Fraction collector control device and preparative liquid chromatograph

A fraction collector control device for controlling operation of a fraction collector,

• the fraction collector being a device for fractionating and collecting components separated in an analysis column of a liquid chromatograph based on a signal obtained by a detector of the liquid chromatograph,
• the fraction collector control device comprising:
• a peak designation part configured to display a chromatogram based on analysis data of a liquid chromatograph acquired in advance as a chromatogram for setting, and to require a user to select two or more peaks in the chromatogram for setting;
• a parameter extraction part configured to extract, as a parameter, a signal level and/or a slope at a start point and an end point of each peak designated by the user;
• a threshold candidate generation part configured to generate, based on the parameter extracted by the parameter extraction part, at least one threshold candidate usable as a common threshold for detecting start points of all of peaks designated by the user and for detecting end points of all of the peaks designated by the user;
• and
• a control part configured to control the fraction collector and to detect all peaks by using single threshold determined as the common threshold based on the threshold candidate generated by the threshold candidate generation part so that components of the peaks are fractionated and collected, wherein
• the threshold candidate generation part is configured to generate simulation parameters based on the parameter extracted by the parameter extraction part, to execute simulation of peak detection in the chromatogram for setting using the simulation parameters, and to set, as the threshold candidate, only simulation parameters used in simulation in which number of detected peaks is equal to number of the peaks designated by the user.