Fluorescent aptasensors are reliant on static fluorescence intensity measurements, which suffer drawbacks such as background interference and laborious separation procedures. A unique aptasensor based on the photochrome aptamer switch assay (PHASA) has been developed that is independent of background fluorescence, requires no analyte separation, and allows rapid quantification within seconds. Malachite green aptamer (MGA) conjugated with a water-soluble stilbene on the MGA 3′ C38 terminus was chosen for building the proof-of-concept aptasensor. In the presence of malachite green and tetramethylrosamine ligands, the rate of the stilbene fluorescence decay was found to be linearly dependent on the ligand concentration. Molecular dynamic simulation suggests hydrogen bonding between stilbene sulfonates and neighboring nucleotides is the primary mechanism responsible for rate changes in stilbene photoisomerization. Analysis of the apparent fluorescence decay rate (kapp) versus analyte concentration gives a limit of detection (LOD) of 2 μM for MG and 0.6 μM for TMR. This aptasensor design opens up a new sensing mode, which is promising for rapid development of SELEX generated molecular recognition elements.
Bibliographical noteFunding Information:
The work was supported by the Ministry of Education Tier 1 Grant RG54/13: “Photochrome Aptamer Switch Assay: A Universal Bioassay Device” . This research was also supported by the Campus for Research Excellence and Technological Enterprise (CREATE) programme (13-04-00364 А), which is supported by the National Research Foundation , Prime Minister’s Office, Singapore . Appendix A
- Fluorescence decay
- Malachite green