✦ LIBER ✦
Observation of conformational relaxation hindrance in the singlet excited state for porphyrin incorporated in a lipid membrane
✍ Scribed by M.V. Anikin; V.V. Borovkov; A. Ishida; K. Wasa; Y. Sakata
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 623 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The behavior of two free base porphyrins, 5,10,15,20-tetrakis(ptolyl)porphine (TTP) and 5,10,15,20-tetrakis( 3,5-di-tertbutylphenyl)porphine (TBP), incorporated into dipalmitoyl-phosphatidylcholine membranes has been comparatively studied by steady-state fluorescence spectroscopy. TBP in the membrane interior, in contrast to TTP, showed pronounced decrease of Stokes shift and displacement of Q bands toward shorter wavelengths due to the restriction of its conformational freedom caused by the interaction of tert-butyl residues with ordered lipid hydrocarbon chains.