Applications of lead phthalocyanines embedded in electrospun fibers for the photoinactivation of Escherichia coli in water

Osifeko, Olawale L; Nyokong, Tebello

Title: Applications of lead phthalocyanines embedded in electrospun fibers for the photoinactivation of Escherichia coli in water
Creator: Osifeko, Olawale L
Creator: Nyokong, Tebello
Date Issued: 2014
Date: 2014
Type: Article
Identifier: vital:7304
Identifier: http://hdl.handle.net/10962/d1020381
Description: Lead (II) pyridyloxyphthalocyanine (PbTpyPc) and its quaternized form (PbTepyPc) were synthesized and the photophysical behavior examined. Low fluorescence quantum yields (ΦF) of 0.01 and 0.02 were observed for PbTepyPc and PbTpyPc, respectively. The singlet oxygen quantum yields (ΦΔ) were 0.60 and 0.68, for PbTepyPc and PbTpyPc, respectively using DPBF as a quencher in DMF. Singlet oxygen production of the embedded sensitizers in electrospun fiber were quantified using ADMA and were found to be ΦΔ = 0.41 and ΦΔ = 0.21 for PbTepyPc and PbTpyPc, respectively. Photodynamic inactivation of Escherichia coli (E. coli) with the quaternized photosensitizer at 5 μM, totally inactivated the E. coli (with log CFU = 10 decrease). Only 0.4 log CFU decrease was obtained with PbTpyPc. The embedded non-quaternized photosensitizer (PbTpyPc) was less active on the gram negative bacteria but the quaternized photosensitizer (PbTepyPc) was effective towards inactivation of E. coli.
Description: Original publication is available at http://dx.doi.org/10.1016/j.dyepig.2014.05.010
Format: 8 pages
Format: pdf
Publisher: Elsevier
Language: English
Relation: Osifeko, O. L. & Nyokong, T. 2014. Applications of lead phthalocyanines embedded in electrospun fibers for the photoinactivation of Escherichia coli in water. Dyes and Pigments, 111:8–15. Available: http://dx.doi.org/10.1016/j.dyepig.2014.05.010.

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Nyokong, Tebello (Distinguished Professor)