News Column

Researchers' Work from Leiden University Focuses on Liposomes (Enhanced Photoinduced Electron Transfer at the Surface of Charged Lipid Bilayers)

August 20, 2014

By a News Reporter-Staff News Editor at Biotech Week -- Current study results on Biotechnology have been published. According to news reporting originating from Leiden, Netherlands, by NewsRx correspondents, research stated, "Photocatalytic systems often suffer from poor quantum yields due to fast charge recombination: The energy-wasting annihilation of the photochemically created charge-separated state. In this report, we show that the efficiency of photoinduced electron transfer from a sacrificial electron donor to positively charged methyl viologen, or to negatively charged 5,5'-dithiobis(2-nitrobenzoate), increases dramatically upon addition of charged phospholipid vesicles if the charge of the lipids is of the same sign as that of the electron acceptor."

Our news editors obtained a quote from the research from Leiden University, "Centrifugation and UV/Vis titration experiments showed that the charged photosensitizers adsorb at the liposome surface, that is, where the photocatalytic reaction takes place. The increased photoelectron transfer efficiency in the presence of charged liposomes has been ascribed to preferential electrostatic interactions between the photosensitizer and the membrane, which prevents the formation of photosensitizer-electron-acceptor complexes that are inactive towards photoreduction. Furthermore, it is shown that the addition of liposomes results in a decrease in photoproduct inhibition, which is caused by repulsion of the reduced electron acceptor by the photocatalytic site."

According to the news editors, the research concluded: "Thus, liposomes can be used as a support to perform efficient photocatalysis; the charged photoproducts are pushed away from the liposomes and represent 'soluble electrons' that can be physically separated from the place where they were generated."

For more information on this research see: Enhanced Photoinduced Electron Transfer at the Surface of Charged Lipid Bilayers. Chemistry-A European Journal, 2014;20(29):8965-8972. Chemistry-A European Journal can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany (see also Biotechnology).

The news editors report that additional information may be obtained by contacting B. Limburg, Leiden University, Leiden Inst Chem, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands. Additional authors for this research include G. Laisne, E. Bouwman and S. Bonnet.

Keywords for this news article include: Biotechnology, Leiden, Europe, Liposomes, Netherlands, Photocatalyst, Nanotechnology, Photocatalytic, Emerging Technologies

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Source: Biotech Week

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