*2.5. Fluorescence Intensity Measurements of Aqueousphase*

PAA-F1 concentration in aqueous phase was monitored by fluorescence intensity measurements, carried with luminescence spectrometer Shimadzu RF-6000 (Shimadzu Corporation, Kyoto, Japan) operating with a xenon lamp as a light source. All spectral measurements were carried out in a quartz sample cell (path length = 1 cm) at 20 ± 1 ◦C in air-saturated solutions. The fluorescence intensity was measured at a wavelength of 462 nm (2 nm slid width).
