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Liu YQ, Wang ZW, Hu CY. Progress in research on the safety of silicone rubber products in food processing. Compr Rev Food Sci Food Saf 2023; 22:2887-2909. [PMID: 37183940 DOI: 10.1111/1541-4337.13165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 03/24/2023] [Accepted: 04/15/2023] [Indexed: 05/16/2023]
Abstract
Silicone rubber (SR) is widely used in the food processing industry due to its excellent physical and chemical properties. However, due to the differences in SR product production formulas and processes, the quality of commercially available SR products varies greatly, with chemical and biological hazard potentials. Residual chemicals in SR, such as siloxane oligomers and 2,4-dichlorobenzoic acid, are non-intentionally added substances, which may migrate into food during processing so the safe use of SR must be guaranteed. Simultaneously, SR in contact with food is susceptible to pathogenic bacteria growing and biofilm formation, like Cronobacter sakazakii, Staphylococcus aureus, Salmonella enteritidis, and Listeria monocytogenes, posing a food safety risk. Under severe usage scenarios such as high-temperature, high-pressure, microwave, and freezing environments with long-term use, SR products are more prone to aging, and their degradation products may pose potential food safety hazards. Based on the goal of ensuring food quality and safety to the greatest extent possible, this review suggests that enterprises need to prepare high-quality food-contact SR products by optimizing the manufacturing formula and production process, and developing products with antibacterial and antiaging properties. The government departments should establish quality standards for food-contact SR products and conduct effective supervision. Besides, the reusable SR products should be cleaned by consumers immediately after use, and the deteriorated products should be replaced as soon as possible.
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Affiliation(s)
- Yi-Qi Liu
- Department of Food Science & Engineering, Jinan University, Guangzhou, Guangdong, China
| | - Zhi-Wei Wang
- Packaging Engineering Institute, Jinan University, Zhuhai, Guangdong, China
| | - Chang-Ying Hu
- Department of Food Science & Engineering, Jinan University, Guangzhou, Guangdong, China
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Abd-Ellatif S, Ibrahim AA, Safhi FA, Abdel Razik ES, Kabeil SSA, Aloufi S, Alyamani AA, Basuoni MM, ALshamrani SM, Elshafie HS. Green Synthesized of Thymus vulgaris Chitosan Nanoparticles Induce Relative WRKY-Genes Expression in Solanum lycopersicum against Fusarium solani, the Causal Agent of Root Rot Disease. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11223129. [PMID: 36432858 PMCID: PMC9695361 DOI: 10.3390/plants11223129] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/08/2022] [Accepted: 11/09/2022] [Indexed: 05/30/2023]
Abstract
Fusarium solani is a plant pathogenic fungus that causes tomato root rot disease and yield losses in tomato production. The current study's main goal is testing the antibacterial efficacy of chitosan nanoparticles loaded with Thyme vulgaris essential oil (ThE-CsNPs) against F. solani in vitro and in vivo. GC-MS analysis was used to determine the chemical constituents of thyme EO. ThE-CsNPs were investigated using transmission electron microscopy before being physicochemically characterized using FT-IR. ThE-CsNPs were tested for antifungal activity against F. solani mycelial growth in vitro. A pot trial was conducted to determine the most effective dose of ThE-CsNPs on the morph/physiological characteristics of Solanum lycopersicum, as well as the severity of fusarium root rot. The relative gene expression of WRKY transcript factors and defense-associated genes were quantified in root tissues under all treatment conditions. In vitro results revealed that ThE-CsNPs (1%) had potent antifungal efficacy against F. solani radial mycelium growth. The expression of three WRKY transcription factors and three tomato defense-related genes was upregulated. Total phenolic, flavonoid content, and antioxidant enzyme activity were all increased. The outfindings of this study strongly suggested the use of ThE-CsNPs in controlling fusarium root rot on tomatoes; however, other experiments remain necessary before they are recommended.
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Affiliation(s)
- Sawsan Abd-Ellatif
- Bioprocess Development Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technology Applications, Alexandria 21934, Egypt
| | - Amira A. Ibrahim
- Botany and Microbiology Department, Faculty of Science, Arish University, Al-Arish 45511, Egypt
| | - Fatmah A. Safhi
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
| | - Elsayed S. Abdel Razik
- Plant Protection and Biomolecular Diagnosis Department, Arid Lands Cultivation Research Institute, City of Scientific Research and Technology Applications, Alexandria 21934, Egypt
| | - Sanaa S. A. Kabeil
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technology Applications, Alexandria 21934, Egypt
| | - Salman Aloufi
- Department of Biotechnology, Faculty of Sciences, Taif University, Taif 21944, Saudi Arabia
| | - Amal A. Alyamani
- Department of Biotechnology, Faculty of Sciences, Taif University, Taif 21944, Saudi Arabia
| | - Mostafa M. Basuoni
- Botany and Microbiology Department, Faculty of Science (Boys), Al-Azhar University, Cairo 11884, Egypt
| | | | - Hazem S. Elshafie
- School of Agricultural, Forestry, Food and Environmental Sciences (SAFE), University of Basilicata, 85100 Potenza, Italy
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Meireles Mafaldo Í, Priscila Barros de Medeiros V, Karoline Almeida da Costa W, Francisca da Costa Sassi C, da Costa Lima M, Leite de Souza E, Eduardo Barão C, Colombo Pimentel T, Magnani M. Survival during long-term storage, membrane integrity, and ultrastructural aspects of Lactobacillus acidophilus 05 and Lacticaseibacillus casei 01 freeze-dried with freshwater microalgae biomasses. Food Res Int 2022; 159:111620. [DOI: 10.1016/j.foodres.2022.111620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 06/07/2022] [Accepted: 07/01/2022] [Indexed: 12/30/2022]
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Antimicrobial effects of thymol-loaded phytoglycogen/zein nanocomplexes against foodborne pathogens on fresh produce. Int J Biol Macromol 2022; 209:1188-1196. [PMID: 35452703 DOI: 10.1016/j.ijbiomac.2022.04.101] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/13/2022] [Accepted: 04/14/2022] [Indexed: 11/23/2022]
Abstract
In this study, thymol-loaded hydrophobically modified phytoglycogen/zein nanocomplexes with a particle size around 100 nm were developed for improving microbial safety of fresh produce. The antimicrobial activities, including the determination of minimum inhibitory and bactericidal concentration, growth kinetic curves, and inhibition zone of the nanocomplexes against foodborne pathogens (Listeria monocytogenes, Salmonella enteritidis, and Escherichia coli) were evaluated. The results showed that the antimicrobial activities of the nanocomplexes were significantly stronger than that of free thymol control (without encapsulation), and the antimicrobial efficacy remained unchanged after storage at 4 °C for 60 days. The morphological results from atomic force microscope revealed that small micellar blebs were formed at the surface of bacteria after treatment with nanocomplexes and the gradual disappearance of the cell boundary indicated the occurrence of cytolysis. The potential applications of this nanocomplex as disinfectant agent in wash water were evaluated on different types of fresh produce (lettuce, cantaloupe, and strawberries). Notably, the nanocomplexes also demonstrated efficacy in biofilm removal. Findings from this study clearly demonstrated that the thymol-loaded nanocomplexes hold promising potential for the disinfection of fresh produce to improve their microbial safety and quality.
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Thymus vulgaris Essential Oil and Its Biological Activity. PLANTS 2021; 10:plants10091959. [PMID: 34579491 PMCID: PMC8467294 DOI: 10.3390/plants10091959] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/16/2021] [Accepted: 09/17/2021] [Indexed: 11/17/2022]
Abstract
Thymus vulgaris essential oil has potential good biological activity. The aim of the research was to evaluate the biological activity of the T. vulgaris essential oil from the Slovak company. The main components of T. vulgaris essential oil were thymol (48.1%), p-cymene (11.7%), 1,8-cineole (6.7), γ-terpinene (6.1%), and carvacrol (5.5%). The antioxidant activity was 85.2 ± 0.2%, which corresponds to 479.34 ± 1.1 TEAC. The antimicrobial activity was moderate or very strong with inhibition zones from 9.89 to 22.44 mm. The lowest values of MIC were determined against B. subtilis, E. faecalis, and S. aureus. In situ antifungal analysis on bread shows that the vapor phase of T. vulgaris essential oil can inhibit the growth of the microscopic filamentous fungi of the genus Penicillium. The antimicrobial activity against S. marcescens showed 46.78-87.80% inhibition at concentrations 62.5-500 µL/mL. The MALDI TOF MS analyses suggest changes in the protein profile of biofilm forming bacteria P. fluorescens and S. enteritidis after the fifth and the ninth day, respectively. Due to the properties of the T. vulgaris essential oil, it can be used in the food industry as a natural supplement to extend the shelf life of the foods.
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Torres Dominguez E, Nguyen PH, Hunt HK, Mustapha A. Antimicrobial Coatings for Food Contact Surfaces: Legal Framework, Mechanical Properties, and Potential Applications. Compr Rev Food Sci Food Saf 2019; 18:1825-1858. [PMID: 33336965 DOI: 10.1111/1541-4337.12502] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 07/20/2019] [Accepted: 08/29/2019] [Indexed: 01/09/2023]
Abstract
Food contact surfaces (FCS) in food processing facilities may become contaminated with a number of unwanted microorganisms, such as Listeria monocytogenes, Escherichia coli O157:H7, and Staphylococcus aureus. To reduce contamination and the spread of disease, these surfaces may be treated with sanitizers or have active antimicrobial components adhered to them. Although significant efforts have been devoted to the development of coatings that improve the antimicrobial effectiveness of FCS, other important coating considerations, such as hardness, adhesion to a substrate, and migration of the antimicrobial substance into the food matrix, have largely been disregarded to the detriment of their translation into practical application. To address this gap, this review examines the mechanical properties of antimicrobial coatings (AMC) applied to FCS and their interplay with their antimicrobial properties within the framework of relevant regulatory constraints that would apply if these were used in real-world applications. This review also explores the various assessment techniques for examining these properties, the effects of the deposition methods on coating properties, and the potential applications of such coatings for FCS. Overall, this review attempts to provide a holistic perspective. Evaluation of the current literature urges a compromise between antimicrobial effectiveness and mechanical stability in order to adhere to various regulatory frameworks as the next step toward improving the industrial feasibility of AMC for FCS applications.
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Affiliation(s)
- Eduardo Torres Dominguez
- Dept. of Biomedical, Biological & Chemical Engineering, Univ. of Missouri, Columbia, MO, 65211, U.S.A
| | - Phong H Nguyen
- Dept. of Biomedical, Biological & Chemical Engineering, Univ. of Missouri, Columbia, MO, 65211, U.S.A
| | - Heather K Hunt
- Dept. of Biomedical, Biological & Chemical Engineering, Univ. of Missouri, Columbia, MO, 65211, U.S.A
| | - Azlin Mustapha
- Food Science Program, Univ. of Missouri, Columbia, MO, 65211, U.S.A
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Lira MC, Rodrigues JB, Almeida ETC, Ritter AC, Tondo E, Torres SM, Schaffner D, de Souza EL, Magnani M. Efficacy of oregano and rosemary essential oils to affect morphology and membrane functions of noncultivable sessile cells of Salmonella Enteritidis 86 in biofilms formed on stainless steel. J Appl Microbiol 2019; 128:376-386. [PMID: 31448524 DOI: 10.1111/jam.14423] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 08/05/2019] [Accepted: 08/17/2019] [Indexed: 01/06/2023]
Abstract
AIMS This study evaluated the efficacy of essential oil from Origanum vulgare L. (oregano; OVEO) and Rosmarinus officinalis L. (rosemary; ROEO) to inactivate sessile cells of Salmonella enterica serovar Enteritidis 86 (SE86) in young and mature biofilms formed on stainless steel. METHODS AND RESULTS Ultrastructural alterations and damage in different physiological functions caused by OVEO and ROEO in noncultivable sessile cells of SE86 were investigated using scanning electron microscopy and flow cytometry. OVEO (2·5 μl ml-1 ) and ROEO (40 μl ml-1 ) were effective to eradicate young and mature biofilms formed by SE86 sessile cells on stainless steel surfaces; however, the efficacy varied with exposure time. OVEO and ROEO caused alterations in morphology of SE86 sessile cells, inducing the occurrence of bubbles or spots on cell surface. OVEO and ROEO compromised membrane polarization, permeability and efflux activity in noncultivable SE86 sessile cells. These findings show that OVEO and ROEO act by a multitarget mechanism on SE86 membrane functions. CONCLUSIONS ROEO and OVEO showed efficacy to eradicate SE86 sessile cells in preformed biofilms on stainless steel, displaying a time-dependent effect and multitarget action mode on bacterial cell membrane. SIGNIFICANCE AND IMPACT OF THE STUDY The study provides for the first time the effects of OVEO and ROEO on morphology and physiological functions of noncultivable sessile cells of S. Enteritidis biofilms preformed on stainless steel surfaces.
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Affiliation(s)
- M C Lira
- Department of Nutrition, Health Sciences Center, Laboratory of Food Microbiology, Federal University of Paraíba, João Pessoa, Brazil
| | - J B Rodrigues
- Department of Food Engineering, Center of Technology, Laboratory of Microbial Process in Foods, Federal University of Paraíba, João Pessoa, Brazil
| | - E T C Almeida
- Department of Nutrition, Health Sciences Center, Laboratory of Food Microbiology, Federal University of Paraíba, João Pessoa, Brazil
| | - A C Ritter
- Laboratory of Food Microbiology, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - E Tondo
- Laboratory of Food Microbiology, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - S M Torres
- Department of Materials Engineering, Center of Technology, Federal University of Paraíba, João Pessoa, Brazil
| | - D Schaffner
- Department of Food Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - E L de Souza
- Department of Nutrition, Health Sciences Center, Laboratory of Food Microbiology, Federal University of Paraíba, João Pessoa, Brazil
| | - M Magnani
- Department of Food Engineering, Center of Technology, Laboratory of Microbial Process in Foods, Federal University of Paraíba, João Pessoa, Brazil
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Liang R, Li J, Liu M, Huang ZY. Influence of inhibitors on the adhesion of SRB to the stainless steel in circulating cooling water. Colloids Surf B Biointerfaces 2018; 172:1-9. [PMID: 30114603 DOI: 10.1016/j.colsurfb.2018.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 08/03/2018] [Accepted: 08/09/2018] [Indexed: 10/28/2022]
Abstract
Influence of the surface characteristics of three stainless steels (SS304, 316L and 317) and presence of scale inhibitors on adhesion kinetics of sulfate reducing bacteria (SRB) in circulating cooling water, were investigated by evaluating surface free energy, adhesion kinetic constants in a parallel plate flow chamber. Results show that the surface free energy values of SS317, SS316L and SS304 are -31.69, -24.18 and -13.92 mJ m-2, respectively. SS317 surface had higher surface hydrophobicity than SS316L and SS304. In the process of bacteria cells adhesion onto SS surfaces, electrostatic interaction for SS is slightly more than hydrophobic interaction. The number of adhering bacteria and the adhesion kinetic constants are different on the three types of stainless steel. The adhesion kinetic constants for SS317 and 316L are greater than that for SS304, which are 0.0354, 0.0282 and 0.0190 min-1, respectively. Scale inhibitors of hydrosy ethyl fork phosphonic acid (HEDP) and phosphono butane-1, 2, 4-tricarboxylic acid (PBTCA) have a certain influence on the initial adhesion of bacteria cell and adhesion kinetics constants are reduced in the presence of HEDP and PBTCA.
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Affiliation(s)
- R Liang
- Department of Municipal and Environmental Engineering, Research Center for Aqueous Organic Pollutants Control and Water Quality Security, Beijing Jiaotong University, Haidian District, Beijing, 100044, China
| | - J Li
- Department of Municipal and Environmental Engineering, Research Center for Aqueous Organic Pollutants Control and Water Quality Security, Beijing Jiaotong University, Haidian District, Beijing, 100044, China.
| | - M Liu
- Department of Municipal and Environmental Engineering, Research Center for Aqueous Organic Pollutants Control and Water Quality Security, Beijing Jiaotong University, Haidian District, Beijing, 100044, China
| | - Z Y Huang
- Department of Municipal and Environmental Engineering, Research Center for Aqueous Organic Pollutants Control and Water Quality Security, Beijing Jiaotong University, Haidian District, Beijing, 100044, China
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Borges KA, Furian TQ, Souza SN, Menezes R, Tondo EC, Salle CT, Moraes HL, Nascimento VP. Biofilm formation capacity of Salmonella serotypes at different temperature conditions. PESQUISA VETERINARIA BRASILEIRA 2018. [DOI: 10.1590/1678-5150-pvb-4928] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
ABSTRACT: Salmonella spp. are one of the most important agents of foodborne disease in several countries, including Brazil. Poultry-derived products are the most common food products, including meat and eggs, involved in outbreaks of human salmonellosis. Salmonella has the capacity to form biofilms on both biotic and abiotic surfaces. The biofilm formation process depends on an interaction among bacterial cells, the attachment surface and environmental conditions. These structures favor bacterial survival in hostile environments, such as slaughterhouses and food processing plants. Biofilms are also a major problem for public health because breakage of these structures can cause the release of pathogenic microorganisms and, consequently, product contamination. The aim of this study was to determine the biofilm production capacity of Salmonella serotypes at four different temperatures of incubation. Salmonella strains belonging to 11 different serotypes, isolated from poultry or from food involved in salmonellosis outbreaks, were selected for this study. Biofilm formation was investigated under different temperature conditions (37°, 28°, 12° and 3°C) using a microtiter plate assay. The tested temperatures are important for the Salmonella life cycle and to the poultry-products process. A total of 92.2% of the analyzed strains were able to produce biofilm on at least one of the tested temperatures. In the testing, 71.6% of the strains produced biofilm at 37°C, 63% at 28°C, 52.3% at 12°C and 39.5% at 3°C, regardless of the serotype. The results indicate that there is a strong influence of temperature on biofilm production, especially for some serotypes, such as S. Enteritidis, S. Hadar and S. Heidelberg. The production of these structures is partially associated with serotype. There were also significant differences within strains of the same serotype, indicating that biofilm production capacity may be strain-dependent.
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Borges KA, Furian TQ, de Souza SN, Menezes R, Salle CTP, de Souza Moraes HL, Tondo EC, do Nascimento VP. Phenotypic and Molecular Characterization of Salmonella Enteritidis SE86 Isolated from Poultry and Salmonellosis Outbreaks. Foodborne Pathog Dis 2017; 14:742-754. [PMID: 29106298 DOI: 10.1089/fpd.2017.2327] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Salmonella Enteritidis remains a standout among the leading causes of foodborne diseases worldwide. Previous studies have demonstrated that a unique clonal group of Salmonella Enteritidis, named SE86, is involved in foodborne outbreaks in southern Brazil and is frequently identified among strains isolated from poultry. The aim of this study was to determine the influence of the isolation source (food products involved in salmonellosis outbreaks and poultry sources) on the phenotypic and molecular characteristics of Salmonella Enteritidis SE86. A biofilm formation assay, antimicrobial susceptibility test, polymerase chain reaction identification of virulence-associated genes, and phage type 4 (PT4) assessment were performed to characterize Salmonella Enteritidis SE86. The human strains presented less antimicrobial resistance than the poultry strains. Resistance to some substances was related to the isolation source of the strain. Strains of the same clonal group presented different biofilm production abilities. Biofilm formation was independent of the isolation source at all temperatures. Temperature influenced biofilm formation only by the poultry strains. Most of the investigated genes presented a high frequency and a regular distribution, regardless of the isolation source. The spvB, spiA, pagC, sipB, prgH, spaN, sitC, and lpfC genes were associated with the avian strains, whereas iroN was associated with the strains isolated from food products involved in salmonellosis outbreaks. Most strains belonged to PT4. No relationship was found between biofilm production and antimicrobial resistance or between the virulence profile and biofilm production or antimicrobial resistance.
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Affiliation(s)
- Karen Apellanis Borges
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Thales Quedi Furian
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Sara Neves de Souza
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Rafaela Menezes
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Carlos Tadeu Pippi Salle
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Hamilton Luiz de Souza Moraes
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
| | - Eduardo César Tondo
- 2 Instituto de Ciência e Tecnologia dos Alimentos (ICTA) , Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Vladimir Pinheiro do Nascimento
- 1 Departamento de Medicina Animal, Faculdade de Veterinária, Centro de Diagnóstico e Pesquisa em Patologia Aviária (CDPA), Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, Brazil
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