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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

jurnal ilmiah farmasi

ISOLATION AND IDENTIFICATION OF FLAVONOIDS FROM WATER FRACTION OF SECANG WOOD (CAESALPINIA SAPPAN. L) WITH THIN LAYER CHROMATOGRAPHY AND UV-VIS SPECTROPHOTOMETRY METHODS