Antinociceptive Activity of Petroleum Ether Fraction of Clinacanthus nutans Leaves Methanolic Extract: Roles of Nonopioid Pain Modulatory Systems and Potassium Channels

Figure 7

The UV spectra analysis of PECN. The UV spectra demonstrated the presence of 3 major peaks labelled as P1 (RT=18.434 min), P2 (RT=18.659 min), and P3 (RT=20.148 min), which were observed at their respective at the region of 222.5–332.6, 192.0–336.2, and 216.6–335.0 nm, respectively, suggesting, in part, the presence of phenylchroman (C₆–C₃–C₆) skeletal structures.