کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1176482 | 1491412 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Quantitative DNA hybridization in solution using magnetic/luminescent core–shell nanoparticles Quantitative DNA hybridization in solution using magnetic/luminescent core–shell nanoparticles](/preview/png/1176482.png)
Nanoscale magnetic/luminescent core–shell particles were used for DNA quantification in a hybridization-in-solution approach. We demonstrated a rapid, simple, and non-polymerase chain reaction-based DNA hybridization-in-solution assay for quantifying bacteria capable of biodegrading methyl tertiary-butyl ether. Fe3O4/Eu:Gd2O3 core–shell nanoparticles synthesized by spray pyrolysis were biofunctionalized with NeutrAvidin. Following immobilization of a biotinylated probe DNA on the particles’ surfaces via passive adsorption, target DNA labeled with fluorescein isothiocyanate was hybridized with probe DNA. The hybridized DNA complex was separated from solution with a magnet, while nonhybridized DNA remained in solution. The normalized fluorescence (fluorescein isothiocyanate/nanoparticles) measured with a spectrofluorometer indicated a linear quantification (R2 = 0.98) of the target bacterial 16 S rDNA. The rate of hybridization increased concurrently with the target DNA concentration. In addition, this approach differentiated between the signal outputs from perfectly complementary target and two-base mismatched target DNA in a range of concentrations, showing the specificity of the assay and the possibility for environmental applications.
Journal: Analytical Biochemistry - Volume 370, Issue 2, 15 November 2007, Pages 186–194