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Jiang L, Song J, Qi M, Cao Y, Li Y, Xu M, Li L, Zhang D, Wang C, Li H. Carbon and nitrogen sources consumption by ale and lager yeast strains: a comparative study during fermentation. Appl Microbiol Biotechnol 2023; 107:6937-6947. [PMID: 37704770 DOI: 10.1007/s00253-023-12778-9] [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: 06/08/2023] [Revised: 08/28/2023] [Accepted: 09/05/2023] [Indexed: 09/15/2023]
Abstract
The rapid and efficient consumption of carbon and nitrogen sources by brewer's yeast is critical for the fermentation process in the brewing industry. The comparison of the growth characterizations of typical ale and lager yeast, as well as their consumption preference to carbon and nitrogen sources were investigated in this study. Results showed that the ale strain grew faster and had a more extended stationary phase than the lager strain. However, the lager strain was more tolerant to the stressful environment in the later stage of fermentation. Meanwhile, the ale and lager yeast strains possessed varying preferences for metabolizing the specific fermentable sugar or free amino acid involved in the wort medium. The lager strain had a strong capacity to synthesize the extracellular invertase required for hydrolyzing sucrose as well as a strong capability to metabolize glucose and fructose. Furthermore, the lager strain had an advantage in consuming Lys, Arg, Val, and Phe, whereas the ale strain had a higher assimilation rate in consuming Tyr. These findings provide valuable insights into selecting the appropriate brewer's yeast strain based on the wort components for the industrial fermentation process. KEY POINTS: • The lager strain is more tolerant to the stressful environment. • The lager strain has the great capability to synthesize the extracellular invertase. • The assimilation efficiency of free amino acid varies between ale and lager.
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Affiliation(s)
- Lijun Jiang
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Jialin Song
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Mingming Qi
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Yuechao Cao
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Yueming Li
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Mei Xu
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Luxia Li
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Dongliang Zhang
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Chenjie Wang
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China
| | - Hongjun Li
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255049, Shandong, China.
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Vaštík P, Rosenbergová Z, Furdíková K, Klempová T, Šišmiš M, Šmogrovičová D. Potential of non-Saccharomyces yeast to produce non-alcoholic beer. FEMS Yeast Res 2022; 22:6653522. [PMID: 35918186 DOI: 10.1093/femsyr/foac039] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/14/2022] [Accepted: 07/29/2022] [Indexed: 11/12/2022] Open
Abstract
Recently, non-Saccharomyces yeast have become very popular in wine and beer fermentation. Their interesting abilities introduce novel aromatic profiles to the fermented product. In this study, screening of eight non-Saccharomyces yeast (Starmerella bombicola, Lindnera saturnus, Lindnera jadinii, ZygoSaccharomyces rouxii, Torulaspora delbrueckii, Pichia kluyveri, Candida pulcherrima, and Saccharomycodes ludwigii) revealed their potential in non-alcoholic beer production. Conditions for non-alcoholic beer production were optimised for all strains tested (except T. delbrueckii) with the best results obtained at temperature 10 to 15 °C for maximum of 10 days. Starmerella bombicola, an important industrial producer of biosurfactants, was used for beer production for the first time and was able to produce non-alcoholic beer even at 20 °C after 10 days of fermentation. Aromatic profile of the beer fermented with S. bombicola was neutral with no negative impact on organoleptic properties of the beer. The most interesting organoleptic properties were evaluated in beers fermented with L. jadinii and L. saturnus, which produced banana-flavoured beers with low alcohol content. This work confirmed the suitability of mentioned yeast to produce non-alcoholic beers and could serve as a steppingstone for further investigation.
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Affiliation(s)
- Peter Vaštík
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
| | - Zuzana Rosenbergová
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
| | - Katarína Furdíková
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
| | - Tatiana Klempová
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
| | - Michal Šišmiš
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
| | - Daniela Šmogrovičová
- Institute of Biotechnology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia
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3
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Romero-Rodríguez R, Durán-Guerrero E, Castro R, Díaz AB, Lasanta C. Evaluation of the Influence of the Microorganisms Involved in the Production of Beers on their Sensory Characteristics. FOOD AND BIOPRODUCTS PROCESSING 2022. [DOI: 10.1016/j.fbp.2022.06.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Zhao Y, Liu S, Yang Q, Han X, Zhou Z, Mao J. Saccharomyces cerevisiae strains with low-yield higher alcohols and high-yield acetate esters improve the quality, drinking comfort and safety of huangjiu. Food Res Int 2022; 161:111763. [DOI: 10.1016/j.foodres.2022.111763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 07/19/2022] [Accepted: 07/28/2022] [Indexed: 11/28/2022]
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Pinto FO, Lopes T, Vieira AM, Oliveira RO, Gomes FF, Fabricio MF, Ayub MAZ, Mendes SDC, Pagani DM, Valente P. Isolation, Selection and Characterization of Wild Yeasts with Potential for Brewing. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2022. [DOI: 10.1080/03610470.2022.2031777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Fernanda Otesbelgue Pinto
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Thais Lopes
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Audren Monteiro Vieira
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Renata Ott Oliveira
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Fernanda Fraga Gomes
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Mariana Fensterseifer Fabricio
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Marco Antônio Zachia Ayub
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Sandra Denise Camargo Mendes
- Laboratory of Analysis of Wines and Derivatives, Experimental Station of Videira, Santa Catarina State Agricultural Research and Rural Extension Agency – EPAGRI, Videira, Santa Catarina, Brazil
| | - Danielle Machado Pagani
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Patricia Valente
- Mycology Group, Department of Microbiology, Immunology and Parasitology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
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He L, Gao Y, Zhao L. Online coupling of bubbling extraction with gas chromatography-mass spectrometry for rapid quantitative analysis of volatiles in beer. J Chromatogr A 2022; 1665:462800. [DOI: 10.1016/j.chroma.2021.462800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 12/19/2021] [Accepted: 12/31/2021] [Indexed: 10/19/2022]
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The Potential of Traditional Norwegian KVEIK Yeast for Brewing Novel Beer on the Example of Foreign Extra Stout. Biomolecules 2021; 11:biom11121778. [PMID: 34944422 PMCID: PMC8698465 DOI: 10.3390/biom11121778] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/20/2021] [Accepted: 11/23/2021] [Indexed: 02/06/2023] Open
Abstract
The development of craft brewing has spurred huge interest in unusual and traditional technologies and ingredients allowing the production of beers that would fulfil consumers' growing demands. In this study, we evaluated the brewing performance of traditional Norwegian KVEIK yeast during the production of Foreign Extra Stout beer. The content of alcohol of the KVEIK-fermented beer was 5.11-5.58% v/v, the extract content was 5.05-6.66% w/w, and the pH value was 4.53-4.83. The KVEIK yeast was able to completely consume maltose and maltotriose. The mean concentration of glycerol in KVEIK-fermented beers was higher than in the control sample (1.51 g/L vs. 1.12 g/L, respectively). The use of KVEIK-type yeast can offer a viable method for increasing the concentration of phenolic compounds in beer and for boosting its antioxidative potential. The beers produced with KVEIK-type yeast had a total phenol content of 446.9-598.7 mg GAE/L, exhibited antioxidative potential of 0.63-1.08 mM TE/L in the DPPH• assay and 3.85-5.16 mM TE/L in the ABTS•+ assay, and showed a ferric ion reducing capacity (FRAP) of 3.54-4.14 mM TE/L. The KVEIK-fermented bears contained various levels of volatile compounds (lower or higher depending on the yeast strain) and especially of higher alcohols, such as 3-metylobutanol, 2-metylobutanol, and 1-propanol, or ethyl esters, such as ethyl acetate or decanoate, compared to the control beers. In addition, they featured a richer fruity aroma (apricot, dried fruit, apples) than the control beers fermented with a commercial US-05 strain.
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Cui DY, Ge JL, Song YM, Feng PP, Lin LC, Guo LY, Zhang CY. Regulating the ratio of higher alcohols to esters by simultaneously overexpressing ATF1 and deleting BAT2 in brewer's yeast Saccharomyces pastorianus. FOOD BIOSCI 2021. [DOI: 10.1016/j.fbio.2021.101231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9
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Statistical Significant Differences between Aroma Profiles of Beer Brewed from Sorghum. BEVERAGES 2021. [DOI: 10.3390/beverages7030056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
There is currently an increased demand for foodstuffs that are classified as gluten-free including beer. Beer produced using gluten-free grains has a distinct flavor profile that differs greatly from that of beer produced from gluten-containing grains. The chemical difference between beers made from these two different grain sources has been explored and some key differences have been identified. Here malt sources containing gluten (barley) and malt without gluten (sorghum) were used to determine which compounds are statistically different based upon their concentrations. A total of 14 (7 barley and 7 sorghum) small-batch beers were made from malt extract. The aroma profile was sampled using SPME with chemical separation and identification and quantification using GC-MS. As expected, the differences were not the result of unique compounds but compounds present in differing amounts. A total of 17 compounds were found to be present in beer brewed from both extracts but in amounts that were highly significantly different.
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10
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Abstract
Nowadays, in the beer sector, there is a wide range of products, which differ for the technologies adopted, raw materials used, and microorganisms involved in the fermentation processes. The quality of beer is directly related to the fermentation activity of yeasts that, in addition to the production of alcohol, synthesize various compounds that contribute to the definition of the compositional and organoleptic characteristics. The microbrewing phenomenon (craft revolution) and the growing demand for innovative and specialty beers has stimulated researchers and brewers to select new yeast strains possessing particular technological and metabolic characteristics. Up until a few years ago, the selection of starter yeasts used in brewing was exclusively carried out on strains belonging to the genus Saccharomyces. However, some non-Saccharomyces yeasts have a specific enzymatic activity that can help to typify the taste and beer aroma. These yeasts, used as a single or mixed starter with Saccharomyces strains, represent a new biotechnological resource to produce beers with particular properties. This review describes the role of Saccharomyces and non-Saccharomyces yeasts in brewing, and some future biotechnological perspectives.
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Carpena M, Fraga-Corral M, Otero P, Nogueira RA, Garcia-Oliveira P, Prieto MA, Simal-Gandara J. Secondary Aroma: Influence of Wine Microorganisms in Their Aroma Profile. Foods 2020; 10:foods10010051. [PMID: 33375439 PMCID: PMC7824511 DOI: 10.3390/foods10010051] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/23/2020] [Accepted: 12/23/2020] [Indexed: 12/16/2022] Open
Abstract
Aroma profile is one of the main features for the acceptance of wine. Yeasts and bacteria are the responsible organisms to carry out both, alcoholic and malolactic fermentation. Alcoholic fermentation is in turn, responsible for transforming grape juice into wine and providing secondary aromas. Secondary aroma can be influenced by different factors; however, the influence of the microorganisms is one of the main agents affecting final wine aroma profile. Saccharomyces cerevisiae has historically been the most used yeast for winemaking process for its specific characteristics: high fermentative metabolism and kinetics, low acetic acid production, resistance to high levels of sugar, ethanol, sulfur dioxide and also, the production of pleasant aromatic compounds. Nevertheless, in the last years, the use of non-saccharomyces yeasts has been progressively growing according to their capacity to enhance aroma complexity and interact with S. cerevisiae, especially in mixed cultures. Hence, this review article is aimed at associating the main secondary aroma compounds present in wine with the microorganisms involved in the spontaneous and guided fermentations, as well as an approach to the strain variability of species, the genetic modifications that can occur and their relevance to wine aroma construction.
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Affiliation(s)
- Maria Carpena
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
| | - Maria Fraga-Corral
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolonia, 5300-253 Bragança, Portugal
| | - Paz Otero
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Veterinary, University of Santiago of Compostela, 27002 Lugo, Spain
| | - Raquel A. Nogueira
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
| | - Paula Garcia-Oliveira
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolonia, 5300-253 Bragança, Portugal
| | - Miguel A. Prieto
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolonia, 5300-253 Bragança, Portugal
- Correspondence: (M.A.P.); (J.S.-G.)
| | - Jesus Simal-Gandara
- Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, E-32004 Ourense, Spain; (M.C.); (M.F.-C.); (P.O.); (R.A.N.); (P.G.-O.)
- Correspondence: (M.A.P.); (J.S.-G.)
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Lengeler KB, Stovicek V, Fennessy RT, Katz M, Förster J. Never Change a Brewing Yeast? Why Not, There Are Plenty to Choose From. Front Genet 2020; 11:582789. [PMID: 33240329 PMCID: PMC7677575 DOI: 10.3389/fgene.2020.582789] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/13/2020] [Indexed: 12/25/2022] Open
Abstract
Fermented foods and particularly beer have accompanied the development of human civilization for thousands of years. Saccharomyces cerevisiae, the dominant yeast in the production of alcoholic beverages, probably co-evolved with human activity. Considering that alcoholic fermentations emerged worldwide, the number of strains used in beer production nowadays is surprisingly low. Thus, the genetic diversity is often limited. This is among others related to the switch from a household brewing style to a more artisan brewing regime during the sixteenth century and latterly the development of single yeast isolation techniques at the Carlsberg Research Laboratory in 1883, resulting in process optimizations in the brewing industry. However, due to fierce competition within the beer market and the increasing demand for novel beer styles, diversification is becoming increasingly important. Moreover, the emergence of craft brewing has influenced big breweries to rediscover yeast as a significant contributor to a beer's aroma profile and realize that there is still room for innovation in the fermentation process. Here, we aim at giving a brief overview on how currently used S. cerevisiae brewing yeasts emerged and comment on the rationale behind replacing them with novel strains. We will present potential sources of yeasts that have not only been used in beer brewing before, including natural sources and sources linked to human activity but also an overlooked source, such as yeast culture collections. We will briefly comment on common yeast isolation techniques and finally touch on additional challenges for the brewing industry in replacing their current brewer's yeasts.
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Affiliation(s)
| | | | | | | | - Jochen Förster
- Carlsberg Research Laboratory, Carlsberg A/S, Copenhagen, Denmark
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Einfalt D. Barley-sorghum craft beer production with Saccharomyces cerevisiae, Torulaspora delbrueckii and Metschnikowia pulcherrima yeast strains. Eur Food Res Technol 2020. [DOI: 10.1007/s00217-020-03632-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractThe use of different yeast strains contributes to obtain insights into beer products with diverse sensory characteristics. In this study, three yeast species of different genera were selected to evaluate their fermentation performance and sensory profile for barley-sorghum beer production. Baley-sorghum wort was produced with 12.5°P and fermented with Saccharomyces cerevisiae, Torulaspora delbrueckii and Metschnikowia pulcherrima yeast strains. Differences were observed in terms of fermentation time and ability to ferment maltose. S. cerevisiae attenuated initial maltose concentration within 72 h, while M. pulcherrima and T. delbrueckii performed fermentation within 120 and 192 h, respectively. Both yeast strains simultaneously produced 11% and 23% lower ethanol concentrations, compared to S. cerevisiae with 37.9 g/L. Wort fermented with T. delbrueckii showed residual maltose concentration of 19.7 ± 4.1 g/L, resulting in significantly enhanced beer sweetness. S. cerevisiae produced significantly increased levels of higher alcohols, and obtained the highest scores for the sensory attribute body perception. Beer produced with T. delbrueckii contained significantly lower fermentative 2,3-butanediol and 2-methyl-1-butanol volatiles; this beer also showed reduced body perception. Beer conditioned with T. delbrueckii was significantly preferred over M. pulcherrima. Besides S. cerevisiae with high fermentative power, T. delbrueckii and M. pulcherrima were found to have reduced maltose fermenting abilities and provide significantly different sensory attributes to barley-sorghum beers.
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Johansson L, Nikulin J, Juvonen R, Krogerus K, Magalhães F, Mikkelson A, Nuppunen-Puputti M, Sohlberg E, de Francesco G, Perretti G, Gibson B. Sourdough cultures as reservoirs of maltose-negative yeasts for low-alcohol beer brewing. Food Microbiol 2020; 94:103629. [PMID: 33279061 DOI: 10.1016/j.fm.2020.103629] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/06/2020] [Accepted: 08/19/2020] [Indexed: 12/21/2022]
Abstract
De novo sourdough cultures were here assessed for their potential as sources of yeast strains for low-alcohol beer brewing. NGS analysis revealed an abundance of ascomycete yeasts, with some influence of grain type on fungal community composition. Ten different ascomycete yeast species were isolated from different sourdough types (including wheat, rye, and barley) and seven of these were screened for a number of brewing-relevant phenotypes. All seven were maltose-negative and produced less than 1% (v/v) alcohol from a 12 °Plato wort in initial fermentation trials. Strains were further screened for their bioflavouring potential (production of volatile aromas and phenolic notes, reduction of wort aldehydes), stress tolerance (temperature extremes, osmotic stress and ethanol tolerance) and flocculence. Based on these criteria, two species (Kazachstania servazzii and Pichia fermentans) were selected for 10 L-scale fermentation trials and sensory analysis of beers. The latter species was considered particularly suitable for production of low-alcohol wheat beers due to its production of the spice/clove aroma 4-vinylguaiacol, while the former showed potential for lager-style beers due to its clean flavour profile and tolerance to low temperature conditions.
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Affiliation(s)
- Linnea Johansson
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland; Metropolia University of Applied Sciences, Biotechnology and Food Engineering, P.O. Box 4000, FI-00079, Metropolia, Finland
| | - Jarkko Nikulin
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland; Chemical Process Engineering, Faculty of Technology, University of Oulu, P.O. Box 8000, FI-90014, Oulun, Yliopisto, Finland
| | - Riikka Juvonen
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Kristoffer Krogerus
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Frederico Magalhães
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Atte Mikkelson
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Maija Nuppunen-Puputti
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Elina Sohlberg
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland
| | - Giovanni de Francesco
- Italian Brewing Research Centre, University of Perugia, Via San Costanzo, 06126, Perugia, Italy
| | - Giuseppe Perretti
- Italian Brewing Research Centre, University of Perugia, Via San Costanzo, 06126, Perugia, Italy
| | - Brian Gibson
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044, VTT, Espoo, Finland.
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Volatile Compound Screening Using HS-SPME-GC/MS on Saccharomyces eubayanus Strains under Low-Temperature Pilsner Wort Fermentation. Microorganisms 2020; 8:microorganisms8050755. [PMID: 32443420 PMCID: PMC7285299 DOI: 10.3390/microorganisms8050755] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/14/2020] [Accepted: 05/15/2020] [Indexed: 12/01/2022] Open
Abstract
The recent isolation of the yeast Saccharomyces eubayanus has opened new avenues in the brewing industry. Recent studies characterized the production of volatile compounds in a handful set of isolates, utilizing a limited set of internal standards, representing insufficient evidence into the ability of the species to produce new and diverse aromas in beer. Using Headspace solid-phase microextraction followed by gas chromatography-mass spectrometry (HS-SPME-GC-MS), we characterized for the first time the production of volatile compounds in 10 wild strains under fermentative brewing conditions and compared them to a commercial lager yeast. S. eubayanus produces a higher number of volatile compounds compared to lager yeast, including acetate and ethyl esters, together with higher alcohols and phenols. Many of the compounds identified in S. eubayanus are related to fruit and floral flavors, which were absent in the commercial lager yeast ferment. Interestingly, we found a significant strain × temperature interaction, in terms of the profiles of volatile compounds, where some strains produced significantly greater levels of esters and higher alcohols. In contrast, other isolates preferentially yielded phenols, depending on the fermentation temperature. This work demonstrates the profound fermentation product differences between different S. eubayanus strains, highlighting the enormous potential of this yeast to produce new styles of lager beers.
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Designing New Yeasts for Craft Brewing: When Natural Biodiversity Meets Biotechnology. BEVERAGES 2020. [DOI: 10.3390/beverages6010003] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Beer is a fermented beverage with a history as old as human civilization. Ales and lagers are by far the most common beers; however, diversification is becoming increasingly important in the brewing market and the brewers are continuously interested in improving and extending the range of products, especially in the craft brewery sector. Fermentation is one of the widest spaces for innovation in the brewing process. Besides Saccharomyces cerevisiae ale and Saccharomyces pastorianus lager strains conventionally used in macro-breweries, there is an increasing demand for novel yeast starter cultures tailored for producing beer styles with diversified aroma profiles. Recently, four genetic engineering-free approaches expanded the genetic background and the phenotypic biodiversity of brewing yeasts and allowed novel costumed-designed starter cultures to be developed: (1) the research for new performant S. cerevisiae yeasts from fermented foods alternative to beer; (2) the creation of synthetic hybrids between S. cerevisiae and Saccharomyces non-cerevisiae in order to mimic lager yeasts; (3) the exploitation of evolutionary engineering approaches; (4) the usage of non-Saccharomyces yeasts. Here, we summarized the pro and contra of these approaches and provided an overview on the most recent advances on how brewing yeast genome evolved and domestication took place. The resulting correlation maps between genotypes and relevant brewing phenotypes can assist and further improve the search for novel craft beer starter yeasts, enhancing the portfolio of diversified products offered to the final customer.
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Lamounier KFR, Rodrigues PDO, Pasquini D, Dos Santos AS, Baffi MA. Ethanol Production and Other Bioproducts by Galactomyces geotrichum from Sugarcane Bagasse Hydrolysate. Curr Microbiol 2020; 77:738-745. [PMID: 31915987 DOI: 10.1007/s00284-019-01866-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 12/30/2019] [Indexed: 10/25/2022]
Abstract
This study investigated the enzymatic saccharification of alkaline-pretreated sugarcane bagasse (PSB) and the bioconversion of simple sugars from hydrolysates to ethanol and other bioproducts by the yeast Galactomyces geotrichum. The effects of percentage of dry substrate (3 and 10% w/v) and time of hydrolysis (24 and 72 h) in the content of released sugars were evaluated. The concentrations of monosaccharides and total reducing sugars (TRS) were calculated by high-performance liquid chromatography (HPLC) and by 3.5-dinitrosalicylic acid (DNS) method, respectively. The highest concentrations of TRS, glucose and xylose (73.96, 31.78 and 10.85 g/L, respectively) were obtained after the saccharification of 10% of PSB with Cellic CTec3 multi-enzyme cocktail (10 FPU/g cellulose) during 72 h (hydrolysate IV). G. geotrichum UFVJM-R150 fermented both glucose and xylose from the hydrolysates. The most efficient ethanol production was obtained after the fermentation of hydrolysate IV (9.99 g/L of ethanol, volumetric productivity-QP of 0.42 g/L.h and yield of ethanol as a function of the substrate-YP/S of 0.27 gethanol/gsugar). Besides ethanol, G. geotrichum was also able to produce other high-value chemicals such as isoamyl alcohol and galacturonic acid. This is the first report of the potential of the yeast G. geotrichum to fermentate sugarcane bagasse hydrolysates with the production of important bioproducts to further use by biorefineries.
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Affiliation(s)
| | - Patrisia de Oliveira Rodrigues
- Federal University of Uberlândia, Agricultural Sciences Institute (ICIAG-UFU), Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Daniel Pasquini
- Federal University of Uberlândia, Chemical Institute (IQ-UFU), Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Alexandre Soares Dos Santos
- Department of Basic Sciences (UFVJM), Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, Minas Gerais, 39803-371, Brazil
| | - Milla Alves Baffi
- Federal University of Uberlândia, Agricultural Sciences Institute (ICIAG-UFU), Uberlândia, Minas Gerais, 38405-320, Brazil.
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Janapala Y, Preiss T, Shirokikh NE. Control of Translation at the Initiation Phase During Glucose Starvation in Yeast. Int J Mol Sci 2019; 20:E4043. [PMID: 31430885 PMCID: PMC6720308 DOI: 10.3390/ijms20164043] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/10/2019] [Accepted: 08/15/2019] [Indexed: 12/13/2022] Open
Abstract
Glucose is one of the most important sources of carbon across all life. Glucose starvation is a key stress relevant to all eukaryotic cells. Glucose starvation responses have important implications in diseases, such as diabetes and cancer. In yeast, glucose starvation causes rapid and dramatic effects on the synthesis of proteins (mRNA translation). Response to glucose deficiency targets the initiation phase of translation by different mechanisms and with diverse dynamics. Concomitantly, translationally repressed mRNAs and components of the protein synthesis machinery may enter a variety of cytoplasmic foci, which also form with variable kinetics and may store or degrade mRNA. Much progress has been made in understanding these processes in the last decade, including with the use of high-throughput/omics methods of RNA and RNA:protein detection. This review dissects the current knowledge of yeast reactions to glucose starvation systematized by the stage of translation initiation, with the focus on rapid responses. We provide parallels to mechanisms found in higher eukaryotes, such as metazoans, for the most critical responses, and point out major remaining gaps in knowledge and possible future directions of research on translational responses to glucose starvation.
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Affiliation(s)
- Yoshika Janapala
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT 2601, Australia
| | - Thomas Preiss
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT 2601, Australia.
- Victor Chang Cardiac Research Institute, Darlinghurst, NSW 2010, Australia.
| | - Nikolay E Shirokikh
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT 2601, Australia.
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