Patent ID: 7862724

Claim:
A preparative liquid chromatograph system having a liquid chromatograph including a column for separating a component from a separation sample and a detector for detecting the component contained in an eluate coming from the separation column, a plurality of trap columns for trapping the component contained in the eluate, and a channel selector for switching a channel so that the eluate is selectively supplied to one of the trap columns, comprising: a) a chromatogram creator for creating a chromatogram during a chromatographic analysis of the sample, based on a detection signal produced by the detector; b) a peak area calculator for performing a real-time calculation of an area value of a peak of an objective component appearing on the chromatogram, the calculation starting from a point in time where the channel is switched by the controller to be mentioned below; and c) a controller for controlling the channel selector so that a destination of the eluate coming from the column is changed from one trap column to another every time the area value calculated by the peak area calculator reaches a predetermined value.