By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Antioxidants have been published. According to news originating from New York City, New York, by NewsRx correspondents, research stated, "The chloroplast contains densely stacked arrays of light-harvesting proteins that harness solar energy with theoretical maximum glucose conversion efficiencies approaching 12%. Few studies have explored isolated chloroplasts as a renewable, abundant, and low cost source for solar energy harvesting."
Our news journalists obtained a quote from the research from Molecular Pharmacology and Chemistry Program, "One impediment is that photoactive proteins within the chloroplast become photodamaged due to reactive oxygen species (ROS) generation. In vivo, chloroplasts reduce photodegradation by applying a self-repair cycle that dynamically replaces photodamaged components; outside the cell, ROS-induced photodegradation contributes to limited chloroplast stability. The incorporation of chloroplasts into synthetic, light-harvesting devices will require regenerative ROS scavenging mechanisms to prolong photoactivity. Herein, we study ROS generation within isolated chloroplasts extracted from Spinacia oleracea directly interfaced with nanoparticle antioxidants, including dextran-wrapped nanoceria (dNC) previously demonstrated as a potent ROS scavenger. We quantitatively examine the effect of dNC, along with cerium ions, fullerenol, and DNA-wrapped single-walled carbon nanotubes (SWCNTs), on the ROS generation of isolated chloroplasts using the oxidative dyes, 2',7'- dichlorodihydrofluorescein diacetate (H2DCF-DA) and 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide sodium salt (XTT). Electrochemical measurements confirm that chloroplasts processed from free solution can generate power under illumination."
According to the news editors, the research concluded: "We find dNC to be the most effective of these agents for decreasing oxidizing species and superoxide concentrations whilst preserving chloroplast photoactivity at concentrations below 5 M, offering a promising mechanism for maintaining regenerative chloroplast photoactivity for light-harvesting applications."
For more information on this research see: Application of Nanoparticle Antioxidants to Enable Hyperstable Chloroplasts for Solar Energy Harvesting. Advanced Energy Materials, 2013;3(7):881-893. Advanced Energy Materials can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell - www.wiley.com/; Advanced Energy Materials - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1614-6840)
The news correspondents report that additional information may be obtained from A.A. Boghossian, Mem Sloan Kettering Canc Center, Mol Pharmacol & Chem Program, New York, NY 10065, United States. Additional authors for this research include F. Sen, B.M. Gibbons, S. Sen, S.M. Faltermeier, J.P. Giraldo, C.T. Zhang, J.Q. Zhang, D.A. Heller and M.S. Strano (see also Antioxidants).
Keywords for this news article include: Antioxidants, New York City, United States, Protective Agents, North and Central America
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