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Table 4 Parameters for CP release at pH 7.4

From: Intestine-Specific, Oral Delivery of Captopril/Montmorillonite: Formulation and Release Kinetics

pH 7.4 Zero order First order Higuchi Koresmeyer–Peppas
  R2 R2 R2 R2 n
Solution 0.962 0.980 0.987 0.985 0.466
Melt 0.984 0.982 0.975 0.948 0.551
Grind 0.939 0.939 0.911 0.859 0.321