Flipper-TR® is a fluorescent probe that specifically targets the plasma membrane of cells and reports membrane tension changes through its fluorescence lifetime changes. It is the most advanced member of the Flipper probes family2,3), which sense changes of the organization of lipid bilayer membranes through changes of the twist angle and polarization between the two twisted dithienothiophenes of the mechanophore. Flipper-TR® spontaneously inserts into the plasma membrane of cells and is only fluorescent when inserted in a lipid membrane. It has a broad absorption and emission spectrum, excitation can be commonly performed with a 488nm laser, while emission is collected between 575 and 625nm. A detailed protocol for staining and FLIM imaging can be found in the datasheet. Flipper-TR® works on a wide range of organisms including bacteria, yeast4) and mammalians1). Probe quantity allows 50 – 200 staining experiments.*
λabs 480 nm
λfl 600 nm
εmax 1.66·104 mol-1·cm-1 (in DMSO)
lifetime 2.8-7 ns
QY 30% (in AcOEt)
Flipper-TR® Abs/Em spectra (Excel format)
1) Colom A, et al: A fluorescent membrane tension probe. Nat Chem, 2018, 10:1118–1125 ().
2) Dal Molin M, et al: Fluorescent flippers for mechanosensitive membrane probes. JACS, 2015, 137:568-571.
3) Soleimanpour S, et al: Headgroup engineering in mechanosensitive membrane probes. Chem Commun (Camb) 2016, 52:14450-14453.
4) Riggi M, et al: Decrease in plasma membrane tension triggers PtdIns(4,5)P2 phase separation to inactivate TORC2, Nat Cell Biol, 2018 Sep; 20 (9): 1043–1051
*Based on the following conditions: 0.5 – 1 ml staining solution / staining experiments with 0.5 – 1 uM probe concentration. The number of staining experiments can be further increased by reducing volume or probe concentration.
Flipper-TR® probe is distributed by Spirochrome under an exclusive license from the University of Geneva, Switzerland and was developed by the NCCR Chemical Biology.