Table 8.

Evaluation of surface tension (mean dynes/cm ± SD, n = 3) for the tested shampoo brands.

	Time for sample	Pantene	Sunsilk	Herbal essences	Ultra Doux	Syoss	L'Oreal Elvive
At 25 °C	At zero time	34.7 ± 2.6	32.2 0.7	32.5 ± 2.3	33.1 ± 2.4	32.5 ± 1.9	34.1 ± 2.8
	After four weeks	32.2 ± 3.3	32.3 ± 1.1	31.9 ± 3.2	32.9 ± 3.4	32.1 ± 3.6	34.2 ± 3.5
	After eight weeks	31.3 ± 4.3	32.1 ± 1.2	32.7 ± 3.4	33.1 3.3	32.6 ± 3.4	33.9 ± 4.2
At 4 °C	At zero time	34.7 ± 2.5	32.2 ± 0.7	32.5 ± 2.3	33.1 ± 2.4	32.5 ± 1.9	34.1 ± 2.8
	After four weeks	35.2 ± 2.0	31.0 ± 1.1	31.9 ± 2.3	32.9 ± 3.1	32.4 ± 4.1	33.9 ± 4.5
	After eight weeks	30.1 ± 3.0	30.2 ± 2.2	32.7 ± 4.1	32.9 ± 3.0	32.7 ± 4.2	34.1 ± 4.2
At 45 °C and 75% humidity	At zero time	34.7 ± 2.6	32.2 ± 0.7	32.5 ± 2.3	33.1 ± 2.4	32.5 ± 1.9	34.1 ± 2.8
	After four weeks	28.7 ± 2.1	28.4 ± 0.3	29.1 ± 0.5	29.3 ± 0.9	30.2 ± 0.2	31.8 ± 0.2
	After eight weeks	27.2 ± 2.2	29.3 ± 1.1	29.1 ± 0.5	29.3 ± 0.9	30.2 ± 0.2	31.8 ± 0.2