Document Detail

Effect of pressure and solvent on Raman spectra of all-trans-beta-carotene.
MedLine Citation:
PMID:  17880189     Owner:  NLM     Status:  MEDLINE    
The ground state Raman spectra of all-trans-beta-carotene in n-hexane and CS2 solutions are measured by simultaneously changing the solvent environment and molecular structure under high hydrostatic pressure. The diverse pressure dependencies of several representative Raman bands are explained using a competitive mechanism involving bond length changes and vibronic coupling. It is therefore concluded that (a) the in-phase C=C stretching mode plays an essential role in the conversion of energy from S1 to S0 states in carotenoids, (b) internal conversion and intramolecular vibrational redistribution can be accelerated by high pressure, and (c) the environmental effect, but not the structural distortion or pi-electron delocalization, is responsible for the spectral properties of a given carotenoid species. These findings revealed the potential of high pressure in exploring the nature of the biological functions of carotenoids.
Wei-Long Liu; Zhi-Ren Zheng; Rui-Bin Zhu; Zhi-Guo Liu; Da-Peng Xu; Hua-Min Yu; Wen-Zhi Wu; Ai-Hua Li; Yan-Qiang Yang; Wen-Hui Su
Related Documents :
15784329 - Effect of pressure on the prodan fluorescence in bilayer membranes of phospholipids wit...
19787639 - High-pressure systems for gas-phase free continuous incubation of enriched marine micro...
22231229 - Effects of high hydrostatic pressure on color of spinach purée and related properties.
17550289 - High-pressure potato starch granule gelatinization: synchrotron radiation micro-saxs/wa...
2519649 - Long-term storage of eggs of simulium ornatum.
12241369 - Piezoelectricity of a ferroelectric liquid crystal with a glass transition.
10642299 - Angiotensin i-converting enzyme antisense prevents altered renal vascular reactivity, b...
11983389 - High pressure static fluorescence to study macromolecular structure-function.
3578729 - Spurious central venous pressure.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-09-20
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  111     ISSN:  1089-5639     ISO Abbreviation:  J Phys Chem A     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-04     Completed Date:  2007-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  10044-9     Citation Subset:  IM    
Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Biophysics / methods
Carotenoids / chemistry
Chemistry, Physical / methods
Hexanes / chemistry
Models, Chemical
Models, Statistical
Spectrometry, Fluorescence / methods
Spectrum Analysis, Raman / methods*
beta Carotene / chemistry*
Reg. No./Substance:
0/Hexanes; 36-88-4/Carotenoids; 7235-40-7/beta Carotene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Variational calculation of specific, highly excited vibrational states in DFCO: comparison with expe...
Next Document:  Optimized geometry of the cluster Gd2O3 and proposed antiferromagnetic alignment of f-electron magne...