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《Acta Optica Sinica》 2006-01
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Flurorescene Spectra of Lycopene in Different Solvents

Dai Songhui~1 Li Ping~1 Yang Xiaozhan~1 Wu Dacheng~2 Li Ruixia~2Yang Jianhui~1 Xiao Haibo~11 Institution of Atomic and Molecular Physics,Sichuan University,Chengdu 6100652 Textile College,Sichuan University,Chengdu 610065  
The flurorescecne spectra of lycopene in different solvents including hexane,ethyl acetate,terrahydrofuran,chloroform,acetone,benzene and of lycopene-terrahydrofuran solution with different concentrations are measured by a fluorescence spectrophotometer.It is found that the wavelength of fluorescence spectra maximum(λ_(max)) change along with the variation of the polarity of solvent.The transition energies(E_T) of lycopene calculated in different solvents are(220.5 kJ/mol,) 218.2 kJ/mol,215.6 kJ/mol,215.2 kJ/mol,(214.9 kJ/mol,) 211.5 kJ/mol.When the concentration of lycopene-terrahydrofuran solution is lower than 50 μg/ml,the intensity of fluorescence increases with the increase of solution concentration,when the concentration is higher than 50 μg/ml,the intensity of fluorescence decreases with the increase of the concentration,which is caused by the interaction between molecules in the excited state and the ground state.Three weak peaks appear in the fluorescence spectra of solutions when the concentration of which is lower than(80 μg/ml.) The corresponding transition energies can be calculated as below: E~((1))_T=278.2 kJ/mol、E~((2))_T=260.2 kJ/mol and E~((3))_T=239.3 kJ/mol.
【Fund】: 高等学校博士点专项科研基金(2001060024)资助课题
【CateGory Index】: O657.3
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