[Study on binding kinetics profiles of tea polyphenols-α-glucosidase interaction]

The combination index(CI) method was used to evaluate the combination inhibition mechanism of epicatechin gallate(ECG) and other tea polyphenols [epigallocatechin gallate(EGCG) and gallocatechin gallate(GCG)] on α-glucosidase. Herein, using ECG as research object, the surface plasmon resonance(SPR) analysis were employed to study the binding affinities and kinetic parameters of three tea polyphenols components on α-glucosidase, respectively. The concentration-time curve mathematical model of the drug in the unstirred water layer(the adjacent region of α-glucosidase) established previously by our group was used to evaluate the concentration-time curves of the tea polyphenols in the α-glucosidase vicinity. The prediction model of drug-α-glucosidase binding kinetics established by our group was used to evaluate the dynamic process of drug-α-glucosidase binding kinetics of different oral administration processes of ECG. Using acarbose as a reference, the accuracy of the model prediction was judged based on the difference between the prediction results and the actual clinical performance. Using the mathematical model of drug-α-glucosidase interaction, the drug-α-glucosidase binding kinetic characteristic curves of ECG in different administration processes were obtained, which indirectly proved that the synergistic effect of multi-component combination of traditional Chinese medicine and the clinical characteristics of repeat administration were scientific and reasonable.