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|Title:||Excited-state intramolecular hydrogen atom transfer of curcumin in surfactant micelles|
|Citation:||Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, 2010; 114(8):2997-3004|
|Publisher:||Amer Chemical Soc|
|Ramkrishna Adhikary, Philip J. Carlson, Tak W. Kee and Jacob W. Petrich|
|Abstract:||Femtosecond fluorescence upconversion experiments were performed on the naturally occurring medicinal pigment, curcumin, in anionic, cationic, and neutral micelles. In our studies, the micelles are composed of sodium dodecyl sulfate (SDS), dodecyl trimethyl ammonium bromide (DTAB), and triton X-100 (TX-100). We demonstrate that the excited-state kinetics of curcumin in micelles have a fast (3-8 ps) and slow (50-80 ps) component. While deuteration of curcumin has a negligible effect on the fast component, the slow component exhibits a pronounced isotope effect of approximately 1.6, indicating that micelle-captured curcumin undergoes excited-state intramolecular hydrogen atom transfer. Studies of solvation dynamics of curcumin in a 10 ps time window reveal a fast component (< or = 300 fs) followed by a 8, 6, and 3 ps component in the solvation correlation function for the TX-100, DTAB, and SDS micelles, respectively.|
|Keywords:||Hydrogen; Sodium Dodecyl Sulfate; Octoxynol; Curcumin; Surface-Active Agents; Spectrometry, Fluorescence; Spectrophotometry, Ultraviolet; Micelles; Time Factors; Quaternary Ammonium Compounds|
|Rights:||Copyright © 2010 American Chemical Society|
|Appears in Collections:||Physics publications|
Environment Institute publications
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