The effect of photocatalytic coatings on microbial attachment in brewery field tests

Erna Storgårds, Outi Priha, J. Laakso, K. Tapani, E. Levänen, T. Mäntylä

Research output: Contribution to conferenceConference articleScientific

Abstract

Photocatalytic coatings have been reported to improve cleanability of surfaces and reduce bacterial attachment1,2,3. Only field tests, however, will eventually reveal their effect in industrial applications. Field tests cannot replace standardised laboratory tests due to uncontrolled variables and limited number of replicates, but they give valuable additional information. Here we report results from brewery field tests, where test coupons with photocatalytic coatings were mounted onto bottling machines for 18 months. In the brewery field tests, microbial attachment on photocatalytic and antibacterial TiO2+silver coatings was reduced compared to stainless steel for 6 months. The effect of TiO2 without silver was less clear. After 18 months the effect was lost, possibly due to the silica precipitates found on all test surfaces and to dissolving of silver ions. In spite of challenges connected to field tests in industrial environments, we conclude that functional coatings have potential in reducing the attachment of microorganisms at critical sites and facilitating their removal in cleaning operations. Long-term durability of the coatings and elimination of precipitates are questions still to be solved. The possible adverse effects of silver ions in the environment encourage the development of efficient photocatalytic coatings without antimicrobial additives. 1Kühn K P, Chaberny IF, Massholder K, Stickler M, Benz VW, Sonntag H-G & Erdinger L (2003) Disinfection of surfaces by photocatalytic oxidation with titanium dioxide and UVA light. Chemosphere 53: 71-77. 2Raulio M, Pore V, Areva S, Ritala M, Leskelä M, Lindén M, Rosenholm JB, Lounatmaa K & Salkinoja-Salonen MS (2006) Destruction of Deinococcus geothermalis biofilm by photocatalytic ALD and sol-gel TiO2 surfaces. J. Ind. Microbiol. Biotechnol. 33 :261-268. 3Allion A, Merlot M, Boulangé-Petermann L, Archambeau C, Choquet P & Damasse J-M (2007) Thin photocatalytic TiO2 coatings: impact on bioadhesion and cell viability. Plasma Processes Polym. 4: S374-S379.
Original languageEnglish
Publication statusPublished - 2011
MoE publication typeNot Eligible
EventPhotocatalytic and Superhydrophilic Surfaces Workshop, PSS2011 - Manchester Metropolitan University, Manchester, United Kingdom
Duration: 12 Sep 2011 → …

Workshop

WorkshopPhotocatalytic and Superhydrophilic Surfaces Workshop, PSS2011
Abbreviated titlePSS2011
CountryUnited Kingdom
CityManchester
Period12/09/11 → …

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Silver
Deinococcus
Ions
Disinfection
Stainless Steel
Polymethyl Methacrylate
Biofilms
Silicon Dioxide
Cell Survival
Gels
Light

Cite this

Storgårds, E., Priha, O., Laakso, J., Tapani, K., Levänen, E., & Mäntylä, T. (2011). The effect of photocatalytic coatings on microbial attachment in brewery field tests. Paper presented at Photocatalytic and Superhydrophilic Surfaces Workshop, PSS2011, Manchester, United Kingdom.
Storgårds, Erna ; Priha, Outi ; Laakso, J. ; Tapani, K. ; Levänen, E. ; Mäntylä, T. / The effect of photocatalytic coatings on microbial attachment in brewery field tests. Paper presented at Photocatalytic and Superhydrophilic Surfaces Workshop, PSS2011, Manchester, United Kingdom.
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Storgårds, E, Priha, O, Laakso, J, Tapani, K, Levänen, E & Mäntylä, T 2011, 'The effect of photocatalytic coatings on microbial attachment in brewery field tests' Paper presented at Photocatalytic and Superhydrophilic Surfaces Workshop, PSS2011, Manchester, United Kingdom, 12/09/11, .

The effect of photocatalytic coatings on microbial attachment in brewery field tests. / Storgårds, Erna; Priha, Outi; Laakso, J.; Tapani, K.; Levänen, E.; Mäntylä, T.

2011. Paper presented at Photocatalytic and Superhydrophilic Surfaces Workshop, PSS2011, Manchester, United Kingdom.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - The effect of photocatalytic coatings on microbial attachment in brewery field tests

AU - Storgårds, Erna

AU - Priha, Outi

AU - Laakso, J.

AU - Tapani, K.

AU - Levänen, E.

AU - Mäntylä, T.

N1 - NT Food solutions

PY - 2011

Y1 - 2011

N2 - Photocatalytic coatings have been reported to improve cleanability of surfaces and reduce bacterial attachment1,2,3. Only field tests, however, will eventually reveal their effect in industrial applications. Field tests cannot replace standardised laboratory tests due to uncontrolled variables and limited number of replicates, but they give valuable additional information. Here we report results from brewery field tests, where test coupons with photocatalytic coatings were mounted onto bottling machines for 18 months. In the brewery field tests, microbial attachment on photocatalytic and antibacterial TiO2+silver coatings was reduced compared to stainless steel for 6 months. The effect of TiO2 without silver was less clear. After 18 months the effect was lost, possibly due to the silica precipitates found on all test surfaces and to dissolving of silver ions. In spite of challenges connected to field tests in industrial environments, we conclude that functional coatings have potential in reducing the attachment of microorganisms at critical sites and facilitating their removal in cleaning operations. Long-term durability of the coatings and elimination of precipitates are questions still to be solved. The possible adverse effects of silver ions in the environment encourage the development of efficient photocatalytic coatings without antimicrobial additives. 1Kühn K P, Chaberny IF, Massholder K, Stickler M, Benz VW, Sonntag H-G & Erdinger L (2003) Disinfection of surfaces by photocatalytic oxidation with titanium dioxide and UVA light. Chemosphere 53: 71-77. 2Raulio M, Pore V, Areva S, Ritala M, Leskelä M, Lindén M, Rosenholm JB, Lounatmaa K & Salkinoja-Salonen MS (2006) Destruction of Deinococcus geothermalis biofilm by photocatalytic ALD and sol-gel TiO2 surfaces. J. Ind. Microbiol. Biotechnol. 33 :261-268. 3Allion A, Merlot M, Boulangé-Petermann L, Archambeau C, Choquet P & Damasse J-M (2007) Thin photocatalytic TiO2 coatings: impact on bioadhesion and cell viability. Plasma Processes Polym. 4: S374-S379.

AB - Photocatalytic coatings have been reported to improve cleanability of surfaces and reduce bacterial attachment1,2,3. Only field tests, however, will eventually reveal their effect in industrial applications. Field tests cannot replace standardised laboratory tests due to uncontrolled variables and limited number of replicates, but they give valuable additional information. Here we report results from brewery field tests, where test coupons with photocatalytic coatings were mounted onto bottling machines for 18 months. In the brewery field tests, microbial attachment on photocatalytic and antibacterial TiO2+silver coatings was reduced compared to stainless steel for 6 months. The effect of TiO2 without silver was less clear. After 18 months the effect was lost, possibly due to the silica precipitates found on all test surfaces and to dissolving of silver ions. In spite of challenges connected to field tests in industrial environments, we conclude that functional coatings have potential in reducing the attachment of microorganisms at critical sites and facilitating their removal in cleaning operations. Long-term durability of the coatings and elimination of precipitates are questions still to be solved. The possible adverse effects of silver ions in the environment encourage the development of efficient photocatalytic coatings without antimicrobial additives. 1Kühn K P, Chaberny IF, Massholder K, Stickler M, Benz VW, Sonntag H-G & Erdinger L (2003) Disinfection of surfaces by photocatalytic oxidation with titanium dioxide and UVA light. Chemosphere 53: 71-77. 2Raulio M, Pore V, Areva S, Ritala M, Leskelä M, Lindén M, Rosenholm JB, Lounatmaa K & Salkinoja-Salonen MS (2006) Destruction of Deinococcus geothermalis biofilm by photocatalytic ALD and sol-gel TiO2 surfaces. J. Ind. Microbiol. Biotechnol. 33 :261-268. 3Allion A, Merlot M, Boulangé-Petermann L, Archambeau C, Choquet P & Damasse J-M (2007) Thin photocatalytic TiO2 coatings: impact on bioadhesion and cell viability. Plasma Processes Polym. 4: S374-S379.

M3 - Conference article

ER -

Storgårds E, Priha O, Laakso J, Tapani K, Levänen E, Mäntylä T. The effect of photocatalytic coatings on microbial attachment in brewery field tests. 2011. Paper presented at Photocatalytic and Superhydrophilic Surfaces Workshop, PSS2011, Manchester, United Kingdom.