What is needle wash and seal wash in hplc?

In HPLC (High-Performance Liquid Chromatography), needle wash and seal wash refer to specific cleaning protocols for the injection system. The needle wash typically involves rinsing the sample needle with a solvent to prevent cross-contamination between samples, ensuring accuracy and reproducibility. Seal wash, on the other hand, involves cleaning the area around the injection port seal to maintain proper sealing and prevent sample leakage or contamination. Both processes are essential for maintaining the integrity of the analysis and prolonging the lifespan of the equipment.