Fig. 5

Fluorescence emission spectra of curcumin: i fluorescence spectra of both curcumin (A) and Ccm-FΔF at two different points, (B) at 1 day and (C) after 90 days, in aqueous solution of methanol (1:1, v/v) at an excitation wavelength of 425 nm. ii Amount of curumin present in Ccm-FΔF nano-formulations during the incubation period. Curcumin content was determined at three different time points (1, 14 and 90 days). It was observed that the curcumin concentration inside the nanotubes remained almost constant even after 90 days of storage depicting the stability of the drug inside the nanotubes