Table 3. Thermodynamic parameters of the interaction between BSA and emodin, HEI1, HEI2, and HEI3.

Variable	ΔH	ΔG	ΔS
Emodin	−22.17	−22.47	1.01
HEI1	−18.16	−31.45	44.60
HEI2	−204.79	−41.56	−547.74
HEI3	−10.5	−38.56	94.17

BSA, bovine serum albumin; HEI1, 2-iodioemodin; HEI2, 2,4-diiodoemodin; HEI3, 2,4,5-triiodoemodin.