10.1039/c3cc40330k
The research aimed to synthesize and investigate the optical properties of water-soluble, perylenediimide-cored cationic dendrimers with peripheral amine groups, designed for potential applications in gene transfection and biological imaging. The purpose was to enhance the water solubility and fluorescence of perylenediimides (PDIs), which are known for their stability and high fluorescence in organic solvents but aggregate and become less fluorescent in water. The researchers synthesized different generations of PDI-cored dendrimers, which were characterized by a central fluorescent PDI chromophore, degradable dendritic polyesters, and peripheral primary amines that provided positive charges after treatment with dilute hydrochloric acid. The chemicals used in the synthesis process included amine-functionalized PDI, 2-methacryloyloxyethyl acrylate (MAEA), cysteamine (CA), and dimethyl sulfoxide (DMSO) as an accelerator. The study concluded that increasing the dendrimer generation enhanced gene transfection efficiency, with the highest efficiency observed in the third-generation dendrimer (G3), attributed to its larger outer branches and more positive charges. These dendrimers demonstrated rapid internalization into live cells, high gene transfection efficacy, and low cytotoxicity, making them promising candidates for gene therapy applications.