title: An efficient method for recovery of target ssDNA based on amino-modified silica-coated magnetic nanoparticles.
abstract: In this paper, an improved recovery method for target ssDNA using amino-modified silica-coated magnetic nanoparticles (ASMNPs) is reported. This method takes advantages of the amino-modified silica-coated magnetic nanoparticles prepared using water-in-oil microemulsion technique, which employs amino-modified silica as the shell and iron oxide as the core of the magnetic nanoparticles. The nanoparticles have a silica surface with amino groups and can be conjugated with any desired bio-molecules through many existing amino group chemistry. In this research, a linear DNA probe was immobilized onto nanoparticles through streptavidin conjugation using covalent bonds. A target ssDNA(I) (5'-TMR-CGCATAGGGCCTCGTGATAC-3') has been successfully recovered from a crude sample under a magnet field through their special recognition and hybridization. A designed ssDNA fragment of severe acute respiratory syndrome (SARS) virus at a much lower concentration than the target ssDNA(I) was also recovered with high efficiency and good selectivity.
authors.affiliation: Biomedical Engineering Center, State Key Laboratory of Chemo/Biosensing and Chemometrics, Institute of Life Science and Biological Technology, Hunan University & Engineering Research Center for Bio-Nanotechnology of Hunan Province, Changsha 410082, PR China.
authors.forename: Parviz
authors.initials: P
authors.lastname: Ashtari
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: He
authors.forename: Kemin
authors.initials: K
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Gong