Phytochemical and Antioxidant Studies on a Rare Rheum cordatum Losinsk. Species from Kazakhstan

Figure 2

Variability of rutoside (a), aloe-emodin (b), and epicatechin (ECA) (c) contents depending on the harvesting season and the solvent used (the codes applied: 1: ethanol; 2: 50% ethanol; 3: DCM; 4: H₂O; 5: CHCl₃; R: Rheum; SU: summer—the root collected at the end of May; SP: spring—the root collected at the beginning of April; AU: autumn—the root collected in October; 18 and 17: 2018 and 2017, respectively).

(a)

(b)

(c)