Table 2 Drug release, capsule disintegration, unfolding (pH 1.2) and Young’s modulus tests results.

From: Development of Gabapentin Expandable Gastroretentive Controlled Drug Delivery System

Formula

Cumulative drug release % (6 hours)

Capsule disintegration time (minutes)

Unfolding test

Young’s modulus (N/mm2)

F.A

81.8

2.1

Fail

0.0117

F.B

73.1

2.5

Fail

0.0079

F.C

49.8

3.6

N/A*a

N/A*a

F.D

60.0

2.4

N/A*a

N/A*a

F.E

91.2

3

Pass*b

0.0142

F.F

78.2

3.4

Pass

0.0067

F.G

77.5

2.8

Pass

Fail*c

F.H

84.9

3.7

Fail

0.0174

F.I

78.7

3.6

Fail

0.0086

F.J

89.5

4

Pass

0.0258

F.K

79.4

2.7

Fail

0.0115

F.L

82.8

3.6

N/A*a

N/A*a

F.M

91.3

2.4

Pass

0.0133

F.N

72.0

3.8

N/A*a

N/A*a

F.O

81.4

3.4

N/A*a

N/A*a

F.P

94.5

3

Fail

0.0164

F.Q

100

3.7

Pass

0.0258

F.R

94.6

2.8

N/A*a

N/A*a

F.S

98.6

2

N/A*a

N/A*a

  1. *aTest is not applicable due to low layer elasticity, *bA layer passes the unfolding test if it unfolds within 15 minutes of being in contact with the release test medium, *cFailing in Young’s modulus test when the layer is cut upon stress.