Excited state proton transfer (ESPT) of pyranine (8-hydroxypyrene-1,3,6-trisulfonate, HPTS) in a live Chinese hamster ovary (CHO) cell is studied by time resolved confocal microscopy. The cytoplasm region of the cell is stained by a photoacid, HPTS (HA). The time constant of initial proton transfer (τPT) in the cell is found to be ∼10 times longer than that in bulk water, while the time constants of recombination (τrec) and dissociation (τdiss) in the cell are ∼3 times and ∼2 times longer, respectively. The slower rate of proton transfer (∼10 times) inside the CHO cell compared to that in bulk water is ascribed to slower solvation dynamics, lower availability of free water molecules, and disruption of hydrogen-bond network inside the cell. Translational and rotational diffusion of HPTS inside a single CHO cell have been investigated by fluorescence correlation spectroscopy (FCS) and picosecond anisotropy measurement, respectively. Both the translational and rotational diffusion slow down inside the live cell. FCS studies indicate that HPTS remains tightly bound to a macromolecule inside the cell.
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7 June 2013
Research Article|
June 06 2013
In what time scale proton transfer takes place in a live CHO cell?
Supratik Sen Mojumdar;
Supratik Sen Mojumdar
Department of Physical Chemistry,
Indian Association for the Cultivation of Science
, Jadavpur, Kolkata 700032, India
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Rajdeep Chowdhury;
Rajdeep Chowdhury
Department of Physical Chemistry,
Indian Association for the Cultivation of Science
, Jadavpur, Kolkata 700032, India
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Amit Kumar Mandal;
Amit Kumar Mandal
Department of Physical Chemistry,
Indian Association for the Cultivation of Science
, Jadavpur, Kolkata 700032, India
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Kankan Bhattacharyya
Kankan Bhattacharyya
a)
Department of Physical Chemistry,
Indian Association for the Cultivation of Science
, Jadavpur, Kolkata 700032, India
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a)
E-mail: pckb@iacs.res.in. Fax: (91)-33-2473-2805.
J. Chem. Phys. 138, 215102 (2013)
Article history
Received:
February 22 2013
Accepted:
May 14 2013
Citation
Supratik Sen Mojumdar, Rajdeep Chowdhury, Amit Kumar Mandal, Kankan Bhattacharyya; In what time scale proton transfer takes place in a live CHO cell?. J. Chem. Phys. 7 June 2013; 138 (21): 215102. https://doi.org/10.1063/1.4807862
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