Automated parallel reactorWith its high-throughput and multi parameter parallel experimental capabilities, it has become a core tool for drug screening, catalyst optimization, and process development. However, residual cross contamination is the main risk in its long-term operation, especially when dealing with highly active compounds such as cell toxins and hormones, which may seriously affect the accuracy and reproducibility of subsequent experimental results. Therefore, establishing a scientific cleaning and pollution prevention system is crucial.
1、 Whole process cleaning strategy
Immediate flushing after experiment: After the reaction is complete, immediately perform an automatic flushing procedure on the reaction tube, feeding needle, and pipeline with an inert solvent (such as methanol, acetonitrile, or DMF) to prevent product solidification;
Multi level cleaning cycle: The high-end system supports multi-step cleaning of "solvent A → solvent B → ultrapure water → nitrogen blow drying" to ensure no organic/inorganic residues;
Ultrasonic assisted cleaning: For stubborn attachments, the reaction module can be moved to an ultrasonic cleaning tank for 10-15 minutes for treatment;
High temperature baking: Some models integrate a 60-120 ℃ drying function to completely remove moisture and volatile residues.
2、 Key points of anti cross contamination design
Disposable consumables application: using replaceable PTFE reaction lining, sealing gasket, and sampling needle to achieve "one pot, one change";
Independent flow path isolation: Each reaction site is equipped with dedicated feeding and exhaust channels to avoid cross-talk caused by shared pipelines;
Negative pressure exhaust system: Activate local negative pressure during lid opening or sampling to prevent aerosol diffusion;
Material compatibility: The contact surface is made of 316L stainless steel or high-purity PTFE, which is corrosion-resistant and not easy to adsorb molecules.
3、 Verification and Compliance Management
According to ICH Q2 (R2) and GMP requirements, regular cleaning validation should be performed:
Use HPLC or TOC to detect residual peaks in the solvent after cleaning;
Set acceptance criteria (such as residual ≤ 0.1% or 10 ppm);
Establish a cleaning log to record solvent type, frequency, operator, and verification results.
Through the three in one solution of "hardware isolation+program cleaning+verification closed-loop", the risk of cross contamination can be reduced to a lower level, ensuring the reliability and compliance of high-throughput experimental data.