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A 'green' synthesis for encapsulating PbSe nanoparticles with soluble starch at room temperature has been demonstrated. The structural and thermal properties of the nanoparticles have been investigated. TEM micrographs showed that the particles were cubical to spheroid in shape and the average size of the particles was 25 nm. The starch coating onto the nanoparticles did not affect the morphology of the cells in our in vitro studies indicating the coating was biocompatible and nontoxic. Our cytotoxicity studies showed that the biocompatibility was enhanced when the nanoparticles were coated with starch and PbSe starch nanoparticles could provide greater cell viability even at particle loading as high as 100 μg/ml. Refereed/Peer-reviewed

CdTe/CdSe quantum dots (QDs) embedded gelatin nanoparticles were synthesized via aqueous method. The morphology of the nanoparticles was characterized by transmission electron microscope (TEM) and the average size of QD/gelatin nanoparticles was 50 nm in size. The luminescent properties of these nanoparticles were studied by using fluorescence spectrophotometry and fluorescence microscopy. The nanoparticles was used for imaging cell lines such as GI-1, MCF 7, HUVEC, L929 and biocompatibility of nanoparticles was studied and found that the gelatin coated QDs are highly compatible even at higher concentrations of nanoparticles. Our results identify that biopolymer coated nanoparticles are expected to be ideal candidates for in vivo biological imaging studies. © 2011 by American Scientific Publishers All rights reserved. Refereed/Peer-reviewed