Low molecular weight polyethyleneimines were conjugated onto gold nanoparticles to form Au-PEI conjugates. Au-PEI is the first reported gene carrier which has both high transfection efficiency and strong fluorescence. Au-PEI showed higher transfection efficiency and it can be used for bioimaging because it can be detected by confocal laser scanning microscopy and in vivo bioimaging system.
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Tian et al. (2012) studied this question.
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