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In this study we have applied UV/vis absorption spectroscopy, steady state fluorescence, Raman spectra to investigate the effects of tyrosine on the aggregates of lutein and β-carotene. Absorption spectra analysis revealed that hydroxyl and amino groups of tyrosine can affect the aggregate of lutein to a certain extent. In Raman spectra the effect of tyrosine on the length of conjugation was observed in the case of lutein molecule. In addition tyrosine also had a great effect on the excited electronic state of carotenoids, and internal energy transferring among aggregates.
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Lu et al. (2015) studied this question.
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