Fig. 1. Chemical structures and absorbance spectra of the following compounds. The absorption peak at 340 nm and 415 nm of the compound ABTS were ABTS and ABTS·+, respectively. DMSO (—), Propofol (- · -), and ABTS (- ·· -). DMSO = dimethyl sulfoxide; ABTS = 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid); ABTS·+= 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) radical.