|
|||||
|
|
Ultrafast energy transfer from 3-mercaptopropionic acid-capped CdSe/ZnS QDs to dye-labelled DNA |
|
| Authors: | S Shankara Narayanan Sudarson Sekhar Sinha Pramod Kumar Verma Samir Kumar Pal |
| Institution: | aUnit for Nano Science and Technology, Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098, India |
| Abstract: | Femtosecond-resolved fluorescence upconversion and picosecond-resolved spectroscopic measurements have been employed to confirm a highly efficient ultrafast FRET from MPA-capped CdSe/ZnS QDs to dye molecules attached to dodecamer DNA. It appears that hydrogen bonding is the associative mechanism between the MPA-capped QDs and DNA. High FRET efficiency of 92% together with the estimated donor–acceptor distance suggests that the adsorptive interactions between DNA and MPA-capped QDs result in a conformation in which DNA lies along the surface of the QD. Circular dichroism studies have been performed which reveal some perturbation in the native B-form of DNA in the nanobioconjugate. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |