Comparison between the photocatalytic inactivation of Gram-positive E. faecalis and Gram-negative E. coli faecal contamination indicator microorganisms

Grieken, Rafael van; Marugán, Javier; Pablos, Cristina; Furones, Laura; López, Ainhoa

doi:10.1016/j.apcatb.2010.07.034

Cited by 129 publications

(62 citation statements)

References 56 publications

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“…Ions such as Cu 2+ and Ag + in combination with TiO 2 were reported to enhance its antimicrobial activity (72). Furthermore, the photocatalytic activity of TiO 2 was reported as performed against pure bacterial cultures, mixed cultures (128) and natural communities (129)(130)(131). As a general concept, photocatalytic surfaces or suspensions are referred to as being self-disinfecting rather than self-sterilizing.…”

Section: In Vitro Evaluation Of Tio 2 Antibacte-rial Activitymentioning

confidence: 99%

“…As mentioned above, different standard methods for testing antimicrobial efficiency of photocatalytic processes are available. Unfortunately, it is very difficult to compare results from different research groups, mainly because different bacterial strains have been used with different growth media and experimental conditions (128). A rigorous and scientific approach would be very helpful in order to produce comparable results and evaluate the real efficacy of photocatalysts in killing bacteria cells.…”

Section: Visai Et Almentioning

confidence: 99%

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Titanium Oxide Antibacterial Surfaces in Biomedical Devices

et al. 2011

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Int J Artif Organs ( 2011; : 9) 929-946 34 TITANIUM OXIDE AND ANTIBACTERIAL SURFACES IN BIOMEDICAL DEVICES Device-related infections: a clinical demand driving material science researchAn increasing number of clinical procedures requires the use of biomedical devices, whose widespread presence in modern therapeutic treatments is driving the demand for better performances and longer reliability. One of the major issues of both short-term devices and implantable prostheses is represented by device-related infections (DRIs) Accepted: August 31, 2011 rEViEW due to bacterial colonization and proliferation (1). About half of the 2 million cases of nosocomial infections that occur each year in the United States are associated with indwelling devices (2): these infections generally require a longer period of antibiotic therapy and repeated surgical procedures, resulting in potential risks for the patient and increased costs for the healthcare system. The planktonic bacteria that colonize a device surface tend to form a biofilm and the sessile bacterial cells, enclosed in a self-produced polymeric matrix of this kind, can withstand host immune responses and generally show extraordinary antibiotic resistance (3). Eventually, bacteria rapid multiply and disperse in planktonic form, giving rise

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Section: In Vitro Evaluation Of Tio 2 Antibacte-rial Activitymentioning

confidence: 99%

Section: Visai Et Almentioning

confidence: 99%

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

et al. 2011

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“…Se observa que en los experimentos realizados con NaCl no se alcanzó la desinfección efectiva, a diferencia de las pruebas realizadas con CaCO 3 y MgSO 4 . Es posible que el NaCl genere condiciones que favorecen la regeneración de la bacteria [20]. Los carbonatos también influencian el proceso e inhiben la desinfección efectiva, mientras que los sulfatos no provocan modificaciones dicho proceso.…”

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Efecto de la presencia de sales inorgánicas sobre la inactivación fotocatalítica de E. Coli en agua

2013

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MSC :65c20, 61.82.Fk, ResumenEn este artículo se presenta el efecto de las sales inorgánicas MgSO4, NaCl y CaCO3 en la desinfección fotocatalítica del agua. Se usó TiO2-P25 como fotocatalizador y E. Coli como microorganismo contaminante. Las pruebas de desinfección se realizaron mediante la iluminación controlada de reactores batch cargados con agua contaminada, sales y TiO2. Los resultados de estas pruebas fueron usados para determinar los parámetros cinéticos de un modelo tipo Langmuir-Hinshelwood. Se encontró que las sales tienen una fuerte influencia sobre la inactivación fotocatalítica de E. Coli, y que cada sal y su concentración afectan la desinfección de forma diferente y en el siguiente orden: NaCl>CaCO3>>MgSO4. Adicionalmente, el valor de los parámetros calculados fue diferente para cada sal, evidenciando que las sales afectan el

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“…The observed differences could mainly be attributed to several reasons, such as (i) impact of organic carbon composition of greywater samples; (ii) differences in cell wall complexity and thickness between Gram positive (FS) and Gram negative bacteria such as coliforms (TC and FC); and (iii) the presence of common anions in solution matrix. Since the hydroxyl radical attack occurs on the cell wall of bacteria, attention should be paid to differences in cell wall complexity and thickness, which may be the reason of different photocatalytic inactivation profiles [34][35][36]. FS were known to be a sub-group of Gram-positive bacteria which have considerably thicker cell walls consisting of many complex layers of lipopolysaccharides and lipoproteins.…”

Section: Kinetic Considerationsmentioning

confidence: 99%

“…Since the hydroxyl radical attack occurs on the cell wall of bacteria, attention should be paid to differences in cell wall complexity and thickness, which may be the reason of different photocatalytic inactivation profiles [34][35][36]. FS were known to be a sub-group of Gram-positive bacteria which have considerably thicker cell walls consisting of many complex layers of lipopolysaccharides and lipoproteins.…”

Section: Kinetic Considerationsmentioning

confidence: 99%

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

Uyguner-Demirel

Bekbölet

2016

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This study aimed to investigate TiO 2 photocatalytic degradation of synthetically-prepared greywater samples with differing compositional contents of organic matter (OM), anion concentration, and microbiological consortium. Treatment efficiency was followed through removal of organic matter content in terms of dissolved organic carbon (DOC), specific spectroscopic parameters, and bacterial inactivation. Photocatalytic degradation kinetics were expressed by pseudo first-order kinetic modeling. The best DOC removal rates were attained for greywater samples containing OM with lower molecular size fractions. In addition, either enhancing or reducing the effect of common anions as radical scavengers were observed depending on the composition and concentration of variables in the greywater matrix. Moreover, possibility of a photocatalytic disinfection process was found to be of a bacteria type specific in OM-loaded synthetic greywater samples. Photocatalytic destruction of fecal streptococci required longer irradiation periods under all conditions. Bacterial removal rates were found to be in the order of total coliform > fecal coliform > fecal streptococci, for low organic load greywater, and fecal coliform > total coliform > fecal streptococci, for high organic load greywater.

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Comparison between the photocatalytic inactivation of Gram-positive E. faecalis and Gram-negative E. coli faecal contamination indicator microorganisms

Cited by 129 publications

References 56 publications

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Efecto de la presencia de sales inorgánicas sobre la inactivación fotocatalítica de E. Coli en agua

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

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