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- W2022762243 abstract "Abstract In this paper, high‐speed counter‐current chromatography (HSCCC), assisted with ESI‐MS, was first successfully applied to the preparative separation of three macrolide antibiotics, brefeldin A (12.6 mg, 99.0%), 7′‐ O ‐formylbrefeldin A (6.5 mg, 95.0%) and 7′‐ O ‐acetylbrefeldin A (5.0 mg, 92.3%) from the crude extract of the microbe Penicillium SHZK‐15. Considering the chemical nature and partition coefficient ( K ) values of the three target compounds, a two‐step HSCCC isolation protocol was developed in order to obtain products with high purity. In the two‐step method, the crude ethyl acetate extract was first fractionated and resulted in two peak fractions by HSCCC using solvent system n ‐hexane/ethyl acetate/methanol/water (HEMWat) (3:7:5:5 v/v/v/v), then purified using solvent systems HEMWat (3:5:3:5 v/v/v/v) and HEMWat (7:3:5:5 v/v/v/v) for each fraction. The purities and structures of the isolated compounds were determined by HPLC, X‐ray crystallography, ESI‐MS and NMR. The results demonstrated that HSCCC is a fast and efficient technique for systematic isolation of bioactive compounds from the microbes." @default.
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- W2022762243 date "2010-02-01" @default.
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- W2022762243 title "Isolation and purification of macrocyclic components from Penicillium fermentation broth by high-speed counter-current chromatography" @default.
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- W2022762243 doi "https://doi.org/10.1002/jssc.200900630" @default.
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