Two-dimensional densely packed DNA nanostructure derived from DNA complexation with a low-generation poly(amidoamine) dendrimer.
One of the keys for using deoxyribonucleic acid (DNA) as a nanomaterial relies on how the individual DNA chain can be aligned and how a multitude of DNA chains can be packed into ordered nanostructures. Here we present a simple method for constructing a 2-D densely packed DNA nanostructure using the electrostatic complex of DNA with a poly(amidoamine) (PAMAM) dendrimer of generation two. Ordered DNA arrays are formed by drop-casting an aqueous solution containing positively overcharged complexes onto mica followed by a prolonged incubation. During the incubation, the complexes tend to adsorb onto the negatively charged mica surface through electrostatic attraction. The rodlike complexes organize to form ordered arrays to increase the surface density of the adsorbed complexes and hence the attractive free energy of adsorption. The densely packed nanostructure obtained here is distinguished from the previously reported spheroid or toroid structure derived from DNA complexations with the higher-generation dendrimers.
Su
Chun-Jen
CJ
Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 30013, Taiwan.
Liu
Yi-Chun
YC
Chen
Hsin-Lung
HL
Li
Yen-Cheng
YC
Lin
Hsien-Kuang
HK
Liu
Wen-Liang
WL
Hsu
Chain-Shu
CS
D000588:Amines / Q000737:chemistry; D004247:DNA / Q000737:chemistry*; D050091:Dendrimers / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D055672:Static Electricity
D000588:Amines; D050091:Dendrimers; D011108:Polymers; D004247:DNA