Microbial risk assessment: integrating and quantifying the impacts of food processing operations on food safety

Augustin, Jean-Christophe; Ellouze, Mariem; Guillier, Laurent

doi:10.1002/9781118823071.ch30

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…In fact, in the exponential growth phase, bacterial cells divide non-stop, as long as nutrients are available and toxic substances are absent at the optimal neutral pH (7). As the physiological state is maximal, so is the growth rate [27] [28]. In the slowdown phase, there is depletion of nutritional resources in the culture medium and/or an accumulation of waste products produced by the bacteria [29].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Pandi,

Mokemiabeka,

Bidounga

et al. 2023

JBM

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The pollution of ecosystems as a result of urbanization, industrialization and poor agricultural practices is becoming increasingly alarming. This has a major impact on health and the economy. This pollution causes illness in humans and animals, even at low levels of exposure, leading to endocrine disorders, congenital malformations, cardiovascular disease, nervous system damage and cancer. They are a brake on redevelopment because of the threats they pose, generally causing an anaerobic environment by blocking the diffusion of air into the soil pores, thus affecting the microbial communities living there and preventing the infiltration of water necessary for plant growth. In an ecosystem subjected to various disturbances, changes can be observed in ecosystem structure and function, including loss of aesthetic values, changes in biomass or productivity, and changes in species composition. These include loss of aesthetic values, changes in biomass or productivity, and altered species composition, as a result of habitat loss, disruption of food webs and variations in macro-and micro-climatic environmental conditions. Respect for the environment is becoming a major concern in today's society. To remedy this, the concept of biological control was used as an alternative, with the selection of microorganisms of bioremediator interest. Twenty (20) isolates, including 10 (50%) from the Pseudomonas genus and 10 (50%) from the Bacillus genus, were isolated from landfills, identified and tested to assess their biofertilization (phosphate solubilization) and depollution (hydrocarbon degradation) potential, and to inhibit the growth of certain microorganisms. The results showed that all Pseudomonas and Bacillus isolates solubilized inorganic

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Pandi,

Mokemiabeka,

Bidounga

et al. 2023

JBM

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“…No entanto, os esporos são poucos afetados pela redução na atividade de água do meio devido à sua estrutura. Portanto, a temperatura é o principal fator envolvido na inativação de esporos (50,51) Nesse contexto, ao estabelecer critérios de performance, a variabilidade dever ser observada em cada etapa do processo, visto que, as diversas etapas da cadeia de produção impactam de formas distintas a sobrevivência dos esporos, e consequentemente nos limites estabelecidos no FSO (Food Safety Objective) (52,53) Este estudo estimou valores D110°C para esporos de 12 cepas de B. cereus considerando as distribuições de  obtidos experimentalmente e da distribuição do tempo médio de residência da partícula na câmara de secagem descritos na literatura. Os dados foram inseridos em um modelo de inativação linear e os melhores ajustes foram definidos por simulação usando o algoritmo de Monte Carlo (54)…”

Section: Discussionunclassified

“…Nesta etapa, há o efeito do calor na inativação microbiana, que é comumente expressado com uma cinética de primeira ordem. Considera-se que a taxa de inativação tem uma relação linear com a temperatura e, portanto, um aumento na temperatura de saída indica maiores efeitos na inativação dos micro-organismos (53,54). A temperatura de ar de saída é a temperatura na qual a partícula deixa a câmara de secagem, diversos estudos relatam que é o principal parâmetro que afeta a sobrevivência de micro-organismos em processo de secagem por spray drying (60)(61)(62)(63).…”

Section: Discussionunclassified

Resistência de esporos de "Bacillus cereus" ao processo de secagem por atomização

Alvarenga¹

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AGRADECIMENTOSÀ Deus por guiar-me sempre. Aos meus pais por acreditarem e incentivarem os meus sonhos. À vocês não tenho palavras para expressar minha admiração e minha gratidão! Aos meus irmãos, Neto e Ana Luísa, pelo incentivo e pelo apoio irrestrito. Vocês são parte desta conquista! Ao meu afilhado, Heitor, por todos os sorrisos recebidos. Muito obrigada! Ao meu namorado, Marcos, pela paciência, cumplicidade e fé. Você foi essencial durante a elaboração dessa tese. À você devo parte desta conquista! Ao meu orientador e amigo de longa data não tenho palavras para agradecer pela oportunidade e confiança em mim depositadas. À você, Anderson, devo parte desta conquista e da minha formação profissional. Muito obrigada! Aos meus amigos Bruna e Leo, muito obrigada por tornarem leves e divertidos o período do doutorado. Muito obrigada! Aos meus amigos Gerson, Humberto, Nathália e Tânia, pelos anos de convivência, amizade e companheirismo. À vocês, muito obrigada! Á Fernanda, pelas valiosas sugestões na fase de elaboração da tese. Muito obrigada! Ao Arthur, a Deboráh, a Lívia e Rosi pelos valiosos auxílios nos experimentos. Sem vocês este trabalho não teria sido concluído. Muito obrigada! Ao Eric, pela ajuda, incentivo e as longas conversas. Muito obrigada! A Profa. Dra. Miriam Hubinger pelo empréstimo do Spray Dryer.A Vanessa pelo auxílio durante as análises.Aos colegas do LMQA, muito obrigada pelo período de convivência! Ao CNPq pela bolsa de estudos concedida.A Capes e ao Faepex pelo auxílio financeiro.Aos membros da banca examinadora. À vocês agradeço as valiosas sugestões que contribuiriam para a melhoria deste trabalho. de controle mais estritas nas etapas de pré-processamento (ordenha e transporte do leite) visando-se, por exemplo, atender padrões ou especificações microbiológicas. Já a indústria de alimentos, que usa o leite em pó como matéria-prima para formulação de diversos produtos, pode utilizar estes dados no desenho de processos térmicos visando-se obter alimentos seguros e estáveis do ponto de vista microbiológico.

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An Assessment of Listeriosis Risk Associated with a Contaminated Production Lot of Frozen Vegetables Consumed Under Alternative Consumer Handling Scenarios

Zoellner¹,

Wiedmann

Ivanek³

2019

Journal of Food Protection

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Frozen foods do not support the growth of Listeria monocytogenes (LM) and should be handled appropriately for safety. However, consumer trends regarding preparation of some frozen foods may contribute to the risk of foodborne listeriosis, specifically when cooking instructions are not followed and frozen products are instead added directly to smoothies or salads. A quantitative microbial risk assessment model FFLLoRA (Frozen Food Listeria Lot Risk Assessment) was developed to assess the lot-level listeriosis risk due to LM contamination in frozen vegetables consumed as a ready-to-eat food. The model was designed to estimate listeriosis risk per serving and the number of illnesses per production lot of frozen vegetables contaminated with LM, considering individual facility factors such as lot size, prevalence of LM contamination, and consumer handling prior to consumption. A production lot of 1 million packages with 10 servings each was assumed. When at least half of the servings were cooked prior to consumption, the median risk of invasive listeriosis per serving in both the general and susceptible population was <1.0 × 10−16 with the median (5th, 95th percentiles) predicted number of illnesses per lot as 0 (0, 0) and 0 (0, 1) under the exponential and Weibull-gamma dose-response functions, respectively. In scenarios in which all servings are consumed as ready-to-eat, the median predicted risk per serving was 1.8 × 10−13 and 7.8 × 10−12 in the general and susceptible populations, respectively. The median (5th, 95th percentile) number of illnesses was 0 (0, 0) and 0 (0, 6) for the exponential and Weibull-Gamma models, respectively. Classification tree analysis highlighted initial concentration of LM in the lot, temperature at which the product is thawed, and whether a serving is cooked as main predictors for illness from a lot. Overall, the FFLLoRA provides frozen food manufacturers with a tool to assess LM contamination and consumer behavior when managing rare and/or minimal contamination events in frozen foods. HIGHLIGHTS

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Microbial risk assessment: integrating and quantifying the impacts of food processing operations on food safety

Cited by 3 publications

References 56 publications

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Resistência de esporos de "Bacillus cereus" ao processo de secagem por atomização

An Assessment of Listeriosis Risk Associated with a Contaminated Production Lot of Frozen Vegetables Consumed Under Alternative Consumer Handling Scenarios

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Microbial risk assessment: integrating and quantifying the impacts of food processing operations on food safety

Cited by 3 publications

References 56 publications

Evaluation of the Bioremediation Potential and Antimicrobial Activity of &lt;i&gt;Pseudomonas&lt;/i&gt; and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Evaluation of the Bioremediation Potential and Antimicrobial Activity of &lt;i&gt;Pseudomonas&lt;/i&gt; and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Resistência de esporos de "Bacillus cereus" ao processo de secagem por atomização

An Assessment of Listeriosis Risk Associated with a Contaminated Production Lot of Frozen Vegetables Consumed Under Alternative Consumer Handling Scenarios

Contact Info

Product

Resources

About

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo

Evaluation of the Bioremediation Potential and Antimicrobial Activity of <i>Pseudomonas</i> and Bacillus Bacteria Isolated from Landfills in Brazzaville, Congo