Figure 3.

(a) Trolox-equivalent content in R. rosea extracts after in vitro treatment by the simulated gastric and intestinal media. * p < 0.05 vs. intestinal phase group; ** p < 0.001 vs. intestinal phase group. Groups: 1—initial group; 2—group after gastric phase; 3—group after intestinal phase. (b) Radical scavenging activity of selected compounds (as IC₅₀, μM). 1—1,6-di-O-galloyl glucose; 2—1,2,3,4,6-penta-O-galloyl glucose; 3—procyanidin B1 (as an example of procyanidin dimer); 4—procyanidin C1 (as an example of procyanidin trimer); 5—epicatechin; 6—epigallocatechin gallate; 7—gallocatechin gallate; 8—arbutin; 9—salidroside; 10—rosarin; 11—rosavin; 12—rosin; 13—rhodiolgidin; 14—rhodionidin; 15—herbacetin-3-O-glucoside-8-O-glucuronide; 16—trolox.