A shampoo is considered of good quality if it decreases the surface tension of pure water from 72.28 dyn/cm to about 40 dyn/cm (Ilton et al., 2007).
All the tested shampoo showed similar reduction in surface tension ranging from 31.68 to 38.72 dyn/cm.
The reduction in surface tension is an indication of their good detergent action.
The formulated shampoo reduced the surface tension to 38.72 dyn/cm which is comparable to Herbal Essences® (38.36 dyn/cm). However, among all the shampoo, Dove®(31.68dyn/cm)has the lowest surface tension indicating that it has the strongest cleaning ability.
The commercial synthetic or semi-herbal shampoos may contain excessive detergents, which can strip the hair of up to 80% of the oil and thus damage the hair.
Using amild detergent in our shampoo, we have ensured that this does not happen.