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Table 2 Summary of different release characteristics depending on release exponent n of Korsmeyer-Peppas [37]

From: In vitro kinetic release study of ketoprofen enantiomers from alginate metal complexes

Release mechanism model

Geometry

Release exponent (n)

Fickian diffusion

Planar (thin films)

Cylinders

Spheres

0.50

0.45

0.43

Anomalous transport

Planar (thin films)

Cylinders

Spheres

0.50 < n < 1.0

0.45 < n < 0.89

0.43 < n < 0.85

Case I transport

Planar (thin films)

Cylinders

Spheres

1.0

0.89

0.85

Super Case II transport Planar

Planar (thin films)

Cylinders

Spheres

n < 1.0

n < 0.89

n < 0.85