scholarly journals Antioxidant effects of carotenoids in a model pigment-protein complex.

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Joanna Fiedor ◽  
Aleksandra Sulikowska ◽  
Aleksandra Orzechowska ◽  
Leszek Fiedor ◽  
Květoslava Burda
Keyword(s):  
Protein Complexes ◽  
Photosynthetic Pigment ◽  
Chemical Oxidation ◽  
Antioxidant Effect ◽  
Absorption And Fluorescence Spectroscopy ◽  
Pigment Protein Complexes ◽  
Photosynthetic Complexes ◽  
The Stability ◽  
Pigment Protein Complex ◽  
Antioxidant Effects

The effect of carotenoids on stability of model photosynthetic pigment-protein complexes subjected to chemical oxidation with hydrogen peroxide or potassium ferricyanide was investigated. The oxidation of carotenoid-less and carotenoid-containing complexes was conducted in the presence or absence of ascorbic acid. The progress of the reactions was monitored by use of absorption and fluorescence spectroscopy. Our results show that carotenoids may significantly enhance the stability of photosynthetic complexes against oxidation and their protective (antioxidant) effect depends on the type of the oxidant.

scholarly journals Silver Island Film for Enhancing Light Harvesting in Natural Photosynthetic Proteins

2020 ◽  
Vol 21 (7) ◽  
pp. 2451 ◽  
Author(s):  
Dorota Kowalska ◽  
Marcin Szalkowski ◽  
Karolina Sulowska ◽  
Dorota Buczynska ◽  
Joanna Niedziolka-Jonsson ◽  
...  
Keyword(s):  
Light Harvesting ◽  
Protein Complexes ◽  
Photosynthetic Pigment ◽  
Functional Materials ◽  
Photosynthetic Reaction Centers ◽  
Light Harvesting Complexes ◽  
Pigment Protein Complexes ◽  
Chlorophyll Protein ◽  
Silver Island ◽  
Photosynthetic Complexes

The effects of combining naturally evolved photosynthetic pigment–protein complexes with inorganic functional materials, especially plasmonically active metallic nanostructures, have been a widely studied topic in the last few decades. Besides other applications, it seems to be reasonable using such hybrid systems for designing future biomimetic solar cells. In this paper, we describe selected results that point out to various aspects of the interactions between photosynthetic complexes and plasmonic excitations in Silver Island Films (SIFs). In addition to simple light-harvesting complexes, like peridinin-chlorophyll-protein (PCP) or the Fenna–Matthews–Olson (FMO) complex, we also discuss the properties of large, photosynthetic reaction centers (RCs) and Photosystem I (PSI)—both prokaryotic PSI core complexes and eukaryotic PSI supercomplexes with attached antenna clusters (PSI-LHCI)—deposited on SIF substrates.

Two-photon excitation spectroscopy of photosynthetic light-harvesting complexes and pigments

2019 ◽  
Vol 216 ◽  
pp. 494-506 ◽  
Author(s):  
Alexander Betke ◽  
Heiko Lokstein
Keyword(s):  
Spectral Region ◽  
Protein Complexes ◽  
Photosynthetic Pigment ◽  
Photon Absorption ◽  
Light Harvesting Complexes ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Pigment Protein Complexes ◽  
Two Photon Excitation

Two-photon excitation (TPE) profiles of LHCII samples containing different xanthophyll complements were measured in the presumed 11Ag− → 21Ag− (S0 → S1) transition region of xanthophylls. Additionally, TPE profiles of Chls a and b in solution and of WSCP, which does not contain carotenoids, were measured. The results indicate that direct two-photon absorption by Chls in the presumed S0 → S1 transition spectral region of carotenoids is dominant over that of carotenoids, with negligible contributions of the latter. These results suggest the re-evaluation of previously published TPE data obtained with photosynthetic pigment–protein complexes containing (B)Chls and carotenoids.

Redox Conditions Affect Ultrafast Exciton Transport in Photosynthetic Pigment–Protein Complexes

2017 ◽  
Vol 9 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Marco A. Allodi ◽  
John P. Otto ◽  
Sara H. Sohail ◽  
Rafael G. Saer ◽  
Ryan E. Wood ◽  
...  
Keyword(s):  
Protein Complexes ◽  
Photosynthetic Pigment ◽  
Redox Conditions ◽  
Exciton Transport ◽  
Pigment Protein Complexes
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