Figure 1: Time-dependent stability of Curcumin-derivative (Curc). Curc (A) or native curcumin (B) were dissolved in acetone (6 mg/mL) and the fluorescence spectra were recorded at different times (0, ⋅ − ⋅, 60, −−, 120, ---, 180 min, − −) at 25°C, with λex of 340 nm or 420 nm for Curc or curcumin, respectively.