Table 1.

Selection and evaluation of excipient.

Species of excipient	Sedimentation volume
PVP (0.5%)	0.67
Xanthan gum (0.5%)	0.91
HPMC (0.5%)	0.8
HPMC (0.25%) + PVP (0.25%)	0.75
Xanthan gum (0.25%) + PVP (0.25%)	0.88
HPMC (0.25%) + xanthan gum (0.25%)	0.93