PMID- 24298991 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20140806 LR - 20131227 IS - 1520-5207 (Electronic) IS - 1520-5207 (Linking) VI - 117 IP - 51 DP - 2013 Dec 27 TI - Stimulated emission properties of fluorophores by CW-STED single molecule spectroscopy. PG - 16405-15 LID - 10.1021/jp409330t [doi] AB - Fluorophores useful for STimulated Emission Depletion (STED) spectroscopy must fulfill strict requirements on depletion efficiency and photostability. These parameters determine the effective resolution of STED imaging. Resolution is typically measured on 30-80 nm spheres heavily decorated with STED bright fluorophores, limiting the possibility to estimate the true resolution achievable on a specific dye. Here we show how single molecule STED microscopy provides an estimate of the fluorophore stimulated emission cross section and of its photostability under STED irradiation. Fluorescein, a green and a yellow mutant of GFP, are tested, and the results are discussed and compared to those obtained with Chromeo488-covered 80 nm spheres on a commercial continuous-wave STED microscope. FAU - Bouzin, Margaux AU - Bouzin M AD - Physics Department, Universita degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy. FAU - Chirico, Giuseppe AU - Chirico G FAU - D'Alfonso, Laura AU - D'Alfonso L FAU - Sironi, Laura AU - Sironi L FAU - Soavi, Giancarlo AU - Soavi G FAU - Cerullo, Giulio AU - Cerullo G FAU - Campanini, Barbara AU - Campanini B FAU - Collini, Maddalena AU - Collini M LA - eng PT - Journal Article DEP - 20131212 PL - United States TA - J Phys Chem B JT - The journal of physical chemistry. B JID - 101157530 EDAT- 2013/12/05 06:00 MHDA- 2013/12/05 06:01 CRDT- 2013/12/05 06:00 PHST- 2013/12/05 06:00 [entrez] PHST- 2013/12/05 06:00 [pubmed] PHST- 2013/12/05 06:01 [medline] AID - 10.1021/jp409330t [doi] PST - ppublish SO - J Phys Chem B. 2013 Dec 27;117(51):16405-15. doi: 10.1021/jp409330t. Epub 2013 Dec 12.