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The raw material of tocopherol was tested for the preparation of "Tocopherol Reference Standard (Control 991)". Analytical data obtained were: IR spectrum, same as the Tocopherol Reference Standard (Control 941); specific absorbance, E/cm% (292 nm) = 72.9; thin-layer chromatography, no impurities were detected until 50.0 micrograms; high-performance liquid chromatography (HPLC), trace amounts of five impurities were detected and the total amount was estimated to be less than 1.4%; assay by HPLC, 99.9%. Based on the above results, the raw material was authorized as the Japanese Pharmacopoeia Standard (Control 991).
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