Figure 1. Excitation/emission spectra of 100 mM L-phenylalanine measured every 3 days during a 15-day incubation period.

Excitation/emission spectra without incubation (A), with 3 day (B), 6 day (C), 9 day (D), 12 day (E) and 15 day (F) incubation. The examined spectra region contains a second order diffraction artefact of Phe (marked in the no incubation spectra). Five nm excitation and emission slits were used.