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Sarkar D, Hunt I, Macdonald C, Wang B, Bowman JP, Tamplin ML. Modelling growth of Bacillus cereus in paneer by one-step parameter estimation. Food Microbiol 2023; 112:104231. [PMID: 36906319 DOI: 10.1016/j.fm.2023.104231] [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: 10/25/2022] [Revised: 01/08/2023] [Accepted: 01/22/2023] [Indexed: 02/07/2023]
Abstract
Bacillus cereus phylogenetic group III and IV strains are commonly associated with food products and cause toxin mediated foodborne diseases. These pathogenic strains have been identified from milk and dairy products, such as reconstituted infant formula and several cheeses. Paneer is a fresh, soft cheese originating from India that is prone to foodborne pathogen contamination, such as by Bacillus cereus. However, there are no reported studies of B. cereus toxin formation in paneer or predictive models quantifying growth of the pathogen in paneer under different environmental conditions. This study assessed enterotoxin-producing potential of B. cereus group III and IV strains, isolated from dairy farm environments, in fresh paneer. Growth of a four-strain cocktail of toxin-producing B. cereus strains was measured in freshly prepared paneer incubated at 5-55 °C and modelled using a one-step parameter estimation combined with bootstrap re-sampling to generate confidence intervals for model parameters. The pathogen grew in paneer between 10 and 50 °C and the developed model fit the observed data well (R2 = 0.972, RMSE = 0.321 log10 CFU/g). The cardinal parameters for B. cereus growth in paneer along with the 95% confidence intervals were: μopt 0.812 log10 CFU/g/h (0.742, 0.917); Topt is 44.177 °C (43.16, 45.49); Tmin is 4.405 °C (3.973, 4.829); Tmax is 50.676 °C (50.367, 51.144). The model developed can be used in food safety management plans and risk assessments to improve safety of paneer while also adding to limited information on B. cereus growth kinetics in dairy products.
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Affiliation(s)
- Dipon Sarkar
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
| | - Ian Hunt
- Centre of Food Safety & Innovation, University of Tasmania, Private Bag 54, Sandy Bay, Tasmania, 7005, Australia.
| | - Cameron Macdonald
- 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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Bursová Š, Necidová L, Haruštiaková D. Growth and toxin production of Bacillus cereus strains in reconstituted initial infant milk formula. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Koh WY, Utra U, Ahmad R, Rather IA, Park YH. Evaluation of probiotic potential and anti-hyperglycemic properties of a novel Lactobacillus strain isolated from water kefir grains. Food Sci Biotechnol 2018; 27:1369-1376. [PMID: 30319846 DOI: 10.1007/s10068-018-0360-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 02/20/2018] [Accepted: 03/19/2018] [Indexed: 11/29/2022] Open
Abstract
A total of eight strains of lactic acid bacteria were isolated from water kefir grains and assessed for their in vitro α-glucosidase inhibitory activity. Lactobacillus mali K8 demonstrated significantly higher inhibition as compared to the other strains, thus was selected for in vitro probiotic potential characterization, antibiotic resistance, hemolytic activity and adaptation to pumpkin fruit puree. L. mali K8 demonstrated tolerance to pH 2.5 and resisted the damaging effects of bile salts, pepsin and pancreatin, comparable to that of Lactobacillus rhamnosus GG ATCC 53103 (reference strain). Lack of hemolytic activity and susceptibility to the five standard antibiotics indicated the safety of the K8 strain. This strain showed singular properties to be used as starters in the pumpkin fruit puree fermentation. These preliminary in vitro tests indicated the safety and functionality of the K8 strain and its potential as a probiotic candidate.
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Affiliation(s)
- Wee Yin Koh
- 1Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden, Penang Malaysia
| | - Uthumporn Utra
- 1Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden, Penang Malaysia
| | - Rosma Ahmad
- 2Bioprocess Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden, Penang Malaysia
| | - Irfan A Rather
- 3Department of Applied Microbiology and Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Yong-Ha Park
- 3Department of Applied Microbiology and Biotechnology, Yeungnam University, Gyeongsan, South Korea
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Yang Y, Yu X, Zhan L, Chen J, Zhang Y, Zhang J, Chen H, Zhang Z, Zhang Y, Lu Y, Mei L. Multilocus sequence type profiles of Bacillus cereus isolates from infant formula in China. Food Microbiol 2017; 62:46-50. [DOI: 10.1016/j.fm.2016.09.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 09/09/2016] [Accepted: 09/11/2016] [Indexed: 12/19/2022]
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Li F, Zuo S, Yu P, Zhou B, Wang L, Liu C, Wei H, Hengyi Xu. Distribution and expression of the enterotoxin genes of Bacillus cereus in food products from Jiangxi Province, China. Food Control 2016. [DOI: 10.1016/j.foodcont.2016.02.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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