The semi-preparation high-performance liquid chromatography (HPLC) system is a critical device for the separation and purification of target compounds from mixtures, widely applied in drug development, natural product extraction, and chemical synthesis product purification. With a broad flow range and high automation, it can meet the large-scale requirements ranging from trace analysis to gram-scale preparation.
Applications
Drug research and development: separation of active ingredients, preparation of impurities, purification of reference standards;
Natural product extraction: separation of traditional Chinese medicine, plant, and microbial metabolites;
Chemical synthesis and purification: purification of intermediates and final products, chiral resolution;
Biologics preparation: purification of peptides, proteins, and nucleic acids;
Laboratory preparation: preparation of standards, sample pretreatment, and small-scale production.
A typical semi-preparative liquid chromatography system consists of:
Flow delivery system: high-pressure constant-flow pumps (e.g., tandem dual pumps) ensure stable flow rates.
Sample introduction system: automated samplers or manual injection valves;
Chromatographic column: semi-preparative columns (typically 10-30mm inner diameter), with optional dynamic axial compression columns;
Detection system: UV detectors or full-spectrum scanning detectors;
Fraction collection system: intelligent fraction collectors compatible with test tubes, microplates, and other containers;
Control system and software: integrated operation platform for method design, runtime monitoring, and data management.
System Maintenance
The pump system: replace seals periodically, use purified mobile phase, and prevent salt precipitation or bubble formation;
Chromatographic column: employ protective columns, perform proper balancing and cleaning, and store with appropriate solvent;
Detector: keep the flow cell clean, avoid direct sunlight, and calibrate regularly;
Flow path system: perform periodic flushing to prevent clogging or contamination, and inspect connector seals; Comprehensive maintenance: maintain usage logs, and conduct regular system performance testing and validation.
What characteristics should a user-friendly semi-prepared liquid chromatography system possess?
Wide flow rate range: Supports 0.01~ 40 mL/min, enabling smooth transition between analytical and preparative modes;
High automation integration: features automatic sample injection, gradient elution, fraction collection, and online detection;
Low-pulsation delivery: serial constant-flow pump technology ensures stable flow rate and improved separation reproducibility;
Intelligent fraction collection: supports multiple triggering modes including time, signal threshold, and peak shape, ensuring precise and flexible positioning;
Scalability: modular design allows optional selection of detectors, collectors, and column systems;
Safety and stability: equipped with leak alarm, pressure protection, and self-diagnostic functions to ensure long-term stable operation.
