulus lupulus L
.) and their effects on beer‐related microorganisms. Food Energy Secur 2022. [DOI: 10.1002/fes3.367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Shaokang Sun
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Xiaochen Wang
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Ai Yuan
- State Key Laboratory of Biobased Material and Green Papermaking School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Jianlin Liu
- College of Chemical Engineering China University of Petroleum (East China) Qingdao China
| | - Zebin Li
- State Key Laboratory of Biobased Material and Green Papermaking School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Dongxiao Xie
- Biology Institute Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Huimin Zhang
- College of Life Sciences Shandong Normal University Jinan China
| | - Wenqing Luo
- Global Leaders College Yonsei University Seoul Korea
| | - Hengyuan Xu
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Jinshang Liu
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Cong Nie
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Haojun Zhang
- Key Microbiology Laboratory of Shandong Province School of Bioengineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
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20
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Cid-Samamed A, Rakmai J, Mejuto JC, Simal-Gandara J, Astray G. Cyclodextrins inclusion complex: Preparation methods, analytical techniques and food industry applications. Food Chem 2022; 384:132467. [PMID: 35219231 DOI: 10.1016/j.foodchem.2022.132467] [Citation(s) in RCA: 81] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 02/07/2022] [Accepted: 02/12/2022] [Indexed: 01/19/2023]
Abstract
This review offers a vision of the chemical behaviour of natural ingredients, synthetic drugs and other related compounds complexed using cyclodextrins. The review takes care of different sections related to i) the inclusion complexes formation with cyclodextrins, ii) the determination of the inclusion formation constant, iii) the most used methods to prepare host inclusion in the non-polar cavity of cyclodextrins and iv) the analytical techniques to evidence host inclusion. The review provides different literature that shows the application of cyclodextrins to improve physical, chemical, and biological characteristics of food compounds including solubility, stability and their elimination/masking. Moreover, the review also offers examples of commercial food/supplement products of cyclodextrins to indicate that cyclodextrins can be used to generate biotechnological substances with innovative properties and improve the development of food products.
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Affiliation(s)
- Antonio Cid-Samamed
- Universidade de Vigo, Departamento de Química Física, Facultade de Ciencias, Ourense 32004, España.
| | - Jaruporn Rakmai
- Kasetsart Agricultural and Agro-Industrial Product Improvement Institute (KAPI), Kasetsart University, Bangkok 10900, Thailand.
| | - Juan Carlos Mejuto
- Universidade de Vigo, Departamento de Química Física, Facultade de Ciencias, Ourense 32004, España.
| | - Jesus Simal-Gandara
- Universidade de Vigo, Nutrition and Bromatology Group, Department of Analytical Chemistry and Food Science, Faculty of Science, Ourense E-32004, Spain.
| | - Gonzalo Astray
- Universidade de Vigo, Departamento de Química Física, Facultade de Ciencias, Ourense 32004, España.
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21
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Hong K, Xu Z, Wang L, Johnpaul A, Cheng Y, Lv C, Ma C. Varietal differences in the phytochemical components’ accumulation and aroma profile of three Humulus lupulus cultivars. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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22
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Su X, Hurley K, Xu Z, Xu Y, Rutto L, O'Keefe S, Scoggins H, Yin Y. Performance of alternative drying techniques on hop (Humulus lupulus L.) aroma quality: An HS-SPME-GC-MS-O and chemometrics combined approach. Food Chem 2022; 381:132289. [PMID: 35123222 DOI: 10.1016/j.foodchem.2022.132289] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 11/26/2022]
Abstract
Economically feasible and effective hop drying strategies are urgently needed to respond to the increasing number of microbrewers in US. In this study, hops were dried by dehydrator-drying (52 °C), oven-drying (52 °C) and freeze-drying (25 °C) until the final moisture content reached 8-10%. Headspace solid-phase microextraction-gas chromatography-mass spectrometry-olfactometry (HS-SPME-GC-MS-O) was employed to analyze the aroma profiles in all dried hops. Methyl octanoate, β-myrcene, trans-α-bergamotene, linalool and geraniol were perceived as high-intensity aromas in all samples. Generally, dehydrator-dried hops contained the highest contents of aroma compounds among all groups, showing an increase of 5-23% and 6-37% when compared to freeze- and oven-dried hops, respectively. Principal component and hierarchical cluster analyses also revealed aroma content differences from three drying methods. Dehydrator drying at 52 °C was therefore considered as an alternative and promising drying approach for smaller-scale hop processing, which can largely benefit regional producers and local craft breweries.
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Affiliation(s)
- Xueqian Su
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
| | - Ken Hurley
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
| | - Zhiyuan Xu
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
| | - Yixiang Xu
- Agricultural Research Station, Virginia State University, 1 Hayden Dr, Petersburg, VA 23806, USA.
| | - Laban Rutto
- Department of Agriculture, Virginia State University, 1 Hayden Dr, Petersburg, VA 23806, USA.
| | - Sean O'Keefe
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
| | - Holly Scoggins
- School of Plant & Environmental Sciences, Virginia Polytechnic Institute and State University, 490 W Campus Dr, Blacksburg, VA 24061, USA.
| | - Yun Yin
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
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23
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Zugravu CA, Bohiltea RE, Salmen T, Pogurschi E, Otelea MR. Antioxidants in Hops: Bioavailability, Health Effects and Perspectives for New Products. Antioxidants (Basel) 2022; 11:antiox11020241. [PMID: 35204124 PMCID: PMC8868281 DOI: 10.3390/antiox11020241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/23/2022] [Accepted: 01/26/2022] [Indexed: 12/24/2022] Open
Abstract
Hop plant (Humulus lupulus L.) has been used by humans for ages, presumably first as a herbal remedy, then in the manufacturing of different products, from which beer is the most largely consumed. Female hops cones have different useful chemical compounds, an important class being antioxidants, mainly polyphenols. This narrative review describes the main antioxidants in hops, their bioavailability and biological effects, and the results obtained by now in the primary and secondary prevention of several non-communicable diseases, such as the metabolic syndrome related diseases and oncology. This article presents in vitro and in vivo data in order to better understand what was accomplished in terms of knowledge and practice, and what needs to be clarified by additional studies, mainly regarding xantohumol and its derivates, as well as regarding the bitter acids of hops. The multiple protective effects found by different studies are hindered up to now by the low bioavailability of some of the main antioxidants in hops. However, there are new promising products with important health effects and perspectives of use as food supplements, in a market where consumers increasingly search for products originating directly from plants.
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Affiliation(s)
- Corina-Aurelia Zugravu
- Department of Hygiene and Ecology, “Carol Davila” University of Medicine and Pharmacy, 050463 Bucharest, Romania; or
| | - Roxana-Elena Bohiltea
- Department of Obstetrics and Gynecology, “Carol Davila” University of Medicine and Pharmacy Bucharest, 020021 Bucharest, Romania; or
| | - Teodor Salmen
- Department of Diabetes, Nutrition and Metabolic Diseases, “Prof. Dr. N.C.Paulescu” National Institute of Diabetes, 030167 Bucharest, Romania
- Correspondence: ; Tel.: +40-743526731
| | - Elena Pogurschi
- Faculty of Animal Productions Engineering and Management, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 57 Marasti Blvd, 011464 Bucharest, Romania; or
| | - Marina Ruxandra Otelea
- Clinical Department 5, “Carol Davila” University of Medicine and Pharmacy, 050463 Bucharest, Romania; or
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24
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al-Rifaie MM, Cavazza M. Evolutionary Optimisation of Beer Organoleptic Properties: A Simulation Framework. Foods 2022; 11:foods11030351. [PMID: 35159509 PMCID: PMC8833895 DOI: 10.3390/foods11030351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/20/2021] [Accepted: 01/21/2022] [Indexed: 01/27/2023] Open
Abstract
Modern computational techniques offer new perspectives for the personalisation of food properties through the optimisation of their production process. This paper addresses the personalisation of beer properties in the specific case of craft beers where the production process is more flexible. Furthermore, this work presents a solution discovery method that could be suitable for more complex, industrial setups. An evolutionary computation technique was used to map brewers’ desired organoleptic properties to their constrained ingredients to design novel recipes tailored for specific brews. While there exist several mathematical tools, using the original mathematical and chemistry formulas, or machine learning models that deal with the process of determining beer properties based on the predetermined quantities of ingredients, this work investigates an automated quantitative ingredient-selection approach. The process, which was applied to this problem for the first time, was investigated in a number of simulations by “cloning” several commercial brands with diverse properties. Additional experiments were conducted, demonstrating the system’s ability to deal with on-the-fly changes to users’ preferences during the optimisation process. The results of the experiments pave the way for the discovery of new recipes under varying preferences, therefore facilitating the personalisation and alternative high-fidelity reproduction of existing and new products.
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Affiliation(s)
- Mohammad Majid al-Rifaie
- School of Computing & Mathematical Sciences, University of Greenwich, London SE10 9LS, UK
- Correspondence:
| | - Marc Cavazza
- National Institute of Informatics, Tokyo 101-8430, Japan;
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25
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Eriksen RL, Padgitt-Cobb LK, Randazzo AM, Hendrix DA, Henning JA. Gene Expression of Agronomically Important Secondary Metabolites in cv. ‘USDA Cascade’ Hop (Humulus lupulus L.) Cones during Critical Developmental Stages. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2021. [DOI: 10.1080/03610470.2021.1973328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Renée L. Eriksen
- Forage Seed and Cereal Research Unit, USDA Agricultural Research Service, Corvallis, OR, U.S.A
| | | | - Angela M. Randazzo
- Department of Crop and Soil Science, Oregon State University, Corvallis, OR, U.S.A
| | - David A. Hendrix
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR, U.S.A
- School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, U.S.A
| | - John A. Henning
- Forage Seed and Cereal Research Unit, USDA Agricultural Research Service, Corvallis, OR, U.S.A
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26
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Rodrigues Arruda T, Fontes Pinheiro P, Ibrahim Silva P, Campos Bernardes P. Exclusive Raw Material for Beer Production? Addressing Greener Extraction Techniques, the Relevance, and Prospects of Hops (Humulus lupulus L.) for the Food Industry. FOOD BIOPROCESS TECH 2021. [DOI: 10.1007/s11947-021-02716-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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27
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DFT study of the radical scavenging activity of isoxanthohumol, humulones (α-acids), and iso-α-acids from beer. Struct Chem 2021. [DOI: 10.1007/s11224-021-01780-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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28
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Kunej U, Jakše J, Radišek S, Štajner N. Identification and Characterization of Verticillium nonalfalfae-Responsive MicroRNAs in the Roots of Resistant and Susceptible Hop Cultivars. PLANTS (BASEL, SWITZERLAND) 2021; 10:1883. [PMID: 34579416 PMCID: PMC8471970 DOI: 10.3390/plants10091883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/30/2021] [Accepted: 09/09/2021] [Indexed: 11/27/2022]
Abstract
MicroRNAs are 21- to 24-nucleotide-long, non-coding RNA molecules that regulate gene expression at the post-transcriptional level. They can modulate various biological processes, including plant response and resistance to fungal pathogens. Hops are grown for use in the brewing industry and, recently, also for the pharmaceutical industry. Severe Verticillium wilt caused by the phytopathogenic fungus Verticillium nonalfalfae, is the main factor in yield loss in many crops, including hops (Humulus lupulus L.). In our study, we identified 56 known and 43 novel miRNAs and their expression patterns in the roots of susceptible and resistant hop cultivars after inoculation with V. nonalfalfae. In response to inoculation with V. nonalfalfae, we found five known and two novel miRNAs that are differentially expressed in the susceptible cultivar and six known miRNAs in the resistant cultivar. Differentially expressed miRNAs target 49 transcripts involved in protein localization and pigment synthesis in the susceptible cultivar, whereas they are involved in transcription factor regulation and hormone signalling in the resistant cultivar. The results of our study suggest that the susceptible and resistant hop cultivars respond differently to V. nonalfalfae inoculation at the miRNA level and that miRNAs may contribute to the successful defence of the resistant cultivar.
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Affiliation(s)
- Urban Kunej
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
| | - Jernej Jakše
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
| | - Sebastjan Radišek
- Plant Protection Department, Slovenian Institute of Hop Research and Brewing, 3310 Žalec, Slovenia;
| | - Nataša Štajner
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
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Castro P, Luz E, Moreira G. Dataset for Hop varieties classification. Data Brief 2021; 38:107312. [PMID: 34485642 PMCID: PMC8397904 DOI: 10.1016/j.dib.2021.107312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/14/2021] [Accepted: 08/19/2021] [Indexed: 12/05/2022] Open
Abstract
Humulus lupulus L., also known as hops, is a vine whose flowers are a major component in brewing. It delivers flavor, bitterness, and aroma to beer and also aids in foam stabilization. Furthermore, it plays an important role in beer conservation due to its antimicrobial and antioxidant properties, which have recently been studied for food preservation. Hops can also be found in the production of cosmetics and is considered healthy food. There are more than 250 cataloged varieties of hops, and among the main attributes that differ from each other are alpha-acids, beta-acids, and essential oils. Those components give the beer a unique combination of characteristics, and may even influence its category. There are many ways to identify the hop variety from its acids and essential oils using methods such as chromatography, mass spectrometry, capillary electrophoresis, and nuclear magnetic resonance. However, these methods demand expensive and complex equipment, inaccessible or unavailable to most beer producers. In this work, we present a database that includes 1592 images of hop leaves, from 12 popular hop varieties in southeastern Brazil. From these images, it is possible to explore methods of pattern recognition and machine learning to classify hop varieties
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Affiliation(s)
- Pedro Castro
- Computing Department, Federal University of Ouro Preto, Ouro Preto-MG 35400-000, Brazil
| | - Eduardo Luz
- Computing Department, Federal University of Ouro Preto, Ouro Preto-MG 35400-000, Brazil
| | - Gladston Moreira
- Computing Department, Federal University of Ouro Preto, Ouro Preto-MG 35400-000, Brazil
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Carbone K, Bianchi G, Petrozziello M, Bonello F, Macchioni V, Parisse B, De Natale F, Alilla R, Cravero MC. Tasting the Italian Terroir through Craft Beer: Quality and Sensory Assessment of Cascade Hops Grown in Central Italy and Derived Monovarietal Beers. Foods 2021; 10:foods10092085. [PMID: 34574195 PMCID: PMC8467402 DOI: 10.3390/foods10092085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/25/2021] [Accepted: 08/31/2021] [Indexed: 11/30/2022] Open
Abstract
The present study aimed to chemically and sensorially characterize hop samples, cv Cascade, grown in two different Italian regions (Latium and Tuscany) as well as their derived beers by a multi analytical approach. Significant differences in bitter acid, oil and polyphenol content were observed for hop samples according to their origin. Gas chromatography-olfactometry analysis pointed out floral notes for Tuscany samples, where hops from Latium were characterized by spicy and resinous notes, correlated to the presence of sesquiterpenes. Differences in the molecular fingerprinting were also highlighted by Fourier–Transform Infrared Spectroscopy. The differences found in the hops were reflected in the beers, which were clearly recognized as distinct by a sensory panel. Both beer samples were mainly characterized by six aroma compounds (linalool, geraniol and β-damascenone, citronellol, 2-phenylethyl acetate, and 2-phenylethanol), three of which were potentially responsible for the geographic origin of the hops given their significantly different concentrations.
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Affiliation(s)
- Katya Carbone
- CREA Research Centre for Olive, Fruit and Citrus Crops, Via di Fioranello 52, 00134 Rome, Italy;
- Correspondence:
| | - Giulia Bianchi
- CREA Research Centre for Engineering and Agro-Food Processing, Via G. Venezian 26, 20133 Milan, Italy;
| | - Maurizio Petrozziello
- CREA Research Centre for Viticulture and Enology, Via P. Micca 35, 14100 Asti, Italy; (M.P.); (F.B.); (M.C.C.)
| | - Federica Bonello
- CREA Research Centre for Viticulture and Enology, Via P. Micca 35, 14100 Asti, Italy; (M.P.); (F.B.); (M.C.C.)
| | - Valentina Macchioni
- CREA Research Centre for Olive, Fruit and Citrus Crops, Via di Fioranello 52, 00134 Rome, Italy;
| | - Barbara Parisse
- CREA Research Centre for Agriculture and Environment, Via della Navicella 4, 00184 Rome, Italy; (B.P.); (F.D.N.); (R.A.)
| | - Flora De Natale
- CREA Research Centre for Agriculture and Environment, Via della Navicella 4, 00184 Rome, Italy; (B.P.); (F.D.N.); (R.A.)
| | - Roberta Alilla
- CREA Research Centre for Agriculture and Environment, Via della Navicella 4, 00184 Rome, Italy; (B.P.); (F.D.N.); (R.A.)
| | - Maria Carla Cravero
- CREA Research Centre for Viticulture and Enology, Via P. Micca 35, 14100 Asti, Italy; (M.P.); (F.B.); (M.C.C.)
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Gómez Pamies LC, Lataza Rovaletti MM, Martinez Amezaga NMJ, Benítez EI. The impact of pirodextrin addition to improve physicochemical parameters of sorghum beer. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.112040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Berton JKET, Verbeke Y, Van Durme B, Huvaere K. Radical Intermediates in the Degradation of Hop Acids. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:9642-9653. [PMID: 34382782 DOI: 10.1021/acs.jafc.1c02977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Radical formation in isohumulones was investigated under different types of stress, including temperature, transition metal ions, and hydrogen peroxide. Including dihydroisohumulones and tetrahydroisohumulones, as relevant analogues, allowed us to evaluate critical functionalities in radical formation. Using spin-trapping methodology with 5,5-dimethyl-1-pyrroline N-oxide and N-tert-butyl-α-phenylnitrone as relevant traps, followed by simulation of corresponding spin adducts, identification of incipient radicals was attempted. The isohexenoyl side chain in isohumulones, but not present in dihydro- and tetrahydroisohumulones, was most sensitive to radical formation. Kinetic profiles further demonstrated that radical formation in this moiety was accelerated in the presence of ferrous ions. Reactivity of parent six-membered-ring humulones in radical formation was different, as scavenging of free radical species was more important. Lupulones, despite similarity with humulones, showed a different behavior with an obvious radical decay pathway during ageing, mainly ascribed to radical formation on the ring structure. Quantification of final spin adducts allowed us to determine absolute importance of the different degradation pathways. Eventually, mechanisms are presented explaining why isohumulones are more prone to radical processes in (aut)oxidation and thermal decay than close relatives such as dihydroisohumulones.
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Affiliation(s)
| | - Yannis Verbeke
- EcoSynth NV, Industrielaan 12, 9800 Deinze, Belgium
- Department of Chemistry, Trainee Affiliated to the Odisee University of Applied Sciences Associated to the Catholic University of Leuven, Gebroeders de Smetstraat 1, 9000 Ghent, Belgium
| | - Bo Van Durme
- EcoSynth NV, Industrielaan 12, 9800 Deinze, Belgium
- Faculty of Sciences, Department of Chemistry, Trainee Affiliated to Ghent University, Krijgslaan 281, 9000 Ghent, Belgium
| | - Kevin Huvaere
- EcoSynth NV, Industrielaan 12, 9800 Deinze, Belgium
- Plinius Labs NV, Venecolaan 50G, 9880 Aalter, Belgium
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Morcol TB, Matthews PD, Kennelly EJ. Differences in Leaf Chemistry and Glandular Trichome Density between Wild Southwestern American Hop ( Humulus neomexicanus) and Commercial Hop Cultivars. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:7798-7814. [PMID: 34181402 DOI: 10.1021/acs.jafc.1c02710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The female flowers ("cones") of the hop plant (Humulus L.) produce compounds that contribute to the flavor and other properties of beer. Hop leaves and cones produce many of the same compounds, which also confer agronomic traits such as insect and disease resistance. Targeted and untargeted ultraperformance liquid chromatography-quadrupole time-of-flight-mass spectrometry with Waters MSE technology (UPLC-QTof-MSE) metabolomics were used to compare leaf phytochemical compositions of greenhouse-grown southwestern American wild Humulus neomexicanus (A. Nelson and Cockerell) Rydb. against a group of commercial hop cultivars consisting of both pure European Humulus lupulus L. and European-North American hybrids. Principal component analysis showed a clear distinction in chemical profiles between the two groups. H. neomexicanus leaves had a significantly higher content of total α acids (p = 4.4 × 10-9), total bitter acids (p = 2.6 × 10-6), cohumulone (p = 1.0 × 10-13), humulone + adhumulone (p = 9.1 × 10-4), and the prenylflavonoids xanthohumol (p = 0.013) and desmethylxanthohumol (p = 0.029) as well as significantly higher densities of glandular trichomes (p = 1.3 × 10-6), the biosynthetic site of those compounds. Most flavonol glycosides measured were also significantly more abundant in H. neomexicanus (p = 1.5 × 10-22 to 0.0027), whereas phenolic acids were consistently, but generally nonsignificantly (p > 0.05), more abundant in the cultivars. The higher bitter acid, prenylflavonoid, and flavonol glycoside content of H. neomexicanus leaves may help to confer more favorable insect and disease-resistance properties.
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Affiliation(s)
- Taylan B Morcol
- Department of Biological Sciences, Lehman College, City University of New York, 250 Bedford Park Boulevard West, Bronx, New York 10468, United States
- Ph.D. Program in Biology, The Graduate Center, City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Paul D Matthews
- Department of Research and Development, Hopsteiner, S.S. Steiner, Inc., 1 West Washington Avenue, Yakima, Washington 98903, United States
| | - Edward J Kennelly
- Department of Biological Sciences, Lehman College, City University of New York, 250 Bedford Park Boulevard West, Bronx, New York 10468, United States
- Ph.D. Program in Biology, The Graduate Center, City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
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Assessment of the Suitability of Aromatic and High-Bitter Hop Varieties (Humulus lupulus L.) for Beer Production in the Conditions of the Małopolska Vistula Gorge Region. FERMENTATION 2021. [DOI: 10.3390/fermentation7030104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The aim of the study was to assess the yield of cones and the quality of six hop varieties (“Iunga”, “Lubelski”, “Sybilla”, “Magnum”, “Lomik”, “Marynka”) in terms of their suitability for beer production, under the conditions of the Małopolska Vistula Gorge Region (21°53′ E; 51°16′ N) (2015–2017). The scope of the research included the determination of the yield of cones and their physicochemical properties, as well as determination of the contents of hop resins and essential oils. In bitter varieties, the ratio of alpha-acids to beta-acids was stable, while, in aromatic varieties, it was variable. In the essential oils of the studied hop varieties, compounds with myrcene and α-humulene were identified and dominated the profiles. “Iunga”, “Sybilla”, “Lubelski”, and “Lomik” were rich in monoterpene hydrocarbons, mainly myrcene, while there was a bit more α-humulene in the “Marynka” variety. “Magnum” was characterized by an even distribution of monoterpenes and sesquiterpenes. The “Magnum variety turned out the most useful for the brewing industry in this region. The Małopolska Vistula Gorge Region is a region where hops not only achieve a high yield of cones, but also good-quality. The bitterness and aroma content of the hops in this region is high.
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Kimura M, Ito T, Sato H, Higashi M. Theoretical study on isomerization of α-acids: A DFT calculation. Food Chem 2021; 364:130418. [PMID: 34192634 DOI: 10.1016/j.foodchem.2021.130418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 05/24/2021] [Accepted: 06/17/2021] [Indexed: 11/17/2022]
Abstract
The α-acids contained in hops are one of the ingredients of beer. The isomerization of α-acids produces iso-α-acids, the main source of bitterness in beer. In this study, the isomerization mechanism of the α-acid, cohumulone, was elucidated by using density functional theory in conjunction with the polarizable continuum model or 3D-RISM integral equation theory of liquids. The calculated reaction diagram is consistent with experimental results; the activation free energy difference between the cis and trans isomers is in good agreement with the experimental estimate. The activation energy difference results from solvation energy. Additionally, a calculation of NMR chemical shifts showed that the proton position of isocohumulone is different from that proposed previously. The effect of Mg2+ cation on the isomerization was also investigated. Both the activation and reaction free energy are stabilized by the presence of Mg2+, which is consistent with experimental results. Water solvation reduces the activation free energy.
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Affiliation(s)
- Minami Kimura
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Tadashi Ito
- Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
| | - Hirofumi Sato
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan; Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan; Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan; Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan.
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36
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Su X, Yin Y. Aroma characterization of regional Cascade and Chinook hops (Humulus lupulus L.). Food Chem 2021; 364:130410. [PMID: 34237617 DOI: 10.1016/j.foodchem.2021.130410] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/01/2021] [Accepted: 06/16/2021] [Indexed: 11/17/2022]
Abstract
Aroma compounds in Cascade and Chinook hops harvested from multiple Virginia locations were identified by gas chromatography-mass spectrometry-olfactometry (GC-MS-O) and aroma extract dilution analysis (AEDA). Selected aroma compounds were quantitated by combination of stable isotope dilution analysis (SIDA) and standard addition method (SAM). A total of 33 aroma-active compounds were detected in five samples with β-myrcene, methyl octanoate, geraniol and linalool being the predominant compounds based on their high flavor dilution (FD) factors and odor activity values (OAVs). L-Calamenene and germacrene B was the major characteristic component unique to Cascade and Chinook variety, respectively. Principal component analysis (PCA) showed distinctive aroma profiles for all samples except for Blacksburg and Petersburg Cascade. Hierarchical cluster analysis (HCA) reflected the higher contents of most aroma-active compounds in Meadowview Cascade and Chinook when compared to their counterparts. The significant variations suggested the potential influences of environmental factors and agronomic practices on hop aroma quality.
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Affiliation(s)
- Xueqian Su
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
| | - Yun Yin
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington Street SW, Blacksburg, VA 24061, USA.
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Puligundla P, Smogrovicova D, Mok C. Recent innovations in the production of selected specialty (non-traditional) beers. Folia Microbiol (Praha) 2021; 66:525-541. [PMID: 34097198 DOI: 10.1007/s12223-021-00881-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 05/27/2021] [Indexed: 10/21/2022]
Abstract
Customer demand for product diversity is the key driving force for innovations in the brewing industry. Specialty beers are regarded as a distinct group of beers different from two major types, lagers and ales, without established definitions or boundaries. Specialty beers, including low- to no-alcohol beer, low carbohydrate beer, gluten-free beer, sour beer, probiotic beer, and enriched beer, are exclusively brewed and developed keeping in mind their functionality, the health and wellbeing of the consumer, and emerging market trends. Compared with conventional beer-brewing, the production of specialty beers is technologically challenging and usually requires additional process steps, unique microorganisms, and special equipment, which in turn may incur additional costs. In addition, the maintenance of quality and stability of the products as well as consumer acceptability of the products are major challenges to successful commercialization. A harmonious integration of traditional brewing practices and modern technological approaches may hold potential for future developments. In the present review, latest developments in the fermentative production of selected specialty beers are discussed.
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Affiliation(s)
- Pradeep Puligundla
- Department of Food Science & Biotechnology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea.
| | - Daniela Smogrovicova
- Institute of Biotechnology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37, Bratislava, Slovak Republic
| | - Chulkyoon Mok
- Department of Food Science & Biotechnology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea
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38
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Sub- and Supercritical Extraction of Slovenian Hops ( Humulus lupulus L.) Aurora Variety Using Different Solvents. PLANTS 2021; 10:plants10061137. [PMID: 34205132 PMCID: PMC8229442 DOI: 10.3390/plants10061137] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/27/2021] [Accepted: 05/31/2021] [Indexed: 02/07/2023]
Abstract
This work investigates the efficiency of supercritical fluid extraction of hops with a variety of solvents including carbon dioxide (CO2), propane, sulfur hexafluoride (SF6), and dimethyl ether (DME) at various densities (low-density and high-density). Operating parameters were 50 bar, 100 bar and 150 bar and 20 °C, 40 °C, 60 °C and 80 °C for all solvents, respectively. The influence of process parameters on the total yield of extraction and content of bitter acids in the extracts has been investigated. The mathematical model based on Fick's second law well described the experimental extraction results. Furthermore, HPLC analysis has been used to determine α- and β-acids in extracts. The yield of bitter compounds in hop extracts was largely influenced by the type of solvent, the temperature and pressure applied during extraction. The results show that CO2 and propane were roughly equivalent to DME in solvating power, while SF6 was a poor solvent at the same conditions. The highest yield as well as the highest concentration of bitter acids in extracts were obtained by using DME, where the optimal operating conditions were 40 °C and 100 bar for the extraction of α-acids (max. concentration 9.6%), 60 °C and 50 bar for the extraction of β-acids (4.5%) and 60 °C and 150 bar for the maximum extraction yield (25.6%).
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Nath VS, Mishra AK, Awasthi P, Shrestha A, Matoušek J, Jakse J, Kocábek T, Khan A. Identification and characterization of long non-coding RNA and their response against citrus bark cracking viroid infection in Humulus lupulus. Genomics 2021; 113:2350-2364. [PMID: 34051324 DOI: 10.1016/j.ygeno.2021.05.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 04/22/2021] [Accepted: 05/25/2021] [Indexed: 02/06/2023]
Abstract
Long non-coding RNAs (lncRNAs) are a highly heterogeneous class of non-protein-encoding transcripts that play an essential regulatory role in diverse biological processes, including stress responses. The severe stunting disease caused by Citrus bark cracking viroid (CBCVd) poses a major threat to the production of Humulus lupulus (hop) plants. In this study, we systematically investigate the characteristics of the lncRNAs in hop and their role in CBCVd-infection using RNA-sequencing data. Following a stringent filtration criterion, a total of 3598 putative lncRNAs were identified with a high degree of certainty, of which 19% (684) of the lncRNAs were significantly differentially expressed (DE) in CBCVd-infected hop, which were predicted to be mainly involved in plant-pathogen interactions, kinase cascades, secondary metabolism and phytohormone signal transduction. Besides, several lncRNAs and CBCVd-responsive lncRNAs were identified as the precursor of microRNAs and predicted as endogenous target mimics (eTMs) for hop microRNAs involved in CBCVd-infection.
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Affiliation(s)
- Vishnu Sukumari Nath
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
| | - Ajay Kumar Mishra
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic.
| | - Praveen Awasthi
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
| | - Ankita Shrestha
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
| | - Jaroslav Matoušek
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
| | - Jernej Jakse
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
| | - Tomáš Kocábek
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
| | - Ahamed Khan
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Branišovská 31, 37005 České Budějovice, Czech Republic
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Zhang G, Zhang N, Yang A, Huang J, Ren X, Xian M, Zou H. Hop bitter acids: resources, biosynthesis, and applications. Appl Microbiol Biotechnol 2021; 105:4343-4356. [PMID: 34021813 DOI: 10.1007/s00253-021-11329-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 01/15/2023]
Abstract
Diversified members of hop bitter acids (α- and β-acids) have been found in hop (Humulus lupulus). Mixtures of hop bitter acids have been traditionally applied in brewing and food industries as bitterness flavors or food additives. Recent studies have discovered novel applications of hop bitter acids and their derivatives in medicinal and pharmaceutical fields. The increasing demands of purified hop bitter acid promoted biosynthesis efforts for the heterologous biosynthesis of objective hop bitter acids by engineered microbial factories. In this study, the updated information of hop bitter acids and their representative application in brewing, food, and medicine fields are reviewed. We also speculate future trends on the development of robust microbial cell factories and biotechnologies for the biosynthesis of hop bitter acids. KEY POINTS: • Structures and applications of hop bitter acids are summarized in this study. • Biosynthesis of hop bitter acids remains challenging. • We discuss potential strategies in the microbial production of hop bitter acids.
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Affiliation(s)
- Guoqing Zhang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Nan Zhang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Anran Yang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Jingling Huang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Xueni Ren
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Mo Xian
- CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
| | - Huibin Zou
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China. .,CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China.
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Kunej U, Jakše J, Radišek S, Štajner N. Core RNA Interference Genes Involved in miRNA and Ta-siRNA Biogenesis in Hops and Their Expression Analysis after Challenging with Verticillium nonalfalfae. Int J Mol Sci 2021; 22:4224. [PMID: 33921761 PMCID: PMC8073709 DOI: 10.3390/ijms22084224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/09/2021] [Accepted: 04/15/2021] [Indexed: 11/16/2022] Open
Abstract
RNA interference is an evolutionary conserved mechanism by which organisms regulate the expression of genes in a sequence-specific manner to modulate defense responses against various abiotic or biotic stresses. Hops are grown for their use in brewing and, in recent years, for the pharmaceutical industry. Hop production is threatened by many phytopathogens, of which Verticillium, the causal agent of Verticillium wilt, is a major contributor to yield losses. In the present study, we performed identification, characterization, phylogenetic, and expression analyses of three Argonaute, two Dicer-like, and two RNA-dependent RNA polymerase genes in the susceptible hop cultivar Celeia and the resistant cultivar Wye Target after infection with Verticillium nonalfalfae. Phylogeny results showed clustering of hop RNAi proteins with their orthologues from the closely related species Cannabis sativa, Morus notabilis and Ziziphus jujuba which form a common cluster with species of the Rosaceae family. Expression analysis revealed downregulation of argonaute 2 in both cultivars on the third day post-inoculation, which may result in reduced AGO2-siRNA-mediated posttranscriptional gene silencing. Both cultivars may also repress ta-siRNA biogenesis at different dpi, as we observed downregulation of argonaute 7 in the susceptible cultivar on day 1 and downregulation of RDR6 in the resistant cultivar on day 3 after inoculation.
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Affiliation(s)
- Urban Kunej
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
| | - Jernej Jakše
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
| | - Sebastjan Radišek
- Plant Protection Department, Slovenian Institute of Hop Research and Brewing, 3310 Žalec, Slovenia;
| | - Nataša Štajner
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (U.K.); (J.J.)
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Bioactive Compounds Obtained from Polish "Marynka" Hop Variety Using Efficient Two-Step Supercritical Fluid Extraction and Comparison of Their Antibacterial, Cytotoxic, and Anti-Proliferative Activities In Vitro. Molecules 2021; 26:molecules26082366. [PMID: 33921703 PMCID: PMC8073632 DOI: 10.3390/molecules26082366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/15/2021] [Accepted: 04/17/2021] [Indexed: 12/14/2022] Open
Abstract
Given the health-beneficial properties of compounds from hop, there is still a growing trend towards developing successful extraction methods with the highest yield and also receiving the products with high added value. The aim of this study was to develop efficient extraction method for isolation of bioactive compounds from the Polish "Marynka" hop variety. The modified two-step supercritical fluid extraction allowed to obtain two hop samples, namely crude extract (E1), composed of α-acids, β-acids, and terpene derivatives, as well as pure xanthohumol with higher yield than that of other available methods. The post-extraction residues (R1) were re-extracted in order to obtain extract E2 enriched in xanthohumol. Then, both samples were subjected to investigation of their antibacterial (anti-acne, anti-caries), cytotoxic, and anti-proliferative activities in vitro. It was demonstrated that extract (E1) possessed more beneficial biological properties than xanthohumol. It exhibited not only better antibacterial activity against Gram-positive bacteria strains (MIC, MBC) but also possessed a higher synergistic effect with commercial antibiotics when compared to xanthohumol. Moreover, cell culture experiments revealed that crude extract neither inhibited viability nor divisions of normal skin fibroblasts as strongly as xanthohumol. In turn, calculated selectivity indexes showed that the crude extract had from slightly to significantly better selective anti-proliferative activity towards cancer cells in comparison with xanthohumol.
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Ajiaikebaier D, Li Z, Lin T, Sun X, Wang B, Li J. Synthesis of pyranochalcone derivatives and their inhibitory effect on NF-κB activation. Bioorg Med Chem Lett 2021; 42:128042. [PMID: 33862226 DOI: 10.1016/j.bmcl.2021.128042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 11/15/2022]
Abstract
In an effort to identify novel inhibitors of nuclear factor kappa B (NF-κB), twenty five pyranochalcone derivatives were synthesized and evaluated for their in vitro activities against TNF-α induced NF-κB inhibition in HEK293T cells. Among all of these derivatives, several displaying the same acrylate moiety on the B ring exhibited potent inhibition, with IC50 values ranging from 0.29 to 10.46 μM. A functional study of the most potent of these compounds, designated 6b, revealed that it significantly suppressed the transcriptional expression of inflammatory factor IL-1β in lipopolysaccharide-induced RAW 264.7 macrophages, and also mildly inhibited CCL2, IL6 and TNF-α. In addition, compound 6b was found to inhibit IL-1β released in LPS-induced BMDM cells. This study demonstrates that the inhibitory effect of 6b on LPS-stimulated inflammatory mediator production in the mouse macrophage cell line RAW 264.7 correlates with the suppression of the NF-κB and MAPK signaling pathways.
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Affiliation(s)
- Dilidaer Ajiaikebaier
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, People's Republic of China
| | - Zuopeng Li
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, People's Republic of China
| | - TzuChun Lin
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
| | - Xinyu Sun
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
| | - Bianlin Wang
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, People's Republic of China.
| | - Jingya Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, People's Republic of China.
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44
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Arruda TR, Pinheiro PF, Silva PI, Bernardes PC. A new perspective of a well-recognized raw material: Phenolic content, antioxidant and antimicrobial activities and α- and β-acids profile of Brazilian hop (Humulus lupulus L.) extracts. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.110905] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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45
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A Metabolomic Approach to Beer Characterization. Molecules 2021; 26:molecules26051472. [PMID: 33800512 PMCID: PMC7962951 DOI: 10.3390/molecules26051472] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 11/16/2022] Open
Abstract
The consumers’ interest towards beer consumption has been on the rise during the past decade: new approaches and ingredients get tested, expanding the traditional recipe for brewing beer. As a consequence, the field of “beeromics” has also been constantly growing, as well as the demand for quick and exhaustive analytical methods. In this study, we propose a combination of nuclear magnetic resonance (NMR) spectroscopy and chemometrics to characterize beer. 1H-NMR spectra were collected and then analyzed using chemometric tools. An interval-based approach was applied to extract chemical features from the spectra to build a dataset of resolved relative concentrations. One aim of this work was to compare the results obtained using the full spectrum and the resolved approach: with a reasonable amount of time needed to obtain the resolved dataset, we show that the resolved information is comparable with the full spectrum information, but interpretability is greatly improved.
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46
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Eriksen RL, Padgitt-Cobb LK, Townsend MS, Henning JA. Gene expression for secondary metabolite biosynthesis in hop (Humulus lupulus L.) leaf lupulin glands exposed to heat and low-water stress. Sci Rep 2021; 11:5138. [PMID: 33664420 PMCID: PMC7970847 DOI: 10.1038/s41598-021-84691-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 02/05/2021] [Indexed: 01/31/2023] Open
Abstract
Hops are valued for their secondary metabolites, including bitter acids, flavonoids, oils, and polyphenols, that impart flavor in beer. Previous studies have shown that hop yield and bitter acid content decline with increased temperatures and low-water stress. We looked at physiological traits and differential gene expression in leaf, stem, and root tissue from hop (Humulus lupulus) cv. USDA Cascade in plants exposed to high temperature stress, low-water stress, and a compound treatment of both high temperature and low-water stress for six weeks. The stress conditions imposed in these experiments caused substantial changes to the transcriptome, with significant reductions in the expression of numerous genes involved in secondary metabolite biosynthesis. Of the genes involved in bitter acid production, the critical gene valerophenone synthase (VPS) experienced significant reductions in expression levels across stress treatments, suggesting stress-induced lability in this gene and/or its regulatory elements may be at least partially responsible for previously reported declines in bitter acid content. We also identified a number of transcripts with homology to genes shown to affect abiotic stress tolerance in other plants that may be useful as markers for breeding improved abiotic stress tolerance in hop. Lastly, we provide the first transcriptome from hop root tissue.
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Affiliation(s)
- Renée L. Eriksen
- grid.512836.b0000 0001 2205 063XUSDA Agricultural Research Service, Forage Seed and Cereal Research Unit, 3450 SW Campus Way, Corvallis, OR 97331 USA
| | - Lillian K. Padgitt-Cobb
- grid.4391.f0000 0001 2112 1969Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR 97331 USA
| | - M. Shaun Townsend
- grid.4391.f0000 0001 2112 1969Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331 USA
| | - John A. Henning
- grid.512836.b0000 0001 2205 063XUSDA Agricultural Research Service, Forage Seed and Cereal Research Unit, 3450 SW Campus Way, Corvallis, OR 97331 USA
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Ngameni B, Cedric K, Mbaveng AT, Erdoğan M, Simo I, Kuete V, Daştan A. Design, synthesis, characterization, and anticancer activity of a novel series of O-substituted chalcone derivatives. Bioorg Med Chem Lett 2021; 35:127827. [DOI: 10.1016/j.bmcl.2021.127827] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/28/2020] [Accepted: 01/18/2021] [Indexed: 12/11/2022]
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48
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GOMES FDO, GUIMARÃES BP, CEOLA D, GHESTI GF. Advances in dry hopping for industrial brewing: a review. FOOD SCIENCE AND TECHNOLOGY 2021. [DOI: 10.1590/fst.60620] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
| | | | - Duan CEOLA
- Universidade do Estado de Santa Catarina, Brasil
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Rutnik K, Knez Hrnčič M, Jože Košir I. Hop Essential Oil: Chemical Composition, Extraction, Analysis, and Applications. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1874413] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Ksenija Rutnik
- Department for Agrochemistry and Brewing, Slovenian Institute of Hop Research and Brewing, Žalec, Slovenia
| | - Maša Knez Hrnčič
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Maribor, Slovenia
| | - Iztok Jože Košir
- Department for Agrochemistry and Brewing, Slovenian Institute of Hop Research and Brewing, Žalec, Slovenia
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50
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Ronnebaum TA, Gardner SM, Christianson DW. An Aromatic Cluster in the Active Site of epi-Isozizaene Synthase Is an Electrostatic Toggle for Divergent Terpene Cyclization Pathways. Biochemistry 2020; 59:4744-4754. [PMID: 33270439 DOI: 10.1021/acs.biochem.0c00876] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The sesquiterpene cyclase epi-isozizaene synthase (EIZS) catalyzes the cyclization of farnesyl diphosphate to form the tricyclic precursor of the antibiotic albaflavenone. The hydrophobic active site is largely defined by aromatic residues that direct a multistep reaction sequence through multiple carbocation intermediates. The previous substitution of polar residues for a key aromatic residue, F96, converts EIZS into a high-fidelity sesquisabinene synthase: the F96S, F96M, and F96Q variants generate 78%, 91%, and 97% sesquisabinene A, respectively. Here, we report high-resolution X-ray crystal structures of two of these reprogrammed cyclases. The structures of the F96M EIZS-Mg2+3-risedronate and F96M EIZS-Mg2+3-inorganic pyrophosphate-benzyltriethylammonium cation complexes reveal structural changes in the F96 aromatic cluster that redirect the cyclization pathway leading from the bisabolyl carbocation intermediate in catalysis. The structure of the F96S EIZS-Mg2+3-neridronate complex reveals a partially occupied inhibitor and an enzyme active site caught in transition between open and closed states. Finally, three structures of wild-type EIZS complexed with the bisphosphonate inhibitors neridronate, pamidronate, and risedronate provide a foundation for understanding binding differences between wild-type and variant enzymes. These structures provide new insight regarding active site flexibility, particularly with regard to the potential for subtle expansion and contraction to accommodate ligands of varying sizes as well as bound water molecules. Additionally, these structures highlight the importance of conformational changes in the F96 aromatic cluster that could influence cation-π interactions with carbocation intermediates in catalysis.
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Affiliation(s)
- Trey A Ronnebaum
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Sarah M Gardner
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - David W Christianson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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