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Atter A, Diaz M, Tano-Debrah K, Parry-Hanson Kunadu A, Mayer MJ, Sayavedra L, Misita C, Amoa-Awua W, Narbad A. The predominant lactic acid bacteria and yeasts involved in the spontaneous fermentation of millet during the production of the traditional porridge Hausa koko in Ghana. BMC Microbiol 2024; 24:163. [PMID: 38745280 DOI: 10.1186/s12866-024-03317-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 05/03/2024] [Indexed: 05/16/2024] Open
Abstract
Spontaneous fermentation of cereals like millet involves a diverse population of microbes from various sources, including raw materials, processing equipment, fermenting receptacles, and the environment. Here, we present data on the predominant microbial species and their succession at each stage of the Hausa koko production process from five regions of Ghana. The isolates were enumerated using selective media, purified, and phenotypically characterised. The LAB isolates were further characterised by 16S rRNA Sanger sequencing, typed using (GTG)5 repetitive-PCR, and whole genome sequencing, while 28S rRNA Sanger sequencing was performed for yeast identification. The pH of the millet grains ranged from mean values of 6.02-6.53 to 3.51-3.99 in the final product, depending on the processors. The mean LAB and yeast counts increased during fermentation then fell to final counts of log 2.77-3.95 CFU/g for LAB and log 2.10-2.98 CFU/g for yeast in Hausa koko samples. At the various processing stages, the counts of LAB and yeast revealed significant variations (p < 0.0001). The species of LAB identified in this study were Limosilactobacillus pontis, Pediococcus acidilactici, Limosilactobacillus fermentum, Limosilactobacillus reuteri, Pediococcus pentosaceus, Lacticaseibacillus paracasei, Lactiplantibacillus plantarum, Schleiferilactobacillus harbinensis, and Weissella confusa. The yeasts were Saccharomyces cf. cerevisiae/paradoxus, Saccharomyces cerevisiae, Pichia kudriavzevii, Clavispora lusitaniae and Candida tropicalis. The identification and sequencing of these novel isolates and how they change during the fermentation process will pave the way for future controlled fermentation, safer starter cultures, and identifying optimal stages for starter culture addition or nutritional interventions. These LAB and yeast species are linked to many indigenous African fermented foods, potentially acting as probiotics in some cases. This result serves as the basis for further studies into the technological and probiotic potential of these Hausa koko microorganisms.
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Affiliation(s)
- Amy Atter
- Food Microbiology and Mushroom Research Division, CSIR-Food Research Institute, Accra, Ghana.
- Department of Nutrition and Food Science, University of Ghana, Accra, Ghana.
- Food and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK.
| | - Maria Diaz
- Food and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Kwaku Tano-Debrah
- Department of Nutrition and Food Science, University of Ghana, Accra, Ghana
| | | | - Melinda J Mayer
- Gut Microbes and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Lizbeth Sayavedra
- Gut Microbes and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Collins Misita
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, Ghana
| | - Wisdom Amoa-Awua
- Food Microbiology and Mushroom Research Division, CSIR-Food Research Institute, Accra, Ghana
- Department of Agro-Processing Technology and Food Bio-Sciences, CSIR College of Science and Technology, Accra, Ghana
| | - Arjan Narbad
- Food and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
- Gut Microbes and Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
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Yang L, Wang J, Lv H, Ji XM, Liu JM, Wang S. Hollow-Structured Microporous Organic Networks Adsorbents Enabled Specific and Sensitive Identification and Determination of Aflatoxins. Toxins (Basel) 2022; 14:137. [PMID: 35202164 PMCID: PMC8875801 DOI: 10.3390/toxins14020137] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 02/05/2022] [Accepted: 02/11/2022] [Indexed: 02/04/2023] Open
Abstract
Aflatoxin (AFT) contamination, commonly in foods and grains with extremely low content while high toxicity, has caused serious economic and health problems worldwide. Now researchers are making an effort to develop nanomaterials with remarkable adsorption capacity for the identification, determination and regulation of AFT. Herein, we constructed a novel hollow-structured microporous organic networks (HMONs) material. On the basis of Fe3O4@MOF@MON, hydrofluoric acid (HF) was introduced to remove the transferable metal organic framework (MOF) to give hollow MON structures. Compared to the original Fe3O4@MOF@MON, HMON showed improved surface area and typical hollow cavities, thus increasing the adsorption capacity. More importantly, AFT is a hydrophobic substance, and our constructed HMON had a higher water contact angle, greatly enhancing the adsorption affinity. From that, the solid phase extraction (SPE-HPLC) method developed based on HMONs was applied to analyze four kinds of actual samples, with satisfied recoveries of 85-98%. This work provided a specific and sensitive method for the identification and determination of AFT in the food matrix and demonstrated the great potential of HMONs in the field of the identification and control of mycotoxins.
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Affiliation(s)
| | | | | | | | - Jing-Min Liu
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin 300071, China; (L.Y.); (J.W.); (H.L.); (X.-M.J.)
| | - Shuo Wang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin 300071, China; (L.Y.); (J.W.); (H.L.); (X.-M.J.)
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Yan Y, Chen H, Sun L, Zhang W, Lu X, Li Z, Xu J, Ren Q. The changes of microbial diversity and flavor compounds during the fermentation of millet Huangjiu, a traditional Chinese beverage. PLoS One 2022; 17:e0262353. [PMID: 34986204 PMCID: PMC8730391 DOI: 10.1371/journal.pone.0262353] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Accepted: 12/21/2021] [Indexed: 02/01/2023] Open
Abstract
Huangjiu is a national alcoholic beverage in China. Millet has congenital advantages in development and utilization of nutrient. Brewing Huangjiu with millet can increase the value of millet. Microbial community plays crucial roles in millet Huangjiu fermentation. Flavor compounds reflect the quality and health function of Huangjiu. The flavor compounds of Huangjiu are complex and their formation is closely associated with microorganisms, but the relationship between them during fermentation has been unknown. In this research, this relationship during millet Huangjiu fermentation were deeply investigated. Totally 86 volatile compounds were detected. Bacillus, Weissella, Paenibacillus, Klebsiella, Prevotella was investigated as the dominant microbes through high-throughput sequencing. 537 correlations between major flavor compounds and microbes were established to reflect the dynamic change during millet Huangjiu fermentation. The top five dominant genus of flavor producing microbes were Chryseobacterium, Sporolactobacillus, Psychrobacter, Sphingobium and Anoxybacillus. The content of malic acid and citric acid was gradually improved all through the millet Huangjiu fermentation. Malic acid and citric acid generated from millet Huangjiu fermentation shows healthy properties as liver protection and eliminating fatigue. Our research provides essential information on microbial community succession and the flavor formation during millet Huangjiu fermentation, and beneficial for development of Huangjiu products.
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Affiliation(s)
- Yi Yan
- School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing, China
| | - Haiyan Chen
- School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing, China
| | - Leping Sun
- School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing, China
| | - Wei Zhang
- College of Food Science and Technology, Hebei Agricultural University, Baoding, China
| | - Xin Lu
- State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Zhenpeng Li
- State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Jialiang Xu
- School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing, China
| | - Qing Ren
- School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, Beijing, China
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Gbashi S, Njobeh PB, Madala NE, De Boevre M, Kagot V, De Saeger S. Parallel validation of a green-solvent extraction method and quantitative estimation of multi-mycotoxins in staple cereals using LC-MS/MS. Sci Rep 2020; 10:10334. [PMID: 32587262 PMCID: PMC7316717 DOI: 10.1038/s41598-020-66787-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 05/13/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, 15 different mycotoxins were estimated in three staple cereals from selected agro-ecological regions in Nigeria using a 'novel' green extraction method, pressurized hot water extraction (PHWE) in comparison to a conventional solvent extraction method. Discrimination of the results of PHWE and solvent extraction using principal component analysis (PCA) and orthogonal projection to latent structures discriminate analysis (OPLS-DA) did not yield any differential clustering patterns. All maize samples (n = 16), 32% (n = 38) of sorghum and 35% (n = 37) of millet samples were positive for at least one of the 15 tested mycotoxins. Contamination levels for the cereals were higher in the warm humid rain forest region and gradually decreased towards the hot and arid region in the north of the country. The results demonstrate the applicability of PHWE as a possible alternative extraction method to conventional methods of extraction, which are solvent based.
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Affiliation(s)
- Sefater Gbashi
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, P.O Box 17011, Doornfontein Campus, 2028, Gauteng, South Africa.
| | - Patrick Berka Njobeh
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, P.O Box 17011, Doornfontein Campus, 2028, Gauteng, South Africa.
| | - Ntakadzeni Edwin Madala
- Department of Biochemistry, School of Mathematical and Natural Sciences, University of Venda, Thohoyandou, South Africa
| | - Marthe De Boevre
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Ghent University, 9000, Ghent, Belgium
| | - Victor Kagot
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Ghent University, 9000, Ghent, Belgium
| | - Sarah De Saeger
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, P.O Box 17011, Doornfontein Campus, 2028, Gauteng, South Africa
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Ghent University, 9000, Ghent, Belgium
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Dhanshetty M, Banerjee K. Simultaneous Direct Analysis of Aflatoxins and Ochratoxin A in Cereals and Their Processed Products by Ultra-High Performance Liquid Chromatography with Fluorescence Detection. J AOAC Int 2019; 102:1666-1672. [PMID: 31039831 DOI: 10.5740/jaoacint.19-0048] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Mycotoxins such as aflatoxins (AFs) and ochratoxin A (OTA) can pose severe health hazards because of their toxicity. Given a wide range of food matrices susceptible to fungal infections and possible cooccurrence of mycotoxins at different concentrations, validated multimycotoxin and multimatrix methods are strongly warranted. Objective: The aim of this research was to develop a simple and fast ultra-high performance LC (UHPLC) fluorescence detection (FLD)-based method to simultaneously determine AFs (B1, G1, B2, and G2) and OTA and, furthermore, to carry out single-laboratory validation in a range of cereals and processed product matrices. Methods: The sample preparation involved homogenization and extraction with methanol-water (80 + 20). For cleanup, an aliquot (3 mL) was diluted with phosphate-buffered saline, loaded on an immunoaffinity column (AFLAOCHRA PREP®), and eluted with methanol (1 mL). The cleaned extract was diluted with 0.2% acetic acid (at a 1:1 ratio) before injection into an ultra-high performance liquid chromatograph. To perform simultaneous analysis of AFs and OTA, the FLD program was developed by switching the excitation wavelength in a single chromatographic run. Results: The method provided LOQs of 0.25 and 1 ng/g for AFs and OTA, respectively, without involving any derivatization. In rice, the recoveries of AFs ranged from 84 to 106%, whereas OTA had a recovery above 72%, with the repeatability relative SDs <12% for both analytes. The method was successfully applied to a range of naturally contaminated market samples. Conclusions: The method is suitable for regulatory testing because of its significant time and cost effectiveness and sensitivity in compliance with the regulatory maximum levels. Highlights: The study achieves high-throughput analysis of AFs and OTA in raw and processed cereals using simultaneous extraction, cleanup, and UHPLC-FLD. Method sensitivity complies with the regulatory maximum levels. Single-laboratory validation results meet analytical QC requirements.
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Affiliation(s)
- Manisha Dhanshetty
- ICAR-National Research Centre for Grapes, National Referral Laboratory, Pune 412307, India
| | - Kaushik Banerjee
- ICAR-National Research Centre for Grapes, National Referral Laboratory, Pune 412307, India
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Owusu-Kwarteng J, Tano-Debrah K, Akabanda F, Jespersen L. Technological properties and probiotic potential of Lactobacillus fermentum strains isolated from West African fermented millet dough. BMC Microbiol 2015; 15:261. [PMID: 26560346 PMCID: PMC4642623 DOI: 10.1186/s12866-015-0602-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 11/06/2015] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Throughout Africa, food fermentations are still driven by indigenous microorganisms which influence the nutritional, organoleptic and safety of the final products. However, for improved safety, consistent quality and beneficial health effects, a trend has emerged which involves the isolation of indigenous strains from traditional fermented products to be used as functional starter cultures. These functional starter cultures possess inherent functional characteristics and can contribute to food quality and safety by offering one or more organoleptic, nutritional, technological or health advantage (probiotics). With the aim of selecting potential probiotic starter cultures, Lactobacillus fermentum strains isolated from fermented millet dough were investigated for technological properties and probiotic traits in-vitro. RESULTS A total of 176 L. fermentum strains were assessed for technological properties including rate of acidification, exopolysaccharide production and amylase activity. Following this, 48 strains showing desirable technological properties were first screened for acid resistance. Sixteen acid resistant strains were assessed for additional probiotic properties including resistance to bile salts, bile salt hydrolysis, antimicrobial property, haemolysis and antibiotics resistance. L. fermentum strains clustered into 3 groups represented by 36 %, 47 % and 17 % as fast, medium and slow acidifiers respectively. About 8 %, 78 % and 14 % of the strains showed strong, weak and no exopolysaccharides production respectively. Amylase activity was generally weak or not detected. After exposure of 48 L. fermentum strains to pH 2.5 for 4 h, 16 strains were considered to be acid resistant. All 16 strains were resistant to bile salt. Four strains demonstrated bile salt hydrolysis. Antimicrobial activity was observed towards Listeria monocytogenes and Staphylococcus aureus but not E. coli and Salmonella enteritidis. Lactobacillus fermentum strains were generally susceptible to antibiotics except 6 strains which showed resistance towards streptomycin, gentamicin and kanamycin. CONCLUSION In vitro determination of technological and probiotic properties have shown strain specific difference among L. fermentum strains isolated from fermented millet dough. Sixteen (16) L. fermentum strains have been shown to possess desirable technological and probiotic characteristics in vitro. These strains are therefore good candidates for further studies to elucidate their full potential and possible application as novel probiotic starter cultures.
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Affiliation(s)
- James Owusu-Kwarteng
- Department of Applied Biology, Faculty of Applied Sciences, University for Development Studies, P. O. Box 24, Navrongo Campus, Navrongo, Ghana.
| | - Kwaku Tano-Debrah
- Department of Nutrition and Food Science, University of Ghana, P. O. Box 134, Legon-Accra, Ghana.
| | - Fortune Akabanda
- Department of Applied Biology, Faculty of Applied Sciences, University for Development Studies, P. O. Box 24, Navrongo Campus, Navrongo, Ghana.
| | - Lene Jespersen
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, DK 1958, Frederiksberg C, Denmark.
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