Quantification of Rifaximin in Tablets by Spectrophotometric Method Ecofriendly in Ultraviolet Region

Table 5

Calculated values through the and -tests to variations of absorption spectrophotometric method in the ultraviolet region for determination of rifaximin in tablet.

Test	Wavelength (nm)		Wavelength (nm)		Source of purified water		Ethyl alcohol (%)		Ultrasound time (min)
	290	288	290	292	Lab A	Lab B	20	18	15	10
	1.0		1.11		1.48		9.81		10.36
	19.0		19.0		19.0		19.0		19.0
	0.47		0.75		0.24		2.08		5.41
	2.78		2.78		2.78		2.78		2.78