Table 2

Parameters	Dual wavelength method		Q-analysis method		MCR method		EXRSM method		Reported HPLC **
Parameters	ALP	BENZ	ALP	BENZ	ALP	BENZ	ALP	BENZ	ALP	BENZ
Alloben^® tablets^a (B.N.100251)	100.85± 1.131	98.02± 0.973	99.06± 1.275	99.67± 1.305	99.33± 1.190	98.47± 1.475	101.04± 1.261	98.72± 1.012	97.47± 1.250	97.70± 0.924
Standard addition^b	99.45± 1.050	99.97± 1.286	98.05± 1.283	99.27± 1.137	98.53± 1.366	99.83± 0.927	99.11± 1.015	99.39± 0.795	98.36± 0.847	98.43± 1.281
F-test ^c	1.072(4.387)	1.846(4.875)	1.553(4.235)	1.795(4.228)	1.824(4.357)	1.254(4.208)	1.054(4.148)	2.234(4.526)
Student’s t-test ^c	0.593 (2.160)	0.735(2.252)	0.813(2.228)	0.487(2.200)	1.147(2.146)	0.955(2.261)	1.342(2.323)	0.953(2.252)

^a Average of six determinations.
^b Average of 3 determinations.
^c The values in the parenthesis are the corresponding theoretical values at р= 0.05.
**Reported RP-HPLC method using phosphate buffer PH: 4.0-acetonitrile-methanol (50:30:20v/v/v) as a mobile phase with UV detection at 250nm

Table 2: Determination of the studied drugs in the pharmaceutical preparations by the proposed methods and statistical comparison with reported HPLC method.