201
|
Guo J, Ni BJ, Han X, Chen X, Bond P, Peng Y, Yuan Z. Unraveling microbial structure and diversity of activated sludge in a full-scale simultaneous nitrogen and phosphorus removal plant using metagenomic sequencing. Enzyme Microb Technol 2017; 102:16-25. [DOI: 10.1016/j.enzmictec.2017.03.009] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 03/19/2017] [Accepted: 03/20/2017] [Indexed: 12/25/2022]
|
202
|
Chen G, Chen C, Lei Z. Meta-omics insights in the microbial community profiling and functional characterization of fermented foods. Trends Food Sci Technol 2017. [DOI: 10.1016/j.tifs.2017.05.002] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
203
|
Liu R, Kim AH, Kwak MK, Kang SO. Proline-Based Cyclic Dipeptides from Korean Fermented Vegetable Kimchi and from Leuconostoc mesenteroides LBP-K06 Have Activities against Multidrug-Resistant Bacteria. Front Microbiol 2017; 8:761. [PMID: 28512456 PMCID: PMC5411444 DOI: 10.3389/fmicb.2017.00761] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 04/12/2017] [Indexed: 11/13/2022] Open
Abstract
Lactobacillus plantarum and Leuconostoc mesenteroides play a prominent role as functional starters and predominant isolates in the production of various types of antimicrobial compound-containing fermented foods, especially including kimchi. In the case of the bioactive cyclic dipeptides, their racemic diastereomers inhibitory to bacteria and fungi have been suggested to come solely from Lactobacillus spp. of these strains. We previously demonstrated the antifungal and antiviral activities of proline-based cyclic dipeptides, which were fractionated from culture filtrates of Lb. plantarum LBP-K10 originated from kimchi. However, cyclic dipeptides have not been identified in the filtrates, either from cultures or fermented subject matter, driven by Ln. mesenteroides, which have been widely used as starter cultures for kimchi fermentation. Most importantly, the experimental verification of cyclic dipeptide-content changes during kimchi fermentation have also not been elucidated. Herein, the antibacterial fractions, including cyclo(Leu-Pro) and cyclo(Phe-Pro), from Ln. mesenteroides LBP-K06 culture filtrates, which exhibited a typical chromatographic retention behavior (tR), were identified by using semi-preparative high-performance liquid chromatography and gas chromatography-mass spectrometry. Based on this finding, the proline-based cyclic dipeptides, including cyclo(Ser-Pro), cyclo(Tyr-Pro), and cyclo(Leu-Pro), were additionally identified in the filtrates only when fermenting Chinese cabbage produced with Ln. mesenteroides LBP-K06 starter cultures. The detection and isolation of cyclic dipeptides solely in controlled fermented cabbage were conducted under the control of fermentation-process parameters concomitantly with strong CDP selectivity by using a two-consecutive-purification strategy. Interestingly, cyclic dipeptides in the filtrates, when using this strain as a starter, increased with fermentation time. However, no cyclic dipeptides were observed in the filtrates of other fermented products, including other types of kimchi and fermented materials of plant and animal origin. This is the first report to conclusively demonstrate evidence for the existence of antimicrobial cyclic dipeptides produced by Ln. mesenteroides in kimchi. Through filtrates from lactic acid bacterial cultures and from fermented foods, we have also proved a method of combining chromatographic fractionation and mass spectrometry-based analysis for screening cyclic dipeptide profiling, which may allow evaluation of the fermented dairy foods from a new perspective.
Collapse
Affiliation(s)
- Rui Liu
- Laboratory of Biophysics, School of Biological Sciences, and Institute of Microbiology, Seoul National UniversitySeoul, South Korea
| | - Andrew H Kim
- Laboratory of Biophysics, School of Biological Sciences, and Institute of Microbiology, Seoul National UniversitySeoul, South Korea
| | - Min-Kyu Kwak
- Laboratory of Biophysics, School of Biological Sciences, and Institute of Microbiology, Seoul National UniversitySeoul, South Korea
| | - Sa-Ouk Kang
- Laboratory of Biophysics, School of Biological Sciences, and Institute of Microbiology, Seoul National UniversitySeoul, South Korea
| |
Collapse
|
204
|
Kim DW, Kim BM, Lee HJ, Jang GJ, Song SH, Lee JI, Lee SB, Shim JM, Lee KW, Kim JH, Ham KS, Chen F, Kim HJ. Effects of Different Salt Treatments on the Fermentation Metabolites and Bacterial Profiles of Kimchi. J Food Sci 2017; 82:1124-1131. [DOI: 10.1111/1750-3841.13713] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 03/08/2017] [Accepted: 03/18/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Dong Wook Kim
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Bo-Min Kim
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Hyeon-Jeong Lee
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Gwang-Ju Jang
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Seong Hwa Song
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Jae-In Lee
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Sang Bong Lee
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Jae Min Shim
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Kang Wook Lee
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Jeong Hwan Kim
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
- Dept. of Food Science& Technology, and Inst. of Agriculture and Life Science; Gyeongsang Nat. Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| | - Kyung-Sik Ham
- Dept. of Food Engineering and Solar Salt Biotechnology Research Center; Jeonnam 534-729 Korea
| | - Feng Chen
- Dept. of Food, Nutrition, and Packaging Sciences; Clemson Univ.; SC 29634 USA
| | - Hyun-Jin Kim
- Div. of Applied Life Sciences (BK21 plus); Gyeongsang National Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
- Dept. of Food Science& Technology, and Inst. of Agriculture and Life Science; Gyeongsang Nat. Univ.; 501 Jinjudaero Jinju Gyeongsang Republic of Korea
| |
Collapse
|
205
|
Zhao N, Cai J, Zhang C, Guo Z, Lu W, Yang B, Tian FW, Liu XM, Zhang H, Chen W. Suitability of various DNA extraction methods for a traditional Chinese paocai system. Bioengineered 2017; 8:642-650. [PMID: 28409998 DOI: 10.1080/21655979.2017.1300736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Traditional paocai brine (PB), which is continuously propagated by back-slopping and contains various species of lactic acid bacteria (LAB), is critical for the flavor of paocai. Culture-independent approaches are commonly used to investigate the microbial communities of fermented food. To evaluate the influence of different DNA (DNA) extraction methods on estimates of bacterial community profiles from 4 PBs, the lysis efficiency, DNA yield, purity and denaturing gradient gel electrophoresis (DGGE) profiles of V3 region of a 16S ribosomal ribonucleic acid gene were acquired. The cell lysis pattern of SDS + beads and Lysing matrix E+ beads (methods 3 and 4) showed higher cell lysis efficiency than SDS and SDS + Lysozyme (methods 1 and 2) in all PBs. SDS + beads obtained the largest DNA yield of the 4 methods. Moreover, methods 3 and 4 resulted in higher H' values and generated more global bacteria profiles than other methods. Overall, our results demonstrate that the properties of PB significantly affect the efficiency of DNA extraction methods. Methods 3 and 4 were both suitable for DNA extraction from PB. Method 3 is more economic, simple and rapid than method 4 for large-scale studies of the bacterial profiles of PB.
Collapse
Affiliation(s)
- Nan Zhao
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China
| | - Jialiang Cai
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China
| | - Chuchu Zhang
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China
| | - Zhuang Guo
- d Northwest Hubei Research Institute of Traditional Fermented Food, College of Chemical Engineering and Food Science, Hu Bei University of Arts and Science , Xiangyang , China
| | - Wenwei Lu
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| | - Bo Yang
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| | - Feng-Wei Tian
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| | - Xiao-Ming Liu
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| | - Hao Zhang
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| | - Wei Chen
- a State Key Laboratory of Food Science and Technology, School of Food Science and Technology , Jiangnan University , Wuxi , P.R. China.,b Beijing Innovation Centre of Food Nutrition and Human Health , Beijing Technology & Business University , Beijing , P.R. China.,c International Joint Research Laboratory for Probiotics at Jiangnan University
| |
Collapse
|
206
|
Hwang J, Jang HJ, Kim J, Park C, Kim Y, Lim CH, Lee S, Rho MC. Lactococcus lactis
KR-050L inhibit IL-6/STAT3 activation. J Appl Microbiol 2017; 122:1412-1422. [DOI: 10.1111/jam.13444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 01/05/2017] [Accepted: 02/13/2017] [Indexed: 01/14/2023]
Affiliation(s)
- J.T. Hwang
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
- College of Agriculture and Life Sciences; Chungnam National University; 99 Daehak-ro Yuseong-gu Daejeon Korea
| | - H.-J. Jang
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| | - J.H. Kim
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| | - C.S. Park
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| | - Y. Kim
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| | - C.-H. Lim
- College of Agriculture and Life Sciences; Chungnam National University; 99 Daehak-ro Yuseong-gu Daejeon Korea
| | - S.W. Lee
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| | - M.-C. Rho
- Natural Product Research Center; Korea Research Institute of Bioscience and Biotechnology; 181 Ipsin-gil Jeongeup-si Jeonbuk 56212 Korea
| |
Collapse
|
207
|
Kaur J, Lee S, Park YS, Sharma A. RAPD analysis of Leuconostoc mesenteroides strains associated with vegetables and food products from Korea. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2016.11.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
208
|
Li Z, Rui J, Li X, Li J, Dong L, Huang Q, Huang C, Wang Z, Li L, Xuan P, Tang Y, Chen F. Bacterial community succession and metabolite changes during doubanjiang-meju fermentation, a Chinese traditional fermented broad bean (Vicia faba L.) paste. Food Chem 2017; 218:534-542. [DOI: 10.1016/j.foodchem.2016.09.104] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 09/02/2016] [Accepted: 09/16/2016] [Indexed: 01/12/2023]
|
209
|
Wang X, Du H, Xu Y. Source tracking of prokaryotic communities in fermented grain of Chinese strong-flavor liquor. Int J Food Microbiol 2017; 244:27-35. [DOI: 10.1016/j.ijfoodmicro.2016.12.018] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 12/22/2016] [Accepted: 12/26/2016] [Indexed: 10/20/2022]
|
210
|
Walsh AM, Crispie F, Claesson MJ, Cotter PD. Translating Omics to Food Microbiology. Annu Rev Food Sci Technol 2017; 8:113-134. [DOI: 10.1146/annurev-food-030216-025729] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aaron M. Walsh
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
- APC Microbiome Institute, University College Cork, Cork, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
| | - Fiona Crispie
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Marcus J. Claesson
- APC Microbiome Institute, University College Cork, Cork, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
| | - Paul D. Cotter
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
- APC Microbiome Institute, University College Cork, Cork, Ireland
| |
Collapse
|
211
|
Chiou TY, Suda W, Oshima K, Hattori M, Takahashi T. Changes in the bacterial community in the fermentation process of kôso, a Japanese sugar-vegetable fermented beverage. Biosci Biotechnol Biochem 2017; 81:403-410. [DOI: 10.1080/09168451.2016.1249449] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Kôso is a Japanese fermented beverage made with over 20 kinds of vegetables, mushrooms, and sugars. The changes in the bacterial population of kôso during fermentation at 25 °C over a period of 10 days were studied using 454 pyrosequencing of the 16S rRNA gene. The analysis detected 224 operational taxonomic units (OTUs) clustered from 8 DNA samples collected on days 0, 3, 7, and 10 from two fermentation batches. Proteobacteria were the dominant phylum in the starting community, but were replaced by Firmicutes within three days. Seventy-eight genera were identified from the 224 OTUs, in which Bifidobacterium, Leuconostoc, Lactococcus, and Lactobacillus dominated, accounting for over 96% of the total bacterial population after three days’ fermentation. UniFrac–Principal Coordinate Analysis of longitudinal fermented samples revealed dramatic changes in the bacterial community in kôso, resulting in significantly low diversity at the end of fermentation as compared with the complex starting community.
Collapse
Affiliation(s)
- Tai-Ying Chiou
- Laboratory of Food Science and Technology, Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, Kitami, Japan
| | - Wataru Suda
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan
| | - Kenshiro Oshima
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Masahira Hattori
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- Cooperative Major in Advanced Health Science, Graduate School of Advanced Science and Engineering, Tokyo, Japan
| | - Tomoya Takahashi
- ARSOA Research & Development Center, AOB Keioh Group Corporation, Hokuto, Japan
| |
Collapse
|
212
|
Ferrocino I, Cocolin L. Current perspectives in food-based studies exploiting multi-omics approaches. Curr Opin Food Sci 2017. [DOI: 10.1016/j.cofs.2017.01.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
213
|
McHugh AJ, Feehily C, Hill C, Cotter PD. Detection and Enumeration of Spore-Forming Bacteria in Powdered Dairy Products. Front Microbiol 2017; 8:109. [PMID: 28197144 PMCID: PMC5281614 DOI: 10.3389/fmicb.2017.00109] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 01/16/2017] [Indexed: 01/28/2023] Open
Abstract
With the abolition of milk quotas in the European Union in 2015, several member states including Ireland, Luxembourg, and Belgium have seen year on year bi-monthly milk deliveries to dairies increase by up to 35%. Milk production has also increased outside of Europe in the past number of years. Unsurprisingly, there has been a corresponding increased focus on the production of dried milk products for improved shelf life. These powders are used in a wide variety of products, including confectionery, infant formula, sports dietary supplements and supplements for health recovery. To ensure quality and safety standards in the dairy sector, strict controls are in place with respect to the acceptable quantity and species of microorganisms present in these products. A particular emphasis on spore-forming bacteria is necessary due to their inherent ability to survive extreme processing conditions. Traditional microbiological detection methods used in industry have limitations in terms of time, efficiency, accuracy, and sensitivity. The following review will explore the common spore-forming bacterial contaminants of milk powders, will review the guidelines with respect to the acceptable limits of these microorganisms and will provide an insight into recent advances in methods for detecting these microbes. The various advantages and limitations with respect to the application of these diagnostics approaches for dairy food will be provided. It is anticipated that the optimization and application of these methods in appropriate ways can ensure that the enhanced pressures associated with increased production will not result in any lessening of safety and quality standards.
Collapse
Affiliation(s)
- Aoife J McHugh
- Food Bioscience Department, Teagasc Food Research CentreCork, Ireland; School of Microbiology, University College CorkCork, Ireland
| | - Conor Feehily
- Food Bioscience Department, Teagasc Food Research CentreCork, Ireland; APC Microbiome InstituteCork, Ireland
| | - Colin Hill
- School of Microbiology, University College CorkCork, Ireland; APC Microbiome InstituteCork, Ireland
| | - Paul D Cotter
- Food Bioscience Department, Teagasc Food Research CentreCork, Ireland; APC Microbiome InstituteCork, Ireland
| |
Collapse
|
214
|
John MN, Joseph WM, Zacchaeus ON, Moses BS. Spontaneously fermented kenyan milk products: A review of the current state and future perspectives. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/ajfs2016.1516] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
|
215
|
Nie Y, Zhou Z, Guan J, Xia B, Luo X, Yang Y, Fu Y, Sun Q. Dynamic changes of yak ( Bos grunniens) gut microbiota during growth revealed by polymerase chain reaction-denaturing gradient gel electrophoresis and metagenomics. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2017; 30:957-966. [PMID: 28183172 PMCID: PMC5495674 DOI: 10.5713/ajas.16.0836] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 12/21/2016] [Accepted: 01/11/2017] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To understand the dynamic structure, function, and influence on nutrient metabolism in hosts, it was crucial to assess the genetic potential of gut microbial community in yaks of different ages. METHODS The denaturing gradient gel electrophoresis (DGGE) profiles and Illumina-based metagenomic sequencing on colon contents of 15 semi-domestic yaks were investigated. Unweighted pairwise grouping method with mathematical averages (UPGMA) clustering and principal component analysis (PCA) were used to analyze the DGGE fingerprint. The Illumina sequences were assembled, predicted to genes and functionally annotated, and then classified by querying protein sequences of the genes against the Kyoto encyclopedia of genes and genomes (KEGG) database. RESULTS Metagenomic sequencing showed that more than 85% of ribosomal RNA (rRNA) gene sequences belonged to the phylum Firmicutes and Bacteroidetes, indicating that the family Ruminococcaceae (46.5%), Rikenellaceae (11.3%), Lachnospiraceae (10.0%), and Bacteroidaceae (6.3%) were dominant gut microbes. Over 50% of non-rRNA gene sequences represented the metabolic pathways of amino acids (14.4%), proteins (12.3%), sugars (11.9%), nucleotides (6.8%), lipids (1.7%), xenobiotics (1.4%), coenzymes, and vitamins (3.6%). Gene functional classification showed that most of enzyme-coding genes were related to cellulose digestion and amino acids metabolic pathways. CONCLUSION Yaks' age had a substantial effect on gut microbial composition. Comparative metagenomics of gut microbiota in 0.5-, 1.5-, and 2.5-year-old yaks revealed that the abundance of the class Clostridia, Bacteroidia, and Lentisphaeria, as well as the phylum Firmicutes, Bacteroidetes, Lentisphaerae, Tenericutes, and Cyanobacteria, varied more greatly during yaks' growth, especially in young animals (0.5 and 1.5 years old). Gut microbes, including Bacteroides, Clostridium, and Lentisphaeria, make a contribution to the energy metabolism and synthesis of amino acid, which are essential to the normal growth of yaks.
Collapse
Affiliation(s)
- Yuanyang Nie
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| | - Zhiwei Zhou
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| | - Jiuqiang Guan
- Sichuan Grassland Science Academy, Chengdu, Sichuan, 611731, China
| | - Baixue Xia
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| | - Xiaolin Luo
- Sichuan Grassland Science Academy, Chengdu, Sichuan, 611731, China
| | - Yang Yang
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| | - Yu Fu
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| | - Qun Sun
- Key Laboratory of Biological Resources and Ecological Environment, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China
| |
Collapse
|
216
|
|
217
|
Shin GH, Kang BC, Jang DJ. Metabolic Pathways Associated with Kimchi, a Traditional Korean Food, Based on In Silico Modeling of Published Data. Genomics Inform 2016; 14:222-229. [PMID: 28154515 PMCID: PMC5287128 DOI: 10.5808/gi.2016.14.4.222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 11/23/2016] [Accepted: 12/27/2016] [Indexed: 12/24/2022] Open
Abstract
Kimchi is a traditional Korean food prepared by fermenting vegetables, such as Chinese cabbage and radishes, which are seasoned with various ingredients, including red pepper powder, garlic, ginger, green onion, fermented seafood (Jeotgal), and salt. The various unique microorganisms and bioactive components in kimchi show antioxidant activity and have been associated with an enhanced immune response, as well as anti-cancer and anti-diabetic effects. Red pepper inhibits decay due to microorganisms and prevents food from spoiling. The vast amount of biological information generated by academic and industrial research groups is reflected in a rapidly growing body of scientific literature and expanding data resources. However, the genome, biological pathway, and related disease data are insufficient to explain the health benefits of kimchi because of the varied and heterogeneous data types. Therefore, we have constructed an appropriate semantic data model based on an integrated food knowledge database and analyzed the functional and biological processes associated with kimchi in silico. This complex semantic network of several entities and connections was generalized to answer complex questions, and we demonstrated how specific disease pathways are related to kimchi consumption.
Collapse
Affiliation(s)
- Ga Hee Shin
- Data Science Center, Insilicogen, Inc., Yongin 16954, Korea
| | | | - Dai Ja Jang
- Processing Technology Research Group, Korea Food Research Institute, Seongnam 13539, Korea
| |
Collapse
|
218
|
Bora SS, Keot J, Das S, Sarma K, Barooah M. Metagenomics analysis of microbial communities associated with a traditional rice wine starter culture (Xaj-pitha) of Assam, India. 3 Biotech 2016; 6:153. [PMID: 28330225 PMCID: PMC4947050 DOI: 10.1007/s13205-016-0471-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 07/05/2016] [Indexed: 12/11/2022] Open
Abstract
This is the first report on the microbial diversity of xaj-pitha, a rice wine fermentation starter culture through a metagenomics approach involving Illumine-based whole genome shotgun (WGS) sequencing method. Metagenomic DNA was extracted from rice wine starter culture concocted by Ahom community of Assam and analyzed using a MiSeq® System. A total of 2,78,231 contigs, with an average read length of 640.13 bp, were obtained. Data obtained from the use of several taxonomic profiling tools were compared with previously reported microbial diversity studies through the culture-dependent and culture-independent method. The microbial community revealed the existence of amylase producers, such as Rhizopus delemar, Mucor circinelloides, and Aspergillus sp. Ethanol producers viz., Meyerozyma guilliermondii, Wickerhamomyces ciferrii, Saccharomyces cerevisiae, Candida glabrata, Debaryomyces hansenii, Ogataea parapolymorpha, and Dekkera bruxellensis, were found associated with the starter culture along with a diverse range of opportunistic contaminants. The bacterial microflora was dominated by lactic acid bacteria (LAB). The most frequent occurring LAB was Lactobacillus plantarum, Lactobacillus brevis, Leuconostoc lactis, Weissella cibaria, Lactococcus lactis, Weissella para mesenteroides, Leuconostoc pseudomesenteroides, etc. Our study provided a comprehensive picture of microbial diversity associated with rice wine fermentation starter and indicated the superiority of metagenomic sequencing over previously used techniques.
Collapse
Affiliation(s)
- Sudipta Sankar Bora
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, Assam, India
| | - Jyotshna Keot
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, Assam, India
| | - Saurav Das
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, Assam, India
| | - Kishore Sarma
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, Assam, India
| | - Madhumita Barooah
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, Assam, India.
| |
Collapse
|
219
|
Kyeremeh IA, Charles CJ, Rout SP, Laws AP, Humphreys PN. Microbial Community Evolution Is Significantly Impacted by the Use of Calcium Isosaccharinic Acid as an Analogue for the Products of Alkaline Cellulose Degradation. PLoS One 2016; 11:e0165832. [PMID: 27806095 PMCID: PMC5091744 DOI: 10.1371/journal.pone.0165832] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/18/2016] [Indexed: 12/03/2022] Open
Abstract
Diasteriomeric isosaccharinic acid (ISA) is an important consideration within safety assessments for the disposal of the United Kingdoms’ nuclear waste legacy, where it may potentially influence radionuclide migration. Since the intrusion of micro-organisms may occur within a disposal concept, the impact of ISA may be impacted by microbial metabolism. Within the present study we have established two polymicrobial consortia derived from a hyperalkaline soil. Here, α-ISA and a diatereomeric mix of ISAs’ were used as a sole carbon source, reflecting two common substrates appearing within the literature. The metabolism of ISA within these two consortia was similar, where ISA degradation resulted in the acetogenesis and hydrogenotrophic methanogenesis. The chemical data obtained confirm that the diastereomeric nature of ISA is likely to have no impact on its metabolism within alkaline environments. High throughput sequencing of the original soil showed a diverse community which, in the presence of ISA allowed for the dominance the Clostridiales associated taxa with Clostridium clariflavum prevalent. Further taxonomic investigation at the genus level showed that there was in fact a significant difference (p = 0.004) between the two community profiles. Our study demonstrates that the selection of carbon substrate is likely to have a significant impact on microbial community composition estimations, which may have implications with respect to a safety assessment of an ILW-GDF.
Collapse
Affiliation(s)
- Isaac A. Kyeremeh
- Department of Biology, School of Applied Sciences, University of Huddersfield, Huddersfield, West Yorkshire, United Kingdom
| | - Christopher J. Charles
- Department of Biology, School of Applied Sciences, University of Huddersfield, Huddersfield, West Yorkshire, United Kingdom
| | - Simon P. Rout
- Department of Biology, School of Applied Sciences, University of Huddersfield, Huddersfield, West Yorkshire, United Kingdom
| | - Andrew P. Laws
- Department of Biology, School of Applied Sciences, University of Huddersfield, Huddersfield, West Yorkshire, United Kingdom
| | - Paul N. Humphreys
- Department of Biology, School of Applied Sciences, University of Huddersfield, Huddersfield, West Yorkshire, United Kingdom
- * E-mail:
| |
Collapse
|
220
|
Assessment of bacterial superficial contamination in classical or ritually slaughtered cattle using metagenetics and microbiological analysis. Int J Food Microbiol 2016; 247:79-86. [PMID: 27756497 DOI: 10.1016/j.ijfoodmicro.2016.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 09/09/2016] [Accepted: 10/10/2016] [Indexed: 12/21/2022]
Abstract
The aim of this study was to investigate the influence of the slaughter technique (Halal vs Classical slaughter) on the superficial contamination of cattle carcasses, by using traditional microbiological procedures and 16S rDNA metagenetics. The purpose was also to investigate the neck area to identify bacteria originating from the digestive or the respiratory tract. Twenty bovine carcasses (10 from each group) were swabbed at the slaughterhouse, where both slaughtering methods are practiced. Two swabbing areas were chosen: one "legal" zone of 1600cm2 (composed of zones from rump, flank, brisket and forelimb) and locally on the neck area (200cm2). Samples were submitted to classical microbiology for aerobic Total Viable Counts (TVC) at 30°C and Enterobacteriaceae counts, while metagenetic analysis was performed on the same samples. The classical microbiological results revealed no significant differences between both slaughtering practices; with values between 3.95 and 4.87log CFU/100cm2 and 0.49 and 1.94log CFU/100cm2, for TVC and Enterobacteriaceae respectively. Analysis of pyrosequencing data showed that differences in the bacterial population abundance between slaughtering methods were mainly observed in the "legal" swabbing zone compared to the neck area. Bacterial genera belonging to the Actinobacteria phylum were more abundant in the "legal" swabbing zone in "Halal" samples, while Brevibacterium and Corynebacterium were encountered more in "Halal" samples, in all swabbing areas. This was also the case for Firmicutes bacterial populations (families of Aerococcaceae, Planococcaceae). Except for Planococcoceae, the analysis of Operational Taxonomic Unit (OTU) abundances of bacteria from the digestive or respiratory tract revealed no differences between groups. In conclusion, the slaughtering method does not influence the superficial microbiological pattern in terms of specific microbiological markers of the digestive or respiratory tract. However, precise analysis of taxonomy at the genus level taxonomy highlights differences between swabbing areas. Although not clearly proven in this study, differences in hygiene practices used during both slaughtering protocols could explain the differences in contamination between carcasses from both slaughtering groups.
Collapse
|
221
|
Evaluation of ginsenoside bioconversion of lactic acid bacteria isolated from kimchi. J Ginseng Res 2016; 41:524-530. [PMID: 29021699 PMCID: PMC5628348 DOI: 10.1016/j.jgr.2016.10.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 09/30/2016] [Accepted: 10/05/2016] [Indexed: 11/20/2022] Open
Abstract
Background Panax ginseng is a physiologically active plant widely used in traditional medicine that is characterized by the presence of ginsenosides. Rb1, a major ginsenoside, is used as the starting material for producing ginsenoside derivatives with enhanced pharmaceutical potentials through chemical, enzymatic, or microbial transformation. Methods To investigate the bioconversion of ginsenoside Rb1, we prepared kimchi originated bacterial strains Leuconostoc mensenteroides WiKim19, Pediococcus pentosaceus WiKim20, Lactobacillus brevis WiKim47, Leuconostoc lactis WiKim48, and Lactobacillus sakei WiKim49 and analyzed bioconversion products using LC-MS/MS mass spectrometer. Results L. mesenteroides WiKim19 and Pediococcus pentosaceus WiKim20 converted ginsenoside Rb1 into the ginsenoside Rg3 approximately five times more than Lactobacillus brevis WiKim47, Leuconostoc lactis WiKim48, and Lactobacillus sakei WiKim49. L mesenteroides WIKim19 showed positive correlation with β-glucosidase activity and higher transformation ability of ginsenoside Rb1 into Rg3 than the other strains whereas, P. pentosaceus WiKim20 showed an elevated production of Rb3 even with lack of β-glucosidase activity but have the highest acidity among the five lactic acid bacteria (LAB). Conclusion Ginsenoside Rg5 concentration of five LABs have ranged from ∼2.6 μg/mL to 6.5 μg/mL and increased in accordance with the incubation periods. Our results indicate that the enzymatic activity along with acidic condition contribute to the production of minor ginsenoside from lactic acid bacteria.
Collapse
|
222
|
Porcellato D, Skeie SB. Bacterial dynamics and functional analysis of microbial metagenomes during ripening of Dutch-type cheese. Int Dairy J 2016. [DOI: 10.1016/j.idairyj.2016.05.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
223
|
Metagenomic approach reveals microbial diversity and predictive microbial metabolic pathways in Yucha, a traditional Li fermented food. Sci Rep 2016; 6:32524. [PMID: 27578483 PMCID: PMC5006176 DOI: 10.1038/srep32524] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 08/10/2016] [Indexed: 11/23/2022] Open
Abstract
Yucha is a typical traditional fermented food of the Li population in the Hainan province of China, and it is made up of cooked rice and fresh fish. In the present study, metagenomic approach and culture-dependent technology were applied to describe the diversity of microbiota and identify beneficial microbes in the Yucha. At the genus level, Lactobacillus was the most abundant genus (43.82% of the total reads), followed by Lactococcus, Enterococcus, Vibrio, Weissella, Pediococcus, Enterobacter, Salinivibrio, Acinetobacter, Macrococcus, Kluyvera and Clostridium; this result was confirmed by q-PCR. PCoA based on Weighted UniFrac distances showed an apparent clustering pattern for Yucha samples from different locations, and Lactobacillus sakei, Lactobacillus saniviri and Staphylococcus sciuri represented OTUs according to the major identified markers. At the microbial functional level, it was observed that there was an enrichment of metabolic functional features, including amino acid and carbohydrate metabolism, which implied that the microbial metabolism in the Yucha samples tended to be vigorous. Accordingly, we further investigated the correlation between the predominant microbes and metabolic functional features. Thirteen species of Lactobacillus (147 strains) were isolated, and Lactobacillus plantarum (60 isolates) and Lactobacillus pentosus (34 isolates) were isolated from every sample.
Collapse
|
224
|
Escobar-Zepeda A, Sanchez-Flores A, Quirasco Baruch M. Metagenomic analysis of a Mexican ripened cheese reveals a unique complex microbiota. Food Microbiol 2016; 57:116-27. [DOI: 10.1016/j.fm.2016.02.004] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 02/09/2016] [Accepted: 02/09/2016] [Indexed: 11/27/2022]
|
225
|
Hiraoka S, Yang CC, Iwasaki W. Metagenomics and Bioinformatics in Microbial Ecology: Current Status and Beyond. Microbes Environ 2016; 31:204-12. [PMID: 27383682 PMCID: PMC5017796 DOI: 10.1264/jsme2.me16024] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Metagenomic approaches are now commonly used in microbial ecology to study microbial communities in more detail, including many strains that cannot be cultivated in the laboratory. Bioinformatic analyses make it possible to mine huge metagenomic datasets and discover general patterns that govern microbial ecosystems. However, the findings of typical metagenomic and bioinformatic analyses still do not completely describe the ecology and evolution of microbes in their environments. Most analyses still depend on straightforward sequence similarity searches against reference databases. We herein review the current state of metagenomics and bioinformatics in microbial ecology and discuss future directions for the field. New techniques will allow us to go beyond routine analyses and broaden our knowledge of microbial ecosystems. We need to enrich reference databases, promote platforms that enable meta- or comprehensive analyses of diverse metagenomic datasets, devise methods that utilize long-read sequence information, and develop more powerful bioinformatic methods to analyze data from diverse perspectives.
Collapse
Affiliation(s)
- Satoshi Hiraoka
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, the University of Tokyo
| | | | | |
Collapse
|
226
|
Escalante A, López Soto DR, Velázquez Gutiérrez JE, Giles-Gómez M, Bolívar F, López-Munguía A. Pulque, a Traditional Mexican Alcoholic Fermented Beverage: Historical, Microbiological, and Technical Aspects. Front Microbiol 2016; 7:1026. [PMID: 27446061 PMCID: PMC4928461 DOI: 10.3389/fmicb.2016.01026] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 06/16/2016] [Indexed: 11/28/2022] Open
Abstract
Pulque is a traditional Mexican alcoholic beverage produced from the fermentation of the fresh sap known as aguamiel (mead) extracted from several species of Agave (maguey) plants that grow in the Central Mexico plateau. Currently, pulque is produced, sold and consumed in popular districts of Mexico City and rural areas. The fermented product is a milky white, viscous, and slightly acidic liquid beverage with an alcohol content between 4 and 7° GL and history of consumption that dates back to pre-Hispanic times. In this contribution, we review the traditional pulque production process, including the microbiota involved in the biochemical changes that take place during aguamiel fermentation. We discuss the historical relevance and the benefits of pulque consumption, its chemical and nutritional properties, including the health benefits associated with diverse lactic acid bacteria with probiotic potential isolated from the beverage. Finally, we describe the actual status of pulque production as well as the social, scientific and technological challenges faced to preserve and improve the production of this ancestral beverage and Mexican cultural heritage.
Collapse
Affiliation(s)
- Adelfo Escalante
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de MéxicoCuernavaca, Mexico
| | - David R. López Soto
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de MéxicoCuernavaca, Mexico
| | - Judith E. Velázquez Gutiérrez
- Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad UniversitariaCiudad de México, Mexico
| | | | - Francisco Bolívar
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de MéxicoCuernavaca, Mexico
| | - Agustín López-Munguía
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de MéxicoCuernavaca, Mexico
| |
Collapse
|
227
|
Kang BK, Cho MS, Park DS. Red pepper powder is a crucial factor that influences the ontogeny of Weissella cibaria during kimchi fermentation. Sci Rep 2016; 6:28232. [PMID: 27311801 PMCID: PMC4911571 DOI: 10.1038/srep28232] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 05/31/2016] [Indexed: 12/14/2022] Open
Abstract
Weissella cibaria has been found in Korean kimchi and other sources, including fermented foods, Greek salami, Spanish sausages, and animal and human excrement. W. cibaria was recently reported to show anticancer, immunomodulatory, anti-inflammatory and antioxidant properties. Nevertheless, fundamental ecological succession studies are required to scientifically confirm the probiotic action of W. cibaria under various conditions, such as fermentation. Therefore, in the present study, we mined the W. cibaria KACC11862 genome in search of species-specific genes to use as new PCR targets for the detection and quantification of W. cibaria in kimchi. The sensitivity and specificity of the identified primer set from the putative outer membrane protein gene for the detection of W. cibaria KACC11862 in kimchi were analysed. Primer set specificity was evaluated using genomic DNA from eight W. cibaria isolates, 10 different species of Weissella and 13 other reference lactic acid bacteria (LAB) strains. Interestingly, by using the qPCR assay developed herein, we found that red pepper powder markedly affects the ontogeny of W. cibaria during kimchi fermentation.
Collapse
Affiliation(s)
- Bo Kyoung Kang
- Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration, Jeonju, 54874, Republic of Korea
| | - Min Seok Cho
- Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration, Jeonju, 54874, Republic of Korea
| | - Dong Suk Park
- Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration, Jeonju, 54874, Republic of Korea
| |
Collapse
|
228
|
Wu Z, Mao Y, Zhang X, Weng P. Symbolic Metabolite Analysis of Pickled Wax Gourd in Eastern China by 1H-NMR Spectroscopy and Multivariate Data. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2016. [DOI: 10.1080/10942912.2015.1099044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Zufang Wu
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo, China
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Yijun Mao
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Xin Zhang
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Peifang Weng
- School of Marine Sciences, Ningbo University, Ningbo, China
| |
Collapse
|
229
|
Exploring flavour-producing core microbiota in multispecies solid-state fermentation of traditional Chinese vinegar. Sci Rep 2016; 6:26818. [PMID: 27241188 PMCID: PMC4886211 DOI: 10.1038/srep26818] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 03/18/2016] [Indexed: 11/09/2022] Open
Abstract
Multispecies solid-state fermentation (MSSF), a natural fermentation process driven by reproducible microbiota, is an important technique to produce traditional fermented foods. Flavours, skeleton of fermented foods, was mostly produced by microbiota in food ecosystem. However, the association between microbiota and flavours and flavour-producing core microbiota are still poorly understood. Here, acetic acid fermentation (AAF) of Zhenjiang aromatic vinegar was taken as a typical case of MSSF. The structural and functional dynamics of microbiota during AAF process was determined by metagenomics and favour analyses. The dominant bacteria and fungi were identified as Acetobacter, Lactobacillus, Aspergillus, and Alternaria, respectively. Total 88 flavours including 2 sugars, 9 organic acids, 18 amino acids, and 59 volatile flavours were detected during AAF process. O2PLS-based correlation analysis between microbiota succession and flavours dynamics showed bacteria made more contribution to flavour formation than fungi. Seven genera including Acetobacter, Lactobacillus, Enhydrobacter, Lactococcus, Gluconacetobacer, Bacillus and Staphylococcus were determined as functional core microbiota for production of flavours in Zhenjiang aromatic vinegar, based on their dominance and functionality in microbial community. This study provides a perspective for bridging the gap between the phenotype and genotype of ecological system, and advances our understanding of MSSF mechanisms in Zhenjiang aromatic vinegar.
Collapse
|
230
|
Lee YG, Cho JY, Kim YM, Moon JH. Change in Flavonoid Composition and Antioxidative Activity during Fermentation of Onion (Allium cepa L.) by Leuconostoc mesenteroides with Different Salt Concentrations. J Food Sci 2016; 81:C1385-93. [PMID: 27175820 DOI: 10.1111/1750-3841.13329] [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: 12/30/2015] [Revised: 03/20/2016] [Accepted: 04/05/2016] [Indexed: 01/16/2023]
Abstract
The aim of this study is to investigate the change in flavonoid composition and antioxidative activity during fermentation of onion (Allium cepa L.) by Leuconostoc mesenteroides with different NaCl concentrations. In order to qualify and quantify the flavonoids during fermentation of onion, 7 flavonoids, [quercetin 3,7-O-β-d-diglucopyranoside (Q3,7G), quercetin 3,4'-O-β-d-diglucopyranoside (Q3,4'G), quercetin 3-O-β-d-glucopyranoside (Q3G), quercetin 4'-O-β-d-glucopyranoside (Q4'G), isorhamnetin 3-O-β-d-glucopyranoside (IR3G), quercetin (Q), and isorhamnetin (IR)], were isolated and identified from onion. During fermentation, the contents of flavonoid glucosides (Q3,7G, Q3,4'G, Q3G, Q4'G, and IR3G) gradually decreased, whereas the contents of flavonoid aglycones (Q, IR) gradually increased. Decline rates of the flavonoid glucosides increased with the addition of L. mesenteroides. Furthermore, the activity of β-glucosidase, which is produced by L. mesenteroides, is dose-dependently inhibited with different NaCl concentrations during fermentation. The presence of L. mesenteroides enhanced the antioxidative activity of onion as demonstrated using the 1,1-diphenyl-2-picrylhydrazyl, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), and reducing power assays. The enhancement of antioxidative activity was considered because the content of flavonoid aglycones increased during fermentation. However, the addition of NaCl may decrease the antioxidative activity; we surmise that this phenomenon occurs because of the inhibition of β-glucosidase by NaCl. Therefore, we conclude that the addition of NaCl may be useful for the regulation of antioxidative activity via the control of β-glucosidase action, during the fermentation of flavonoid glucoside-rich foods.
Collapse
Affiliation(s)
- Yu Geon Lee
- Authors are with Dept. of Food Science and Technology, Functional Food Research Center, and BK21 Plus Program, Chonnam National Univ, 77 Yongbongro, Gwangju, 61186, South Korea
| | - Jeong-Yong Cho
- Authors are with Dept. of Food Science and Technology, Functional Food Research Center, and BK21 Plus Program, Chonnam National Univ, 77 Yongbongro, Gwangju, 61186, South Korea
| | - Young-Min Kim
- Authors are with Dept. of Food Science and Technology, Functional Food Research Center, and BK21 Plus Program, Chonnam National Univ, 77 Yongbongro, Gwangju, 61186, South Korea
| | - Jae-Hak Moon
- Authors are with Dept. of Food Science and Technology, Functional Food Research Center, and BK21 Plus Program, Chonnam National Univ, 77 Yongbongro, Gwangju, 61186, South Korea
| |
Collapse
|
231
|
Kim HY, Bong YJ, Jeong JK, Lee S, Kim BY, Park KY. Heterofermentative lactic acid bacteria dominate in Korean commercial kimchi. Food Sci Biotechnol 2016; 25:541-545. [PMID: 30263303 DOI: 10.1007/s10068-016-0075-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 12/16/2015] [Accepted: 12/17/2015] [Indexed: 01/10/2023] Open
Abstract
Lactic acid bacterial communities in kimchi prepared by representative Korean kimchi companies were investigated using a pyrosequencing method. The pH values of 9 kimchi varieties (K1-K9) ranged from 4.3 to 4.7, and total lactic acid bacterial (LAB) counts ranged from 1.3x107 to 1.6x109 CFU/g. Weissella, Lactobacillus, and Leuconostoc were the dominant genera accounting for 52, 28, and 20%, respectively, of identified genera. At the species level, Weissella koreensis (35%) dominated, followed by Lactobacillus graminis (13%), and Weissella cibaria (11%). Dominant LAB were all heterofermentative LAB. K1 had the most diverse operational taxonomic units (OTUs), and clustering analysis showed that distributions of microorganisms in K2, K6, K5, and K4 were similar each other. LAB communities in kimchi are diverse and heterofermentative LAB dominate in Korean commercial kimchi.
Collapse
Affiliation(s)
- Hee-Young Kim
- 1Department of Food Science and Nutrition, Pusan National University, Busan, 46241 Korea
| | - Yeon-Ju Bong
- 1Department of Food Science and Nutrition, Pusan National University, Busan, 46241 Korea
| | - Ji-Kang Jeong
- 1Department of Food Science and Nutrition, Pusan National University, Busan, 46241 Korea.,2Kimchi Research Institute, Pusan National University, Busan, 46241 Korea
| | - Sungbum Lee
- Bureau of Documentary Production, Korean Broadcasting System (KBS), Seoul, 07235 Korea
| | - Byung-Yong Kim
- 4ChunLab Inc., Seoul National University, Seoul, 08826 Korea
| | - Kun-Young Park
- 1Department of Food Science and Nutrition, Pusan National University, Busan, 46241 Korea.,2Kimchi Research Institute, Pusan National University, Busan, 46241 Korea
| |
Collapse
|
232
|
Bell RL, Jarvis KG, Ottesen AR, McFarland MA, Brown EW. Recent and emerging innovations in Salmonella detection: a food and environmental perspective. Microb Biotechnol 2016; 9:279-92. [PMID: 27041363 PMCID: PMC4835567 DOI: 10.1111/1751-7915.12359] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 02/22/2016] [Accepted: 03/03/2016] [Indexed: 01/08/2023] Open
Abstract
Salmonella is a diverse genus of Gram‐negative bacilli and a major foodborne pathogen responsible for more than a million illnesses annually in the United States alone. Rapid, reliable detection and identification of this pathogen in food and environmental sources is key to safeguarding the food supply. Traditional microbiological culture techniques have been the ‘gold standard’ for State and Federal regulators. Unfortunately, the time to result is too long to effectively monitor foodstuffs, especially those with very short shelf lives. Advances in traditional microbiology and molecular biology over the past 25 years have greatly improved the speed at which this pathogen is detected. Nonetheless, food and environmental samples possess a distinctive set of challenges for these newer, more rapid methodologies. Furthermore, more detailed identification and subtyping strategies still rely heavily on the availability of a pure isolate. However, major shifts in DNA sequencing technologies are meeting this challenge by advancing the detection, identification and subtyping of Salmonella towards a culture‐independent diagnostic framework. This review will focus on current approaches and state‐of‐the‐art next‐generation advances in the detection, identification and subtyping of Salmonella from food and environmental sources.
Collapse
Affiliation(s)
- Rebecca L Bell
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Karen G Jarvis
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD, USA
| | - Andrea R Ottesen
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Melinda A McFarland
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Eric W Brown
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| |
Collapse
|
233
|
Assessment throughout a whole fishing year of the dominant microbiota of peeled brown shrimp (Crangon crangon) stored for 7 days under modified atmosphere packaging at 4 °C without preservatives. Food Microbiol 2016. [DOI: 10.1016/j.fm.2015.10.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
234
|
Tamang JP, Watanabe K, Holzapfel WH. Review: Diversity of Microorganisms in Global Fermented Foods and Beverages. Front Microbiol 2016; 7:377. [PMID: 27047484 PMCID: PMC4805592 DOI: 10.3389/fmicb.2016.00377] [Citation(s) in RCA: 335] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/08/2016] [Indexed: 01/03/2023] Open
Abstract
Culturalable and non-culturable microorganisms naturally ferment majority of global fermented foods and beverages. Traditional food fermentation represents an extremely valuable cultural heritage in most regions, and harbors a huge genetic potential of valuable but hitherto undiscovered strains. Holistic approaches for identification and complete profiling of both culturalable and non-culturable microorganisms in global fermented foods are of interest to food microbiologists. The application of culture-independent technique has thrown new light on the diversity of a number of hitherto unknown and non-cultural microorganisms in naturally fermented foods. Functional bacterial groups ("phylotypes") may be reflected by their mRNA expression in a particular substrate and not by mere DNA-level detection. An attempt has been made to review the microbiology of some fermented foods and alcoholic beverages of the world.
Collapse
Affiliation(s)
- Jyoti P. Tamang
- Department of Microbiology, School of Life Sciences, Sikkim UniversityTadong, India
| | - Koichi Watanabe
- Department of Animal Science and Technology, National Taiwan UniversityTaipei, Taiwan
| | - Wilhelm H. Holzapfel
- Advance Green Energy and Environment Institute, Handong Global UniversityPohang-si, South Korea
| |
Collapse
|
235
|
Zhao N, Zhang C, Yang Q, Guo Z, Yang B, Lu W, Li D, Tian F, Liu X, Zhang H, Chen W. Selection of Taste Markers Related to Lactic Acid Bacteria Microflora Metabolism for Chinese Traditional Paocai: A Gas Chromatography-Mass Spectrometry-Based Metabolomics Approach. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:2415-2422. [PMID: 26915389 DOI: 10.1021/acs.jafc.5b05332] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Traditional paocai brine (PB) is continuously propagated by back-slopping and contains numerous lactic acid bacteria (LAB) strains. Although PB is important for the quality of paocai (Chinese sauerkraut), the taste features, taste-related compounds of PB-paocai and the effects of LAB communities from PB on the taste compounds remain unclear. An electronic tongue was used to evaluate the taste features of 13 PB-paocai samples. Umami, saltiness, bitterness, sweetness, and aftertaste astringency were the main taste features of PB-paocai. A total of 14 compounds were identified as discriminant taste markers for PB-paocai via gas chromatography-mass spectrometry (GC-MS)-based multimarker profiling. A LAB co-culture (Lactobacillus plantarum, Lactobacillus buchneri, and Pediococcus ethanoliduran) from PB could significantly increase glutamic acid (umami), sucrose (sweetness), glycine (sweetness), lactic acid (sourness), and γ-aminobutyric acid in PB-paocai, which would endow it with important flavor features. Such features could then facilitate starter screening and fermentation optimization to produce paocai-related foods with better nutritional and sensory qualities.
Collapse
Affiliation(s)
- Nan Zhao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Chuchu Zhang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Qin Yang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Zhuang Guo
- Northwest Hubei Research Institute of Traditional Fermented Food, College of Chemical Engineering and Food Science, Hubei University of Arts and Science , Xiangyang, Hubei 441053, People's Republic of China
| | - Bo Yang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Wenwei Lu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Dongyao Li
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Fengwei Tian
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
- U.K.-China Joint Centre on Probiotic Bacteria , Norwich NR4 7UA, United Kingdom
| | - Xiaoming Liu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
- U.K.-China Joint Centre on Probiotic Bacteria , Norwich NR4 7UA, United Kingdom
| | - Wei Chen
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, People's Republic of China
- U.K.-China Joint Centre on Probiotic Bacteria , Norwich NR4 7UA, United Kingdom
- Beijing Innovation Centre of Food Nutrition and Human Health, Beijing Technology and Business University , Beijing 100048, People's Republic of China
| |
Collapse
|
236
|
Jung JY, Lee HJ, Chun BH, Jeon CO. Effects of Temperature on Bacterial Communities and Metabolites during Fermentation of Myeolchi-Aekjeot, a Traditional Korean Fermented Anchovy Sauce. PLoS One 2016; 11:e0151351. [PMID: 26977596 PMCID: PMC4792383 DOI: 10.1371/journal.pone.0151351] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 02/27/2016] [Indexed: 11/18/2022] Open
Abstract
Myeolchi-aekjeot (MA) in Korea is produced outdoors without temperature controls, which is a major obstacle to produce commercial MA products with uniform quality. To investigate the effects of temperature on MA fermentation, pH, bacterial abundance and community, and metabolites were monitored during fermentation at 15°C, 20°C, 25°C, and 30°C. Initial pH values were approximately 6.0, and pH values increased after approximately 42 days, with faster increases at higher temperatures. Bacterial abundances increased rapidly in all MA samples after quick initial decreases during early fermentation and then they again steadily decreased after reaching their maxima, which were significantly greater at higher temperatures. Bacterial community analysis revealed that Proteobacteria and Tenericutes were predominant in all initial MA samples, but they were rapidly displaced by Firmicutes as fermentation progressed. Photobacterium and Mycoplasma belonging to Proteobacteria and Tenericutes, respectively, which may include potentially pathogenic strains, were dominant in initial MA, but decreased with the growth of Chromohalobacter, which occurred faster at higher temperatures--they were dominant until 273 and 100 days at 15°C and 20°C, respectively, but not detected after 30 days at 25°C and 30°C. Chromohalobacter also decreased with the appearance of subsequent genera belonging to Firmicutes in all MA samples. Tetragenococcus, halophilic lactic acid bacteria, appeared predominantly at 20°C, 25°C, and 30°C; they were most abundant at 30°C, but not detected at 15°C. Alkalibacillus and Lentibacillus appeared as dominant genera with the decrease of Tetragenococcus at 25°C and 30°C, but only Lentibacillus was dominant at 15°C and 20°C. Metabolite analysis showed that amino acids related to tastes were major metabolites and their concentrations were relatively higher at high temperatures. This study suggests that high temperatures (approximately 30°C) may be appropriate in MA fermentation, in the light of faster disappearance of potentially pathogenic genera, higher amino acids, growth of Tetragenococcus, and faster fermentation.
Collapse
Affiliation(s)
- Ji Young Jung
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Hyo Jung Lee
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Byung Hee Chun
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Che Ok Jeon
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
- * E-mail:
| |
Collapse
|
237
|
Park H, Shin H, Lee K, Holzapfel W. Autoinducer-2 properties of kimchi are associated with lactic acid bacteria involved in its fermentation. Int J Food Microbiol 2016; 225:38-42. [PMID: 26977818 DOI: 10.1016/j.ijfoodmicro.2016.03.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 03/03/2016] [Accepted: 03/06/2016] [Indexed: 11/17/2022]
Abstract
Bacteria use the cell density-dependent quorum signalling system to regulate particular gene expressions. In food microbiology, signalling is well known for its relation to (foodborne) pathogenicity, food spoilage, and biofilm formation. Quorum quenching and inhibition are thus being considered as a feasible approach in food preservation and safety. In the case of the luxS-mediated universal quorum sensing using autoinducer-2 (AI-2), however, it could be a different issue. Several studies have reported a luxS AI-2 synthase homologue in numerous bacteria, comprising both pathogens and beneficial strains. A recent study has shown the AI-2 signal to restore the balance of the major phyla of the gut microbiota in antibiotic-induced dysbiosis. We measured the AI-2 activity of the lactic fermented food, kimchi, and found different AI-2 signalling intensities. In order to trace the origin of the signal production, we obtained 229 lactic acid bacterial isolates from the kimchi samples, and detected the AI-2 properties of each isolate using a modified AI-2 bioluminescence assay. Our results showed isolates of dominant species of the genera Lactobacillus, Weissella and Leuconostoc which either produced or inhibited the AI-2 signal. No isolate of the dominant species Lactobacillus sakei (75 isolates) and Lactobacillus curvatus (28 isolates) showed AI-2 producing activity, while AI-2 inhibition could not be detected for any of the 31 Lactobacillus plantarum isolates. These results suggest the AI-2 activity of kimchi to result from the interaction of the associated microbial food cultures (MFCs) during fermentation. Thus far, only sparse information is available on AI-2 signalling interaction in fermented food, however, we suggest that fermented food may be a supplier of AI-2 signalling molecules via typical MFCs.
Collapse
Affiliation(s)
- Hyunjoon Park
- School of Life Sciences, Handong Global University, Pohang, Gyeongbuk 791-708, South Korea; Graduate School of Advanced Green Energy and Environment (AGEE), Handong Global University, Pohang, Gyeongbuk 791-708, South Korea
| | - Heuynkil Shin
- School of Life Sciences, Handong Global University, Pohang, Gyeongbuk 791-708, South Korea
| | - Kyuyeon Lee
- School of Life Sciences, Handong Global University, Pohang, Gyeongbuk 791-708, South Korea; Graduate School of Advanced Green Energy and Environment (AGEE), Handong Global University, Pohang, Gyeongbuk 791-708, South Korea
| | - Wilhelm Holzapfel
- Graduate School of Advanced Green Energy and Environment (AGEE), Handong Global University, Pohang, Gyeongbuk 791-708, South Korea.
| |
Collapse
|
238
|
Delhalle L, Korsak N, Taminiau B, Nezer C, Burteau S, Delcenserie V, Poullet JB, Daube G. Exploring the Bacterial Diversity of Belgian Steak Tartare Using Metagenetics and Quantitative Real-Time PCR Analysis. J Food Prot 2016; 79:220-9. [PMID: 26818982 DOI: 10.4315/0362-028x.jfp-15-185] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Steak tartare is a popular meat dish in Belgium. It is prepared with raw minced beef and is eaten with sauce, vegetables, and spices. Because it contains raw meat, steak tartare is highly prone to bacterial spoilage. The objective of this study was to explore the diversity of bacterial flora in steak tartare in Belgium according to the source and to determine which bacteria are able to grow during shelf life. A total of 58 samples from butchers' shops, restaurants, sandwich shops, and supermarkets were collected. These samples were analyzed using 16S rDNA metagenetics, a classical microbiological technique, and quantitative real-time PCR (qPCR) targeting the Lactobacillus genus. Samples were analyzed at the beginning and at the end of their shelf life, except for those from restaurants and sandwich shops, which were analyzed only on the purchase date. Metagenetic analysis identified up to 180 bacterial species and 90 genera in some samples. But only seven bacterial species were predominant in the samples, depending on the source: Brochothrix thermosphacta, Lactobacillus algidus, Lactococcus piscium, Leuconostoc gelidum, Photobacterium kishitani, Pseudomonas spp., and Xanthomonas oryzae. With this work, an alternative method is proposed to evaluate the total flora in food samples based on the number of reads from metagenetic analysis and the results of qPCR. The degree of underestimation of aerobic plate counts at 30°C estimated with the classical microbiology method was demonstrated in comparison with the proposed culture-independent method. Compared with culture-based methods, metagenetic analysis combined with qPCR targeting Lactobacillus provides valuable information for characterizing the bacterial flora of raw meat.
Collapse
Affiliation(s)
- L Delhalle
- University of Lìege, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, Department of Food Science, Sart-Tilman, B43bis, 4000 Liege, Belgium; Quality Partner, Belgium, Rue Hayeneux 62, 4040 Herstal, Belgium.
| | - N Korsak
- University of Lìege, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, Department of Food Science, Sart-Tilman, B43bis, 4000 Liege, Belgium
| | - B Taminiau
- University of Lìege, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, Department of Food Science, Sart-Tilman, B43bis, 4000 Liege, Belgium
| | - C Nezer
- Quality Partner, Belgium, Rue Hayeneux 62, 4040 Herstal, Belgium
| | - S Burteau
- Quality Partner, Belgium, Rue Hayeneux 62, 4040 Herstal, Belgium
| | - V Delcenserie
- University of Lìege, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, Department of Food Science, Sart-Tilman, B43bis, 4000 Liege, Belgium
| | - J B Poullet
- Quality Partner, Belgium, Rue Hayeneux 62, 4040 Herstal, Belgium
| | - G Daube
- University of Lìege, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, Department of Food Science, Sart-Tilman, B43bis, 4000 Liege, Belgium
| |
Collapse
|
239
|
Bokulich NA, Lewis ZT, Boundy-Mills K, Mills DA. A new perspective on microbial landscapes within food production. Curr Opin Biotechnol 2016; 37:182-189. [PMID: 26773388 PMCID: PMC4913695 DOI: 10.1016/j.copbio.2015.12.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 12/10/2015] [Accepted: 12/15/2015] [Indexed: 01/01/2023]
Abstract
High-throughput, 'next-generation' sequencing tools offer many exciting new possibilities for food research. From investigating microbial dynamics within food fermentations to the ecosystem of the food-processing built environment, amplicon sequencing, metagenomics, and transcriptomics present novel applications for exploring microbial communities in, on, and around our foods. This review discusses the many uses of these tools for food-related and food facility-related research and highlights where they may yield nuanced insight into the microbial world of food production systems.
Collapse
Affiliation(s)
- Nicholas A Bokulich
- Department of Viticulture and Enology, University of California, Davis, CA 95616,United States; Department of Food Science and Technology, University of California, Davis, CA 95616,United States; Foods for Health Institute, University of California, Davis, CA 95616, United States
| | - Zachery T Lewis
- Department of Food Science and Technology, University of California, Davis, CA 95616,United States; Foods for Health Institute, University of California, Davis, CA 95616, United States
| | - Kyria Boundy-Mills
- Department of Food Science and Technology, University of California, Davis, CA 95616,United States
| | - David A Mills
- Department of Viticulture and Enology, University of California, Davis, CA 95616,United States; Department of Food Science and Technology, University of California, Davis, CA 95616,United States; Foods for Health Institute, University of California, Davis, CA 95616, United States.
| |
Collapse
|
240
|
Zhao D, Du RP, Ge JP, Wang XY, Mu LQ, Ping WX. Impact of Lactobacillus paracasei HD1.7 as a Starter Culture on Characteristics of Fermented Chinese Cabbage ( Brassica rapa var. pekinensis). FOOD SCIENCE AND TECHNOLOGY RESEARCH 2016. [DOI: 10.3136/fstr.22.325] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Dan Zhao
- Key Laboratory of Microbiology, Life Science College, Heilongjiang University
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University
- Forestry College, Northeast Forestry University
| | - Ren Peng Du
- Key Laboratory of Microbiology, Life Science College, Heilongjiang University
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University
| | - Jing Ping Ge
- Key Laboratory of Microbiology, Life Science College, Heilongjiang University
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University
| | - Xiao Yu Wang
- Key Laboratory of Microbiology, Life Science College, Heilongjiang University
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University
| | - Li Qaing Mu
- Forestry College, Northeast Forestry University
| | - Wen Xiang Ping
- Key Laboratory of Microbiology, Life Science College, Heilongjiang University
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University
| |
Collapse
|
241
|
Chen P, Wu Z, Zhao Y, Wei Y, Xu R, Yan L, Li H. Cultivation-independent comprehensive investigations on bacterial communities in serofluid dish, a traditional Chinese fermented food. GENOMICS DATA 2015; 7:127-8. [PMID: 26981386 PMCID: PMC4778640 DOI: 10.1016/j.gdata.2015.12.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Accepted: 12/23/2015] [Indexed: 11/30/2022]
Abstract
Serofluid dish (or Jiangshui, in Chinese), a traditional food in the Chinese culture, is made from vegetables by fermentation. In this study, bacterial community of the fermented serofluid dish was assessed by Illumina amplicon sequencing. The metagenome comprised of 49,589 average raw reads with an average 11,497,917 bp and G + C content is 52.46%. This is the first report on V4 hyper-variable region of the 16S rRNA metagenome sequence employing Illumina platform to profile the microbial community of this little known fermented food from Gansu Province, China. The metagenome sequence can be accessed at NCBI, SRA database accession no. SRP065370.
Collapse
Affiliation(s)
- Peng Chen
- School of Pharmacy, Lanzhou University, Donggang West Road No. 199, Lanzhou 730020, PR China
| | - Zhengrong Wu
- School of Pharmacy, Lanzhou University, Donggang West Road No. 199, Lanzhou 730020, PR China
| | - Yang Zhao
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China
| | - Yan Wei
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China
| | - Ruixiang Xu
- School of Pharmacy, Lanzhou University, Donggang West Road No. 199, Lanzhou 730020, PR China
| | - Lei Yan
- College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, PR China
| | - Hongyu Li
- School of Pharmacy, Lanzhou University, Donggang West Road No. 199, Lanzhou 730020, PR China
| |
Collapse
|
242
|
Ates O. Systems Biology of Microbial Exopolysaccharides Production. Front Bioeng Biotechnol 2015; 3:200. [PMID: 26734603 PMCID: PMC4683990 DOI: 10.3389/fbioe.2015.00200] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 11/30/2015] [Indexed: 11/23/2022] Open
Abstract
Exopolysaccharides (EPSs) produced by diverse group of microbial systems are rapidly emerging as new and industrially important biomaterials. Due to their unique and complex chemical structures and many interesting physicochemical and rheological properties with novel functionality, the microbial EPSs find wide range of commercial applications in various fields of the economy such as food, feed, packaging, chemical, textile, cosmetics and pharmaceutical industry, agriculture, and medicine. EPSs are mainly associated with high-value applications, and they have received considerable research attention over recent decades with their biocompatibility, biodegradability, and both environmental and human compatibility. However, only a few microbial EPSs have achieved to be used commercially due to their high production costs. The emerging need to overcome economic hurdles and the increasing significance of microbial EPSs in industrial and medical biotechnology call for the elucidation of the interrelations between metabolic pathways and EPS biosynthesis mechanism in order to control and hence enhance its microbial productivity. Moreover, a better understanding of biosynthesis mechanism is a significant issue for improvement of product quality and properties and also for the design of novel strains. Therefore, a systems-based approach constitutes an important step toward understanding the interplay between metabolism and EPS biosynthesis and further enhances its metabolic performance for industrial application. In this review, primarily the microbial EPSs, their biosynthesis mechanism, and important factors for their production will be discussed. After this brief introduction, recent literature on the application of omics technologies and systems biology tools for the improvement of production yields will be critically evaluated. Special focus will be given to EPSs with high market value such as xanthan, levan, pullulan, and dextran.
Collapse
Affiliation(s)
- Ozlem Ates
- Department of Medical Services and Techniques, Nisantasi University, Istanbul, Turkey
| |
Collapse
|
243
|
Reva ON, Zaets IE, Ovcharenko LP, Kukharenko OE, Shpylova SP, Podolich OV, de Vera JP, Kozyrovska NO. Metabarcoding of the kombucha microbial community grown in different microenvironments. AMB Express 2015; 5:124. [PMID: 26061774 PMCID: PMC4467805 DOI: 10.1186/s13568-015-0124-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 05/28/2015] [Indexed: 11/28/2022] Open
Abstract
Introducing of the DNA metabarcoding analysis of probiotic microbial communities allowed getting insight into their functioning and establishing a better control on safety and efficacy of the probiotic communities. In this work the kombucha poly-microbial probiotic community was analysed to study its flexibility under different growth conditions. Environmental DNA sequencing revealed a complex and flexible composition of the kombucha microbial culture (KMC) constituting more bacterial and fungal organisms in addition to those found by cultural method. The community comprised bacterial and yeast components including cultured and uncultivable microorganisms. Culturing the KMC under different conditions revealed the core part of the community which included acetobacteria of two genera Komagataeibacter (former Gluconacetobacter) and Gluconobacter, and representatives of several yeast genera among which Brettanomyces/Dekkera and Pichia (including former Issatchenkia) were dominant. Herbaspirillum spp. and Halomonas spp., which previously had not been described in KMC, were found to be minor but permanent members of the community. The community composition was dependent on the growth conditions. The bacterial component of KMC was relatively stable, but may include additional member—lactobacilli. The yeast species composition was significantly variable. High-throughput sequencing showed complexity and variability of KMC that may affect the quality of the probiotic drink. It was hypothesized that the kombucha core community might recruit some environmental bacteria, particularly lactobacilli, which potentially may contribute to the fermentative capacity of the probiotic drink. As many KMC-associated microorganisms cannot be cultured out of the community, a robust control for community composition should be provided by using DNA metabarcoding.
Collapse
|
244
|
Kergourlay G, Taminiau B, Daube G, Champomier Vergès MC. Metagenomic insights into the dynamics of microbial communities in food. Int J Food Microbiol 2015; 213:31-9. [DOI: 10.1016/j.ijfoodmicro.2015.09.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 09/04/2015] [Accepted: 09/13/2015] [Indexed: 02/06/2023]
|
245
|
Moon JY, Kwon SW, Hong SB, Seok SJ, Kim JS, Kim SJ. Characteristics and functional analysis of Bacillus strains from the fermented soybean products, Cheonggukjang. ACTA ACUST UNITED AC 2015. [DOI: 10.7845/kjm.2015.5044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
246
|
Fang RS, Dong YC, Chen F, Chen QH. Bacterial Diversity Analysis during the Fermentation Processing of Traditional Chinese Yellow Rice Wine Revealed by 16S rDNA 454 Pyrosequencing. J Food Sci 2015; 80:M2265-71. [PMID: 26409170 DOI: 10.1111/1750-3841.13018] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 08/04/2015] [Indexed: 01/08/2023]
Abstract
Rice wine is a traditional Chinese fermented alcohol drink. Spontaneous fermentation with the use of the Chinese starter and wheat Qu lead to the growth of various microorganisms during the complete brewing process. It's of great importance to fully understand the composition of bacteria diversity in rice wine in order to improve the quality and solve safety problems. In this study, a more comprehensive bacterial description was shown with the use of bacteria diversity analysis, which enabled us to have a better understanding. Rarefaction, rank abundance, alpha Diversity, beta diversity and principal coordinates analysis simplified their complex bacteria components and provide us theoretical foundation for further investigation. It has been found bacteria diversity is more abundant at mid-term and later stage of brewing process. Bacteria community analysis reveals there is a potential safety hazard existing in the fermentation, since most of the sequence reads are assigned to Enterobacter (7900 at most) and Pantoea (7336 at most), followed by Staphylococcus (2796 at most) and Pseudomonas (1681 at most). Lactic acid bacteria are rare throughout the fermentation process which is not in accordance with other reports. This work may offer us an opportunity to investigate micro ecological fermentation system in food industry.
Collapse
Affiliation(s)
- Ruo-si Fang
- Dept. of Food Science and Nutrition, Zhejiang Univ, Hangzhou, 310058, China
| | - Ya-chen Dong
- Dept. of Food Science and Nutrition, Zhejiang Univ, Hangzhou, 310058, China
| | - Feng Chen
- Dept. of Food Science and Nutrition, Zhejiang Univ, Hangzhou, 310058, China
| | - Qi-he Chen
- Food Science and Human Nutrition, Clemson Univ, S.C, 29634, U.S.A
| |
Collapse
|
247
|
Jarvis KG, White JR, Grim CJ, Ewing L, Ottesen AR, Beaubrun JJG, Pettengill JB, Brown E, Hanes DE. Cilantro microbiome before and after nonselective pre-enrichment for Salmonella using 16S rRNA and metagenomic sequencing. BMC Microbiol 2015; 15:160. [PMID: 26264042 PMCID: PMC4534111 DOI: 10.1186/s12866-015-0497-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 07/28/2015] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Salmonella enterica is a common cause of foodborne gastroenteritis in the United States and is associated with outbreaks in fresh produce such as cilantro. Salmonella culture-based detection methods are complex and time consuming, and improvments to increase detection sensitivity will benefit consumers. In this study, we used 16S rRNA sequencing to determine the microbiome of cilantro. We also investigated changes to the microbial community prior to and after a 24-hour nonselective pre-enrichment culture step commonly used by laboratory analysts to resuscitate microorganisms in foods suspected of contamination with pathogens. Cilantro samples were processed for Salmonella detection according to the method in the United States Food and Drug Administration Bacteriological Analytical Manual. Genomic DNA was extracted from culture supernatants prior to and after a 24-hour nonselective pre-enrichment step and 454 pyrosequencing was performed on 16S rRNA amplicon libraries. A database of Enterobacteriaceae 16S rRNA sequences was created, and used to screen the libraries for Salmonella, as some samples were known to be culture positive. Additionally, culture positive cilantro samples were examined for the presence of Salmonella using shotgun metagenomics on the Illumina MiSeq. RESULTS Time zero uncultured samples had an abundance of Proteobacteria while the 24-hour enriched samples were composed mostly of Gram-positive Firmicutes. Shotgun metagenomic sequencing of Salmonella culture positive cilantro samples revealed variable degrees of Salmonella contamination among the sequenced samples. CONCLUSIONS Our cilantro study demonstrates the use of high-throughput sequencing to reveal the microbiome of cilantro, and how the microbiome changes during the culture-based protocols employed by food safety laboratories to detect foodborne pathogens. Finding that culturing the cilantro shifts the microbiome to a predominance of Firmicutes suggests that changing our culture-based methods will improve detection sensitivity for foodborne enteric pathogens.
Collapse
Affiliation(s)
- Karen G Jarvis
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, OARSA, Laurel, MD, USA.
| | - James R White
- Oak Ridge Institute for Science and Technology, Oak Ridge, TN, USA.
| | - Christopher J Grim
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, OARSA, Laurel, MD, USA.
- Oak Ridge Institute for Science and Technology, Oak Ridge, TN, USA.
| | - Laura Ewing
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, OARSA, Laurel, MD, USA.
| | - Andrea R Ottesen
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, ORS, College Park, MD, USA.
| | - Junia Jean-Gilles Beaubrun
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, OARSA, Laurel, MD, USA.
| | - James B Pettengill
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, ORS, College Park, MD, USA.
| | - Eric Brown
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, ORS, College Park, MD, USA.
| | - Darcy E Hanes
- U. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, OARSA, Laurel, MD, USA.
| |
Collapse
|
248
|
Lee SH, Jung JY, Jeon CO. Source Tracking and Succession of Kimchi Lactic Acid Bacteria during Fermentation. J Food Sci 2015; 80:M1871-7. [PMID: 26133985 DOI: 10.1111/1750-3841.12948] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Accepted: 05/28/2015] [Indexed: 11/27/2022]
Abstract
This study aimed at evaluating raw materials as potential lactic acid bacteria (LAB) sources for kimchi fermentation and investigating LAB successions during fermentation. The bacterial abundances and communities of five different sets of raw materials were investigated using plate-counting and pyrosequencing. LAB were found to be highly abundant in all garlic samples, suggesting that garlic may be a major LAB source for kimchi fermentation. LAB were observed in three and two out of five ginger and leek samples, respectively, indicating that they can also be potential important LAB sources. LAB were identified in only one cabbage sample with low abundance, suggesting that cabbage may not be an important LAB source. Bacterial successions during fermentation in the five kimchi samples were investigated by community analysis using pyrosequencing. LAB communities in initial kimchi were similar to the combined LAB communities of individual raw materials, suggesting that kimchi LAB were derived from their raw materials. LAB community analyses showed that species in the genera Leuconostoc, Lactobacillus, and Weissella were key players in kimchi fermentation, but their successions during fermentation varied with the species, indicating that members of the key genera may have different acid tolerance or growth competitiveness depending on their respective species.
Collapse
Affiliation(s)
- Se Hee Lee
- Dept. of Life Science, Chung-Ang Univ, Seoul, 156-756, Republic of Korea
| | - Ji Young Jung
- Dept. of Life Science, Chung-Ang Univ, Seoul, 156-756, Republic of Korea
| | - Che Ok Jeon
- Dept. of Life Science, Chung-Ang Univ, Seoul, 156-756, Republic of Korea
| |
Collapse
|
249
|
Lee HJ, Jeong SE, Kim PJ, Madsen EL, Jeon CO. High resolution depth distribution of Bacteria, Archaea, methanotrophs, and methanogens in the bulk and rhizosphere soils of a flooded rice paddy. Front Microbiol 2015; 6:639. [PMID: 26161079 PMCID: PMC4479796 DOI: 10.3389/fmicb.2015.00639] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/12/2015] [Indexed: 11/24/2022] Open
Abstract
The communities and abundances of methanotrophs and methanogens, along with the oxygen, methane, and total organic carbon (TOC) concentrations, were investigated along a depth gradient in a flooded rice paddy. Broad patterns in vertical profiles of oxygen, methane, TOC, and microbial abundances were similar in the bulk and rhizosphere soils, though methane and TOC concentrations and 16S rRNA gene copies were clearly higher in the rhizosphere soil than in the bulk soil. Oxygen concentrations decreased sharply to below detection limits at 8 mm depth. Pyrosequencing of 16S rRNA genes showed that bacterial and archaeal communities varied according to the oxic, oxic-anoxic, and anoxic zones, indicating that oxygen is a determining factor for the distribution of bacterial and archaeal communities. Aerobic methanotrophs were maximally observed near the oxic-anoxic interface, while methane, TOC, and methanogens were highest in the rhizosphere soil at 30–200 mm depth, suggesting that methane is produced mainly from organic carbon derived from rice plants and is metabolized aerobically. The relative abundances of type I methanotrophs such as Methylococcus, Methylomonas, and Methylocaldum decreased more drastically than those of type II methanotrophs (such as Methylocystis and Methylosinus) with increasing depth. Methanosaeta and Methanoregula were predominant methanogens at all depths, and the relative abundances of Methanosaeta, Methanoregula, and Methanosphaerula, and GOM_Arc_I increased with increasing depth. Based on contrasts between absolute abundances of methanogens and methanotrophs at depths sampled across rhizosphere and bulk soils (especially millimeter-scale slices at the surface), we have identified populations of methanogens (Methanosaeta, Methanoregula, Methanocella, Methanobacterium, and Methanosphaerula), and methanotrophs (Methylosarcina, Methylococcus, Methylosinus, and unclassified Methylocystaceae) that are likely physiologically active in situ.
Collapse
Affiliation(s)
- Hyo Jung Lee
- Department of Life Science, Chung-Ang University Seoul, South Korea
| | - Sang Eun Jeong
- Department of Life Science, Chung-Ang University Seoul, South Korea
| | - Pil Joo Kim
- Division of Applied Life Science, Gyeongsang National University Jinju, South Korea
| | - Eugene L Madsen
- Department of Microbiology, Cornell University Ithaca, NY, USA
| | - Che Ok Jeon
- Department of Life Science, Chung-Ang University Seoul, South Korea
| |
Collapse
|
250
|
Wu Z, Zhuang B, Weng P, Zhang X. Fermentation Quality Characteristics and Flavor Formation Changes During the Process of Pickled Wax Gourd in Eastern Zhejiang. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2015. [DOI: 10.1080/10942912.2015.1027775] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|