Spore-Forming Bacteria

Remize, Fabienne

doi:10.1016/b978-0-08-100502-6.00007-8

Cited by 23 publications

(24 citation statements)

References 106 publications

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“…The bacteria in Firmicutes are mesophilic, thermophilic, or psychrotrophic; anaerobic or aerobic and use organic molecules or minerals for ATP formation. This phylum includes the orders Bacillales and Clostridiales, many members of which can sporulate in response to harsh environmental conditions, such as nutritional limitation or high cellular density [ 48 , 49 , 50 ]. The genetic material inside the spore is also resistant to severe environmental conditions, such as desiccation, high temperature, caustic chemicals, and radiation.…”

Section: Resultsmentioning

confidence: 99%

Effects of Atmospheric Plasma Corona Discharges on Soil Bacteria Viability

et al. 2020

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Crop contamination by soil-borne pathogenic microorganisms often leads to serious infection outbreaks. Plant protection requires disinfection of agricultural lands. The chemical and the physical disinfection procedures have several disadvantages, including an irreversible change in the soil ecosystem. Plasma, the “fourth state of matter” is defined as an ionized gas containing an equal number of negatively and positively charged particles. Cold-plasma technology with air or oxygen as the working gas generates reactive oxygen species, which are found to efficiently eradicate bacteria. In this study, we examined the effect of atmospheric plasma corona discharges on soil bacteria viability. Soil that was exposed to plasma for 60 s resulted in bacterial reduction by two orders of magnitude, from 1.1 × 105 to 2.3 × 103 cells g−1 soil. Exposure for a longer period of 5 min did not lead to further significant reduction in bacterial concentration (a final reduction of only 2.5 orders of magnitude). The bacterial viability was evaluated using a colorimetric assay based on the bacterial hydrogenases immediately after exposure and at selected times during 24 h. The result showed no recovery in the bacterial viability. Plasma discharged directly on bacteria that were isolated from the soil resulted in a reduction by four orders of magnitude in the bacterial concentration compared to untreated isolated bacteria: 2.6 × 10−3 and 1.7 × 10−7, respectively. The plasma-resistant bacteria were found to be related to the taxonomic phylum Firmicutes (98.5%) and comprised the taxonomic orders Bacillales (95%) and Clostridiales (2%). To our knowledge, this is the first study of soil bacteria eradication using plasma corona discharges.

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Section: Resultsmentioning

confidence: 99%

Effects of Atmospheric Plasma Corona Discharges on Soil Bacteria Viability

et al. 2020

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“…Food spoilage is influenced by oxygen availability, temperature, relative humidity, water content, and pH [ 137 ]. For this reason, besides the characteristics of the edible films and coatings themselves, it is of great interest to maintain the characteristics of the food, including: (i) preservation of microbiological parameters in accordance with established laws; (ii) preservation of nutritional content; and (iii) preservation of physical and sensory characteristics (e.g., smell, taste, and texture); which together extend the shelf-life of the product [ 136 ].…”

Section: Recent Advances In Edible Films and Coatingsmentioning

confidence: 99%

Edible Films and Coatings as Food-Quality Preservers: An Overview

Díaz‐Montes

Castro-Muñoz

2021

Foods

246

110

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Food preservation technologies are currently facing important challenges at extending the shelf-life of perishable food products (e.g., meat, fish, milk, eggs, and many raw fruits and vegetables) that help to meet the daily nutrient requirement demand. In addition, food preservation has gone beyond only preservation; the current techniques are focused on the fulfillment of two additional objectives, the suitability of the used processes and generation of environmentally friendly products with non-presence of any side effect on health. Moreover, they are also looking for additional nutritional properties. One of these preservation protocols deals with the use of edible films and coatings. Therefore, this review shows an overview of synthetic materials (e.g., glass, aluminum, plastic, and paperboard), as well as the regulations that limit their application in food packaging. Further, this review releases the current-state-of-the-art of the use of films and edible coatings as an alternative to conventional packaging, providing the main features that these biodegradable packaging should meet towards specific uses for the conservation and improvement of various food products. Herein, particular attention has been paid to the main used components (e.g., biopolymers, additives, bioactive, and probiotic components), manufacturing methods (for edible films or coatings) and their application to specific products. In addition, an outlook of the application of edible films and coatings as quality indicators of perishable products is shown.

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“…Because of their ubiquitous nature, bacterial spore-formers are widely located in all types of foods. From the beginning of the 20th century, it has been studied the spore-forming bacteria, especially the pathogenic species, but rapidly, spoilage spore-forming bacteria were also investigated (Remize, 2016). Indeed, in recent years, there has been an increasing interest in spore-forming bacteria, because they are considered a major risk in heat-treated food production plants.…”

Section: Pathogenic Spore-forming Bacteriamentioning

confidence: 99%

“…They are composed of an internal membrane, a cortex, an external membrane, a coat, and possibly an exosporium. Each layer presents specific structural, biochemical, and permeability properties (Remize, 2016). Exosporium is a thin delicate covering made of proteins.…”

Section: Sporulation and Germination Process And Morphology Sporementioning

confidence: 99%