Surfactant‑modifed carbon nano‑onion‑β‑cyclodextrin nanocomposite as an efcient sorbent in dispersive solid phase extraction of metoprolol and atenolol from plasma samples prior to HPLC–PDA analysis

Surfactant‑modifed carbon nano‑onion‑β‑cyclodextrin nanocomposite as an efcient sorbent in dispersive solid phase extraction of metoprolol and atenolol from plasma samples prior to HPLC–PDA analysis