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Sarkar D, Ratkowsky DA, Wang B, Bowman JP, Tamplin ML. Modelling viability of Listeria monocytogenes in paneer. Food Microbiol 2021; 97:103738. [PMID: 33653517 DOI: 10.1016/j.fm.2021.103738] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/27/2020] [Accepted: 01/07/2021] [Indexed: 02/02/2023]
Abstract
Paneer is a fresh, soft ready-to-eat cheese that is susceptible to Listeria monocytogenes contamination, exemplified by product recalls in Australia, Canada, and the USA. Previous research demonstrates that L. monocytogenes grows in paneer, however there are no paneer-specific predictive models that quantify the effect of environmental conditions on L. monocytogenes viability. This study measured the viability of a five-strain cocktail of L. monocytogenes in freshly prepared paneer incubated at 4-40 °C. Growth rates were fitted with the extended Ratkowsky square root model, with growth rates ranging from 0.014 to 0.352 log10 CFU/h. In comparison with published models, only the ComBase L. monocytogenes broth model acceptably predicted growth (Bf = 1.01, Af = 1.12) versus the developed model. The influence of paneer pH (5.0-6.0) and storage temperature (41-45 °C) on L. monocytogenes growth at the upper temperature growth boundary was described using a logistic model. These models provide quantitative tools to improve the safety of paneer processing conditions, shelf-life estimation, food safety management plans, and risk assessment.
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Affiliation(s)
- Dipon Sarkar
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
| | - David A Ratkowsky
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
| | - Bing Wang
- Department of Food Science and Technology, University of Nebraska-Lincoln, 1901 N 21st St, Lincoln, NE, 68588, United States.
| | - John P Bowman
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
| | - Mark L Tamplin
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
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dos Santos JLP, Silva BS, Furtado MM, Morassi LL, Vermeulen A, Sant’Ana AS. The application of growth-no growth models to directly assess the stability of wholemeal multigrain bread towards Penicillium paneum LMQA-002 and Paecilomyces variotii LMQA-001. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Santos JL, Samapundo S, Gülay SM, Van Impe J, Sant'Ana AS, Devlieghere F. Inter- and intra-species variability in heat resistance and the effect of heat treatment intensity on subsequent growth of Byssochlamys fulva and Byssochlamys nivea. Int J Food Microbiol 2018; 279:80-87. [DOI: 10.1016/j.ijfoodmicro.2018.04.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 04/09/2018] [Accepted: 04/19/2018] [Indexed: 01/08/2023]
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4
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Santos JL, Chaves RD, Sant’Ana AS. Estimation of growth parameters of six different fungal species for selection of strains to be used in challenge tests of bakery products. FOOD BIOSCI 2017. [DOI: 10.1016/j.fbio.2017.08.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zhang X, Li J, Wang D, Feng S, Ma L. The effect of dipping pretreatment on ochratoxin A accumulation in sultanas and currants. Food Sci Biotechnol 2016; 25:929-934. [PMID: 30263356 PMCID: PMC6049166 DOI: 10.1007/s10068-016-0152-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 02/06/2016] [Accepted: 02/13/2016] [Indexed: 11/24/2022] Open
Abstract
The dipping pretreatment on the occurrence of ochratoxin A (OTA) in sultanas and currants was investigated. Grape samples were divided into two groups before a drying process. One group was dipped with potassium carbonate-ethyl oleate, and the other group was left without treatment (the control). OTA were detected using solid-phase extraction clean-up and a high-performance liquid chromatography fluorescence detector. Results showed that OTA content was below the limit of detection in the fresh grapes of both varieties. OTA were not detected in dried vine fruits before storage. However, a real naturally environmental storage revealed that the dipping pretreated samples were contaminated with OTA earlier and to a greater extent than the control. The OTA concentration in the treated and control samples after one-year storage was 0.22 and 0.19 μg/kg for sultanas and 0.34 and 0.21 μg/kg for currants, respectively. These results indicated that dipping pretreatment might increase the toxin contamination and safety risk.
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Affiliation(s)
- Xiaoxu Zhang
- Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China
| | - Jingming Li
- Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China
| | - Dong Wang
- Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China
| | - Saisai Feng
- Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China
| | - Liyan Ma
- Supervision, Inspection & Testing Center of Agricultural Products Quality, Ministry of Agriculture, Beijing, 100083 China
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Kotzybik K, Gräf V, Kugler L, Stoll DA, Greiner R, Geisen R, Schmidt-Heydt M. Influence of Different Nanomaterials on Growth and Mycotoxin Production of Penicillium verrucosum. PLoS One 2016; 11:e0150855. [PMID: 26974550 PMCID: PMC4790900 DOI: 10.1371/journal.pone.0150855] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 02/19/2016] [Indexed: 01/17/2023] Open
Abstract
Nanoparticles are ubiquitous in the environment. They originate from anthropogenic or natural sources or they are intentionally produced for different purposes. There exist manifold applications of nanoparticles in modern life leading unavoidably to a confrontation and interaction between nanomaterial and living organisms. Based on their wide distribution tending to increase steadily, the influence of particles based on silica and silver, exhibiting nominal sizes between 0.65 nm and 200 nm, on the physiology of the mycotoxigenic filamentous fungus Penicillium verrucosum was analyzed. The applied concentration and time-point, the size and the chemical composition of the particles was shown to have a strong influence on growth and mycotoxin biosynthesis. On microscopic scale it could be shown that silver nanoparticles attach to the mycelial surface. Moreover, silver nanoparticles with 0.65 nm and 5 nm in size were shown to internalize within the cell, form agglomerates in the cytoplasm and associate to cell organelles.
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Affiliation(s)
- Kathrin Kotzybik
- Department of Safety and Quality of Fruits and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Volker Gräf
- Department of Food Technology and Bioprocess Engineering, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Lena Kugler
- Department of Safety and Quality of Fruits and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Dominic A. Stoll
- Department of Safety and Quality of Fruits and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Ralf Greiner
- Department of Food Technology and Bioprocess Engineering, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Rolf Geisen
- Department of Safety and Quality of Fruits and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Markus Schmidt-Heydt
- Department of Safety and Quality of Fruits and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
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Chiotta M, Sosa D, Ponsone M, Chulze S. Effect of water activity and temperature on growth of Aspergillus carbonarius and Aspergillus tubingensis and their interactions on ochratoxin A production. WORLD MYCOTOXIN J 2015. [DOI: 10.3920/wmj2013.1692] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Aspergillus section Nigri are described as the main source of ochratoxin A (OTA) contamination in grapes and wine worldwide. The grape-growing area in Argentina has a wide latitudinal extension with ecological variations that allow the classification of well-demarcated regions. The aims of this study were: to determine the effect of eco-physiological parameters on growth of Aspergillus tubingensis and Aspergillus carbonarius and to evaluate the interaction between these species on OTA production in synthetic grape juice medium under different water activity (aw) and temperature conditions. The results showed that optimal growth conditions for A. tubingensis and A. carbonarius were 0.980 aw and 28 °C, however A. tubingensis grew faster than A. carbonarius at all temperatures and aw tested. OTA production by A. carbonarius was favoured at 20 °C and 0.950-0.965 aw, during 14 days of incubation. The effect of A. tubingensis on OTA production by A. carbonarius was mainly dependent on temperature. At 35 °C, A. tubingensis reduced the OTA production while this effect was not observed at 20 °C. More OTA could be produced as a defence reaction against fungal competitors to maintain niche colonisation, but in this study no effects by a related species were observed.
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Affiliation(s)
- M.L. Chiotta
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
- Member of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
| | - D.M. Sosa
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
- Fellowship of CONICET, Argentina
| | - M.L. Ponsone
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
- Member of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
| | - S.N. Chulze
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
- Member of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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Garcia D, Ramos AJ, Sanchis V, Marín S. Growth parameters of Penicillium expansum calculated from mixed inocula as an alternative to account for intraspecies variability. Int J Food Microbiol 2014; 186:120-4. [PMID: 25033331 DOI: 10.1016/j.ijfoodmicro.2014.06.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 03/31/2014] [Accepted: 06/21/2014] [Indexed: 11/19/2022]
Abstract
The aim of this work was to compare the radial growth rate (μ) and the lag time (λ) for growth of 25 isolates of Penicillium expansum at 1 and 20 ºC with those of the mixed inoculum of the 25 isolates. Moreover, the evolution of probability of growth through time was also compared for the single strains and mixed inoculum. Working with a mixed inoculum would require less work, time and consumables than if a range of single strains has to be used in order to represent a given species. Suitable predictive models developed for a given species should represent as much as possible the behavior of all strains belonging to this species. The results suggested, on one hand, that the predictions based on growth parameters calculated on the basis of mixed inocula may not accurately predict the behavior of all possible strains but may represent a percentage of them, and the median/mean values of μ and λ obtained by the 25 strains may be substituted by the value obtained with the mixed inoculum. Moreover, the predictions may be biased, in particular, the predictions of λ which may be underestimated (fail-safe). Moreover, the prediction of time for a given probability of growth through a mixed inoculum may not be accurate for all single inocula, but it may represent 92% and 60% of them at 20 and 1 ºC, respectively, and also their overall mean and median values. In conclusion, mixed inoculum could be a good alternative to estimate the mean or median values of high number of isolates, but not to account for those strains with marginal behavior. In particular, estimation of radial growth rate, and time for 0.10 and 0.50 probability of growth using a cocktail inoculum accounted for the estimates of most single isolates tested. For the particular case of probability models, this is an interesting result as for practical applications in the food industry the estimation of t10 or lower probability may be required.
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Affiliation(s)
- Daiana Garcia
- Food Technology Department, Lleida University, XaRTA-TPV, Agrotecnio Center, Rovira Roure 191, 25198 Lleida, Spain
| | - Antonio J Ramos
- Food Technology Department, Lleida University, XaRTA-TPV, Agrotecnio Center, Rovira Roure 191, 25198 Lleida, Spain
| | - Vicente Sanchis
- Food Technology Department, Lleida University, XaRTA-TPV, Agrotecnio Center, Rovira Roure 191, 25198 Lleida, Spain
| | - Sonia Marín
- Food Technology Department, Lleida University, XaRTA-TPV, Agrotecnio Center, Rovira Roure 191, 25198 Lleida, Spain.
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García-Cela E, Gil-Serna J, Marín S, Acevedo H, Patiño B, Ramos A. Effect of preharvest anti-fungal compounds on Aspergillus steynii and A. carbonarius under fluctuating and extreme environmental conditions. Int J Food Microbiol 2012; 159:167-76. [DOI: 10.1016/j.ijfoodmicro.2012.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Revised: 07/06/2012] [Accepted: 08/01/2012] [Indexed: 10/28/2022]
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Garcia D, Ramos AJ, Sanchis V, Marín S. Intraspecific variability of growth and patulin production of 79 Penicillium expansum isolates at two temperatures. Int J Food Microbiol 2011; 151:195-200. [DOI: 10.1016/j.ijfoodmicro.2011.08.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 08/16/2011] [Accepted: 08/24/2011] [Indexed: 11/30/2022]
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11
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Is intraspecific variability of growth and mycotoxin production dependent on environmental conditions? A study with Aspergillus carbonarius isolates. Int J Food Microbiol 2011; 144:432-9. [DOI: 10.1016/j.ijfoodmicro.2010.10.030] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/21/2010] [Accepted: 10/24/2010] [Indexed: 11/23/2022]
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12
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Astoreca AL, Magnoli CE, Dalcero AM. Ecophysiology of Aspergillus section nigri species potential ochratoxin a producers. Toxins (Basel) 2010; 2:2593-605. [PMID: 22069566 PMCID: PMC3153178 DOI: 10.3390/toxins2112593] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 09/28/2010] [Accepted: 10/26/2010] [Indexed: 11/25/2022] Open
Abstract
After aflatoxins, ochratoxin A (OTA) is the most studied mycotoxin due to the toxicological significance in human and animal diets. OTA presence has been extensively reported worldwide in the last decade in several agricultural products. The main OTA producer in tropical and temperate climates is Aspergillus carbonarius followed by species belonging to A. niger aggregate. Currently, many scientists worldwide have studied the influence of water activity and temperature for growth and biosynthesis of OTA by these species on synthetic media. This article reviews ecophysiological studies of Aspergillus section Nigri strains on synthetic media and natural substrates. The results of these investigations suggest that significant amounts of OTA can be produced in only five days and that the use of different storage practices, such as a(W) and temperature levels below 0.930 and 15 °C, respectively, allow controlling fungal contamination and minimizing the OTA production in several products as peanuts, corn, dried grapes and derived products for human consumption.
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Affiliation(s)
- Andrea L Astoreca
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Córdoba, Argentina.
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