– 4 (dislike – most prefer) using the interview
questionnaires. Base lotion with the best
preference was chosen for further experiment.
Separate bases were incorporated by the
Tamarind seed coat extract (EtOAc fraction) at the
concentrations of its IC50, two and three folds of
IC50 (0.0017%, 0.0034% and 0.0051% w/w,
respectively). Physical stability test was performed
as previously described. For chemical stability,
each formula (0.3 g) was dissolved in absolute
EtOH (5 ml) and centrifuged at 3,500 ppm for 5
min under room temperature and the
supernatants were collected10) for the total
phenolics content determination.