An Investigation of Optimum NLC-Sunscreen Formulation Using Taguchi Analysis

Table 5

Zeta-potentials for various samples at different storage times.

	ζ (mV) (day 1)	ζ (mV) (day 30)		ζ (mV) (day 60)
		5°C	25°C	5°C	25°C
SU1	−28.4±0.987	−29.3±1.03	−35.2±0.99	−35.7±2.00	−36.8±1.65
SU2	−27.5±1.160	−45.9±0.69	−35.8±0.38	−40.4±1.60	−37.0±1.45
SU3	−33.5±0.240	−39.5±0.50	−46.6±0.46	−42.5±0.55	−45.8±0.61
SU4	−28.0±1.41	−38.1±0.99	−45.5±0.9	−38.9±1.45	−37.4±1.75
SU5	−32.0±2.76	−39.0±2.70	−46.6±0.45	−34.4±0.97	−44.1±0.49
SU6	−31.5±0.70	−40.4±1.31	−42.6±1.65	−38.1±1.28	−40.2±1.06
SU7	−32.5±2.65	−49.2±0.61	−50.6±1.37	−42.1±1.63	−40.5±2.07
SU8	−18.1±1.03	−56.8±0.30	−58.6±1.03	−44.9±0.96	−45.1±2.45
SU9	−15.1±1.84	−54.4±1.31	−52.9±1.12	−38.8±1.25	−36.6±1.25