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Aim of this research was to determine chemical structure of flavonoid from water fraction of
Sappan wood. The flavonoid was isolated by Soxhlet xtraction using methanol and infundation.
First, the detection of flavonoid was done using Thin Layer Chromatography (TLC) with statioram
phase silica gel GF 254 and mobile phase ethyl acetate : acetyc acid 15 % (9:1 v/v) smoked by
NH3, and detected under UV 366 nm, showed 5 spots with hRf 7, 50, 61, 68, and 80. Preparatif
TLC was done to water fraction, disolveed in methanol and detected with UV-Vis
spectrophotometry using diagnostic reagents NaOH, NaOAc, NaOAc+H3BO3, AlCl3, ACl3+HCl and
compared with references. In fraction 1, 2, and 5 showed isoflavon with 7-OH, substitution oxygen
in position six. In fraction 3 showed isoflavon with 7-OH, substitution oxygen in position six, 6,7
diOH in A ring, and o-diOH in 6,7 or 7,8. In fraction 4 showed isoflavon with 7-OH, substitution
oxygen in 6, o-diOH in 6,7 or 7,8 and 5-OH.
Key Words: Caesalpinia Sappan. L, Flavonoid, TLC, UV-Vis Spectrophotometry