Objective: To prepare colon-targetting tablets of total alkaloids of Sophora alopecuroides and evaluate the effect of pectins of different degree of esterification (DE) on sophoridine release profiles in-vitro.

Method: Wet granulation technique was employed to prepare petin-based matrix tablets, then tablets were coated the optimal formulation with Kollicoat MAE 30 DP based on the optimal formulation and analysed their release.

Result: Coated formulation E could target total alkaloids of S. alopecuroides to colon and various DE of pectin exerted different effects on sophoridine release. The release of low DE pectin-based matrix tablets coating with Kollicoat MAE 30 DP approximatedly fitted zere-order eqution, which was erosion depended.

Conclusion: Low DE pectin-based matrix tablet coating with Kollicoat MAE 30 DP can deliver sophoridine to colon, hence improve the effectiveness of sophoridine.

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