MARERIALS AND METHODS:
Sample preparation
All of solvents used are reagent grade unless
otherwise stated. Those for cosmetic formu-lation
are cosmetic grade. Tamarind seed coat cultivated
in Chiang Rai was prepared by removing of the
edible part and heat under 140°C for 45 min5).
The seed coat was further ground into powder.
The powder (50 g.) was extracted by the modified
method from the literature5) by suspended the
powder in 70% EtOH (1,000 ml) followings
vigorous shaking for 30 min in separatory funnel
and filtered (× 3). The filtrates were combined and
concentrated in vacuo. The crude extract was
dissolved in 100 ml of 70% EtOH and partitioned
with CH2Cl2 (150 ml × 3). The organic layers were
combined and washed by saturated brine and
concentrated to afford CH2Cl2 fraction. The
aqueous part was further partitioned with EtOAc
(150 ml × 3) and worked up as usual to give
EtOAc fraction. The remaining aqueous layer was
concentrated by azeotropic distillation with MeOH
yielded Aq. fraction. Separately, the seed coat
powder (100 g) was macerated in n-hexane,
EtOAc and 95% EtOH, respectively, with shaking
at 150 rpm for 24 hr under ambient temperature.
The whole was individually filtered and
concentrated to obtain mac. n-hexane, mac.