Development and Validation of an HPLC Method for Simultaneous Assay of MCI and MI in Shampoos Containing Plant Extracts

Table 6

Results of robustness.

Variation	Specific condition	MI		MCI
		RSD (%) for peak area	RSD (%) for content in shampoo	RSD (%) for peak area	RSD (%) for content in shampoo
Flow rate (mL/min)	0.9	0.4	0.4	0.4	0.3
	1.0 (normal)	0.6	0.4	0.4	0.4
	1.1	0.6	0.5	0.6	0.3
Percentage of methanol in mobile phase (%)	29	0.8	0.6	0.4	0.6
	30 (normal)	0.6	0.5	0.4	0.3
	31	0.5	0.4	0.5	0.3