PMID- 17441054
OWN - NLM
STAT- MEDLINE
DCOM- 20070531
LR  - 20131121
IS  - 1861-471X (Electronic)
IS  - 1861-471X (Linking)
VI  - 1
IP  - 1-2
DP  - 2006 Jul 17
TI  - A femtosecond study of excitation-wavelength dependence of solvation dynamics in 
      a vesicle.
PG  - 188-94
AB  - The dependence of fluorescence and solvation dynamics of coumarin 480 (C480) in a 
      dimyristoyl-phosphatidylcholine (DMPC) vesicle on excitation wavelength 
      (lambda(ex)) was studied with femtosecond fluorescence upconversion. The study 
      revealed an ultrafast 1.5-ps component of solvation that was not detected 
      earlier. C480 exhibits pronounced red-edge excitation shift (REES) by 10 nm in a 
      DMPC vesicle. This is due to the microheterogeneity of the lipid vesicle. In 
      lipids, the probe is distributed in different locations with varying static and 
      dynamic electrostatic responses. Solvent relaxation becomes faster and the amount 
      of dynamic Stokes shift decreases with increasing lambda(ex). For excitation at 
      the red end (lambda(ex) = 430 nm), the solvation time was found to be 1.5 ps. 
      However, for excitation at the blue end, (lambda(ex) = 390 nm), there are two 
      substantially slower components of 250 and 2000 ps. It seems that for lambda(ex) 
      = 390 nm, the major contribution to total emission is due to the probe (C480) 
      molecules in the hydrophobic and restricted locations inside the lipid bilayer. 
      Excitation at 430 nm preferentially selects the probe molecules in a highly 
      mobile environment (water pool of the lipid).
FAU - Sen, Pratik
AU  - Sen P
AD  - Physical Chemistry Department, Indian Association for the Cultivation of Science, 
      Jadavpur, Kolkata 700 032, India.
FAU - Ghosh, Subhadip
AU  - Ghosh S
FAU - Mondal, Sudip Kumar
AU  - Mondal SK
FAU - Sahu, Kalyanasis
AU  - Sahu K
FAU - Roy, Durba
AU  - Roy D
FAU - Bhattacharyya, Kankan
AU  - Bhattacharyya K
FAU - Tominaga, Keisuke
AU  - Tominaga K
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Germany
TA  - Chem Asian J
JT  - Chemistry, an Asian journal
JID - 101294643
RN  - 0 (Lipid Bilayers)
RN  - 0 (Solvents)
RN  - U86ZGC74V5 (Dimyristoylphosphatidylcholine)
SB  - IM
MH  - Dimyristoylphosphatidylcholine/chemistry
MH  - Fluorescence
MH  - Lipid Bilayers
MH  - Magnetic Resonance Spectroscopy
MH  - Neutrons
MH  - Scattering, Radiation
MH  - Solvents/*chemistry
MH  - X-Ray Diffraction
EDAT- 2007/04/19 09:00
MHDA- 2007/06/01 09:00
CRDT- 2007/04/19 09:00
PHST- 2007/04/19 09:00 [pubmed]
PHST- 2007/06/01 09:00 [medline]
PHST- 2007/04/19 09:00 [entrez]
AID - 10.1002/asia.200600036 [doi]
PST - ppublish
SO  - Chem Asian J. 2006 Jul 17;1(1-2):188-94. doi: 10.1002/asia.200600036.