Based on this method, PAMAM dendrimer/DNA complexes were used to encapsulate functional biodegradable polymer films for substrate-mediated gene delivery. Research has shown that the fast-degrading functional polymer has great potential for localized transfection [65–67]. Dendrimers
as magnetic resonance imaging contrast agents P505-15 Dendrimer-based metal chelates act as magnetic resonance imaging contrast agents. Dendrimers are extremely appropriate and used as image contrast media because of their properties [56]. Dendritic sensors Dendrimers, although are single molecules, can contain high numbers of functional groups on their surfaces. This makes them striking for applications where the covalent connection or close proximity of a high number Quisinostat supplier of species is important. Balzani and coworkers investigated the fluorescence of a
fourth-generation GS-1101 chemical structure poly (propylene amine) dendrimer decorated with 32 dansyl units at the periphery (Figure 8) [68]. Since the dendrimer contains 30 aliphatic amine units in the interior, suitable metal ions are able to coordinate. It was observed that when a Co2+ ion is incorporated into the dendrimer, the strong fluorescence of all the dansyl units is quenched. Low concentrations of Co2+ ions (4.6 × 10-7 M) can be detected using a dendrimer concentration of 4.6 × 10-6 M. The many fluorescent groups on the surface serve to amplify the sensitivity of the dendrimer as a sensor [69]. Figure 8 Poly (propylene amine) dendrimer, containing 32 dansyl units at its periphery. Dendrimers used for enhancing solubility PAMAM dendrimers are expected to have potential applications in enhancing solubility for drug delivery systems. Dendrimers have hydrophilic exteriors and interiors, which are responsible for its unimolecular micelle nature. Dendrimer-based carriers offer the opportunity to enhance the oral bioavailability of problematic drugs. Thus, dendrimer nano carriers offer the potential to enhance
the bioavailability of drugs that are poorly soluble and/or substrates Megestrol Acetate for efflux transporters [70, 71]. Photodynamic therapy Photodynamic therapy (PDT) relies on the activation of a photosensitizing agent with visible or near-infrared (NIR) light. Upon excitation, a highly energetic state is formed which, upon reaction with oxygen, affords a highly reactive singlet oxygen capable of inducing necrosis and apoptosis in tumor cells. Dendritic delivery of PDT agents has been investigated within the last few years in order to improve upon tumor selectivity, retention, and pharmacokinetics [72–75]. Miscellaneous dendrimer applications Clearly, there are many other areas of biological chemistry where application of dendrimer systems may be helpful. Cellular delivery using carrier dendritic polymers is used in the purification of water dendrimer-based product in cosmetics contaminated by toxic metal ion and inorganic solute, and dendrimer-based commercial products organic solutes [76].