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| Author(s): |
Roberta Regina Delboni
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Matemática, Estatística e Computação Científica |
| Defense date: | 2015-01-12 |
| Examining board members: |
Hyun Mo Yang;
Bianca Morelli Rodolfo Calsavara;
José Luiz Boldrini;
José Fernando Fontanari;
Paulo Fernando de Arruda Mancera
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| Advisor: | Hyun Mo Yang |
| Abstract | |
Microbial contamination is a big problem for the food industry and also for the public health. The economic losses occur due to civil process impacting negatively to the industry. The challenge is the attending demands for minimally processed foods, such as the avoiding of intense heat treatments and the reduction of the addition of chemical preservatives, but at the same time ensuring microbiological safety of these products. Lactic acid bacteria are traditionally used in the production of fermented foods. They are responsible for the production of antimicrobial compounds, such as organic acids and bacteriocins, which are protein compounds with bactericidal effect against related species and bacteria such as Listeria monocytogenes and Staphylococcus aureus. Aiming to study quantitatively the biological control as a technique of conservation, we developed a mathematical model to describe the interaction between lactic acid bacteria and contaminating bacteria in the food. The differential of the proposed model is the inclusion of quorum sensing effect in the growth rate of lactic acid bacteria and also in the bacteriocin production rate. The goal of this study is to find the thresholds which determine the existence of multiple equilibria and analyze their biological significance. The steady state and dynamical trajectories analyses of the model permit us to study the suitability of including lactic bacteria in order to reduce the growth of undesirable bacteria in food (AU) | |
| FAPESP's process: | 08/10735-0 - Evaluating strategies for the containmet of pathogenic microorganisms development in processed foods |
| Grantee: | Roberta Regina Delboni |
| Support Opportunities: | Scholarships in Brazil - Doctorate |