Transient State Imaging for Microenvironmental Monitoring by Laser Scanning Microscopy
2008 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 80, no 24, 9589-9596 p.Article in journal (Refereed) Published
Photoinduced transient dark states are exhibited by practically all common fluorophores. These relatively long-lived states are very sensitive to the local environment and thus highly attractive for microenvironmental imaging purposes. However, because of methodological constraints, their sensitivity has to date been very sparsely exploited. Here, a concept based on spatio-temporal modulation of the excitation intensity is presented that can image these states via their photodynamic fingerprints. With the use of a standard laser scanning microscope, it unites the outstanding environmental sensitivity of the transient state parameters with the high sensitivity of the fluorescence readout and is easily implemented. For demonstration, triplet state images of liposomes with different internal environments were generated. These images provide an example of bow local environmental differences can be resolved, which are not clearly distinguishable via other fluorescence parameters. Having minor instrumental and sample constraints the concept can be foreseen to provide several new, useful, and independent fluorescence-based parameters in biomolecular imaging.
Place, publisher, year, edition, pages
Washington, DC: American Chemical Society , 2008. Vol. 80, no 24, 9589-9596 p.
fluorescence correlation spectroscopy; absorption-spectroscopy; phosphorescence; dynamics
IdentifiersURN: urn:nbn:se:kth:diva-10236DOI: 10.1021/ac8018735ISI: 000261728900027ScopusID: 2-s2.0-58149234147OAI: oai:DiVA.org:kth-10236DiVA: diva2:212156
QC 201008052009-04-212009-04-212010-12-07Bibliographically approved