Fig. 4. The reaction rate of propofol on ABTS·+scavenging ability. After being dissolved in methanol, the propofol was added to a standard ABTS·+solution to prepare a final concentration of 4 μM. The reaction rate was measured at the first 5, 10, 30, 60, and 120 s, respectively. n = 6 in each group. Data were shown as means ± SD. Significant difference between-group was analyzed by independent Students t test based on adjusting the P value using a Bonferroni correction. ABTS·+= 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) radical; ABTS = 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid).