BIOLOGICAL ACTIVITIES OF THAI HERBAL FORMULAS
(Sigma-Aldrich, USA) was added as a negadve conkol' DPPH iui"a-, nyato*yl. and superotde*-radical-scavenging activities were calculated by u-sing the follolt'ing equation'
Scavcnging activitv r') -
(A
--
B)
' too
where A is optical der$ity ut
'ttu "o"t'ul
solution ancl B is
optical density of the test solution'