Lysenko E P, Potapenko A Ia, Sukhorukov V L
Biofizika. 1988 Sep-Oct;33(5):747-50.
The shape of absorption spectra is changed and their maxima are red shifted with an increase of furocoumarin (psoralen, 8-methoxypsoralen and angelicin) concentration. Fluorescence excitation spectra of psoralen, 7-methoxycoumarin and 7-hydroxy-4-methylocumarin do not depend on the concentration in solutions. They are similar or coincident with absorption spectra of the most concentrated solutions. One may conclude the existence of different forms of furocoumarin and coumarin aggregates in solution. From the coincidence or similarity of fluorescence excitation spectra and absorption spectra in the most concentrated solutions it may be proposed that only the aggregated forms of psoralens and coumarins (the dimers or associates of higher order) are able to emit fluorescence.
随着呋喃香豆素（补骨脂素、8-甲氧基补骨脂素和白芷素）浓度的增加，吸收光谱的形状发生变化，其最大值发生红移。补骨脂素、7-甲氧基香豆素和7-羟基-4-甲基香豆素的荧光激发光谱不依赖于溶液中的浓度。它们与最浓溶液的吸收光谱相似或重合。可以得出结论，溶液中存在不同形式的呋喃香豆素和香豆素聚集体。从最浓溶液中荧光激发光谱和吸收光谱的重合或相似性可以推测，只有补骨脂素和香豆素的聚集形式（二聚体或更高阶的缔合体）能够发出荧光。
