Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin.

Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Research Abstract Details 

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Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Abstract Text:

Robielyn P Ilagan,Ronald L Christensen,Timothy W Chapp,George N Gibson, Pascher,Tomas ,Harry A Frank,

Steady-state absorption and femtosecond time-resolved spectroscopic studies have been carried out on astaxanthin dissolved in CS2, methanol, and acetonitrile, and in purified alpha-crustacyanin. The spectra of the S0 --> S2 and S1 --> S(n) transitions were found to be similarly dependent on solvent environment. The dynamics of the excited-state decay processes were analyzed with both single wavelength and global fitting procedures. In solution, the S1 lifetime of astaxanthin was found to be approximately 5 ps and independent of solvent. In alpha-crustacyanin, the lifetime was noticeably shorter at approximately 1.8 ps. Both fitting procedures led to the conclusion that the lifetime of the S2 state was either comparable to or shorter than the instrument response time. The data support the idea that dimerization of astaxanthin in alpha-crustacyanin is the primary molecular basis for the bathochromic shift of the S0 --> S2 and S1 --> S(n) transitions. Planarization of the astaxanthin molecule, which leads to a longer effective pi-electron conjugated chain and a lower S1 energy, accounts for the shorter tau1 in the protein.

Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Publishing Authors By Initials

RP Ilagan,RL Christensen,TW Chapp,GN Gibson,T Pascher,T ,HA Frank,

For similar organic chemicals: hydrocarbons: hydrocarbons, acyclic: alkenes: polyenes: carotenoids: xanthophylls research abstracts see: organic chemicals: hydrocarbons: hydrocarbons, acyclic: alkenes: polyenes: carotenoids: xanthophylls research

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Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: The journal of physical chemistry. A

VOLUME: 109

Page Numbers: 3120-7

Journal Abbreviation:

ISSN: 1089-5639

DAY: 14

MONTH: Apr

YEAR: 2005

Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9890903

Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Keywords Mesh Terms:

KEYWORDS: Xanthophylls

MESH TERMS: chemistry

Chemical & Substance for Abstract: Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin. Information

Substance Name: astaxanthine

Registry Number: 472-61-7

Grant and Affiliation Information for Femtosecond time-resolved absorption spectroscopy of astaxanthin in solution and in alpha-crustacyanin.

AFFILIATION: Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, USA.

Country: United States

AGENCY: United States NIGMS

GRANT: GM-30353

ACRONYM: GM

MEDLINETA: J Phys Chem A

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