Diffusive Thermoprobe

Product#: FDV-0002
Ships in 1-2 weeks

Diffusive Thermoprobe

Cat. No. FDV-0002
Size 100ug
Storgae RT


Diffusive Thermoprobe is a fluorescent polymeric thermometer for living cells. It diffuses throughout cells and gives information about intracellular temperature distribution via fluorescence lifetime imaging microscopy. 

Ultrasensitive Fluorescent Thermometer for cellular temperature monitoring. The "Diffusive Thermoprobe" Useful Tools to monitor intracellular temparature

This product is licensed by Tokyo University.


  • The Diffusive Thermoprobe is a fluorescent polymeric thermometer.
    It enables us to monitor intracellular temperatures near mitochondria, Golgi body etc.
  • Fluorescence lifetime imaging microscopy is required for measuring intracellular temparatures following microinjection into cells.
  • The spatial and temperature resolutions of the Diffusive Thermoprobe are at the diffraction limited level (200 nm) and 0.18 – 0.5C.
  • Diffusive Thermoprobe is not affected by cellular environmental conditions such as pH, ionic strength, protein etc.

Structure & Functional diagram


  • At low temperatures, a thermoresponsive poly-N-n-proplylacrylamide (NNPAM) sequence in Diffusive Thermoprobe assumes an extended structure with hydration of amide linkages, in which a water-sensitive N-{2-[(7-N, N-dimethylaminosulfonyl)-2, 1, 3-benzoxadiazol-4-yl](methyl)amino}ethyl-Nmethylacrylamide (DBD-AA) unit can be quenched by neighbouring water molecules.
  • At higher temperatures, which weaken hydration, the polyNNPAM sequence shrinks because of the hydrophobic interaction among the NNPAM units, resulting in the release of water molecules and strong fluorescence from the DBD-AA unit.
  • An ionic potassium 3-sulfopropyl acrylate (SPA) unit enriches the hydrophilicity of Diffusive Thermoprobe to prevent interpolymeric aggregation within a cell.

Example Data


Temperature mapping in living COS7 cells Confocal fluorescence image (left) and fluorescence lifetime image (right) of Diffusive Thermoprobe.


Local heat production near the mitochondria in living COS7 cells

  • Temperatures increase near the mitochondria after the inhibition of ATP synthesis by the uncoupler FCCP.
  • Heat production by FCCP resulted in an average temperature increase of 1.02 ± 0.17°C (avg. ± s.d., n = 7) inside COS7 cells 30min after the chemical stimuli.
  • Confocal fluorescence images of Diffusive Thermoprobe (green) and MitoTracker Deep Red FM (red; left) and fluorescence lifetime images of Diffusive Thermoprobe (middle andf right). 
  • Okabe K, et al. Nat Commun. 2012 Feb 28;3:705.
  • Kimura H, et al., Sci Rep, . 2017 7(1):12978.
  • Hoshi Y, et al., J Neurosci. 2018 38(25):5700-5709.
  • Halip H, et al., Methods Appl Fluoresc. 2020 8(2):025003.
  • Kato H, et al., Life Sci Alliance 2020 3(3):e201900576.

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