Robotic liquid-handling stations (RLHSs) are the mainstay of high-throughput biomedical/forensic DNA sample processing facilities. These liquid-handling systems can be alternatively tooled with either disposable or fixed-tip pipetting heads. The use of disposable tips is often perceived as the best tip configuration to eliminate cross-contamination between biological samples processed on liquid-handling stations. However, this suppression can be effectively achieved on instruments equipped with fixed tips with optimally designed tip wash station (WS) configurations. Fixed-tip instruments offer many significant sample processing advantages with respect to precision, pipetting of liquids that may contain aggregates, and operational cost. This report discusses how cross-contamination suppression was achieved for the reliable processing of forensic casework samples on specially configured fixed-tip TECAN Genesis RSP/Freedom EVO RLHSs. A critical analysis of the major components involved in tip washing, as well as the specifications of a redesigned tip-washing routine that increases wash effectiveness and significantly reduces processing time and cost is also presented. © 2007, Society for Laboratory Automation and Screening. All rights reserved.
Frégeau, C. J., Yensen, C., Elliott, J., & Fourney, R. M. (2007). Optimized Configuration of Fixed-Tip Robotic Liquid-Handling Stations for the Elimination of Biological Sample Cross-Contamination. Journal of Laboratory Automation, 12(6), 339–354. https://doi.org/10.1016/j.jala.2007.08.001