Table 2. Stern–Volmer Constants (KSV) for Complexes of Tetrandrine and Its Derivatives Studied Herein with DNA-1, DNA-2, and DNA-3a.
| compound | DNA-1 | DNA-2 | DNA-3 |
|---|---|---|---|
| tetrandrine | 7.34 × 103 | b | b |
| BNaphT | 1.69 × 104 | 1.45 × 104 | 6.76 × 103 |
| BAqT | 1.33 × 105 | 5.17 × 104 | 1.53 × 104 |
| BPyrT | 4.84 × 104 | 1.34 × 104 | 8.26 × 103 |
| BInT | 2.72 × 104 | 2.32 × 104 | 1.08 × 104 |
DNA-1, 5′-GTA AGA TGA TTC-3′ and 5′-GAA TCA TCT TAC-3′; DNA-2, 5′-poly(A)18-3′ and 5′-poly(T)18-3′; DNA-3, 5′-poly(G)18-3′ and 5′-poly(C)18-3′. Complexes were formed in phosphate buffer with 10% DMSO (v/v), pH = 7.2, 0.01 M NaCl, at 25 °C.
Not determined.