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Du, Qizhen; Fang, Jie; Gao, Shijun; Zeng, Qiaoyun; Mo, Cehui
Separation and purification technology, 03/2008, Letnik: 59, Številka: 3Journal Article
The myrosinase cleavage of glucosinolates yields thioglycosidic compounds that show cancer chemoprevention. Glucosinolates occupied about 5% of the oil-pressed residue of rapeseeds. The present study describes the separation of 3-butenyl-glucosinolate ( G1) and 2-hydroxy-3-butenyl-glucosinolate ( G2) from the extract of the oil-pressed residue of rapeseeds by using slow rotary countercurrent chromatography (SRCCC) with a solvent system composed of n-butanol–acetonitrile–10% (NH 4) 2SO 4 water solution (1:0.5:2, v/v/v). The separation of 50 g crude extract by a SRCCC instrument equipped with a 22 L column yielded 0.91 g of 1 and 3.57 g of 2 in 37.5 h. The purity of the two compounds was more than 95%, determined by HPLC. The structures of compounds 1 and 2 were identified by ESI-MS, 1H NMR and 13C NMR.
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