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Some system factors like poor packing, distribution system and viscous heat dissipation may result in the core of a solute concentration band goes faster, forming a parabolic concentration band and reducing column efficiency. Feed temperature control method, which is to appropriately control eluent at the column inlet at a temperature lower than the wall temperature, can modify the band shape and...
Three -acid type chiral stationary phases based on monochloro-substituted phenyl carbamates of -cyclodextrin have been synthesized. First, -cyclodextrin was reacted with 5-bromo-1-pentene in dry DMF at room temperature to give 6A-O-(4-pentenyl)--cyclodextrin. The remaining twenty hydroxyl groups of this derivatized -cyclodextrin were blocked by further reaction with 2-chlorophenyl isocyanate, 3-chlorophenyl...
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