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Hongchao D, Ma L, Xu Z, Soteyome T, Yuan L, Yang Z, Jiao XA. Invited review: Role of Bacillus licheniformis in the dairy industry- friends or foes? J Dairy Sci 2024:S0022-0302(24)00904-4. [PMID: 38851582 DOI: 10.3168/jds.2024-24826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Accepted: 05/07/2024] [Indexed: 06/10/2024]
Abstract
Bacillus licheniformis is one of the major spore-forming bacteria with great genotypic diversity in raw milk, dairy ingredients, final dairy products, and is found throughout the dairy processing continuum. Though being widely used as a probiotic strain, this species also serves as a potential risk in the dairy industry based on its roles in foodborne illness and dairy spoilage. Biofilm formation of B. licheniformis in combined with the heat resistance of its spores, make it impossible to prevent the presence of B. licheniformis in final dairy products by traditional cleaning and disinfection procedures. Despite the extensive efforts on the identification of B. licheniformis from various dairy samples, no reviews have been reported on both hazard and benefits of this spore-former. This review discusses the prevalence of B. licheniformis from raw milk to commercial dairy products, biofilm formation and spoilage potential of B. licheniformis, and its potential prevention methods. In addition, the potential benefits of B. licheniformis in the dairy industry were also summarized.
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Affiliation(s)
- Dai Hongchao
- School of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127 China; Jiangsu Key Laboratory of Zoonoses, Yangzhou, Jiangsu, 225009 China
| | - Lili Ma
- School of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127 China
| | - Zhenbo Xu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou 510640, China; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand
| | - Thanapop Soteyome
- Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand
| | - Lei Yuan
- School of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127 China; Jiangsu Key Laboratory of Zoonoses, Yangzhou, Jiangsu, 225009 China.
| | - Zhenquan Yang
- School of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127 China
| | - Xin-An Jiao
- Jiangsu Key Laboratory of Zoonoses, Yangzhou, Jiangsu, 225009 China
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Wang H, Yin X, Zhang L, Wang X, Zhang J, Wen R, Cao J. Insight into the Relationship between the Causes of Off-Odour and Microorganism Communities in Xuanwei Ham. Foods 2024; 13:776. [PMID: 38472889 PMCID: PMC10930425 DOI: 10.3390/foods13050776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/26/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
To expound on the correlation between the microorganism communities and the formation of off-odour in Xuanwei ham, the microorganism communities and volatile compounds were investigated in the biceps femoris (BF) and semimembranosus (SM) of Xuanwei ham with different quality grades (normal ham and spoiled ham). The single molecule real-time sequencing showed that differential bacteria and fungi were more varied in normal hams than in spoiled hams. Headspace solid-phase microextraction-gas chromatography (HS-SPME-GC-MS) results indicated that aldehydes and alcohols were significantly higher in spoiled hams than those in normal hams (p < 0.05). The off-odour of spoiled hams was dominated by ichthyic, malodourous, sweaty, putrid, sour, and unpleasant odours produced by compounds such as trimethylamine (SM: 13.05 μg/kg), hexanal (BF: 206.46 μg/kg), octanal (BF: 59.52 μg/kg), methanethiol (SM: 12.85 μg/kg), and valeric acid (BF: 15.08 μg/kg), which are positively correlated with Bacillus cereus, Bacillus subtilis, Bacillus licheniformis, Pseudomonas sp., Aspergillus ruber, and Moraxella osloensis. Furthermore, the physicochemical property and quality characteristics results showed that high moisture (BF: 56.32 g/100 g), pH (BF: 6.63), thiobarbituric acid reactive substances (TBARS) (SM: 1.98 MDA/kg), and low NaCl content (SM: 6.31%) were also responsible for the spoilage of hams with off-odour. This study provided a deep insight into the off-odour of Xuanwei ham from the perspective of microorganism communities and a theoretical basis for improving the flavour and overall quality of Xuanwei hams.
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Affiliation(s)
- Haoyi Wang
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
| | - Xiaoyu Yin
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
| | - Lu Zhang
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
| | - Xuejiao Wang
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
| | - Jiliang Zhang
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
| | - Rongxin Wen
- College of Life Sciences, Yantai University, Yantai 264005, China;
| | - Jianxin Cao
- College of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; (H.W.); (X.Y.); (L.Z.); (X.W.); (J.Z.)
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Uvarova YE, Demenkov PS, Kuzmicheva IN, Venzel AS, Mischenko EL, Ivanisenko TV, Efimov VM, Bannikova SV, Vasilieva AR, Ivanisenko VA, Peltek SE. Accurate noise-robust classification of Bacillus species from MALDI-TOF MS spectra using a denoising autoencoder. J Integr Bioinform 2023; 20:jib-2023-0017. [PMID: 37978847 PMCID: PMC10757077 DOI: 10.1515/jib-2023-0017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/10/2023] [Indexed: 11/19/2023] Open
Abstract
Bacillus strains are ubiquitous in the environment and are widely used in the microbiological industry as valuable enzyme sources, as well as in agriculture to stimulate plant growth. The Bacillus genus comprises several closely related groups of species. The rapid classification of these remains challenging using existing methods. Techniques based on MALDI-TOF MS data analysis hold significant promise for fast and precise microbial strains classification at both the genus and species levels. In previous work, we proposed a geometric approach to Bacillus strain classification based on mass spectra analysis via the centroid method (CM). One limitation of such methods is the noise in MS spectra. In this study, we used a denoising autoencoder (DAE) to improve bacteria classification accuracy under noisy MS spectra conditions. We employed a denoising autoencoder approach to convert noisy MS spectra into latent variables representing molecular patterns in the original MS data, and the Random Forest method to classify bacterial strains by latent variables. Comparison of the DAE-RF with the CM method using the artificially noisy test samples showed that DAE-RF offers higher noise robustness. Hence, the DAE-RF method could be utilized for noise-robust, fast, and neat classification of Bacillus species according to MALDI-TOF MS data.
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Affiliation(s)
- Yulia E. Uvarova
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Pavel S. Demenkov
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Kurchatov Center for Genome Research, Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Novosibirsk State University, 630090Novosibirsk, Russia
| | | | - Artur S. Venzel
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Novosibirsk State University, 630090Novosibirsk, Russia
| | - Elena L. Mischenko
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Timofey V. Ivanisenko
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Kurchatov Center for Genome Research, Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Vadim M. Efimov
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Svetlana V. Bannikova
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Asya R. Vasilieva
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
| | - Vladimir A. Ivanisenko
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Kurchatov Center for Genome Research, Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Novosibirsk State University, 630090Novosibirsk, Russia
| | - Sergey E. Peltek
- Federal Research Center Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
- Kurchatov Center for Genome Research, Institute of Cytology and Genetics SB RAS, 630090Novosibirsk, Russia
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Chentouf HF, Rahli F, Benmechernene Z, Barros-Velazquez J. 16S rRNA gene sequencing and MALDI TOF mass spectroscopy identification of Leuconostoc mesenteroides isolated from Algerian raw camel milk. J Genet Eng Biotechnol 2023; 21:51. [PMID: 37126186 PMCID: PMC10151297 DOI: 10.1186/s43141-023-00500-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 04/20/2023] [Indexed: 05/02/2023]
Abstract
BACKGROUND Eighty-three strains of Leuconostoc mesenteroides were isolated from Algerian raw camel milk. Based on morphological, biochemical, and physiological characters tests, strains were identified as Ln. mesenteroides subsp. mesenteroides. Seven strains had a remarkable antagonistic and probiotic characterization. The present study aims at identifying these strains by means of 16 s rRNA gene sequencing and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), extending phenotypic and genotypic studies done previously. RESULTS The phyloproteomic dendrograms of the studied strains based on MALDI-TOF MS provided the same identification with more intraspecific information from the 16S rRNA gene sequencing based on phylogenetic analysis. The latter were in agreement with the previous biochemical/physiological identification, the seven isolated strains were Ln. mesenteroides subsp. mesenteroides. CONCLUSIONS Remarkably, MALDI-TOF MS fingerprinting was found to be effective enough as 16S rRNA gene sequencing identification, allowing faster and more reliable analysis than biochemical/physiological methods.
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Affiliation(s)
- Hanane Fatma Chentouf
- Laboratory of Applied Microbiology, Department of Biology, Faculty of Natural Sciences and Life, University of Oran, 1 Ahmed Ben Bella, 31100, Oran, Algeria.
| | - Fouzia Rahli
- Laboratory of Applied Microbiology, Department of Biology, Faculty of Natural Sciences and Life, University of Oran, 1 Ahmed Ben Bella, 31100, Oran, Algeria
- Higher School of Biological Sciences of Oran, Oran, Algeria
| | - Zineb Benmechernene
- Laboratory of Applied Microbiology, Department of Biology, Faculty of Natural Sciences and Life, University of Oran, 1 Ahmed Ben Bella, 31100, Oran, Algeria
| | - Jorge Barros-Velazquez
- Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Sciences, University of Santiago, 27002, Lugo, Spain
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Calvigioni M, Cara A, Celandroni F, Mazzantini D, Panattoni A, Tirloni E, Bernardi C, Pinotti L, Stella S, Ghelardi E. Characterization of a Bacillus cereus strain associated with a large feed-related outbreak of severe infection in pigs. J Appl Microbiol 2022; 133:1078-1088. [PMID: 35611609 PMCID: PMC9543730 DOI: 10.1111/jam.15636] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 05/12/2022] [Accepted: 05/19/2022] [Indexed: 12/03/2022]
Abstract
Aims Bacillus cereus is often responsible for foodborne diseases and both local and systemic infections in humans. Cases of infection in other mammals are rather rare. In this study, we report a B. cereus feed‐related outbreak that caused the death of 6234 pigs in Italy. Methods and Results Massive doses of a Gram‐positive, spore‐forming bacterium were recovered from the animal feed, faeces of survived pigs and intestinal content of dead ones. The B. cereus MM1 strain was identified by MALDI‐TOF MS and typified by RAPD‐PCR. The isolate was tested for the production of PC‐PLC, proteases, hemolysins and biofilm, for motility, as well as for the presence of genes encoding tissue‐degrading enzymes and toxins. Antimicrobial resistance and pathogenicity in Galleria mellonella larvae were also investigated. Our results show that the isolated B. cereus strain is swimming‐proficient, produces PC‐PLC, proteases, hemolysins, biofilm and carries many virulence genes. The strain shows high pathogenicity in G. mellonella larvae. Conclusions The isolated B. cereus strain demonstrates an aggressive profile of pathogenicity and virulence, being able to produce a wide range of determinants potentially hazardous to pigs' health. Significance and Impact of Study This study highlights the proficiency of B. cereus to behave as a devastating pathogen in swine if ingested at high doses and underlines that more stringent quality controls are needed for livestock feeds and supplements.
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Affiliation(s)
- Marco Calvigioni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy
| | - Alice Cara
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy
| | - Francesco Celandroni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy
| | - Diletta Mazzantini
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy
| | - Adelaide Panattoni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy
| | - Erica Tirloni
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - Cristian Bernardi
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - Luciano Pinotti
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - Simone Stella
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - Emilia Ghelardi
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Italy.,Research Center Nutraceuticals and Food for Health-Nutrafood, University of Pisa, Italy
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Catania AM, Civera T, Di Ciccio PA, Grassi MA, Morra P, Dalmasso A. Characterization of Vegetative Bacillus cereus and Bacillus subtilis Strains Isolated from Processed Cheese Products in an Italian Dairy Plant. Foods 2021; 10:foods10112876. [PMID: 34829157 PMCID: PMC8622485 DOI: 10.3390/foods10112876] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 12/23/2022] Open
Abstract
Processed cheese is a commercial product characterized by high microbiological stability and extended shelf life obtained through the application of severe heat treatment. However, spore-forming bacteria can survive through thermal processes. Among them, microorganisms belonging to Bacillus genus have been reported. In this study, we examined the microbiological population of the first hours' production of processed cheeses in an Italian dairy plant during two seasons, between June and October 2020. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to identify bacteria colonies, allowing the isolation of Bacillus cereus and Bacillussubtilis strains. These results were further confirmed by amplification and sequencing of 16 rRNA bacterial region. A multi-locus sequence type (MLST) analysis was performed to assess the genetic similarity among a selection of isolates. The fourteen B. cereus strains showed two sequence types: ST-32 was observed in only one strain and the ST-371 in the remaining thirteen isolates. On the contrary, all twenty-one B. subtlis strains, included in the study, showed a new allelic profile for the pycA gene, resulting in a new sequence type: ST-249. For B. cereus strains, analysis of toxin genes was performed. All isolates were positive for nheABC, entFM, and cytK, while hblABCD, bceT, and ces were not detected. Moreover, the biofilm-forming ability of B. cereus and B. subtilis strains was assessed, and all selected isolates proved to be biofilm formers (most of them were stronger producers). Considering the genetical similarity between isolates, jointly with the capacity to produce biofilm, the presence of a recurring Bacillus population could be hypothesized.
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Alsayegh SY, Disi ZA, Al-Ghouti MA, Zouari N. Evaluation by MALDI-TOF MS and PCA of the diversity of biosurfactants and their producing bacteria, as adaption to weathered oil components. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2021; 31:e00660. [PMID: 34557388 PMCID: PMC8446580 DOI: 10.1016/j.btre.2021.e00660] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 07/12/2021] [Accepted: 07/16/2021] [Indexed: 11/23/2022]
Abstract
Indigenous Qatari bacterial strains were isolated from highly weathered oil-contaminated sites, identified, and differentiated based on their protein profiles using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS). Their diversity was demonstrated by the principal component analysis (PCA) analysis and establishment of a proteodendogram. Both were based on the protein profile of each strain. Interestingly, this approach also showed diversity within the same subspecies. This high diversity is reflected in the emulsification and solubilization activities of their extracellular biosurfactants. The highest emulsification activity (42.1 ± 2.11 AU/mL) was obtained with a strain of Lysinibacillus fusiformis (SA4) after one week of growth in the minimum salt medium in which diesel (5%) is the sole carbon source, while the highest solubilization activity (9.47% ± 0.47%) was produced by the strain Bacillus subtilis (SA6). The functional diversity of the biosurfactants was demonstrated by PCA analysis which allowed their further clustering based on the Fourier-transform infrared spectroscopy (FTIR) analysis. These findings clearly showed that two types of adaptations occur with hydrocarbons degrading bacteria in the weathered-oily soils, one related to the bacterial cell composition maintaining the biosurfactants composition and one to the biosurfactants, which are the primary tool employed by the cell to interact with the weathered oil. This finding would shed light on the potential and strategies of applications for the bioremediation of highly weathered oil-contaminated soils.
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Affiliation(s)
- Shaikha Y. Alsayegh
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, PO. Box 2713, Doha, Qatar
| | - Zulfa Al Disi
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, PO. Box 2713, Doha, Qatar
| | - Mohammad A. Al-Ghouti
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, PO. Box 2713, Doha, Qatar
| | - Nabil Zouari
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, PO. Box 2713, Doha, Qatar
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Manzulli V, Rondinone V, Buchicchio A, Serrecchia L, Cipolletta D, Fasanella A, Parisi A, Difato L, Iatarola M, Aceti A, Poppa E, Tolve F, Pace L, Petruzzi F, Rovere ID, Raele DA, Del Sambro L, Giangrossi L, Galante D. Discrimination of Bacillus cereus Group Members by MALDI-TOF Mass Spectrometry. Microorganisms 2021; 9:microorganisms9061202. [PMID: 34199368 PMCID: PMC8228078 DOI: 10.3390/microorganisms9061202] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/29/2021] [Accepted: 05/30/2021] [Indexed: 11/16/2022] Open
Abstract
Matrix-Assisted Laser Desorption/Ionization Time Of Flight Mass Spectrometry (MALDI-TOF MS) technology is currently increasingly used in diagnostic laboratories as a cost effective, rapid and reliable routine technique for the identification and typing of microorganisms. In this study, we used MALDI-TOF MS to analyze a collection of 160 strains belonging to the Bacillus cereus group (57 B. anthracis, 49 B. cereus, 1 B. mycoides, 18 B. wiedmannii, 27 B. thuringiensis, 7 B. toyonensis and 1 B. weihenstephanensis) and to detect specific biomarkers which would allow an unequivocal identification. The Main Spectra Profiles (MSPs) were added to an in-house reference library, expanding the current commercial library which does not include B. toyonensis and B. wiedmannii mass spectra. The obtained mass spectra were statistically compared by Principal Component Analysis (PCA) that revealed seven different clusters. Moreover, for the identification purpose, were generated dedicate algorithms for a rapid and automatic detection of characteristic ion peaks after the mass spectra acquisition. The presence of specific biomarkers can be used to differentiate strains within the B. cereus group and to make a reliable identification of Bacillus anthracis, etiologic agent of anthrax, which is the most pathogenic and feared bacterium of the group. This could offer a critical time advantage for the diagnosis and for the clinical management of human anthrax even in case of bioterror attacks.
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Affiliation(s)
- Viviana Manzulli
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Valeria Rondinone
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
- Correspondence: ; Tel.: +39-0881-786330
| | - Alessandro Buchicchio
- Bruker Italia s.r.l., Daltonics Division, Strada Cluentina, 26/R, 62100 Macerata, Italy;
| | - Luigina Serrecchia
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Dora Cipolletta
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Antonio Fasanella
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Antonio Parisi
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Laura Difato
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Michela Iatarola
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Angela Aceti
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Elena Poppa
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Francesco Tolve
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Lorenzo Pace
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Fiorenza Petruzzi
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Ines Della Rovere
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Donato Antonio Raele
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Laura Del Sambro
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Luigi Giangrossi
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
| | - Domenico Galante
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, 71121 Foggia, Italy; (V.M.); (L.S.); (D.C.); (A.F.); (A.P.); (L.D.); (M.I.); (A.A.); (E.P.); (F.T.); (L.P.); (F.P.); (I.D.R.); (D.A.R.); (L.D.S.); (L.G.); (D.G.)
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9
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FTIR-assisted MALDI-TOF MS for the identification and typing of bacteria. Anal Chim Acta 2020; 1111:75-82. [DOI: 10.1016/j.aca.2020.03.037] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 02/29/2020] [Accepted: 03/16/2020] [Indexed: 01/08/2023]
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10
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Simons A, Bertron A, Aubert JE, Roux C, Roques C. Characterization of the microbiome associated with in situ earthen materials. ENVIRONMENTAL MICROBIOME 2020; 15:4. [PMID: 33902730 PMCID: PMC8066951 DOI: 10.1186/s40793-019-0350-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 12/07/2019] [Indexed: 06/12/2023]
Abstract
BACKGROUND The current increase in public awareness of environmental risks is giving rise to a growth of interest in the microbiological safety of buildings. In particular, microbial proliferation on construction materials can be responsible for the degradation of indoor air quality that can increase health-risk to occupants. Raw earth materials are still widely used throughout the world and, in some cases, are linked to heritage habitats, as in the southwest of France. Moreover, these building materials are currently the subject of renewed interest for ecological and economic reasons. However, the microbial status of earthen materials raises major concerns: could the microbiome associated with such natural materials cause disease in building occupants? Very few analyses have been performed on the microbial communities present on these supports. Characterizing the raw earth material microbiome is also important for a better evaluation and understanding of the susceptibility of such materials to microbial development. This study presents the distribution of in situ bacterial and fungal communities on different raw earth materials used in construction. Various buildings were sampled in France and the microbial communities present were characterized by amplicon high-throughput sequencing (bacterial 16S rRNA gene and fungal ITS1 region). Bacterial culture isolates were identified at the species level by MALDI-TOF mass spectrometry. RESULTS The major fungal and bacterial genera identified were mainly associated with conventional outdoor and indoor environmental communities, and no specific harmful bacterial species were detected on earthen materials. However, contrary to expectations, few human-associated genera were detected in dwellings. We found lower microbial alpha-diversity in earthen material than is usually found in soil, suggesting a loss of diversity during the use of these materials in buildings. Interestingly enough, the main features influencing microbial communities were building history and room use, rather than material composition. CONCLUSIONS These results constitute a first in-depth analysis of microbial communities present on earthen materials in situ and may be considered as a first referential to investigate microbial communities on such materials according to environmental conditions and their potential health impact. The bacterial and fungal flora detected were similar to those found in conventional habitats and are thought to be mainly impacted by specific events in the building's life, such as water damage.
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Affiliation(s)
- Alexis Simons
- Laboratoire de Génie Chimique, Université de Toulouse, UMR 5503 UPS - CNRS - INPT, Toulouse, France.
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS - INSA, Toulouse, France.
| | - Alexandra Bertron
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS - INSA, Toulouse, France
| | - Jean-Emmanuel Aubert
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS - INSA, Toulouse, France
| | - Christophe Roux
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, UMR 5546 UPS - CNRS, Castanet-Tolosan, France
| | - Christine Roques
- Laboratoire de Génie Chimique, Université de Toulouse, UMR 5503 UPS - CNRS - INPT, Toulouse, France
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11
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López AC, Alippi AM. Feasibility of using RFLP of PCR-amplified 16S rRNA gene(s) for rapid differentiation of isolates of aerobic spore-forming bacteria from honey. J Microbiol Methods 2019; 165:105690. [PMID: 31425714 DOI: 10.1016/j.mimet.2019.105690] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 08/15/2019] [Accepted: 08/15/2019] [Indexed: 11/24/2022]
Abstract
This study aimed to assess the feasibility of using RFLP of PCR-amplified 16S rRNA gene (s) by using universal primers 27f/1492r and a combination of three restriction enzymes, AluI, CfoI, and TaqI, for a low-cost, rapid screen for a primarily differentiation of isolates of the complex of aerobic spore-forming bacteria commonly found in honey samples. The described method produced unique and distinguishable patterns to differentiate among 80 isolates belonging to 26 different species of Bacillus, Brevibacillus, Lysinibacillus, Rummeliibacillus, and Paenibacillus reported in honey and other apiarian sources.
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Affiliation(s)
- Ana C López
- Unidad de Bacteriología, Centro de Investigaciones de Fitopatología, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, cc 31, calle 60 y 119, 1900 La Plata, Argentina
| | - Adriana M Alippi
- Unidad de Bacteriología, Centro de Investigaciones de Fitopatología, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, cc 31, calle 60 y 119, 1900 La Plata, Argentina.
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12
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Analysis of bacteria associated with honeys of different geographical and botanical origin using two different identification approaches: MALDI-TOF MS and 16S rDNA PCR technique. PLoS One 2019; 14:e0217078. [PMID: 31120945 PMCID: PMC6532876 DOI: 10.1371/journal.pone.0217078] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 05/05/2019] [Indexed: 12/14/2022] Open
Abstract
In the presented work identification of microorganisms isolated from various types of honeys was performed. Martix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and 16S rDNA sequencing were applied to study environmental bacteria strains.With both approches, problematic spore-forming Bacillus spp, but also Staphylococcus spp., Lysinibacillus spp., Micrococcus spp. and Brevibacillus spp were identified. However, application of spectrometric technique allows for an unambiguous distinction between species/species groups e.g.B. subtilis or B. cereus groups. MALDI TOF MS and 16S rDNA sequencing allow for construction of phyloproteomic and phylogenetic trees of identified bacterial species. Furthermore, the correlation beetween physicochemical properties, geographical and botanical origin and the presence bacterial species in honey samples were investigated.
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13
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Celandroni F, Vecchione A, Cara A, Mazzantini D, Lupetti A, Ghelardi E. Identification of Bacillus species: Implication on the quality of probiotic formulations. PLoS One 2019; 14:e0217021. [PMID: 31107885 PMCID: PMC6527297 DOI: 10.1371/journal.pone.0217021] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 05/02/2019] [Indexed: 11/26/2022] Open
Abstract
Spores of several Bacillus species have long history of consumption and safe use as probiotics and a variety of formulations containing these organisms are available in the global market. Considering the difficulties in the identification of Bacillus species and the poor microbiological quality of many probiotic formulations, we used three up-to-date methodological approaches for analyzing the content of ten formulations marketed in Italy and labeled to contain Bacillus spores. We compared the performance of biochemical tests based on the BCL Vitek2 card and MALDI-TOF mass spectrometry, using 16S rDNA sequencing as the reference technique. The BCL card performed well in identifying all Bacillus probiotic strains as well as the Bruker’s MALDI Biotyper. Nevertheless, the MALDI score values were sometimes lower than those indicated by the manufacturer for correct species identification. Contaminant bacteria (Lysinibacillus fusiformis, Acinetobacter baumannii, Bacillus cereus, Brevibacillus choshinensis, Bacillus licheniformis, Bacillus badius) were detected in some formulations. Characterization of the B. cereus contaminant showed the potential pathogenicity of this strain. Microbial enumeration performed by the plate count method revealed that the number of viable cells contained in many of the analyzed products differed from the labeled amount. Overall, our data show that only two of the ten analyzed formulations qualitatively and quantitatively respect what is on the label. Since probiotic properties are most often strain specific, molecular typing of isolates of the two most common Bacillus species, B. clausii and B. coagulans, was also performed. In conclusion, the majority of the analyzed products do not comply with quality requirements, most likely leading to reduced/absent efficacy of the preparation and representing a potential infective risk for consumers.
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Affiliation(s)
- Francesco Celandroni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Alessandra Vecchione
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Alice Cara
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Diletta Mazzantini
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Antonella Lupetti
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Emilia Ghelardi
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
- Research Center Nutraceuticals and Food for Health-Nutrafood, University of Pisa, Pisa, Italy
- * E-mail:
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14
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Ulrich S, Gottschalk C, Dietrich R, Märtlbauer E, Gareis M. Identification of cereulide producing Bacillus cereus by MALDI-TOF MS. Food Microbiol 2019; 82:75-81. [PMID: 31027822 DOI: 10.1016/j.fm.2019.01.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 01/11/2019] [Accepted: 01/21/2019] [Indexed: 12/23/2022]
Abstract
The Bacillus (B.) cereus group consists of nine recognized species which are present worldwide. B. cereus play an important role in food-borne diseases by producing different toxins. Yet, only a small percentage of B. cereus strains are able to produce the heat stable cereulide, the causative agent of emetic food poisoning. To minimize the entry of emetic B. cereus into the food chain, food business operators are dependent on efficient and reliable methods enabling the differentiation between emetic and non-emetic strains. Currently, only time-consuming cell bioassays, molecular methods and tandem mass spectrometry are available for this purpose. Thus, the aim of the present study was to establish a fast and reliable method for the differentiation between emetic/non-emetic strains by MALDI-TOF MS. Selected strains/isolates of the B. cereus group as well as other Bacillus spp. (total n = 121) were cultured on sheep blood agar for 48 h before analysis. Subsequently, the cultures were directly analyzed by MALDI-TOF MS without prior extraction steps. The samples were measured in the mass range of m/z 800-1800 Da. Using ClinProTools 3.0 statistical software and Flex analysis software (Bruker Daltonics GmbH, Bremen, Germany), a differentiation between emetic/non-emetic isolates was possible with a rate of correct identification of 99.1% by means of the evaluation of two specific biomarkers (m/z 1171 and 1187 Da).
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Affiliation(s)
- Sebastian Ulrich
- Food Safety, Veterinary Faculty, Ludwig-Maximilians-University Munich, Schoenleutnerstr. 8, 85764, Oberschleissheim, Germany.
| | - Christoph Gottschalk
- Food Safety, Veterinary Faculty, Ludwig-Maximilians-University Munich, Schoenleutnerstr. 8, 85764, Oberschleissheim, Germany
| | - Richard Dietrich
- Hygiene and Technology of Milk, Veterinary Faculty, Ludwig-Maximilians-University Munich, Schoenleutnerstr. 8, 85764, Oberschleissheim, Germany
| | - Erwin Märtlbauer
- Hygiene and Technology of Milk, Veterinary Faculty, Ludwig-Maximilians-University Munich, Schoenleutnerstr. 8, 85764, Oberschleissheim, Germany
| | - Manfred Gareis
- Food Safety, Veterinary Faculty, Ludwig-Maximilians-University Munich, Schoenleutnerstr. 8, 85764, Oberschleissheim, Germany
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15
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Stern Bauer T, Hayouka Z. Random mixtures of antimicrobial peptides inhibit bacteria associated with pasteurized bovine milk. J Pept Sci 2018; 24:e3088. [DOI: 10.1002/psc.3088] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/27/2018] [Accepted: 04/30/2018] [Indexed: 01/28/2023]
Affiliation(s)
- Tal Stern Bauer
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment; The Hebrew University of Jerusalem; PO Box 12 Rehovot 76100 Israel
| | - Zvi Hayouka
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment; The Hebrew University of Jerusalem; PO Box 12 Rehovot 76100 Israel
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16
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Martin MS, Santos IC, Carlton DD, Stigler-Granados P, Hildenbrand ZL, Schug KA. Characterization of bacterial diversity in contaminated groundwater using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 622-623:1562-1571. [PMID: 29054663 DOI: 10.1016/j.scitotenv.2017.10.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/04/2017] [Accepted: 10/04/2017] [Indexed: 06/07/2023]
Abstract
Groundwater is a major source for drinking water in the United States, and therefore, its quality and quantity is of extreme importance. One major concern that has emerged is the possible contamination of groundwater due to the unconventional oil and gas extraction activities. As such, the impacts of exogenous contaminants on microbial ecology is an area to be explored to understand what are the chemical and physical conditions that allow the proliferation of pathogenic bacteria and to find alternatives for water treatment by identifying organic-degrading bacteria. In this work, we assess the interplay between groundwater quality and the microbiome in contaminated groundwaters rich in hydrocarbon gases, volatile organic and inorganic compounds, and various metals. Opportunistic pathogenic bacteria, such as Aeromonas hydrophila, Bacillus cereus, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia, were identified, increasing the risk for consumption of and exposure to these contaminated groundwaters. Additionally, antimicrobial tests revealed that many of the identified bacteria were resistant to different antibiotics. The MALDI-TOF MS results were successfully confirmed with 16S rRNA gene sequencing, proving the accuracy of this high-throughput method. Collectively, these data provide a seminal understanding of the microbial populations in contaminated groundwater overlying anthropogenic activities like unconventional oil and gas development.
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Affiliation(s)
- Misty S Martin
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | - Inês C Santos
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA; Collaborative Laboratories for Environmental Analysis and Remediation, The University of Texas at Arlington, Arlington, TX, USA
| | - Doug D Carlton
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA; Collaborative Laboratories for Environmental Analysis and Remediation, The University of Texas at Arlington, Arlington, TX, USA
| | | | - Zacariah L Hildenbrand
- Collaborative Laboratories for Environmental Analysis and Remediation, The University of Texas at Arlington, Arlington, TX, USA; Inform Environmental, LLC, Dallas, TX, USA.
| | - Kevin A Schug
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA; Collaborative Laboratories for Environmental Analysis and Remediation, The University of Texas at Arlington, Arlington, TX, USA.
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17
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Fernández-Álvarez C, Torres-Corral Y, Santos Y. Use of ribosomal proteins as biomarkers for identification of Flavobacterium psychrophilum by MALDI-TOF mass spectrometry. J Proteomics 2018; 170:59-69. [DOI: 10.1016/j.jprot.2017.09.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 09/08/2017] [Accepted: 09/14/2017] [Indexed: 10/18/2022]
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18
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Are injectable illegal polypeptide drugs safe? Case report demonstrating the presence of haemolyticBacillus cereusin 2 illegal peptide drugs. Drug Test Anal 2017; 10:791-795. [DOI: 10.1002/dta.2304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 09/12/2017] [Accepted: 09/13/2017] [Indexed: 01/18/2023]
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19
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Shu LJ, Yang YL. Bacillus Classification Based on Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry-Effects of Culture Conditions. Sci Rep 2017; 7:15546. [PMID: 29138467 PMCID: PMC5686160 DOI: 10.1038/s41598-017-15808-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 11/02/2017] [Indexed: 12/15/2022] Open
Abstract
Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a reliable and rapid technique applied widely in the identification and classification of microbes. MALDI-TOF MS has been used to identify many endospore-forming Bacillus species; however, endospores affect the identification accuracy when using MALDI-TOF MS because they change the protein composition of samples. Since culture conditions directly influence endospore formation and Bacillus growth, in this study we clarified how culture conditions influence the classification of Bacillus species by using MALDI-TOF MS. We analyzed members of the Bacillus subtilis group and Bacillus cereus group using different incubation periods, temperatures and media. Incubation period was found to affect mass spectra due to endospores which were observed mixing with vegetative cells after 24 hours. Culture temperature also resulted in different mass spectra profiles depending on the temperature best suited growth and sporulation. Conversely, the four common media for Bacillus incubation, Luria-Bertani agar, nutrient agar, plate count agar and brain-heart infusion agar did not result in any significant differences in mass spectra profiles. Profiles in the range m/z 1000-3000 were found to provide additional data to the standard ribosomal peptide/protein region m/z 3000-15000 profiles to enable easier differentiation of some highly similar species and the identification of new strains under fresh culture conditions. In summary, control of culture conditions is vital for Bacillus identification and classification by MALDI-TOF MS.
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Affiliation(s)
- Lin-Jie Shu
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.
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20
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Sato J, Nakayama M, Tomita A, Sonoda T, Hasumi M, Miyamoto T. Evaluation of repetitive-PCR and matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) for rapid strain typing of Bacillus coagulans. PLoS One 2017; 12:e0186327. [PMID: 29020109 PMCID: PMC5636150 DOI: 10.1371/journal.pone.0186327] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 09/20/2017] [Indexed: 11/17/2022] Open
Abstract
In order to establish rapid and accurate typing method for Bacillus coagulans strains which is important for controlling in some canned foods and tea-based beverages manufacturing because of the high-heat resistance of the spores and high tolerance of the vegetative cells to catechins and chemicals, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and repetitive-PCR (rep-PCR) were evaluated. For this purpose, 28 strains of B. coagulans obtained from various culture collections were tested. DNA sequence analyses of the genes encoding 16S rRNA and DNA gyrase classified the test strains into two and three groups, respectively, regardless of their phenotypes. Both MALDI-TOF MS and rep-PCR methods classified the test strains in great detail. Strains classified in each group showed similar phenotypes, such as carbohydrate utilization determined using API 50CH. In particular, the respective two pairs of strains which showed the same metabolic characteristic were classified into the same group by both MALDI-TOF MS and rep-PCR methods separating from the other strains. On the other hand, the other strains which have the different profiles of carbohydrate utilization were separated into different groups by these methods. These results suggested that the combination of MALDI-TOF MS and rep-PCR analyses was advantageous for the rapid and detailed typing of bacterial strains in respect to both phenotype and genotype.
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Affiliation(s)
- Jun Sato
- Safety Science Research, R&D, Kao Corporation, Ichikai, Tochigi, Japan.,Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, Japan
| | - Motokazu Nakayama
- Health Care Food Research, R&D, Kao Corporation, Sumida, Tokyo, Japan
| | - Ayumi Tomita
- Safety Science Research, R&D, Kao Corporation, Ichikai, Tochigi, Japan
| | - Takumi Sonoda
- Safety Science Research, R&D, Kao Corporation, Ichikai, Tochigi, Japan
| | - Motomitsu Hasumi
- Safety Science Research, R&D, Kao Corporation, Ichikai, Tochigi, Japan
| | - Takahisa Miyamoto
- Division of Food Science & Biotechnology, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, Japan
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21
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Fernández-Álvarez C, Torres-Corral Y, Saltos-Rosero N, Santos Y. MALDI-TOF mass spectrometry for rapid differentiation of Tenacibaculum species pathogenic for fish. Appl Microbiol Biotechnol 2017; 101:5377-5390. [DOI: 10.1007/s00253-017-8324-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 03/29/2017] [Accepted: 04/29/2017] [Indexed: 11/24/2022]
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22
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The Technical and Biological Reproducibility of Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) Based Typing: Employment of Bioinformatics in a Multicenter Study. PLoS One 2016; 11:e0164260. [PMID: 27798637 PMCID: PMC5087883 DOI: 10.1371/journal.pone.0164260] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 09/22/2016] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The technical, biological, and inter-center reproducibility of matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI TOF MS) typing data has not yet been explored. The aim of this study is to compare typing data from multiple centers employing bioinformatics using bacterial strains from two past outbreaks and non-related strains. MATERIAL/METHODS Participants received twelve extended spectrum betalactamase-producing E. coli isolates and followed the same standard operating procedure (SOP) including a full-protein extraction protocol. All laboratories provided visually read spectra via flexAnalysis (Bruker, Germany). Raw data from each laboratory allowed calculating the technical and biological reproducibility between centers using BioNumerics (Applied Maths NV, Belgium). RESULTS Technical and biological reproducibility ranged between 96.8-99.4% and 47.6-94.4%, respectively. The inter-center reproducibility showed a comparable clustering among identical isolates. Principal component analysis indicated a higher tendency to cluster within the same center. Therefore, we used a discriminant analysis, which completely separated the clusters. Next, we defined a reference center and performed a statistical analysis to identify specific peaks to identify the outbreak clusters. Finally, we used a classifier algorithm and a linear support vector machine on the determined peaks as classifier. A validation showed that within the set of the reference center, the identification of the cluster was 100% correct with a large contrast between the score with the correct cluster and the next best scoring cluster. CONCLUSIONS Based on the sufficient technical and biological reproducibility of MALDI-TOF MS based spectra, detection of specific clusters is possible from spectra obtained from different centers. However, we believe that a shared SOP and a bioinformatics approach are required to make the analysis robust and reliable.
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Rahi P, Prakash O, Shouche YS. Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass-Spectrometry (MALDI-TOF MS) Based Microbial Identifications: Challenges and Scopes for Microbial Ecologists. Front Microbiol 2016; 7:1359. [PMID: 27625644 PMCID: PMC5003876 DOI: 10.3389/fmicb.2016.01359] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 08/17/2016] [Indexed: 12/29/2022] Open
Abstract
Matrix-assisted laser desorption/ionization time-of-flight mass-spectrometry (MALDI-TOF MS) based biotyping is an emerging technique for high-throughput and rapid microbial identification. Due to its relatively higher accuracy, comprehensive database of clinically important microorganisms and low-cost compared to other microbial identification methods, MALDI-TOF MS has started replacing existing practices prevalent in clinical diagnosis. However, applicability of MALDI-TOF MS in the area of microbial ecology research is still limited mainly due to the lack of data on non-clinical microorganisms. Intense research activities on cultivation of microbial diversity by conventional as well as by innovative and high-throughput methods has substantially increased the number of microbial species known today. This important area of research is in urgent need of rapid and reliable method(s) for characterization and de-replication of microorganisms from various ecosystems. MALDI-TOF MS based characterization, in our opinion, appears to be the most suitable technique for such studies. Reliability of MALDI-TOF MS based identification method depends mainly on accuracy and width of reference databases, which need continuous expansion and improvement. In this review, we propose a common strategy to generate MALDI-TOF MS spectral database and advocated its sharing, and also discuss the role of MALDI-TOF MS based high-throughput microbial identification in microbial ecology studies.
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Affiliation(s)
- Praveen Rahi
- Microbial Culture Collection, National Centre for Cell Science Pune, India
| | - Om Prakash
- Microbial Culture Collection, National Centre for Cell Science Pune, India
| | - Yogesh S Shouche
- Microbial Culture Collection, National Centre for Cell Science Pune, India
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Fiedoruk K, Daniluk T, Fiodor A, Drewicka E, Buczynska K, Leszczynska K, Bideshi DK, Swiecicka I. MALDI-TOF MS portrait of emetic and non-emetic Bacillus cereus group members. Electrophoresis 2016; 37:2235-47. [PMID: 27196540 DOI: 10.1002/elps.201500308] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 04/25/2016] [Accepted: 05/09/2016] [Indexed: 11/09/2022]
Abstract
The number of foodborne intoxications caused by emetic Bacillus cereus isolates has increased significantly. As such, rapid and reliable methods to identify emetic strains appear to be clinically relevant. In this study, intact cell matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to differentiate emetic and non-emetic bacilli. The phyloproteomic clustering of 34 B. cereus emetic and 88 non-emetic isolates classified as B. cereus, Bacillus thuringiensis, Bacillus weihenstephanensis, and Bacillus mycoides, showed (i) a clear separation of both groups at a similarity level of 43%, and (ii) a high relatedness among the emetic isolates (similarity of 78%). Specifically, 83 mass peak classes were recognized in the spectral window range between m/z 4000 and 12 000 that were tentatively assigned to 41 protein variants based on a bioinformatic approach. Mass variation between the emetic and the non-emetic subsets was recorded for 27 of them, including ten ribosomal subunit proteins, for which inter-strain polymorphism was confirmed by gene sequencing. Additional peaks were assigned to other proteins such as small acid soluble proteins, cold shock proteins and hypothetical proteins, e.g., carbohydrate kinase. Moreover, the results were supported by in silico analysis of the biomarkers in 259 members of B. cereus group, including Bacillus anthracis, based on their whole-genome sequences. In conclusion, the proteomic profiling by MALDI-TOF MS is a promising and rapid method for pre-screening B. cereus to identify medically relevant isolates and for epidemiologic purposes.
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Affiliation(s)
- Krzysztof Fiedoruk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Tamara Daniluk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Angelika Fiodor
- Department of Microbiology, University of Bialystok, Bialystok, Poland
| | - Ewa Drewicka
- Department of Microbiology, University of Bialystok, Bialystok, Poland
| | | | | | - Dennis Ken Bideshi
- Department of Natural and Mathematical Science, California Baptist University, Riverside, USA.,Department of Entomology, University of California, Riverside, USA
| | - Izabela Swiecicka
- Department of Microbiology, University of Bialystok, Bialystok, Poland.,Laboratory of Applied Microbiology, University of Bialystok, Bialystok, Poland
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Identification and Pathogenic Potential of Clinical Bacillus and Paenibacillus Isolates. PLoS One 2016; 11:e0152831. [PMID: 27031639 PMCID: PMC4816569 DOI: 10.1371/journal.pone.0152831] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 03/02/2016] [Indexed: 11/21/2022] Open
Abstract
The soil-related Bacillus and Paenibacillus species have increasingly been implicated in various human diseases. Nevertheless, their identification still poses problems in the clinical microbiology laboratory and, with the exception of Bacillus anthracis and Bacillus cereus, little is known on their pathogenicity for humans. In this study, we evaluated the use of matrix-assisted laser desorption—ionization time of flight mass spectrometry (MALDI-TOF MS) in the identification of clinical isolates of these genera and conducted genotypic and phenotypic analyses to highlight specific virulence properties. Seventy-five clinical isolates were subjected to biochemical and MALDI-TOF MS identification. 16S rDNA sequencing and supplemental tests were used to solve any discrepancies or failures in the identification results. MALDI-TOF MS significantly outperformed classical biochemical testing for correct species identification and no misidentification was obtained. One third of the collected strains belonged to the B. cereus species, but also Bacillus pumilus and Bacillus subtilis were isolated at high rate. Antimicrobial susceptibility testing showed that all the B. cereus, B. licheniformis, B. simplex, B. mycoides, Paenibacillus glucanolyticus and Paenibacillus lautus isolates are resistant to penicillin. The evaluation of toxin/enzyme secretion, toxin-encoding genes, motility, and biofilm formation revealed that B. cereus displays the highest virulence potential. However, although generally considered nonpathogenic, most of the other species were shown to swim, swarm, produce biofilms, and secrete proteases that can have a role in bacterial virulence. In conclusion, MALDI-TOF MS appears useful for fast and accurate identification of Bacillus and Paenibacillus strains whose virulence properties make them of increasing clinical relevance.
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26
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Bacillus cereus Bacteremia and Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. INFECTIOUS DISEASES IN CLINICAL PRACTICE 2016. [DOI: 10.1097/ipc.0000000000000335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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Identification of Bacillus strains by MALDI TOF MS using geometric approach. Sci Rep 2015; 5:16989. [PMID: 26592761 PMCID: PMC4655313 DOI: 10.1038/srep16989] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 10/22/2015] [Indexed: 11/08/2022] Open
Abstract
Microorganism identification by MALDI TOF mass-spectrometry is based on the comparison of the mass spectrum of the studied organism with those of reference strains. It is a rapid and reliable method. However, commercial databases and programs are mostly designed for identification of clinically important strains and can be used only for particular mass spectrometer models. The need for open platforms and reference databases is obvious. In this study we describe a geometric approach for microorganism identification by mass spectra and demonstrate its capabilities by analyzing 24 strains belonging to the Bacillus pumilus group. This method is based on representing mass spectra as points on a multidimensional space, which allows us to use geometric distances to compare the spectra. Delimitation of microorganisms performed by geometric approach correlates well with the results of molecular phylogenetic analysis and clustering using Biotyper 3.1. All three methods used allowed us to reliably divide the strains into two groups corresponding to closely related species, Bacillus pumilus and Bacillus altitudinis. The method developed by us will be implemented in a Web interface designed for using open reference databases for microorganism identification. The data is available at http://www.bionet.nsc.ru/mbl/database/database.html.
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Caamaño-Antelo S, Fernández-No I, Böhme K, Ezzat-Alnakip M, Quintela-Baluja M, Barros-Velázquez J, Calo-Mata P. Genetic discrimination of foodborne pathogenic and spoilage Bacillus spp. based on three housekeeping genes. Food Microbiol 2015; 46:288-298. [DOI: 10.1016/j.fm.2014.08.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 08/17/2014] [Indexed: 11/28/2022]
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29
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Santos T, Capelo JL, Santos HM, Oliveira I, Marinho C, Gonçalves A, Araújo JE, Poeta P, Igrejas G. Use of MALDI-TOF mass spectrometry fingerprinting to characterize Enterococcus spp. and Escherichia coli isolates. J Proteomics 2015; 127:321-31. [PMID: 25753124 DOI: 10.1016/j.jprot.2015.02.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/20/2015] [Accepted: 02/24/2015] [Indexed: 02/06/2023]
Abstract
UNLABELLED Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a faster and more accurate method to identify intact bacteria than conventional microbiology and/or molecular biology methods. The MALDI-TOF MS method is potentially applicable in diagnostic laboratories to characterize commensal bacterial species, some of which are major pathogens, from human or animal gastrointestinal tracts. The aim of this study was to analyze at the cluster and statistical level the capacity of MALDI-TOF MS to distinguish between previously characterized enterococci and Escherichia coli isolated from wild birds of the Azores archipelago. Soluble proteins were extracted from intact cell cultures of 60 isolates of Enterococcus spp. and 60 isolates of E. coli by an expedient method. MALDI-TOF MS was used to obtain 1200 mass spectra that were statistically analyzed and compared. A total of 215 distinct mass-to-charge (m/z) peaks were obtained, including a peak at m/z 4428±3, which is exclusively found in spectra from Enterococcus isolates, and peaks at m/z 5379±3 and m/z 6253±3, which are only detected in spectra from E. coli isolates. By processing mass spectra and analyzing them statistically with MassUp software, including principal component analysis (PCA) and clustering, it was possible to correctly distinguish between isolates of Enterococcus and Escherichia genera. The results of the proteomic analysis confirm that these tools could be used to characterize whole bacterial cells. In the future, with an optimized protocol for obtaining plasmid-associated proteins and the further development of bioinformatics methods, it is likely that mass peak characteristic of antimicrobial resistance will be detected, increasing the potential usefulness of MALDI-TOF in routine clinical assays. BIOLOGICAL SIGNIFICANCE This study highlights the importance of MALDI-TOF MS in the rapid and reliable identification of bacteria by whole-cell analysis. The mass spectrometry approach performed in this study further contributes for the microbial biomarker discovery culminating in a preferable bacteria identification and antimicrobial resistance tool for the future of clinical microbiology. This article is part of a Special Issue entitled: HUPO 2014.
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Affiliation(s)
- Tiago Santos
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - José Luis Capelo
- Bioscope Group, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal; REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal
| | - Hugo M Santos
- Bioscope Group, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal; REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal
| | - Irene Oliveira
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Catarina Marinho
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Alexandre Gonçalves
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - José Eduardo Araújo
- Bioscope Group, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal; REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal
| | - Patrícia Poeta
- Centre of Studies of Animal and Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Gilberto Igrejas
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal.
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Branquinho R, Sousa C, Lopes J, Pintado ME, Peixe LV, Osório H. Differentiation of Bacillus pumilus and Bacillus safensis using MALDI-TOF-MS. PLoS One 2014; 9:e110127. [PMID: 25314655 PMCID: PMC4196992 DOI: 10.1371/journal.pone.0110127] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/17/2014] [Indexed: 11/29/2022] Open
Abstract
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) despite being increasingly used as a method for microbial identification, still present limitations in which concerns the differentiation of closely related species. Bacillus pumillus and Bacillus safensis, are species of biotechnological and pharmaceutical significance, difficult to differentiate by conventional methodologies. In this study, using a well-characterized collection of B. pumillus and B. safensis isolates, we demonstrated the suitability of MALDI-TOF-MS combined with chemometrics to accurately and rapidly identify them. Moreover, characteristic species-specific ion masses were tentatively assigned, using UniProtKB/Swiss-Prot and UniProtKB/TrEMBL databases and primary literature. Delineation of B. pumilus (ions at m/z 5271 and 6122) and B. safensis (ions at m/z 5288, 5568 and 6413) species were supported by a congruent characteristic protein pattern. Moreover, using a chemometric approach, the score plot created by partial least square discriminant analysis (PLSDA) of mass spectra demonstrated the presence of two individualized clusters, each one enclosing isolates belonging to a species-specific spectral group. The generated pool of species-specific proteins comprised mostly ribosomal and SASPs proteins. Therefore, in B. pumilus the specific ion at m/z 5271 was associated with a small acid-soluble spore protein (SASP O) or with 50S protein L35, whereas in B. safensis specific ions at m/z 5288 and 5568 were associated with SASP J and P, respectively, and an ion at m/z 6413 with 50S protein L32. Thus, the resulting unique protein profile combined with chemometric analysis, proved to be valuable tools for B. pumilus and B. safensis discrimination, allowing their reliable, reproducible and rapid identification.
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Affiliation(s)
- Raquel Branquinho
- REQUIMTE, Laboratório de Microbiologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Clara Sousa
- REQUIMTE, Laboratório de Microbiologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
- CEB, Centro de Engenharia Biológica, Universidade do Minho, Braga, Portugal
| | - João Lopes
- REQUIMTE, Laboratório de Química Aplicada, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
- CBQF, Centro de Biotecnologia e Química Fina, Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Porto, Portugal
| | - Manuela E. Pintado
- Departmento de Tecnologia Farmacêutica, Faculdade Farmácia, Universidade de Lisboa, Lisboa, Portugal
| | - Luísa V. Peixe
- REQUIMTE, Laboratório de Microbiologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Hugo Osório
- IPATIMUP, Instituto de Patologia e Imunologia Molecular da Universidade do Porto, Porto, Portugal
- Faculdade de Medicina, Universidade do Porto, Porto, Portugal
- * E-mail:
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31
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Burgess SA, Flint SH, Lindsay D. Characterization of thermophilic bacilli from a milk powder processing plant. J Appl Microbiol 2013; 116:350-9. [PMID: 24119100 DOI: 10.1111/jam.12366] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 09/18/2013] [Accepted: 10/08/2013] [Indexed: 11/29/2022]
Abstract
AIMS To determine whether strains of Geobacillus stearothermophilus isolated from a milk powder manufacturing plant were different in their ability to form biofilms and produce spores. In addition, this study evaluated whether there were other physiological characteristics that could differentiate these strains. METHODS AND RESULTS Ten G. stearothermophilus strains and one Anoxybacillus species were isolated from a milk powder manufacturing plant. A microtitre plate assay was used to show that these strains differed in their abilities to form biofilms and produce spores. Scanning electron microscopy showed differences in the biofilm morphologies of three of the G. stearothermophilus strains. Biochemical profiling, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and fatty acid profiling further showed that they had distinct characteristics. CONCLUSIONS These G. stearothermophilus strains, isolated from the same environment, showed differences in their ability to form biofilms and produce endospores. Based on the multiple characterization methods used in this study, these strains of G. stearothermophilus isolated from one manufacturing plant are diverse. SIGNIFICANCE AND IMPACT OF THE STUDY Differences in the ability of G. stearothermophilus to form biofilms and produce spores may influence the cleaning method used to control the growth of thermophilic bacilli in a dairy processing environment.
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Affiliation(s)
- S A Burgess
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand.,Fonterra Research and Development Centre, Palmerston North, New Zealand
| | - S H Flint
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - D Lindsay
- Fonterra Research and Development Centre, Palmerston North, New Zealand
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