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Plos One : Photosynthetic Electron Transport System Promotes Synthesis of Au-nanoparticles, Volume 8

By Lebedev, Nikolai

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Book Id: WPLBN0003964672
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Photosynthetic Electron Transport System Promotes Synthesis of Au-nanoparticles, Volume 8  
Author: Lebedev, Nikolai
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection
Historic
Publication Date:
Publisher: Plos

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Lebedev, N. (n.d.). Plos One : Photosynthetic Electron Transport System Promotes Synthesis of Au-nanoparticles, Volume 8. Retrieved from http://netlibrary.net/


Description
Description : In this communication, a novel, green, efficient and economically viable light mediated protocol for generation of Aunanoparticles using most vital organelle, chloroplasts, of the plant system is portrayed. Thylakoids/chloroplasts isolated from Potamogeton nodosus (an aquatic plant) and Spinacia oleracea (a terrestrial plant) turned Au3+ solutions purple in presence of light of 600 mmol m22 s21 photon flux density (PFD) and the purple coloration intensified with time. UV-Vis spectra of these purple colored solutions showed absorption peak at ,545 nm which is known to arise due to surface plasmon oscillations specific to Au-nanoparticles. However, thylakoids/chloroplasts did not alter color of Au3+ solutions in dark. These results clearly demonstrated that photosynthetic electron transport can reduce Au3+ to Au0 which nucleate to form Au-nanoparticles in presence of light. Transmission electron microscopic studies revealed that Au-nanoparticles generated by light driven photosynthetic electron transport system of thylakoids/chloroplasts were in range of 5–20 nm. Selected area electron diffraction and powder X-ray diffraction indicated crystalline nature of these nanoparticles. Energy dispersive X-ray confirmed that these nanoparticles were composed of Au. To confirm the potential of light driven photosynthetic electron transport in generation of Au-nanoparticles, thylakoids/chloroplasts were tested for their efficacy to generate Au-nanoparticles in presence of light of PFD ranging from 60 to 600 mmol m22 s21. The capacity of thylakoids/ chloroplasts to generate Au-nanoparticles increased remarkably with increase in PFD, which further clearly demonstrated potential of light driven photosynthetic electron transport in reduction of Au3+ to Au0 to form nanoparticles. The light driven donation of electrons to metal ions by thylakoids/chloroplasts can be exploited for large scale production of nanoparticles.

 

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