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New Biological Pigments Findings from King Abdullah University of Science and Technology Outlined (Remarkable Fluorescence Enhancement versus Complex...

July 22, 2014



New Biological Pigments Findings from King Abdullah University of Science and Technology Outlined (Remarkable Fluorescence Enhancement versus Complex Formation of Cationic Porphyrins on the Surface of ZnO Nanoparticles)

By a News Reporter-Staff News Editor at Life Science Weekly -- New research on Biological Factors is the subject of a report. According to news reporting originating in Thuwal, Saudi Arabia, by NewsRx journalists, research stated, "Fluorescence enhancement of organic fluorophores shows tremendous potential to improve image contrast in fluorescence-based bioimaging. Here, we present an experimental study of the interaction of two cationic porphyrins, meso-tetrakis (1-methylpyridinium-4-yl)porphyrin chloride (TMPyP) and meso-tetrakis(4-N,N,N-trimethylanilinium)porphyrin chloride (TMAP), with cationic surfactant-stabilized zinc oxide nanoparticles (ZnO NPs) based on several steady-state and time-resolved techniques."

The news reporters obtained a quote from the research from the King Abdullah University of Science and Technology, "We show the first experimental measurements demonstrating a clear transition from pronounced fluorescence enhancement to charge transfer (CT) complex formation by simply changing the nature and location of the positive charge of the meso substituent of the cationic porphyrins. For TMPyP, we observe a sixfold increase in the fluorescence intensity of TMPyP upon addition of ZnO NPs. Our experimental results indicate that the electrostatic binding of TMPyP with the surface of ZnO NPs increases the symmetry of the porphyrin macrocycle. This electronic communication hinders the rotational relaxation of the meso unit and/or decreases the intramolecular CT character between the cavity and the meso substituent of the porphyrin, resulting in the enhancement of the intensity of the fluorescence. For TMAP, on the other hand, the different type and nature of the positive charge resulting in the development of the CT band arise from the interaction with the surface of ZnO NPs."

According to the news reporters, the research concluded: "This observation is confirmed by the femtosecond transient absorption spectroscopy, which provides clear spectroscopic signatures of photoinduced electron transfer from TMAP to ZnO NPs."

For more information on this research see: Remarkable Fluorescence Enhancement versus Complex Formation of Cationic Porphyrins on the Surface of ZnO Nanoparticles. Journal of Physical Chemistry C, 2014;118(23):12154-12161. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)

Our news correspondents report that additional information may be obtained by contacting S.M.B. Aly, King Abdullah Univ Sci & Technol, Solar & Photovolta Engn Res Center, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia. Additional authors for this research include M. Eita, J.I. Khan, E. Alarousu and O.F. Mohammed (see also Biological Factors).

Keywords for this news article include: Asia, Thuwal, Porphyrins, Zinc Oxide, Saudi Arabia, Nanoparticle, Nanotechnology, Biological Factors, Biological Pigments, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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