[Estrone Reference Standard (Control 021) of National Institute of Health Sciences].

The raw material of estrone acetate was examined for the preparation of the "Estrone Reference Standard (Control 021)", The analytical data obtained were: UV spectrum, lambda max of 281 nm and specific absorbance in ethanol at 281 nm = 76.1; Melting point, 261.6 degrees C; IR spectrum, exhibited the specific absorptions at 3345, 2867, 1720, 1499 and 1055 cm-1; thin-layer chromatography, 2 impurities were detected at 100 and 200 micrograms; high-performance liquid chromatography, total amount of impurities estimated to be less than 0.3%. Based on the above results, the raw material was authorized as Estrone Reference Standard (Control 021) of the National Institute of Health Sciences.