Table 3.

Time (min) necessary to release 10, 50, and 90% of the loaded drug.

	CAl 600	CAl 400	CAlCh 600	CAlCh 400
HCl
t10%	24	12	31	85
t50%	—	—	—	—
t90%	—	—	—	—
pH 6.8
t10%	16	19	10	30
t50%	130	110	261	310
t90%	290	220	>8 h	>8 h
pH 7.4
t10%	16	25	28	35
t50%	229	187	423	>8 h
t90%	>8 h	444	>8 h	>8 h