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Pradal I, González-Alonso V, Wardhana YR, Cnockaert M, Wieme AD, Vandamme P, De Vuyst L. Various cold storage-backslopping cycles show the robustness of Limosilactobacillus fermentum IMDO 130101 as starter culture for Type 3 sourdough production. Int J Food Microbiol 2024; 411:110522. [PMID: 38160537 DOI: 10.1016/j.ijfoodmicro.2023.110522] [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: 04/29/2023] [Revised: 11/22/2023] [Accepted: 12/10/2023] [Indexed: 01/03/2024]
Abstract
Type 3 sourdoughs, which are starter culture-initiated and subsequently backslopped, are less studied than other sourdough types. Yet, they can serve as a model to assess how competitive starter culture strains for sourdough production are and how the microbial composition of such sourdoughs may evolve over time. In the present study, Limosilactobacillus fermentum IMDO 130101 was used to produce Type 3 sourdoughs, prepared from wheat and wholemeal wheat flours. Therefore, an initial fermentation of the flour-water mixture was performed at 30 °C for 48 h. This was followed by cold storage-backslopping cycles, consisting of refreshments (50 %, v/v), fermentation steps of 16 h, and storage at 4 °C each week, every three weeks, and every six weeks. The microbial dynamics (culture-dependent and -independent approaches) and metabolite dynamics were measured. In all sourdoughs produced, starter culture strain monitoring, following an amplicon sequence variant approach, showed that Liml. fermentum IMDO 130101 prevailed during one month when the sourdoughs were refreshed each week, during 24 weeks when the sourdoughs were refreshed every three weeks, and during 12 weeks when the sourdoughs were refreshed every six weeks. This suggested the competitiveness and robustness of Liml. fermentum IMDO 130101 for a considerable duration but also showed that the strain is prone to microbial interference. For instance, Levilactobacillus brevis and Pediococcus spp. prevailed upon further cold storage and backslopping. Also, although no yeasts were inoculated into the flour-water mixtures, Kazachstania unispora, Torulaspora delbrueckii, and Wickerhamomyces anomalus were the main yeast species found. They appeared after several weeks of storage and backslopping, which however indicated the importance of an interplay between LAB and yeast species in sourdoughs. The main differences among the mature sourdoughs obtained could be explained by the different flours used, the refreshment conditions applied, and the sampling time (before and after backslopping). Finally, the metabolite quantifications revealed continued metabolite production during the cold storage periods, which may impact the sourdough properties and those of the breads made thereof.
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Affiliation(s)
- Inés Pradal
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
| | - Víctor González-Alonso
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
| | - Yohanes Raditya Wardhana
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
| | - Anneleen D Wieme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium; BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium; BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Luc De Vuyst
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium.
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Wang X, Huangfu X, Zhao M, Zhao R. Chinese traditional sourdough steamed bread made by retarded sponge-dough method: Microbial dynamics, metabolites changes and bread quality during continuous propagation. Food Res Int 2023; 163:112145. [PMID: 36596098 DOI: 10.1016/j.foodres.2022.112145] [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: 05/29/2022] [Revised: 11/08/2022] [Accepted: 11/15/2022] [Indexed: 11/21/2022]
Abstract
Continuous propagation of Chinese traditional sourdough (CTS) was adopted to simulate the industrial production of sourdough steamed bread made by retarded sponge-dough method (SSB). Establishment of a stable microbial ecosystem occurred in mature sourdough within four days of continuous propagation, as revealed by both microbial and metabolic analyses. Lactobacillus sanfranciscensis and Kazachstania humilis were the predominant bacterial and fungal species in mature sourdoughs. Their relative abundances changed significantly from the first to third day of continuous propagation while exhibited relatively constant from the fourth day onwards despite the use of flour/water for each back-slopping step. Major changes in the metabolites and fermentative characteristics were observed during the initial three days and dough samples showed little temporal metabolic and fermentative variations from the fourth days onwards. Consequently, volumetric and textural properties as well as the volatile flavor compounds of SSB displayed rather high stability from the fourth day onwards.
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Affiliation(s)
- Xiangyu Wang
- College of Food Science and Engineering, Henan University of Technology, Lianhua Street, Hi-tech Development Zone, Zhengzhou, Henan Province 450001, China
| | - Xinyan Huangfu
- College of Food Science and Engineering, Henan University of Technology, Lianhua Street, Hi-tech Development Zone, Zhengzhou, Henan Province 450001, China
| | - Mengyuan Zhao
- College of Food Science and Engineering, Henan University of Technology, Lianhua Street, Hi-tech Development Zone, Zhengzhou, Henan Province 450001, China
| | - Renyong Zhao
- College of Food Science and Engineering, Henan University of Technology, Lianhua Street, Hi-tech Development Zone, Zhengzhou, Henan Province 450001, China.
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Khlestkin VK, Lockachuk MN, Savkina OA, Kuznetsova LI, Pavlovskaya EN, Parakhina OI. Taxonomic structure of bacterial communities in sourdoughs of spontaneous fermentation. Vavilovskii Zhurnal Genet Selektsii 2022; 26:385-393. [PMID: 35864940 PMCID: PMC9260649 DOI: 10.18699/vjgb-22-47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 03/27/2022] [Accepted: 03/27/2022] [Indexed: 11/25/2022] Open
Abstract
The article is devoted to the study of the microbiome of spontaneously fermented sourdoughs. The aim of the work was to study the inf luence of the technological parameters of sourdough propagations on the taxonomic structure of the microbiome of spontaneously fermented sourdoughs. Two spontaneously fermented sourdoughs were studied: dense rye sourdough and liquid rye sourdough, both prepared using the same batch of peeled rye f lour. To study the taxonomic structure of the sourdough microbiome in dynamics, the method of high-throughput sequencing of 16S rRNA gene fragments of microorganisms was used. It was shown that the technological parameters of sourdough (humidity, temperature) do not affect the taxonomic composition of the microbiome of dense rye or liquid rye sourdough at the phylum/class/genus level. It was found that during the f irst three days of propagations, bacteria from the phyla Proteobacteria and Firmicutes dominated in the microbial community. In the phylum Proteobacteria, microorganisms from the order Enterobacterales took a large share, which persisted for three days of backslopping. The phylum Firmicutes was represented by lactic acid bacteria of the genera Weissella, Lactobacillus,
Leuconostoc, Pediococcus, Lactococcus. It was established by classical microbiological methods that after a day of fermentation,
the number of lactic acid bacteria cells was signif icantly higher in liquid rye sourdough compared to dense
one. However, with further propagation of sourdoughs, the number of cells was comparable, while signif icant changes
occurred at the level of genera and species. It was shown that as the relative number of lactic acid bacteria of the genus
Lactobacillus increased, a gradual displacement of the coccal forms of Lactococcus, Leuconostoc, Weissella, Pediococcus
happened. With further propagation of sourdough after 10 days, the position of the dominant groups of bacteria was
occupied by representatives of the phylum Firmicutes, lactic acid bacteria of the genus Lactobacillus. The inf luence
of the mode and parameters of the sourdough on the species composition of lactobacilli, which demonstrated a low
bacterial diversity, is shown. In the f irst three days of propagations, lactobacilli L. curvatus, L. brevis, and Lactiplantibacil-
lus sp. dominated in both sourdoughs. After a month of backslopping, Fructilactobacillus sanfranciscensis and Companilactobacillus
sp. dominated in dense rye sourdough, and L. pontis dominated in liquid rye sourdough
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Affiliation(s)
- V. K. Khlestkin
- All-Russian Research Institute of Genetics and Breeding of Farm Animals – Branch of L.K. Ernst Federal Research Center for Animal Husbandry
| | - M. N. Lockachuk
- Saint-Petersburg Brunch of the Scientific Research Institute for the Baking Industry
| | - O. A. Savkina
- Saint-Petersburg Brunch of the Scientific Research Institute for the Baking Industry
| | - L. I. Kuznetsova
- Saint-Petersburg Brunch of the Scientific Research Institute for the Baking Industry
| | - E. N. Pavlovskaya
- Saint-Petersburg Brunch of the Scientific Research Institute for the Baking Industry
| | - O. I. Parakhina
- Saint-Petersburg Brunch of the Scientific Research Institute for the Baking Industry
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Ojeda-Linares CI, Solís-García IA, Casas A. Constructing Micro-Landscapes: Management and Selection Practices on Microbial Communities in a Traditional Fermented Beverage. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.821268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Colonche is a traditional beverage produced in Mexico by the fermentation of fruits of several cacti species. In the Meridional Central Plateau region of Mexico, where this study was conducted, it is mainly produced with fruits of Opuntia streptacantha; there, the producers perform spontaneous fermentation and/or fermentations through inoculums. Several factors can change the microbial community structure and dynamics through the fermentation process, but little attention has been directed to evaluate what type and extent of change the human practices have over the microbial communities. This study aims to assess the microbiota under spontaneous and inoculated fermentation techniques, the microorganisms present in the inoculums and containers, and the changes of microbiota during the process of producing colonche with different techniques. We used next-generation sequencing of the V3-V4 regions of the 16S rRNA gene and the ITS2, to characterize bacterial and fungal diversity associated with the different fermentation techniques. We identified 701 bacterial and 203 fungal amplicon sequence variants (ASVs) belonging to 173 bacterial and 187 fungal genera. The alpha and beta diversity analysis confirmed that both types of fermentation practices displayed differences in richness, diversity, and community structure. Richness of bacteria in spontaneous fermentation (0D = 136 ± 0.433) was higher than in the inoculated samples (0D = 128 ± 0.929), while fungal richness in the inoculated samples (0D = 32 ± 0.539) was higher than in spontaneous samples (0D = 19 ± 0.917). We identified bacterial groups like Lactobacillus, Leuconostoc, Pediococcus and the Saccharomyces yeast shared in ferments managed with different practices; these organisms are commonly related to the quality of the fermentation process. We identified that clay pots, where spontaneous fermentation is carried out, have an outstanding diversity of fungal and bacterial richness involved in fermentation, being valuable reservoirs of microorganisms for future fermentations. The inoculums displayed the lowest richness and diversity of bacterial and fungal communities suggesting unconscious selection on specific microbial consortia. The beta diversity analysis identified an overlap in microbial communities for both types of fermentation practices, which might reflect a shared composition of microorganisms occurring in the Opuntia streptacantha substrate. The variation in the spontaneous bacterial community is consistent with alpha diversity data, while fungal communities showed less differences among treatments, probably due to the high abundance and dominance of Saccharomyces. This information illustrates how traditional management guides selection and may drive changes in the microbial consortia to produce unique fermented beverages through specific fermentation practices. Although further studies are needed to analyze more specifically the advantages of each fermentation type over the quality of the product, our current analysis supports the role of traditional knowledge driving it and the relevance of plans for its conservation.
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Lluansí A, Llirós M, Oliver L, Bahí A, Elias-Masiques N, Gonzalez M, Benejam P, Cueva E, Termes M, Ramió-Pujol S, Malagón M, Amoedo J, Serrano M, Busquets D, Torreabla L, Sabat M, Buxó M, Cambra M, Serra-Pagès M, Delgado-Aros S, García-Gil LJ, Elias I, Aldeguer X. In vitro Prebiotic Effect of Bread-Making Process in Inflammatory Bowel Disease Microbiome. Front Microbiol 2021; 12:716307. [PMID: 34707578 PMCID: PMC8543021 DOI: 10.3389/fmicb.2021.716307] [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: 05/28/2021] [Accepted: 08/31/2021] [Indexed: 12/11/2022] Open
Abstract
Inflammatory bowel disease (IBD), including its two main categories (Crohn's disease and ulcerative colitis), has been linked both to gut microbiota and to diet. Bread is a daily food that has a potential capacity as a prebiotic. Our aim was to evaluate different bread-making processes and their effect on fecal colonic microbiota in IBD patients. The microbial composition of several sourdoughs and dough samples was analyzed by high-throughput sequencing of 16S and 18S rRNA genes. Three types of bread, which followed different bread-making processes, were in vitro digested and incubated with feces from IBD patients. Changes in gut microbiota were assessed by a quantitative polymerase chain reaction using specific bacterial sequence targets. Short-chain fatty acid production was also analyzed by gas chromatography. Lactobacillus sanfranciscensis was the dominant lactic acid bacteria species found in sourdough and bread doughs prepared using sourdough, whereas Saccharomyces cerevisiae was the most dominant yeast in all groups, especially in bread doughs before baking. Differences in microbial composition in raw bread doughs were more related to the type of dough and elaboration than to fermentation time lengths. The analysis of in vitro fecal incubations with bread conditions revealed an increase in most bacterial groups analyzed and short-chain fatty acid production, both in Crohn's disease and ulcerative colitis samples. Most remarkable increases in short-chain fatty acid production mirrored higher abundances of Roseburia species. The potential prebiotic properties observed were mainly obtained when using a high quantity of bread, regardless of bread type. Overall, this study highlights the bacterial dynamics within the bread-making process and the potential prebiotic effect in IBD patients.
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Affiliation(s)
- Aleix Lluansí
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain
| | - Marc Llirós
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain
| | | | - Anna Bahí
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain
| | | | | | | | | | | | | | | | | | | | - David Busquets
- Digestive Service, Hospital Universitari de Girona Dr. Josep Trueta, Girona, Spain
| | - Leyanira Torreabla
- Digestive Service, Hospital Universitari de Girona Dr. Josep Trueta, Girona, Spain
| | - Miriam Sabat
- Digestive Service, Hospital Universitari de Girona Dr. Josep Trueta, Girona, Spain
| | - Maria Buxó
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain
| | - Maria Cambra
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain
| | | | | | | | | | - Xavier Aldeguer
- Digestive Diseases and Microbiota Group, Institut d'Investigació Biomèdica de Girona, Salt, Spain.,GoodGut S.L., Girona, Spain.,Digestive Service, Hospital Universitari de Girona Dr. Josep Trueta, Girona, Spain
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6
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De Vuyst L, Comasio A, Kerrebroeck SV. Sourdough production: fermentation strategies, microbial ecology, and use of non-flour ingredients. Crit Rev Food Sci Nutr 2021; 63:2447-2479. [PMID: 34523363 DOI: 10.1080/10408398.2021.1976100] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Sourdough production is an ancient method to ferment flour from cereals for the manufacturing of baked goods. This review deals with the state-of-the-art of current fermentation strategies for sourdough production and the microbial ecology of mature sourdoughs, with a particular focus on the use of non-flour ingredients. Flour fermentation processes for sourdough production are typically carried out by heterogeneous communities of lactic acid bacteria and yeasts. Acetic acid bacteria may also occur, although their presence and role in sourdough production can be criticized. Based on the inoculum used, sourdough productions can be distinguished in fermentation processes using backslopping procedures, originating from a spontaneously fermented flour-water mixture (Type 1), starter culture-initiated fermentation processes (Type 2), and starter culture-initiated fermentation processes that are followed by backslopping (Type 3). In traditional recipes for the initiation and/or propagation of Type 1 sourdough productions, non-flour ingredients are often added to the flour-water mixture. These ingredients may be the source of an additional microbial inoculum and/or serve as (co-)substrates for fermentation. An example of the former is the addition of yoghurt; an example of the latter is the use of fruit juices. The survival of microorganisms transferred from the ingredients to the fermenting flour-water mixture depends on the competitiveness toward particular strains of the microbial species present under the harsh conditions of the sourdough ecosystem. Their survival and growth is also determined by the presence of the appropriate substrates, whether or not carried over by the ingredients added.
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Affiliation(s)
- Luc De Vuyst
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Andrea Comasio
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Simon Van Kerrebroeck
- Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel (VUB), Brussels, Belgium
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7
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Ramos L, Alonso-Hernando A, Martínez-Castro M, Morán-Pérez JA, Cabrero-Lobato P, Pascual-Maté A, Téllez-Jiménez E, Mujico JR. Sourdough Biotechnology Applied to Gluten-Free Baked Goods: Rescuing the Tradition. Foods 2021; 10:1498. [PMID: 34203323 PMCID: PMC8304676 DOI: 10.3390/foods10071498] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/13/2021] [Accepted: 06/16/2021] [Indexed: 12/20/2022] Open
Abstract
Recent studies suggest that the beneficial properties provided by sourdough fermentation may be translated to the development of new GF products that could improve their technological and nutritional properties. The main objective of this manuscript is to review the current evidence regarding the elaboration of GF baked goods, and to present the latest knowledge about the so-called sourdough biotechnology. A bibliographic search of articles published in the last 12 years has been carried out. It is common to use additives, such as hydrocolloids, proteins, enzymes, and emulsifiers, to technologically improve GF products. Sourdough is a mixture of flour and water fermented by an ecosystem of lactic acid bacteria (LAB) and yeasts that provide technological and nutritional improvements to the bakery products. LAB-synthesized biopolymers can mimic gluten molecules. Sourdough biotechnology is an ecological and cost-effective technology with great potential in the field of GF products. Further research is necessary to optimize the process and select species of microorganisms robust enough to be competitive in any circumstance.
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Affiliation(s)
- Laura Ramos
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
- Unidad de Citometría de Flujo y Separación Celular, Instituto Cajal, CSIC, 28002 Madrid, Spain
| | - Alicia Alonso-Hernando
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Miriam Martínez-Castro
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Jose Alejandro Morán-Pérez
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Patricia Cabrero-Lobato
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Ana Pascual-Maté
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Eduardo Téllez-Jiménez
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
| | - Jorge R. Mujico
- Facultad de Ciencias de la Salud, Universidad Isabel I, 09003 Burgos, Spain; (L.R.); (M.M.-C.); (J.A.M.-P.); (P.C.-L.); (A.P.-M.); (E.T.-J.); (J.R.M.)
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Calvert MD, Madden AA, Nichols LM, Haddad NM, Lahne J, Dunn RR, McKenney EA. A review of sourdough starters: ecology, practices, and sensory quality with applications for baking and recommendations for future research. PeerJ 2021; 9:e11389. [PMID: 34026358 PMCID: PMC8117929 DOI: 10.7717/peerj.11389] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 04/12/2021] [Indexed: 01/13/2023] Open
Abstract
The practice of sourdough bread-making is an ancient science that involves the development, maintenance, and use of a diverse and complex starter culture. The sourdough starter culture comes in many different forms and is used in bread-making at both artisanal and commercial scales, in countries all over the world. While there is ample scientific research related to sourdough, there is no standardized approach to using sourdough starters in science or the bread industry; and there are few recommendations on future directions for sourdough research. Our review highlights what is currently known about the microbial ecosystem of sourdough (including microbial succession within the starter culture), methods of maintaining sourdough (analogous to land management) on the path to bread production, and factors that influence the sensory qualities of the final baked product. We present new hypotheses for the successful management of sourdough starters and propose future directions for sourdough research and application to better support and engage the sourdough baking community.
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Affiliation(s)
- Martha D Calvert
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University (Virginia Tech), Blackburg, VA, United States of America.,Department of Applied Ecology, North Carolina State University, Raleigh, NC, United States of America
| | - Anne A Madden
- Department of Applied Ecology, North Carolina State University, Raleigh, NC, United States of America
| | - Lauren M Nichols
- Department of Applied Ecology, North Carolina State University, Raleigh, NC, United States of America
| | - Nick M Haddad
- Kellogg Biological Station and Department of Integrative Biology, Michigan State University, Hickory Corners, MI, United States of America
| | - Jacob Lahne
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University (Virginia Tech), Blackburg, VA, United States of America
| | - Robert R Dunn
- Department of Applied Ecology, North Carolina State University, Raleigh, NC, United States of America.,Center for Evolutionary Hologenomics, University of Copenhagen, Copenhagen, Denmark
| | - Erin A McKenney
- Department of Applied Ecology, North Carolina State University, Raleigh, NC, United States of America
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9
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A Species-Specific qPCR Method for Enumeration of Lactobacillus sanfranciscensis, Lactobacillus brevis, and Lactobacillus curvatus During Cocultivation in Sourdough. FOOD ANAL METHOD 2020. [DOI: 10.1007/s12161-020-01920-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Dynamics of microbial community and changes of metabolites during production of type Ι sourdough steamed bread made by retarded sponge-dough method. Food Chem 2020; 330:127316. [DOI: 10.1016/j.foodchem.2020.127316] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/20/2020] [Accepted: 06/09/2020] [Indexed: 12/23/2022]
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11
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Özel B, Şimşek Ö, Settanni L, Erten H. The influence of backslopping on lactic acid bacteria diversity in tarhana fermentation. Int J Food Microbiol 2020; 335:108886. [PMID: 32950916 DOI: 10.1016/j.ijfoodmicro.2020.108886] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 08/15/2020] [Accepted: 09/05/2020] [Indexed: 10/23/2022]
Abstract
Tarhana is produced at batch systems in which the microbiota has changed accordingly to the microbial load from ingredients. In order to stabilize the microbiota, the effects of backslopping carried out under different temperature regimes (25 and 30 °C), pH (3.70 and 4.00) and inoculation rates (5, 10 and 15%) on lactic acid bacteria (LAB) diversity were determined in tarhana dough. LAB and Total Aerobic Mesophilic Bacteria (TAMB) numbers increased in all tarhana dough samples subjected to backslopping. Temperature and pH significantly affected the microbiological diversity of tarhana whereas the different inoculation rates did not. Tarhana dough showed complex tarhana microbiota following backslopping at pH 4.00 independently on the temperature applied. When backslopping was carried out at pH 3.70 and 25 °C, tarhana microbiota stabilized and became steady after several cycles. The LAB species found in all dough samples after the final backslopping were Lactobacillus plantarum, Lactobacillus alimentarius and Lactobacillus brevis which were able to carry out the fermentation in all conditions tested. In order to obtain a stable presence of LAB populations at industrial level for tarhana production, this work showed that backslopping is recommended at pH 3.70 and 25 °C with any inoculation ratios.
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Affiliation(s)
- Burcu Özel
- Cukurova University, Faculty of Agriculture, Department of Food Engineering, 01330 Adana, Turkey; University of Pamukkale, Cal Vocational High School, Department of Food Processing, 20700 Denizli, Turkey.
| | - Ömer Şimşek
- University of Pamukkale, Faculty of Engineering, Department of Food Engineering, 20160 Denizli, Turkey.
| | - Luca Settanni
- Dipartimento Scienze Agrarie, Alimentari e Forestali, Università degli Studi di Palermo, Viale delle Scienze 4, 90128 Palermo, Italy.
| | - Huseyin Erten
- Cukurova University, Faculty of Agriculture, Department of Food Engineering, 01330 Adana, Turkey.
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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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13
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Abedfar A, Abbaszadeh S, Hosseininezhad M, Taghdir M. RETRACTED: Physicochemical and biological characterization of the EPS produced by L. cidophilus isolated from rice bran sourdough. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109373] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Menezes L, Sardaro MS, Duarte R, Mazzon R, Neviani E, Gatti M, De Dea Lindner J. Sourdough bacterial dynamics revealed by metagenomic analysis in Brazil. Food Microbiol 2020; 85:103302. [DOI: 10.1016/j.fm.2019.103302] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 08/02/2019] [Accepted: 08/10/2019] [Indexed: 12/12/2022]
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15
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Xu D, Zhang Y, Tang K, Hu Y, Xu X, Gänzle MG. Effect of Mixed Cultures of Yeast and Lactobacilli on the Quality of Wheat Sourdough Bread. Front Microbiol 2019; 10:2113. [PMID: 31552010 PMCID: PMC6746982 DOI: 10.3389/fmicb.2019.02113] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 08/27/2019] [Indexed: 11/20/2022] Open
Abstract
In this study, mixed starter cultures of yeast and lactobacilli were used for type I sourdough bread making to evaluate their ability to improve bread quality and increase the amount of flavor volatiles. Kazachstania humilis, Saccharomyces cerevisiae, Wickerhamomyces anomalus, and Lactobacillus sanfranciscensis DSM20451T and Lactobacillus sakei LS8 were used in different combinations to ferment wheat sourdough. S. cerevisiae produced the highest amount of CO2 among all strains and thus enhanced bread volume and crumb texture. S. cerevisiae also increased the free thiol level in bread dough, and this study confirms that thiol accumulation was not strongly related to the content of the glutenin macropolymer (GMP) or bread volume. The role of thiol exchange reactions on bread quality differs between long fermentation sourdough and straight dough with baker's yeast only. The influence of different starter cultures on wheat sourdough bread volatiles was established by using head space solid-phase microextraction and gas chromatography/mass spectrometry analysis (SPME-GC/MS). The sourdough breads fermented with a combination of lactobacilli and yeast had a more complex profile of volatiles, particularly with respect to esters.
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Affiliation(s)
- Dan Xu
- National Engineering Laboratory for Cereal Fermentation Technology, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
| | - Yao Zhang
- National Engineering Laboratory for Cereal Fermentation Technology, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
| | - Kaixing Tang
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
| | - Ying Hu
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
| | - Xueming Xu
- National Engineering Laboratory for Cereal Fermentation Technology, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Michael G. Gänzle
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
- College of Bioengineering and Food Science, Hubei University of Technology, Wuhan, China
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16
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Identification of lactic acid bacteria and yeasts, and characterization of food components of sourdoughs used in Japanese bakeries. J Biosci Bioeng 2019; 127:575-581. [DOI: 10.1016/j.jbiosc.2018.10.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 09/26/2018] [Accepted: 10/13/2018] [Indexed: 11/18/2022]
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17
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Cubillos FA, Gibson B, Grijalva-Vallejos N, Krogerus K, Nikulin J. Bioprospecting for brewers: Exploiting natural diversity for naturally diverse beers. Yeast 2019; 36:383-398. [PMID: 30698853 DOI: 10.1002/yea.3380] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 01/21/2019] [Accepted: 01/21/2019] [Indexed: 12/29/2022] Open
Abstract
The burgeoning interest in archaic, traditional, and novel beer styles has coincided with a growing appreciation of the role of yeasts in determining beer character as well as a better understanding of the ecology and biogeography of yeasts. Multiple studies in recent years have highlighted the potential of wild Saccharomyces and non-Saccharomyces yeasts for production of beers with novel flavour profiles and other desirable properties. Yeasts isolated from spontaneously fermented beers as well as from other food systems (wine, bread, and kombucha) have shown promise for brewing application, and there is evidence that such cross-system transfers have occurred naturally in the past. We review here the available literature pertaining to the use of nonconventional yeasts in brewing, with a focus on the origins of these yeasts, including methods of isolation. Practical aspects of utilizing nondomesticated yeasts are discussed, and modern methods to facilitate discovery of yeasts with brewing potential are highlighted.
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Affiliation(s)
- Francisco A Cubillos
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Millennium Institute for Integrative Biology (iBio), Santiago, Chile
| | - Brian Gibson
- Industrial Biotechnology and Food Solutions, VTT Technical Research Centre of Finland Ltd, Espoo, Finland
| | - Nubia Grijalva-Vallejos
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, Valencia, Spain
| | - Kristoffer Krogerus
- Industrial Biotechnology and Food Solutions, VTT Technical Research Centre of Finland Ltd, Espoo, Finland.,Department of Biotechnology and Chemical Technology, Aalto University, School of Chemical Technology, Espoo, Finland
| | - Jarkko Nikulin
- Industrial Biotechnology and Food Solutions, VTT Technical Research Centre of Finland Ltd, Espoo, Finland.,Chemical Process Engineering, Faculty of Technology, University of Oulu, Oulu, Finland
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18
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Application of the selected antifungal LAB isolate as a protective starter culture in pan whole-wheat sourdough bread. Food Control 2019. [DOI: 10.1016/j.foodcont.2018.08.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sadeghi A, Ebrahimi M, Sadeghi B, Mortazavi SA. Evaluation of safety and antifungal activity of Lactobacillus reuteri and Pediococcus diacetilactis isolates against aflatoxigenic Aspergillus flavus. BULGARIAN JOURNAL OF VETERINARY MEDICINE 2019. [DOI: 10.15547/bjvm.2046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Biocontrol of moulds by lactic acid bacteria (LAB) instead of antibiotics and chemical preservatives is a new approach in veterinary medicine. The aims of present research were to perform molecular identification of dominant sourdough LAB isolates and to evaluate their in vivo safety and in vitro antifungal properties for using as biopreservative agents. Sequencing results of PCR products led to identification of Lactobacillus reuteri and Pediococcus diacetilactis as LAB isolates. Antifungal activity of the isolates and their cell-free culture filtrate (CCF) were also confirmed against aflatoxigenic Aspergillus flavus, respectively by overlay and spore spot methods. Accordingly, antagonistic effect of P. diacetilactis and its CCF were significantly (P<0.05) higher than L. reuteri and CCF of mentioned LAB isolate. Clinical chemistry and haematological findings in mice fed LAB demonstrated also insignificant difference vs control mice and were in the normal range, which confirmed the safety of LAB isolates. By considering the importance of safe, food grade biocontrol agents, L. reuteri and P. diacetilactis isolates and their CCF may be considered as an alternative for antibiotics and other chemical preservatives in food and feed processing chain
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20
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El Sheikha AF, Hu DM. Molecular techniques reveal more secrets of fermented foods. Crit Rev Food Sci Nutr 2018; 60:11-32. [DOI: 10.1080/10408398.2018.1506906] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Aly Farag El Sheikha
- Jiangxi Agricultural University, Jiangxi Key Laboratory for Conservation and Utilization of Fungal Resources, Nanchang, China
- McMaster University, Department of Biology, Hamilton, Ontario, Canada
- Minufiya University, Faculty of Agriculture, Department of Food Science and Technology, Shibin El Kom, Minufiya Government, Egypt
| | - Dian-Ming Hu
- Jiangxi Agricultural University, Jiangxi Key Laboratory for Conservation and Utilization of Fungal Resources, Nanchang, China
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21
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Investigation on “spontaneous fermentation” and the productivity of microbial exopolysaccharides by Lactobacillus plantarum and Pediococcus pentosaceus isolated from wheat bran sourdough. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.05.071] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Harth H, Van Kerrebroeck S, De Vuyst L. Impact of process conditions on the microbial community dynamics and metabolite production kinetics of teff sourdough fermentations under bakery and laboratory conditions. Food Sci Nutr 2018; 6:1438-1455. [PMID: 30258586 PMCID: PMC6145266 DOI: 10.1002/fsn3.690] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 04/26/2018] [Accepted: 04/27/2018] [Indexed: 12/14/2022] Open
Abstract
Teff and teff sourdoughs are promising ingredients for bread production. Therefore, this study aimed at the characterization of spontaneous and flour-native starter culture-initiated teff sourdough productions under bakery and laboratory conditions. Backslopped laboratory and bakery teff sourdough productions were characterized by different lactic acid bacteria (LAB) and yeast species, but were both characterized by a pH below 4.0 after five backslopping steps. The sourdough-associated Lactobacillus sanfranciscensis was isolated for the first time from backslopped spontaneous teff sourdoughs. The autochthonous strain L. sanfranciscensis IMDO 150101 was tested as starter culture during laboratory teff sourdough fermentations. Its prevalence could be related to the process conditions applied, in particular the ambient temperature (below 30°C). Breads made with 20% teff sourdough (on flour basis) displayed interesting features compared with all-wheat-based reference breads. Teff sourdoughs were characterized as to their pH evolution, microbial community dynamics, and microbial species composition. Representative strains of the LAB species isolated from these sourdoughs, in particular L. sanfranciscensis, may be selected as starter cultures for the production of stable teff sourdoughs and flavorful breads, provided they are adapted to the environmental conditions applied.
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Affiliation(s)
- Henning Harth
- Research Group of Industrial Microbiology and Food BiotechnologyFaculty of Sciences and Bioengineering SciencesVrije Universiteit BrusselBrusselsBelgium
| | - Simon Van Kerrebroeck
- Research Group of Industrial Microbiology and Food BiotechnologyFaculty of Sciences and Bioengineering SciencesVrije Universiteit BrusselBrusselsBelgium
| | - Luc De Vuyst
- Research Group of Industrial Microbiology and Food BiotechnologyFaculty of Sciences and Bioengineering SciencesVrije Universiteit BrusselBrusselsBelgium
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23
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Musatti A, Mapelli C, Rollini M, Foschino R, Picozzi C. Can Zymomonas mobilis Substitute Saccharomyces cerevisiae in Cereal Dough Leavening? Foods 2018; 7:foods7040061. [PMID: 29659515 PMCID: PMC5920426 DOI: 10.3390/foods7040061] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 04/12/2018] [Accepted: 04/13/2018] [Indexed: 11/16/2022] Open
Abstract
Baker’s yeast intolerance is rising among Western populations, where Saccharomyces cerevisiae is spread in fermented food and food components. Zymomonas mobilis is a bacterium commonly used in tropical areas to produce alcoholic beverages, and it has only rarely been considered for dough leavening probably because it only ferments glucose, fructose and sucrose, which are scarcely present in flour. However, through alcoholic fermentation, similarly to S. cerevisiae, it provides an equimolar mixture of ethanol and CO₂ that can rise a dough. Here, we propose Z. mobilis as a new leavening agent, as an alternative to S. cerevisiae, overcoming its technological limit with different strategies: (1) adding glucose to the dough formulation; and (2) exploiting the maltose hydrolytic activity of Lactobacillus sanfranciscensis associated with Z. mobilis. CO₂ production, dough volume increase, pH value, microbial counts, sugars consumption and ethanol production were monitored. Results suggest that glucose addition to the dough lets Z. mobilis efficiently leaven a dough, while glucose released by L. sanfranciscensis is not so well fermented by Z. mobilis, probably due to the strong acidification. Nevertheless, the use of Z. mobilis as a leavening agent could contribute to increasing the variety of baked goods alternative to those leavened by S. cerevisiae.
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Affiliation(s)
- Alida Musatti
- Dipartimento di Scienze per gli Alimenti, la Nutrizione, l'Ambiente, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Chiara Mapelli
- Dipartimento di Scienze per gli Alimenti, la Nutrizione, l'Ambiente, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Manuela Rollini
- Dipartimento di Scienze per gli Alimenti, la Nutrizione, l'Ambiente, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Roberto Foschino
- Dipartimento di Scienze per gli Alimenti, la Nutrizione, l'Ambiente, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Claudia Picozzi
- Dipartimento di Scienze per gli Alimenti, la Nutrizione, l'Ambiente, Università degli Studi di Milano, 20133 Milan, Italy.
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Clément H, Prost C, Chiron H, Ducasse MB, Della Valle G, Courcoux P, Onno B. The effect of organic wheat flour by-products on sourdough performances assessed by a multi-criteria approach. Food Res Int 2018; 106:974-981. [PMID: 29580011 DOI: 10.1016/j.foodres.2018.01.053] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 12/08/2017] [Accepted: 01/21/2018] [Indexed: 11/17/2022]
Abstract
In this study, we determined the effect of organic (i) flour ash content (1%-1.4%) and (ii) flour by-product addition (bran, shorts and germ) on sourdough performances. After five consecutive back-sloppings, sourdough was used for bread-making and its bread-related properties were assessed. No effect of flour composition factors (i & ii) on sourdough lactic acid bacteria and yeasts were highlighted. Nonetheless, they greatly altered lactic acid and acetic acid sourdough contents from 6.9 to 17.4 g/kg and from 0.9 to 2.2 g/kg, respectively. The flour ash content (i) had a significant and positive effect on sourdough acidity and CO2 production. Bread made with sourdough with a high ash content had a significantly higher acidity and specific volume. These physicochemical differences between breads were perceived by sensory evaluation in a significant way. Sourdough supplemented (ii) with germ had higher lactic acid and carbon dioxide contents than sourdough supplemented with bran and shorts. Hence, flour composition, combining ash content and flour by-products, appears to be an effective factor to obtain a better control of sourdough performances.
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Affiliation(s)
- Héliciane Clément
- BIOFOURNIL, ZA La Camusière, 49600 Le Puiset Doré, France; Flavor team, Matrix and Food, Process/properties-Structure/sensory, UMR CNRS 6144 GEPEA, Oniris, LUNAM University, Nantes, France; INRA, UR 1268 Biopolymères, Interactions & Assemblages (BIA), Nantes, France; Food and Industrial Microbiology Laboratory, UMR CNRS 6144 GEPEA, Oniris, LUNAM University, Nantes, France
| | - Carole Prost
- Flavor team, Matrix and Food, Process/properties-Structure/sensory, UMR CNRS 6144 GEPEA, Oniris, LUNAM University, Nantes, France
| | - Hubert Chiron
- INRA, UR 1268 Biopolymères, Interactions & Assemblages (BIA), Nantes, France
| | | | - Guy Della Valle
- INRA, UR 1268 Biopolymères, Interactions & Assemblages (BIA), Nantes, France
| | - Philippe Courcoux
- USC "Sensometrics and Chemometrics Laboratory", Oniris, LUNAM University, Nantes F-44322, France
| | - Bernard Onno
- Food and Industrial Microbiology Laboratory, UMR CNRS 6144 GEPEA, Oniris, LUNAM University, Nantes, France.
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26
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Fujimoto A, Ito K, Itou M, Narushima N, Ito T, Yamamoto A, Hirayama S, Furukawa S, Morinaga Y, Miyamoto T. Microbial behavior and changes in food constituents during fermentation of Japanese sourdoughs with different rye and wheat starting materials. J Biosci Bioeng 2018; 125:97-104. [DOI: 10.1016/j.jbiosc.2017.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 08/15/2017] [Accepted: 08/17/2017] [Indexed: 11/28/2022]
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27
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Sourdoughs as a function of their species diversity and process conditions, a meta-analysis. Trends Food Sci Technol 2017. [DOI: 10.1016/j.tifs.2017.08.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Coda R, Kianjam M, Pontonio E, Verni M, Di Cagno R, Katina K, Rizzello CG, Gobbetti M. Sourdough-type propagation of faba bean flour: Dynamics of microbial consortia and biochemical implications. Int J Food Microbiol 2017; 248:10-21. [PMID: 28242419 DOI: 10.1016/j.ijfoodmicro.2017.02.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 12/28/2016] [Accepted: 02/18/2017] [Indexed: 10/20/2022]
Abstract
The microbial ecology of faba bean sourdoughs obtained from an Italian (Ita) and a Finnish (Fi) cultivar, belonging respectively to Vicia faba major and V. faba minor groups, was described by 16S rRNA gene pyrosequencing and culture-dependent analysis. The sourdoughs were propagated with traditional backslopping procedure throughout 14days. Higher microbial diversity was found in the sourdough deriving from V. faba minor (Fi), still containing residual hulls after the milling procedure. After 2days of propagation, the microbial profile of Ita sourdough was characterized by the dominance of the genera Pediococcus, Leuconostoc and Weissella, while the genera Lactococcus, Lactobacillus and Escherichia, as well as Enterobacteriaceae were present in Fi sourdoughs. Yeasts were in very low cell density until the second backslopping and were not anymore found after this time by plate count or pyrosequencing analysis. Among the lactic acid bacteria isolates, Pediococcus pentosaceus, Leuconostoc mesenteroides and Weissella koreensis had the highest frequency of occurrence in both the sourdoughs. Lactobacillus sakei was the only lactobacillus isolated from the first to the last propagation day in Fi sourdough. According to microbiological and acidification properties, the maturity of the sourdoughs was reached after 5days. The presence of hulls and the different microbial composition reflected on biochemical characteristics of Fi sourdoughs, including acidification and phenolic compounds. Moreover, proteolysis in Fi sourdough was more intense compared to Ita. The microbial dynamic of the faba bean sourdoughs showed some differences with the most studied cereal sourdoughs.
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Affiliation(s)
- Rossana Coda
- University of Helsinki, Department of Food and Environmental Sciences, Agnes Sjioberginkatu 2, Helsinki, Finland
| | - Maryam Kianjam
- University of Helsinki, Department of Food and Environmental Sciences, Agnes Sjioberginkatu 2, Helsinki, Finland
| | - Erica Pontonio
- University of Bari "Aldo Moro", Department of Soil, Plant, and Food Science, Via Amendola 165/a, 70125 Bari, Italy
| | - Michela Verni
- University of Bari "Aldo Moro", Department of Soil, Plant, and Food Science, Via Amendola 165/a, 70125 Bari, Italy
| | - Raffaella Di Cagno
- Faculty of Food Science and Technology, University of Bozen, 39100 Bolzano, Italy
| | - Kati Katina
- University of Helsinki, Department of Food and Environmental Sciences, Agnes Sjioberginkatu 2, Helsinki, Finland
| | - Carlo Giuseppe Rizzello
- University of Bari "Aldo Moro", Department of Soil, Plant, and Food Science, Via Amendola 165/a, 70125 Bari, Italy.
| | - Marco Gobbetti
- Faculty of Food Science and Technology, University of Bozen, 39100 Bolzano, Italy
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Microbial Ecology and Process Technology of Sourdough Fermentation. ADVANCES IN APPLIED MICROBIOLOGY 2017; 100:49-160. [PMID: 28732554 DOI: 10.1016/bs.aambs.2017.02.003] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From a microbiological perspective, sourdough is to be considered as a specific and stressful ecosystem, harboring yeasts and lactic acid bacteria (LAB), that is used for the production of baked goods. With respect to the metabolic impact of the sourdough microbiota, acidification (LAB), flavor formation (LAB and yeasts), and leavening (yeasts and heterofermentative LAB species) are most noticeable. Three distinct types of sourdough fermentation processes can be discerned based on the inocula applied, namely backslopped ones (type 1), those initiated with starter cultures (type 2), and those initiated with a starter culture followed by backslopping (type 3). A sourdough-characteristic LAB species is Lactobacillus sanfranciscensis. A sourdough-characteristic yeast species is Candida humilis. Although it has been suggested that the microbiota of a specific sourdough may be influenced by its geographical origin, region specificity often seems to be an artefact resulting from interpretation of the research data, as those are dependent on sampling, isolation, and identification procedures. It is however clear that sourdough-adapted microorganisms are able to withstand stress conditions encountered during their growth. Based on the technological setup, type 0 (predoughs), type I (artisan bakery firm sourdoughs), type II (industrial liquid sourdoughs), and type III sourdoughs (industrial dried sourdoughs) can be distinguished. The production of all sourdoughs, independent of their classification, depends on several intrinsic and extrinsic factors. Both the flour (type, quality status, etc.) and the process parameters (fermentation temperature, pH and pH evolution, dough yield, water activity, oxygen tension, backslopping procedure and fermentation duration, etc.) determine the dynamics and outcome of (backslopped) sourdough fermentation processes.
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Van Kerrebroeck S, Bastos FCC, Harth H, De Vuyst L. A low pH does not determine the community dynamics of spontaneously developed backslopped liquid wheat sourdoughs but does influence their metabolite kinetics. Int J Food Microbiol 2016; 239:54-64. [DOI: 10.1016/j.ijfoodmicro.2016.07.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 06/09/2016] [Accepted: 07/11/2016] [Indexed: 11/24/2022]
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Yeast diversity of sourdoughs and associated metabolic properties and functionalities. Int J Food Microbiol 2016; 239:26-34. [DOI: 10.1016/j.ijfoodmicro.2016.07.018] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 06/09/2016] [Accepted: 07/11/2016] [Indexed: 12/30/2022]
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Gobbetti M, Minervini F, Pontonio E, Di Cagno R, De Angelis M. Drivers for the establishment and composition of the sourdough lactic acid bacteria biota. Int J Food Microbiol 2016; 239:3-18. [DOI: 10.1016/j.ijfoodmicro.2016.05.022] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 05/11/2016] [Accepted: 05/20/2016] [Indexed: 10/21/2022]
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Picozzi C, Mariotti M, Cappa C, Tedesco B, Vigentini I, Foschino R, Lucisano M. Development of a Type I gluten-free sourdough. Lett Appl Microbiol 2016; 62:119-25. [PMID: 26581944 DOI: 10.1111/lam.12525] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 10/30/2015] [Accepted: 11/04/2015] [Indexed: 12/26/2022]
Abstract
UNLABELLED The aim of this study was the setting up of a gluten-free sourdough from selected lactobacilli and yeasts isolated from a traditional wheat-based Type I sourdough. A gluten-free matrix was inoculated with Lactobacillus sanfranciscensis and Candida humilis, fermented to pH 4·0, and constantly propagated for ten times. A stable association between micro-organisms was observed from the second refreshment with mean values of 9·08 ± 0·25 log CFU g(-1) for lactobacilli and 7·81 ± 0·07 log CFU g(-1) for yeasts. In order to have a good workability of the dough, a 230 BU consistency was considered. Rheofermentographic indices remained constant over the ten refreshments, showing an average value of 23·2 mm dough height in about 7·5 h. The CO2 production and retention volumes reached average values of 1430 and 1238 ml respectively. The microbiological and technological data obtained highlighted that a GF sourdough was effectively developed. SIGNIFICANCE AND IMPACT OF THE STUDY Type I sourdough has a long tradition as a leavening agent of baked goods as its use results in an improved texture, flavour, taste and extended shelf-life of the final products. In this study a Type I gluten-free sourdough was obtained. After few refreshments in controlled conditions, the sourdough presented a stable association between Lactobacillus sanfranciscensis and Candida humilis, constant fermentation times and technological properties (in terms of dough consistency, dough maximum height, CO2 production and retention). The results showed that the gluten-free sourdough developed in this study can improve the overall quality of gluten-free baked products.
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Affiliation(s)
- C Picozzi
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - M Mariotti
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - C Cappa
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - B Tedesco
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - I Vigentini
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - R Foschino
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
| | - M Lucisano
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, Milan, Italy
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Community dynamics and metabolite target analysis of spontaneous, backslopped barley sourdough fermentations under laboratory and bakery conditions. Int J Food Microbiol 2016; 228:22-32. [DOI: 10.1016/j.ijfoodmicro.2016.04.011] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/31/2016] [Accepted: 04/04/2016] [Indexed: 11/19/2022]
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Del Mónaco SM, Rodríguez ME, Lopes CA. Pichia kudriavzevii as a representative yeast of North Patagonian winemaking terroir. Int J Food Microbiol 2016; 230:31-9. [PMID: 27124468 DOI: 10.1016/j.ijfoodmicro.2016.04.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 04/06/2016] [Accepted: 04/12/2016] [Indexed: 11/30/2022]
Abstract
Terroir concept includes specific soil, topography, climate, landscape characteristics and biodiversity features. In reference to the last aspect, recent studies investigating the microbial biogeography (lately called 'microbial terroir') have revealed that different wine-growing regions maintain different microbial communities. The aim of the present work was to identify potential autochthonous fermentative yeasts isolated from native plants in North Patagonia, Schinus johnstonii, Ephedra ochreata and Lycium chilense, that could be associated to the specific vitivinicultural terroir of this region. Different Pichia kudriavzevii isolates were recovered from these plants and physiologically and genetically compared to regional wine isolates and foreign reference strains of the same species. All isolates were subjected to molecular characterization including mtDNA-RFLP, RAPD-PCR and sequence analysis. Both wine and native P. kudriavzevii isolates from Patagonia showed similar features, different from those showed by foreign strains, suggesting that this species could be part of a specific regional terroir from North Patagonia.
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Affiliation(s)
- Silvana M Del Mónaco
- Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas (PROBIEN, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina - Universidad Nacional del Comahue), Buenos Aires, Neuquén, Argentina; Facultad de Ciencias Médicas, Universidad Nacional del Comahue, Argentina
| | - María E Rodríguez
- Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas (PROBIEN, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina - Universidad Nacional del Comahue), Buenos Aires, Neuquén, Argentina; Facultad de Ciencias Médicas, Universidad Nacional del Comahue, Argentina.
| | - Christian A Lopes
- Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas (PROBIEN, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina - Universidad Nacional del Comahue), Buenos Aires, Neuquén, Argentina; Facultad de Ciencias Médicas, Universidad Nacional del Comahue, Argentina
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Ruiz Rodríguez L, Vera Pingitore E, Rollan G, Cocconcelli PS, Fontana C, Saavedra L, Vignolo G, Hebert EM. Biodiversity and technological-functional potential of lactic acid bacteria isolated from spontaneously fermented quinoa sourdoughs. J Appl Microbiol 2016; 120:1289-301. [DOI: 10.1111/jam.13104] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 02/01/2016] [Accepted: 02/16/2016] [Indexed: 11/30/2022]
Affiliation(s)
- L. Ruiz Rodríguez
- Centro de Referencia para Lactobacilos (CERELA-CONICET); S. M. de Tucumán Tucumán Argentina
| | - E. Vera Pingitore
- Instituto Superior de Investigaciones Biológicas (INSIBIO); CONICET-UNT; Tucumán Argentina
| | - G. Rollan
- Centro de Referencia para Lactobacilos (CERELA-CONICET); S. M. de Tucumán Tucumán Argentina
| | - P. S. Cocconcelli
- Istituto di Microbiologia-Centro Ricerche Biotecnologiche; Università Cattolica del Sacro Cuore; Piacenza-Cremona Italy
| | - C. Fontana
- Istituto di Microbiologia-Centro Ricerche Biotecnologiche; Università Cattolica del Sacro Cuore; Piacenza-Cremona Italy
| | - L. Saavedra
- Centro de Referencia para Lactobacilos (CERELA-CONICET); S. M. de Tucumán Tucumán Argentina
| | - G. Vignolo
- Centro de Referencia para Lactobacilos (CERELA-CONICET); S. M. de Tucumán Tucumán Argentina
| | - E. M. Hebert
- Centro de Referencia para Lactobacilos (CERELA-CONICET); S. M. de Tucumán Tucumán Argentina
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Lhomme E, Urien C, Legrand J, Dousset X, Onno B, Sicard D. Sourdough microbial community dynamics: An analysis during French organic bread-making processes. Food Microbiol 2016; 53:41-50. [DOI: 10.1016/j.fm.2014.11.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/20/2014] [Accepted: 11/28/2014] [Indexed: 10/24/2022]
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38
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Lactic acid bacterium and yeast microbiotas of sixteen French traditional sourdoughs. Int J Food Microbiol 2015; 215:161-70. [DOI: 10.1016/j.ijfoodmicro.2015.09.015] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 09/11/2015] [Accepted: 09/22/2015] [Indexed: 11/21/2022]
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House microbiotas as sources of lactic acid bacteria and yeasts in traditional Italian sourdoughs. Food Microbiol 2015; 52:66-76. [DOI: 10.1016/j.fm.2015.06.009] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 06/06/2015] [Accepted: 06/27/2015] [Indexed: 12/26/2022]
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40
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Candida milleri species reveals intraspecific genetic and metabolic polymorphisms. Food Microbiol 2014; 42:72-81. [DOI: 10.1016/j.fm.2014.02.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 01/17/2014] [Accepted: 02/15/2014] [Indexed: 11/20/2022]
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41
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Diversity of the lactic acid bacterium and yeast microbiota in the switch from firm- to liquid-sourdough fermentation. Appl Environ Microbiol 2014; 80:3161-72. [PMID: 24632249 DOI: 10.1128/aem.00309-14] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Four traditional type I sourdoughs were comparatively propagated (28 days) under firm (dough yield, 160) and liquid (dough yield, 280) conditions to mimic the alternative technology options frequently used for making baked goods. After 28 days of propagation, liquid sourdoughs had the lowest pH and total titratable acidity (TTA), the lowest concentrations of lactic and acetic acids and free amino acids, and the most stable density of presumptive lactic acid bacteria. The cell density of yeasts was the highest in liquid sourdoughs. Liquid sourdoughs showed simplified microbial diversity and harbored a low number of strains, which were persistent. Lactobacillus plantarum dominated firm sourdoughs over time. Leuconostoc lactis and Lactobacillus brevis dominated only some firm sourdoughs, and Lactobacillus sanfranciscensis persisted for some time only in some firm sourdoughs. Leuconostoc citreum persisted in all firm and liquid sourdoughs, and it was the only species detected in liquid sourdoughs at all times; it was flanked by Leuconostoc mesenteroides in some sourdoughs. Saccharomyces cerevisiae, Candida humilis, Saccharomyces servazzii, Saccharomyces bayanus-Kazachstania sp., and Torulaspora delbrueckii were variously identified in firm and liquid sourdoughs. A total of 197 volatile components were identified through purge and trap-/solid-phase microextraction-gas chromatography-mass spectrometry (PT-/SPME-GC-MS). Aldehydes, several alcohols, and some esters were at the highest levels in liquid sourdoughs. Firm sourdoughs mainly contained ethyl acetate, acetic acid, some sulfur compounds, and terpenes. The use of liquid fermentation would change the main microbial and biochemical features of traditional baked goods, which have been manufactured under firm conditions for a long time.
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Minervini F, De Angelis M, Di Cagno R, Gobbetti M. Ecological parameters influencing microbial diversity and stability of traditional sourdough. Int J Food Microbiol 2014; 171:136-46. [DOI: 10.1016/j.ijfoodmicro.2013.11.021] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 11/20/2013] [Accepted: 11/22/2013] [Indexed: 11/30/2022]
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The carbohydrate metabolism signature of lactococcus lactis strain A12 reveals its sourdough ecosystem origin. Appl Environ Microbiol 2013; 79:5844-52. [PMID: 23872564 DOI: 10.1128/aem.01560-13] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Lactococcus lactis subsp. lactis strain A12 was isolated from sourdough. Combined genomic, transcriptomic, and phenotypic analyses were performed to understand its survival capacity in the complex sourdough ecosystem and its role in the microbial community. The genome sequence comparison of strain A12 with strain IL1403 (a derivative of an industrial dairy strain) revealed 78 strain-specific regions representing 23% of the total genome size. Most of the strain-specific genes were involved in carbohydrate metabolism and are potentially required for its persistence in sourdough. Phenotype microarray, growth tests, and analysis of glycoside hydrolase content showed that strain A12 fermented plant-derived carbohydrates, such as arabinose and α-galactosides. Strain A12 exhibited specific growth rates on raffinose that were as high as they were on glucose and was able to release sucrose and galactose outside the cell, providing soluble carbohydrates for sourdough microflora. Transcriptomic analysis identified genes specifically induced during growth on raffinose and arabinose and reveals an alternative pathway for raffinose assimilation to that used by other lactococci.
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44
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Microbial ecology of sourdough fermentations: diverse or uniform? Food Microbiol 2013; 37:11-29. [PMID: 24230469 DOI: 10.1016/j.fm.2013.06.002] [Citation(s) in RCA: 257] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 05/14/2013] [Accepted: 06/03/2013] [Indexed: 01/16/2023]
Abstract
Sourdough is a specific and stressful ecosystem inhabited by yeasts and lactic acid bacteria (LAB), mainly heterofermentative lactobacilli. On the basis of their inocula, three types of sourdough fermentation processes can be distinguished, namely backslopped ones, those initiated with starter cultures, and those initiated with a starter culture followed by backslopping. Typical sourdough LAB species are Lactobacillus fermentum, Lactobacillus paralimentarius, Lactobacillus plantarum, and Lactobacillus sanfranciscensis. Typical sourdough yeast species are Candida humilis, Kazachstania exigua, and Saccharomyces cerevisiae. Whereas region specificity is claimed in the case of artisan backslopped sourdoughs, no clear-cut relationship between a typical sourdough and its associated microbiota can be found, as this is dependent on the sampling, isolation, and identification procedures. Both simple and very complex consortia may occur. Moreover, a series of intrinsic and extrinsic factors may influence the composition of the sourdough microbiota. For instance, an influence of the flour (type, quality status, etc.) and the process parameters (temperature, pH, dough yield, backslopping practices, etc.) occurs. In this way, the presence of Lb. sanfranciscensis during sourdough fermentation depends on specific environmental and technological factors. Also, Triticum durum seems to select for obligately heterofermentative LAB species. Finally, there are indications that the sourdough LAB are of intestinal origin.
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Beckmann M, Lloyd AJ, Haldar S, Seal C, Brandt K, Draper J. Hydroxylated phenylacetamides derived from bioactive benzoxazinoids are bioavailable in humans after habitual consumption of whole grain sourdough rye bread. Mol Nutr Food Res 2013; 57:1859-73. [PMID: 23681766 DOI: 10.1002/mnfr.201200777] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 03/13/2013] [Accepted: 03/14/2013] [Indexed: 01/02/2023]
Abstract
SCOPE Understanding relationships between dietary whole grain and health is hindered by incomplete knowledge of potentially bioactive metabolites derived from these foods. We aimed to discover compounds in urine correlated with changes in amounts of whole grain rye consumption. METHODS AND RESULTS After a wash-out period, volunteers consumed 48-g whole grain rye foods per day for 4 wk and then doubled their intake for a further 4 wk. Samples of 24-h urines were analyzed by flow infusion electrospray MS followed by supervised multivariate data analysis. Urine samples from participants who reported high intakes of rye flakes, rye pasta, or total whole grain rye products could not be discriminated adequately from their wash-out samples. However, discrimination was seen in urine samples from participants who reported high whole grain sourdough rye bread consumption. Accurate mass analysis of explanatory signals followed by fragmentation identified conjugates of the benzoxazinoid lactam 2-hydroxy-1,4-benzoxazin-3-one and hydroxylated phenyl acetamide derivatives. Statistical validation showed sensitivities of 84-96% and specificities of 70-81% (p values < 0·05) for elevated concentrations of these signals after preferential whole grain sourdough rye bread consumption. CONCLUSION Several potentially bioactive alkaloids have been identified in humans consuming fermented whole grain sourdough rye bread.
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Affiliation(s)
- Manfred Beckmann
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, UK
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46
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Quan Y, Han H, Zheng S. Effect of dissolved oxygen concentration (microaerobic and aerobic) on selective enrichment culture for bioaugmentation of acidic industrial wastewater. BIORESOURCE TECHNOLOGY 2012; 120:1-5. [PMID: 22776258 DOI: 10.1016/j.biortech.2012.06.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 06/09/2012] [Accepted: 06/11/2012] [Indexed: 06/01/2023]
Abstract
The successful application of bioaugmentation is largely dependent on the selective enrichment of culture with regards to pH, temperature, salt, or specific toxic organic pollutants. In this study, we investigated the effect of dissolved oxygen (DO) concentrations (aerobic, >2 mg L(-1); microaerobic, <1 mg L(-1)) on yeast enrichment culture for bioaugmentation of acidic industrial wastewater (pH 3.9-4.7). Clone library analyses revealed that the yeast community shifted in response to different DO levels, and that Candida humilis and Candida pseudolambica were individually dominant in the aerobic and microaerobic enrichment cultures. This would significantly influence the isolation results, and further hinder bioaugmentation due to differences in DO environments during the enrichment and application periods. However, differences in the selective enrichment culture cannot be predicted based on differences in pollutant removal performance. Thus, DO concentrations (aerobic/microaerobic) should be considered a secondary selective pressure to achieve successful bioaugmentation.
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Affiliation(s)
- Ying Quan
- MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
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47
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Influence of artisan bakery- or laboratory-propagated sourdoughs on the diversity of lactic acid bacterium and yeast microbiotas. Appl Environ Microbiol 2012; 78:5328-40. [PMID: 22635989 DOI: 10.1128/aem.00572-12] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Seven mature type I sourdoughs were comparatively back-slopped (80 days) at artisan bakery and laboratory levels under constant technology parameters. The cell density of presumptive lactic acid bacteria and related biochemical features were not affected by the environment of propagation. On the contrary, the number of yeasts markedly decreased from artisan bakery to laboratory propagation. During late laboratory propagation, denaturing gradient gel electrophoresis (DGGE) showed that the DNA band corresponding to Saccharomyces cerevisiae was no longer detectable in several sourdoughs. Twelve species of lactic acid bacteria were variously identified through a culture-dependent approach. All sourdoughs harbored a certain number of species and strains, which were dominant throughout time and, in several cases, varied depending on the environment of propagation. As shown by statistical permutation analysis, the lactic acid bacterium populations differed among sourdoughs propagated at artisan bakery and laboratory levels. Lactobacillus plantarum, Lactobacillus sakei, and Weissella cibaria dominated in only some sourdoughs back-slopped at artisan bakeries, and Leuconostoc citreum seemed to be more persistent under laboratory conditions. Strains of Lactobacillus sanfranciscensis were indifferently found in some sourdoughs. Together with the other stable species and strains, other lactic acid bacteria temporarily contaminated the sourdoughs and largely differed between artisan bakery and laboratory levels. The environment of propagation has an undoubted influence on the composition of sourdough yeast and lactic acid bacterium microbiotas.
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48
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Venturi M, Guerrini S, Vincenzini M. Stable and non-competitive association of Saccharomyces cerevisiae, Candida milleri and Lactobacillus sanfranciscensis during manufacture of two traditional sourdough baked goods. Food Microbiol 2012; 31:107-15. [PMID: 22475948 DOI: 10.1016/j.fm.2012.02.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 02/09/2012] [Accepted: 02/18/2012] [Indexed: 11/18/2022]
Abstract
The microbiota occurring in all the manufacturing phases of two Italian sourdough sweet-leavened baked goods (a typical Genoese dry biscuit, Lagaccio, and a soft stuffed North Italian typical cake, Panettone) were investigated over a period of three years. The two sourdough mother sponges were characterized by the stable presence of three dominant microbial species in potential competition for carbohydrates: Lactobacillus sanfranciscensis, Candida milleri, and Saccharomyces cerevisiae. Genotypic and phenotypic characterizations of microbial isolates pointed out that each mother sponge harbored its own strains, well distinguishable by molecular methods of analysis but not differing in their main metabolic properties from those known for the corresponding species. The microbial and biochemical evolution during the whole production protocol of both manufactures demonstrated that the three microbial species grew at almost the same growth rates, without exhausting any of the main carbon substrates (maltose, glucose and fructose). The quite similar growth dynamics under practical conditions and the constant presence of all fermentable carbohydrates were recognized as responsible for the stable non competitive association of maltose-positive and maltose-negative species in both sourdoughs. However, the two sourdoughs were characterized by quite different LAB to yeast ratio, with values significantly higher in Panettone than in Lagaccio. The cause of this difference could mainly be ascribed to the temperature of the mother sponge regeneration phase, that, in the case of Panettone manufacture, occurred under conditions of moderate refrigeration.
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Affiliation(s)
- Manuel Venturi
- Dipartimento di Biotecnologie Agrarie, Università degli Studi di Firenze, P.le delle Cascine 24, 50144 Firenze, Italy
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Lactic acid bacterium and yeast microbiotas of 19 sourdoughs used for traditional/typical italian breads: interactions between ingredients and microbial species diversity. Appl Environ Microbiol 2011; 78:1251-64. [PMID: 22156414 DOI: 10.1128/aem.07721-11] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The study of the microbiotas of 19 Italian sourdoughs used for the manufacture of traditional/typical breads allowed the identification, through a culture-dependent approach, of 20 and 4 species of lactic acid bacteria (LAB) and yeasts, respectively. Numerically, the most frequent LAB isolates were Lactobacillus sanfranciscensis (ca. 28% of the total LAB isolates), Lactobacillus plantarum (ca. 16%), and Lactobacillus paralimentarius (ca. 14%). Saccharomyces cerevisiae was identified in 16 sourdoughs. Candida humilis, Kazachstania barnettii, and Kazachstania exigua were also identified. As shown by principal component analysis (PCA), a correlation was found between the ingredients, especially the type of flour, the microbial community, and the biochemical features of sourdoughs. Triticum durum flours were characterized by the high level of maltose, glucose, fructose, and free amino acids (FAA) correlated with the sole or main presence of obligately heterofermentative LAB, the lowest number of facultatively heterofermentative strains, and the low cell density of yeasts in the mature sourdoughs. This study highlighted, through a comprehensive and comparative approach, the dominant microbiotas of 19 Italian sourdoughs, which determined some of the peculiarities of the resulting traditional/typical Italian breads.
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50
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Su MS, Schlicht S, Gänzle MG. Contribution of glutamate decarboxylase in Lactobacillus reuteri to acid resistance and persistence in sourdough fermentation. Microb Cell Fact 2011; 10 Suppl 1:S8. [PMID: 21995488 PMCID: PMC3231934 DOI: 10.1186/1475-2859-10-s1-s8] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Background Acid stress impacts the persistence of lactobacilli in industrial sourdough fermentations, and in intestinal ecosystems. However, the contribution of glutamate to acid resistance in lactobacilli has not been demonstrated experimentally, and evidence for the contribution of acid resistance to the competitiveness of lactobacilli in sourdough is lacking. It was therefore the aim of this study to investigate the ecological role of glutamate decarboxylase in L. reuteri. Results A gene coding for a putative glutamate decarboxylase, gadB, was identified in the genome of L. reuteri 100-23. Different from the organization of genetic loci coding for glutamate decarboxylase in other lactic acid bacteria, gadB was located adjacent to a putative glutaminase gene, gls3. An isogenic deletion mutant, L. reuteri ∆gadB, was generated by a double crossover method. L. reuteri 100-23 but not L. reuteri ∆gadB converted glutamate to γ-aminobutyrate (GABA) in phosphate butter (pH 2.5). In sourdough, both strains converted glutamine to glutamate but only L. reuteri 100-23 accumulated GABA. Glutamate addition to phosphate buffer, pH 2.5, improved survival of L. reuteri 100-23 100-fold. However, survival of L. reuteri ∆gadB remained essentially unchanged. The disruption of gadB did not affect growth of L. reuteri in mMRS or in sourdough. However, the wild type strain L. reuteri 100-23 displaced L. reuteri ∆gadB after 5 cycles of fermentation in back-slopped sourdough fermentations. Conclusions The conversion of glutamate to GABA by L. reuteri 100-23 contributes to acid resistance and to competitiveness in industrial sourdough fermentations. The organization of the gene cluster for glutamate conversion, and the availability of amino acids in cereals imply that glutamine rather than glutamate functions as the substrate for GABA formation. The exceptional coupling of glutamine deamidation to glutamate decarboxylation in L. reuteri likely reflects adaptation to cereal substrates.
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Affiliation(s)
- Marcia S Su
- University of Alberta, Department of Agricultural, Food and Nutritional Science, Edmonton, Canada
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