1
|
Ezekiel CN, Ayeni KI, Ezeokoli OT, Sulyok M, van Wyk DAB, Oyedele OA, Akinyemi OM, Chibuzor-Onyema IE, Adeleke RA, Nwangburuka CC, Hajšlová J, Elliott CT, Krska R. High-Throughput Sequence Analyses of Bacterial Communities and Multi-Mycotoxin Profiling During Processing of Different Formulations of Kunu, a Traditional Fermented Beverage. Front Microbiol 2019; 9:3282. [PMID: 30687270 PMCID: PMC6333642 DOI: 10.3389/fmicb.2018.03282] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 12/17/2018] [Indexed: 02/05/2023] Open
Abstract
Kunu is a traditional fermented single or mixed cereals-based beverage popularly consumed in many parts of West Africa. Presently, the bacterial community and mycotoxin contamination profiles during processing of various kunu formulations have never been comprehensively studied. This study, therefore, investigated the bacterial community and multi-mycotoxin dynamics during the processing of three kunu formulations using high-throughput sequence analysis of partial 16S rRNA gene (hypervariable V3-V4 region) and liquid chromatography tandem mass spectrometry (LC-MS/MS), respectively. A total of 2,303 operational taxonomic units (OTUs) were obtained across six processing stages in all three kunu formulations. Principal coordinate analysis biplots of the Bray-Curtis dissimilarity between bacterial communities revealed the combined influences of formulations and processing steps. Taxonomically, OTUs spanned 13 phyla and 486 genera. Firmicutes (phylum) dominated (relative abundance) most of the processing stages, while Proteobacteria dominated the rest of the stages. Lactobacillus (genus taxa level) dominated most processing stages and the final product (kunu) of two formulations, whereas Clostridium sensu stricto (cluster 1) dominated kunu of one formulation, constituting a novel observation. We further identified Acetobacter, Propionibacterium, Gluconacetobacter, and Gluconobacter previously not associated with kunu processing. Shared phylotypes between all communities were dominated by lactic acid bacteria including species of Lactobacillus, Lactococcus, Leuconostoc, Pediococcus, and Weissella. Other shared phylotypes included notable acetic acid bacteria and potential human enteric pathogens. Ten mycotoxins [3-Nitropropionic acid, aflatoxicol, aflatoxin B1 (AFB1), AFB2, AFM1, alternariol (AOH), alternariolmethylether (AME), beauvericin (BEAU), citrinin, and moniliformin] were quantified at varying concentrations in ingredients for kunu processing. Except for AOH, AME, and BEAU that were retained at minimal levels of < 2 μg/kg in the final product, most mycotoxins in the ingredients were not detectable after processing. In particular, mycotoxin levels were substantially reduced by fermentation, although simple dilution and sieving also contributed to mycotoxin reduction. This study reinforces the perception of kunu as a rich source of bacteria with beneficial attributes to consumer health, and provides in-depth understanding of the microbiology of kunu processing, as well as information on mycotoxin contamination and reduction during this process. These findings may aid the development of starter culture technology for safe and quality kunu production.
Collapse
Affiliation(s)
- Chibundu N. Ezekiel
- Department of Microbiology, Babcock University, Ilishan Remo, Nigeria
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Tulln, Austria
| | - Kolawole I. Ayeni
- Department of Microbiology, Babcock University, Ilishan Remo, Nigeria
| | - Obinna T. Ezeokoli
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council-Institute for Soil, Climate and Water, Pretoria, South Africa
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Michael Sulyok
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Tulln, Austria
| | - Deidre A. B. van Wyk
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council-Institute for Soil, Climate and Water, Pretoria, South Africa
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | | | | | | | - Rasheed A. Adeleke
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council-Institute for Soil, Climate and Water, Pretoria, South Africa
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Cyril C. Nwangburuka
- Department of Agriculture and Industrial Technology, Babcock University, Ilishan Remo, Nigeria
| | - Jana Hajšlová
- University of Chemistry and Technology, Prague, Czechia
| | - Christopher T. Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen’s University Belfast, Belfast, United Kingdom
| | - Rudolf Krska
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Tulln, Austria
- Institute for Global Food Security, School of Biological Sciences, Queen’s University Belfast, Belfast, United Kingdom
| |
Collapse
|
2
|
Ojuri OT, Ezekiel CN, Sulyok M, Ezeokoli OT, Oyedele OA, Ayeni KI, Eskola MK, Šarkanj B, Hajšlová J, Adeleke RA, Nwangburuka CC, Elliott CT, Krska R. Assessing the mycotoxicological risk from consumption of complementary foods by infants and young children in Nigeria. Food Chem Toxicol 2018; 121:37-50. [DOI: 10.1016/j.fct.2018.08.025] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 08/12/2018] [Accepted: 08/13/2018] [Indexed: 12/22/2022]
|
3
|
Ademola OM, Adeyemi TE, Ezeokoli OT, Ayeni KI, Obadina AO, Somorin YM, Omemu AM, Adeleke RA, Nwangburuka CC, Oluwafemi F, Oyewole OB, Ezekiel CN. Phylogenetic analyses of bacteria associated with the processing of iru and ogiri condiments. Lett Appl Microbiol 2018; 67:354-362. [PMID: 29947432 DOI: 10.1111/lam.13040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 05/26/2018] [Accepted: 06/22/2018] [Indexed: 01/29/2023]
Abstract
Analysis of the bacterial community dynamics during the production of traditional fermented condiments is important for food safety assessment, quality control and development of starter culture technology. In this study, bacteria isolated during the processing of iru and ogiri, two commonly consumed condiments in Nigeria, were characterized based on phylogenetic analyses of the bacterial 16S rRNA gene. A total of 227 isolates were obtained and clustered into 12 operational taxonomic units (OTUs) based on 97% 16S rRNA gene similarity. The OTUs spanned three phyla (Firmicutes, Actinobacteria and Proteobacteria), and nine genera: Acinetobacter, Aerococcus, Bacillus, Enterococcus, Enterobacter, Lysinibacillus, Micrococcus, Proteus and Staphylococcus. OTUs closely related to species of Bacillus dominated the processing stages of both condiments. Although no single OTU occurred throughout iru processing stages, an OTU (mostly related to B. safensis) dominated the ogiri processing stages indicating potentials for the development of starter culture. However, other isolates such as those of Enterococcus spp. and Lysinibacillus spp. may be potential starters for iru fermentation. Presumptive food-borne pathogens were also detected at some stages of the condiments' processing, possibly due to poor hygienic practices. SIGNIFICANCE AND IMPACT OF THE STUDY Iru and ogiri are important condiments used for flavour enhancement in foods and serve as protein substitutes in diets among rural populations across West Africa. Consumption of these condiments is growing, reinforcing the need to scale up their production. Production of these condiments includes spontaneous fermentation, which often leads to inconsistent product quality and unguaranteed safety. This study has demonstrated the bacterial succession in iru and ogiri processing and highlights species that could be selected and exploited for starter culture development. This study provides a starting point to produce quality and microbiologically safe iru and ogiri condiments.
Collapse
Affiliation(s)
- O M Ademola
- Department of Food Science and Technology, Federal University of Agriculture, Abeokuta, Nigeria
| | - T E Adeyemi
- Department of Microbiology, Federal University of Agriculture, Abeokuta, Nigeria
| | - O T Ezeokoli
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council-Institute for Soil, Climate and Water, Arcadia, South Africa.,Unit for Environmental Science and Management, North-West University (Potchefstroom Campus), Potchefstroom, South Africa
| | - K I Ayeni
- Department of Microbiology, School of Science and Technology, Babcock University, Ilishan Remo, Nigeria
| | - A O Obadina
- Department of Food Science and Technology, Federal University of Agriculture, Abeokuta, Nigeria
| | - Y M Somorin
- Microbiology, School of Natural Sciences, National University of Ireland, Galway, Ireland
| | - A M Omemu
- Department of Hospitality and Tourism Management, Federal University of Agriculture, Abeokuta, Nigeria
| | - R A Adeleke
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council-Institute for Soil, Climate and Water, Arcadia, South Africa.,Unit for Environmental Science and Management, North-West University (Potchefstroom Campus), Potchefstroom, South Africa
| | - C C Nwangburuka
- Department of Agriculture, School of Science and Technology, Babcock University, Ilishan Remo, Nigeria
| | - F Oluwafemi
- Department of Microbiology, Federal University of Agriculture, Abeokuta, Nigeria
| | - O B Oyewole
- Department of Food Science and Technology, Federal University of Agriculture, Abeokuta, Nigeria
| | - C N Ezekiel
- Department of Microbiology, School of Science and Technology, Babcock University, Ilishan Remo, Nigeria
| |
Collapse
|
4
|
Adedeji BS, Ezeokoli OT, Ezekiel CN, Obadina AO, Somorin YM, Sulyok M, Adeleke RA, Warth B, Nwangburuka CC, Omemu AM, Oyewole OB, Krska R. Bacterial species and mycotoxin contamination associated with locust bean, melon and their fermented products in south-western Nigeria. Int J Food Microbiol 2017; 258:73-80. [DOI: 10.1016/j.ijfoodmicro.2017.07.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Revised: 07/06/2017] [Accepted: 07/24/2017] [Indexed: 12/22/2022]
|
5
|
Okeke CA, Ezekiel CN, Nwangburuka CC, Sulyok M, Ezeamagu CO, Adeleke RA, Dike SK, Krska R. Bacterial Diversity and Mycotoxin Reduction During Maize Fermentation (Steeping) for Ogi Production. Front Microbiol 2015; 6:1402. [PMID: 26697001 PMCID: PMC4678208 DOI: 10.3389/fmicb.2015.01402] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 11/24/2015] [Indexed: 11/16/2022] Open
Abstract
Bacterial diversity and community structure of two maize varieties (white and yellow) during fermentation/steeping for ogi production, and the influence of spontaneous fermentation on mycotoxin reduction in the gruel were studied. A total of 142 bacterial isolates obtained at 24-96 h intervals were preliminarily identified by conventional microbiological methods while 60 selected isolates were clustered into 39 OTUs consisting of 15 species, 10 genera, and 3 phyla by 16S rRNA sequence analysis. Lactic acid bacteria constituted about 63% of all isolated bacteria and the genus Pediococcus dominated (white maize = 84.8%; yellow maize = 74.4%). Pediococcus acidilactici and Lactobacillus paraplantarum were found at all steeping intervals of white and yellow maize, respectively, while P. claussenii was present only at the climax stage of steeping white maize. In both maize varieties, P. pentosaceus was found at 24-72 h. Mycotoxin concentrations (μg/kg) in the unsteeped grains were: white maize (aflatoxin B1 = 0.60; citrinin = 85.8; cyclopiazonic acid = 23.5; fumonisins (B1/B2/B3) = 68.4-483; zearalenone = 3.3) and yellow maize (aflatoxins (B1/B2/M1) = 22.7-513; citrinin = 16,800; cyclopiazonic acid = 247; fumonisins (B1/B2/B3) = 252-1,586; zearalenone = 205). Mycotoxins in both maize varieties were significantly (p < 0.05) reduced across steeping periods. This study reports for the first time: (a) the association of L. paraplantarum, P. acidilactici, and P. claussenii with ogi production from maize, (b) citrinin occurrence in Nigerian maize and ogi, and
Collapse
Affiliation(s)
- Chiamaka A. Okeke
- Department of Biosciences and Biotechnology, Babcock UniversityIlishan Remo, Nigeria
| | - Chibundu N. Ezekiel
- Department of Biosciences and Biotechnology, Babcock UniversityIlishan Remo, Nigeria
| | - Cyril C. Nwangburuka
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council–Institute for Soil, Climate and WaterPretoria, South Africa
- Department of Agriculture, Babcock UniversityIlishan Remo, Nigeria
| | - Michael Sulyok
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences ViennaTulln, Austria
| | - Cajethan O. Ezeamagu
- Department of Biosciences and Biotechnology, Babcock UniversityIlishan Remo, Nigeria
| | - Rasheed A. Adeleke
- Microbiology and Environmental Biotechnology Research Group, Agricultural Research Council–Institute for Soil, Climate and WaterPretoria, South Africa
- Unit for Environmental Science and Management, North-West University at PotchefstroomPotchefstroom, South Africa
| | - Stanley K. Dike
- Department of Microbiology, Imo State UniversityOwerri, Nigeria
| | - Rudolf Krska
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences ViennaTulln, Austria
| |
Collapse
|