Antifungal capability of TiO2 coated film on moist wood

Chen, Fengna; Yang, Xudong; Wu, Qiong

doi:10.1016/j.buildenv.2008.07.018

Cited by 123 publications

(79 citation statements)

References 17 publications

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“…Similar observation has been already reported for Aspergillus niger by Chen, et al (12), i.e., that these species are generally resistant to the photocatalytic process also under strong irradiation with UVA. In addition, many Aspergilli species have been described as a fungus resistant for lower water activity, i.e., they are xerophilic fungi.…”

Section: Resultssupporting

confidence: 73%

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Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

Markowska‐Szczupak¹,

Janda²,

Wang³

et al. 2015

Cent Eur J Public Health

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SUMMARYAim: The aim of this study was to determine the antifungal activity of titanium dioxide activated by indoor light on Czapek Yeast Agar (CYA). Methods: The agar plate method was used and titania P25 (Evonik) was added to the medium in the amount of 20 g.dm -3 . The control experiments without titania were also carried out. The water activity (a w ) of the basal media was adjusted to 0.999, 0.997, 0.975, 0.950, 0.900 and 0.850 with sodium chloride. The photoactivity of titania was tested for six strains of potentially pathogenic fungi: Aspergillus versicolor (WB130, W11), Stachybotrys chartarum (STA1), Pseudallescheria boydii (AP25), Pseudallescheria ellipsoidea (ZUT12), Scedosporium apiospermum (ZUT11), Scedosporium aurantiacum (ZUT4BIS). After inoculation with fungal spore suspensions, one part of CYA plates was incubated in dark, while another part was daily exposed to indoor light for 12 hours per day. The plates were incubated at 25°C for 10 days. The daily growth rates (mm × day -1 ) were calculated from the linear regression equation.Results: The CYA supplementation with titanium dioxide for different availability of water resulted in the decrease of fungal growth rates in dark and under irradiation. The lowest and the highest rates of daily growth were obtained in the presence and absence of titania for the low and high water activity (0.900 a w and 0.999 a w ), respectively.Conclusions: Fungi did not grow on all examined media with the lowest water activity (a w ≤ 0.850) which confirmed necessity of water for their growth. The fungi Pseudallescheria-Scedosporium were the most sensitive to titania and water activity, while the strains of Aspergillus versicolor were the most resistant to the presence of titania and lack of water. It has been shown that the lack of accessible water resulted in the strongest action of titanium dioxide both in dark and under irradiation. For the lowest amount of accessible water irradiation of titania resulted in complete inhibition of fungal growth. While, under dark conditions, titania presence enhanced the growth of persistent fungi, i.e., Aspergillus versicolor. It is assumed that these fungi could obtain water from the water-rich titania surface.

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Section: Resultssupporting

confidence: 73%

“…However, the majority of studies on the antimicrobial activity of titanium dioxide were performed for bacteria and yeast (8)(9)(10). There are only a few studies focusing on the photocatalytic removal of potentially pathogenic fungi since they are much more persistent than simple bacteria organisms (11)(12)(13).…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

Markowska‐Szczupak¹,

Janda²,

Wang³

et al. 2015

Cent Eur J Public Health

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“…The results have confirmed the findings by Maneerat and Hayata 21 and Mitoraj et al 34 ; concerning the inhibition effect of TiO 2 -mediated photocatalysis on fungal growth. Chen et al 25 also found that photocatalytic disinfection processes were effective in the A. niger growth inhibition only under UVA irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…Most of the works has determined the removal rates of pathogenic microorganisms from drinking water and wastewater 6, 8 -9, 16 -20 , while only some papers have concerned the elimination of fungi by TiO 2 -mediated photocatalysis 11, 21 -25 . Currently, there is considerable interest in the application of TiO 2 photocatalytic reactions in building industry to protection of building materials from biodeteriorating microorganisms, especially from fungi 25,26 .…”

Section: Introductionmentioning

confidence: 99%

A preliminary study on antifungal effect of TiO₂-based paints in natural indoor light

Markowska‐Szczupak

Ulfig

Grzmil

et al. 2010

Polish Journal of Chemical Technology

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The antifungal activity of four commercial photocatalytic paints (KEIM Ecosil ME, Titanium FA, Photo Silicate and Silicate D) in natural indoor light was investigated. The paints contained TiO 2 in rutile and anatase crystalline forms as evidenced by means of the X-ray diffraction analysis. In most cases the paints inhibited growth of fungi viz. Trichoderma viride, Aspergillus niger, Coonemeria crustacea, Eurotium herbariorum, and Dactylomyces sp . The KEIM Ecosil ME paint displayed the highest antifungal effect in the light, which could be explained with the highest anatase content. The paint antifungal activity and the fungal sensitivity to the TiO 2-mediated photocatalytic reaction both decreased in the following orders: KEIM Ecosil ME > Titanium FA > Photo Silicate > Silicate D and T. viride > Dactylomyces sp. > A. niger > E. herbariorum.

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“…Studies using the two materials (TiO 2 -wood) proved that the fungicidal action of TiO 2 is related to photocatalytic activity, to pore size reduction in the cell wall of the wood through impregnation, and/or to decreased moisture absorption capacity (Weigenand et al, 2008;Chen et al, 2009;De Filpo et al, 2013). The TiO 2 absorbs energy from the ultraviolet (UV) region and forms reactive oxygen species such as the OH -radicals, which cause inactivation by oxidation or deterioration in the cell wall of microorganisms, thus inhibiting cell breathing and, consequently, leading to mortality (Markowska-Szczupak et al, 2011;Foster et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Resistance of TiO2-treated Eucalyptus botryoides Wood to the Fungus Ganoderma applanatum

et al. 2018

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The aim of the present study is to investigate the resistance of Eucalyptus botryoides treated with TiO 2 particles to attack by the fungus Ganoderma applanatum. The Bethel treatment method was applied to wood specimens (25 × 25 × 9 mm) and compared to CCB. The wood was subjected to the accelerated decay test and characterized through Rockwell Hardness and Fourier Transform Infrared Spectroscopy (FT-IR). The TiO 2 -treated wood showed lower degradation and greater resistance to the penetration of a steel sphere (Rockwell Hardness) than the untreated wood. In addition, the results of the TiO 2 treatment were statistically equal to those of CCB. The FT-IR analysis showed that the fungus degraded lignin and hemicellulose in untreated samples. The present results showed the TiO 2 efficiency in forming a protective layer on the cell wall and in preventing the development of microorganisms, a fact that verifies its fungicidal action on wood.

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Antifungal capability of TiO2 coated film on moist wood

Cited by 123 publications

References 17 publications

Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

A preliminary study on antifungal effect of TiO₂-based paints in natural indoor light

Resistance of TiO2-treated Eucalyptus botryoides Wood to the Fungus Ganoderma applanatum

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Antifungal capability of TiO2 coated film on moist wood

Cited by 123 publications

References 17 publications

Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

Effect of Water Activity and Titania P25 Photocatalyst on Inactivation of Pathogenic Fungi - Contribution to the Protection of Public Health

A preliminary study on antifungal effect of TiO2-based paints in natural indoor light

Resistance of TiO2-treated Eucalyptus botryoides Wood to the Fungus Ganoderma applanatum

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A preliminary study on antifungal effect of TiO₂-based paints in natural indoor light