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Fast and accurate separation of the paclitaxel from yew extracum by a pseudo simulated moving bed with solvent gradient.
Journal of Chromatography. A 2018 August 25
A pseudo simulated moving bed (SMB) with solvent gradient was used to trap and separate paclitaxel from yew extracum. This SMB process consisted of three steps: feeding, purification and recovery. In comparison with methanol/water as an eluent, acetonitrile/water could give a better separation but had a poor dissolubility of the yew extracum, and therefore methanol/water was used in the feeding followed by acetonitrile/water in the purification. In the first two steps, water was deliberately added into zone III to modulate the eluotropic strength of the liquid entering zone III, so as to make paclitaxel separation from impurities be more efficient. Once most of impurities discarded, the columns were in turn eluted to recover the trapped paclitaxel of 98% yield with a purity of 78% from the yew extracum containing 1.5% paclitaxel. Afterward, an additional operation of crystallization improved the purity further to 97.8% with the yield of 95%.
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