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Materials 2018, 11(1), 28; doi:10.3390/ma11010028

Detection of Singlet Oxygen Formation inside Photoactive Biohybrid Composite Material

1
Institute of Medical Physics and Informatics, University of Szeged, Rerrich B. sq. 1, 6720 Szeged, Hungary
2
Isotope Climatology and Environmental Research Centre (ICER), Institute for Nuclear Research, Hungarian Academy of Sciences, Bem tér 18/c, 4026 Debrecen, Hungary
3
Biological Research Center of the Hungarian Academy of Sciences, Institute of Plant Biology, Temesvári krt 62, 6726 Szeged, Hungary
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 27 November 2017 / Accepted: 21 December 2017 / Published: 26 December 2017
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Abstract

Photosynthetic reaction center proteins (RCs) are the most efficient light energy converter systems in nature. The first steps of the primary charge separation in photosynthesis take place in these proteins. Due to their unique properties, combining RCs with nano-structures promising applications can be predicted in optoelectronic systems. In the present work RCs purified from Rhodobacter sphaeroides purple bacteria were immobilized on multiwalled carbon nanotubes (CNTs). Carboxyl—and amine-functionalised CNTs were used, so different binding procedures, physical sorption and chemical sorption as well, could be applied as immobilization techniques. Light-induced singlet oxygen production was measured in the prepared photoactive biocomposites in water-based suspension by histidine mediated chemical trapping. Carbon nanotubes were applied under different conditions in order to understand their role in the equilibration of singlet oxygen concentration in the suspension. CNTs acted as effective quenchers of 1O2 either by physical (resonance) energy transfer or by chemical (oxidation) reaction and their efficiency showed dependence on the diffusion distance of 1O2. View Full-Text
Keywords: photoactive nanocomposites; singlet oxygen; photosynthetic reaction center; multiwalled carbon nanotubes photoactive nanocomposites; singlet oxygen; photosynthetic reaction center; multiwalled carbon nanotubes
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Hajdu, K.; Ur Rehman, A.; Vass, I.; Nagy, L. Detection of Singlet Oxygen Formation inside Photoactive Biohybrid Composite Material. Materials 2018, 11, 28.

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