Shimadzu Scientific Instruments The new LCMS-prepSTAR Preparative LC/MS features real-time mass directed fraction collection in a fully automated system. The unit has been optimized to collect fast peaks and perform “heart cut” peak collection based on detected masses. Peaks can also be collected based on threshold, peak height or slope. The unit can deliver analytical to preparative flow rates from 0.1-150 ml/min from the same system. Valve switching from analytical to preparative and fraction collection is automatically controlled.