Abstract
Porous polypropylene (PP) membranes were modified by the plasma treatment in order to graft amino functional group (-NH<sub>2</sub>) onto the membrane surface. Oligonucleotides were in situ synthesized on the aminated polypropylene support. Gold nanoparticle labeled DNAs were bybridized to the synthesized oligonucleotide array. The membranes were exposed to the Silver Enhance Solution for singla amplification. The Hybridization signals of amino plasma-grafted polypropylene membranes were stronger than the commercial polyacrylamide modified polyproplylene membranes that load 0.07 μmol/cm<sup>2</sup> free primary amino functions. Complementary and mismatched sequences were clearly distinguished. The diameter of nanogold particles and the concentration of thiol DNA modified gold nanoparticles were investigated to improve the hybridization signals. Bigger nanoparticle diameter, as well as higher concentration of thiol DNA modified gold nanoparticles lead to stronger hybridization signals.
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