Fig. 3
From: Kinetics of DPPH• scavenging by bacterioruberin from Haloferax alexandrinus GUSF-1 (KF796625)
a Visible absorption spectrum of 13 µM bacterioruberin in methanol, 0.2 mM methanolic DPPH• and (i–iv) bacterioruberin-DPPH· interaction; b 0.2 mM DPPH• remains steady at 517 nm in the absence of bacterioruberin (filled triangle) and 0.2 mM DPPH• in the presence of 13 µM of bacterioruberin at 517 nm (open triangle); c residual concentration of DPPH• (mM) monitored at A517 in the presence of bacterioruberin: residual DPPH• (filled triangle) and scavenged DPPH• (open triangle). Data are expressed as mean ± SD of three independent experiments