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- W2049096554 abstract "Enantioselectivity of chiral selectors is often relatively low in chiral HPLC. For difficult chiral separations, often only partial resolution is obtained rather quickly by column and mobile phase screening, and, by trial-and-error, additional method optimization is required to achieve complete resolution. This paper describes the development of a novel column-switching technique called simulated moving columns (SMC) to quickly achieve complete chiral resolution on columns with limited enantioselectivity. The simulated moving columns (SMC) technique uses two (2) or three (3) short chiral HPLC columns connected in series, and forces the unresolved enantiomers to recycle exclusively through the columns until sufficient resolution is attained. In effect, SMC helps to achieve chiral resolution by virtually multiplying the column length, thus enhancing separation efficiency and resolution, without increasing backpressure. Comparison of the standard non-SMC approach with SMC, and selected applications of chiral separations of pharmaceutical drug molecules are presented. Through measurement and calculation, evaluation of off-column band broadening resulting from a two-column SMC system is provided. The results clearly indicate that SMC eliminates the significant band broadening that is inevitable in the closed-loop recycling techniques currently used in preparative chromatography. Furthermore, SMC is not only useful to enhance resolution for analytical and preparative chiral separation, but also has great potential to enhance recovery and purity for difficult chiral preparative chromatography." @default.
- W2049096554 created "2016-06-24" @default.
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- W2049096554 date "2004-03-01" @default.
- W2049096554 modified "2023-09-23" @default.
- W2049096554 title "Simulated moving columns technique for chiral liquid chromatography" @default.
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- W2049096554 doi "https://doi.org/10.1016/j.chroma.2003.11.109" @default.
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