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Photophysical and antibacterial properties of complex systems based on smectite, a cationic surfactant and methylene blue

Paper ID Volume ID Publish Year Pages File Format Full-Text
30226 44465 2015 7 PDF Available
Title
Photophysical and antibacterial properties of complex systems based on smectite, a cationic surfactant and methylene blue
Abstract

•The modification of Sap with the cationic surfactant led to a significant enhancement of MB photophysical activity.•Surface properties of smectites play an important role in contact with bacterial cells.•Photodynamic efficiency depended on the growth phase of bacteria.•The MB/Sap ratio played a significant role for the interaction with cells.•Organically-modified Mon with MB has highest antimicrobial effect.

Solid or colloidal materials with embedded photosensitizers are promising agents from the medical or environmental perspective, where the direct use of photoactive solutions appears to be problematic. Colloids based on layered silicates of the saponite (Sap) and montmorillonite (Mon) type, including those modified with dodecylammonium cations (C12) and photosensitizer – methylene blue (MB) were studied. Two representatives of bacteria, namely Enterobacter cloacae and Escherichia coli, were selected for this work. A spectral study showed that MB solutions and also colloids with Sap including C12 exhibited the highest photoactivities. The antimicrobial properties of the smectite colloids were not directly linked to the photoactivity of the adsorbed MB cations. They were also influenced by other parameters, such as light vs. dark conditions, the spectrum, power and duration of the light used for the irradiation; growth phases, and the pre-treatment of microorganisms. Both the photoactivity and antimicrobial properties of the colloids were improved upon pre-modification with C12. Significantly higher antimicrobial properties were observed for the colloids based on Mon with MB in the form of molecular aggregates without significant photoactivities. The MB/Mon colloids, both modified and non-modified with C12 cations, exhibited higher antimicrobial effects than pure MB solution. Besides the direct effect of photosensitization, the surface properties of the silicate particles likely played a crucial role in the interactions with microorganisms.

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Keywords
Saponite; Montmorillonite; Enterobacter cloacae; Escherichia coli; Methylene blue; Photodynamic inactivation
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Photophysical and antibacterial properties of complex systems based on smectite, a cationic surfactant and methylene blue
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 151, October 2015, Pages 135–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us