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Separation of lac dye components by high-speed counter-current chromatography. 1998
H Oka, and
Y Ito, and
S Yamada, and
T Kagami, and
J Hayakawa, and
K Harada, and
E Atsumi, and
M Suzuki, and
M Suzuki, and
H Odani, and
S Akahori, and
K Maeda, and
H Nakazawa, and
Y Ito
Aichi Prefectural Institute of Public Health, Nagoya, Japan.
High-speed counter-current chromatography has been successfully applied to the separation of the lac dye components. A 25-mg quantity of the sample was separated using a two-phase solvent system composed of tert.-butyl methyl ether-n-butanol-acetonitrile-water (2:2:1:5). The fractions were analyzed by high-performance liquid chromatography and electrospray tandem mass spectrometry. The separation yielded 2.6 mg of 97.2% pure laccaic acid C, 9.5 mg of 98.1% pure laccaic acid A, 3.6 mg of 98.2% pure laccaic acid B, and 0.5 mg of a 95.0% pure anthraquinonedicarboxylic acid with a molecular mass of 360.
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