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Thomas Verdier
LMDC, Université de Toulouse, INSA/UPS Génie Civil, 135 Avenue de Rangueil, 31077 Toulouse Cedex 04, France

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Journal article
Published: 01 June 2021 in Proceedings of the Institution of Civil Engineers - Construction Materials
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In indoor environment, the growth of microorganisms on building materials leads to the deterioration of both materials and indoor air quality. As bio-based building materials usually contain cellulose or derivatives, they are likely to be much more sensitive to such degradations. Using glycerol esters could be a way to protect bio-based materials from microorganisms. Indeed, previous works have highlighted their significant antimicrobial effect and they are commonly used in the food industry as antimicrobial agents. In addition, as glycerol is a valuable by-product of agroindustry, it would be an eco-friendly alternative, consistent with human health, to the classic ways of protecting bio-based materials against microorganisms This study is included in a project that aims to (i) assess the hygrothermal performances and fire reaction of sunflower pannels and (ii) to study the antimicrobial efficiency of glycerol esters for the protection of such bio-based materials from microbial proliferation. Materials presented physical, thermal and hygroscopic properties similar to bio-based materials such as wood or hemp, encouraging their use as insulation materials. In addition, glycerol ester showed significant antimicrobial effects but also a susceptibility to flammability. One unanticipated finding was that the untreated insulation material made of sunflower pith was classified as non flammable.

ACS Style

Thomas Verdier; Lesmie Balthazard; Mathilde Montibus; Camille Magniont; Philippe Evon; Alexandra Bertron. Using glycerol esters to prevent microbial growth on sunflower-based insulation panels. Proceedings of the Institution of Civil Engineers - Construction Materials 2021, 174, 140 -149.

AMA Style

Thomas Verdier, Lesmie Balthazard, Mathilde Montibus, Camille Magniont, Philippe Evon, Alexandra Bertron. Using glycerol esters to prevent microbial growth on sunflower-based insulation panels. Proceedings of the Institution of Civil Engineers - Construction Materials. 2021; 174 (3):140-149.

Chicago/Turabian Style

Thomas Verdier; Lesmie Balthazard; Mathilde Montibus; Camille Magniont; Philippe Evon; Alexandra Bertron. 2021. "Using glycerol esters to prevent microbial growth on sunflower-based insulation panels." Proceedings of the Institution of Civil Engineers - Construction Materials 174, no. 3: 140-149.

Journal article
Published: 05 March 2018 in Coatings
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Use of photocatalytic paint-like coatings may be a way to protect building materials from microbial colonization. Numerous studies have shown the antimicrobial efficiency of TiO 2 photocatalysis on various microorganisms. However, few have focused on easy-to-apply solutions and on photocatalysis under low irradiance. This paper focuses on (a) the antibacterial properties of a semi-transparent coating formulated using TiO 2 particles and (b) the microscopic investigations of bacterial biofilm development on TiO 2 -coated building materials under accelerated growth conditions. Results showed significant antibacterial activity after few hours of testing. The efficiency seemed limited by the confinement of the TiO 2 particles inside the coating binder. However, a pre-irradiation with UV light can improve efficiency. In addition, a significant effect against the formation of a bacterial biofilm was also observed. The epifluorescence approach, in which fluorescence is produced by reflect rather than transmitted light, could be applied in further studies of microbial growth on coatings and building materials.

ACS Style

Thomas Verdier; Alexandra Bertron; Benjamin Erable; Christine Roques. Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material. Coatings 2018, 8, 93 .

AMA Style

Thomas Verdier, Alexandra Bertron, Benjamin Erable, Christine Roques. Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material. Coatings. 2018; 8 (3):93.

Chicago/Turabian Style

Thomas Verdier; Alexandra Bertron; Benjamin Erable; Christine Roques. 2018. "Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material." Coatings 8, no. 3: 93.

Journal article
Published: 01 January 2016 in Matériaux & Techniques
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Matériaux & Techniques, la revue des matériaux industriels et de leurs techniques de mise en oeuvre

ACS Style

T. Verdier; Alexandra Bertron; R. Valentin; G. Nyame Mendendy Boussambe; Z. Mouloungui; C. Roques. Monoglyceride to protect building materials against microbial proliferation. Matériaux & Techniques 2016, 104, 508 .

AMA Style

T. Verdier, Alexandra Bertron, R. Valentin, G. Nyame Mendendy Boussambe, Z. Mouloungui, C. Roques. Monoglyceride to protect building materials against microbial proliferation. Matériaux & Techniques. 2016; 104 (5):508.

Chicago/Turabian Style

T. Verdier; Alexandra Bertron; R. Valentin; G. Nyame Mendendy Boussambe; Z. Mouloungui; C. Roques. 2016. "Monoglyceride to protect building materials against microbial proliferation." Matériaux & Techniques 104, no. 5: 508.

Journal article
Published: 22 August 2014 in Coatings
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In damp environments, indoor building materials are among the main proliferation substrates for microorganisms. Photocatalytic coatings, including nanoparticles of TiO2, could be a way to prevent microbial proliferation or, at least, to significantly reduce the amount of microorganisms that grow on indoor building materials. Previous works involving TiO2 have already shown the inactivation of bacteria by the photocatalysis process. This paper studies the inactivation of Escherichia coli bacteria by photocatalysis involving TiO2 nanoparticles alone or in transparent coatings (varnishes) and investigates different parameters that significantly influence the antibacterial activity. The antibacterial activity of TiO2 was evaluated through two types of experiments under UV irradiation: (I) in slurry with physiological water (stirred suspension); and (II) in a drop deposited on a glass plate. The results confirmed the difference in antibacterial activity between simple drop-deposited inoculum and inoculum spread under a plastic film, which increased the probability of contact between TiO2 and bacteria (forced contact). In addition, the major effect of the nature of the suspension on the photocatalytic disinfection ability was highlighted. Experiments were also carried out at the surface of transparent coatings formulated using nanoparticles of TiO2. The results showed significant antibacterial activities after 2 h and 4 h and suggested that improving the formulation would increase efficiency.

ACS Style

Thomas Verdier; Marie Coutand; Alexandra Bertron; Christine Roques. Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects. Coatings 2014, 4, 670 -686.

AMA Style

Thomas Verdier, Marie Coutand, Alexandra Bertron, Christine Roques. Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects. Coatings. 2014; 4 (3):670-686.

Chicago/Turabian Style

Thomas Verdier; Marie Coutand; Alexandra Bertron; Christine Roques. 2014. "Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects." Coatings 4, no. 3: 670-686.