A FLOW-INJECTION MICRODIALYSIS SAMPLING CHEMILUMINESCENCE SYSTEM FOR IN-VIVO ONLINE MONITORING OF GLUCOSE IN INTRAVENOUS AND SUBCUTANEOUS TISSUE-FLUID MICRODIALYSATES

A novel now injection on-line microdialysis system for in vivo monitor ing of glucose in subcutaneous tissue fluid and blood is described, An implantable loop-type microdialysis probe was used for subcutaneous s ampling, and a flow-through microdialyzer was used for intravenous sam pling by pumping of the blood from the tested rabbit through the micro dialyzer located outside the living system at a now rate of 10 mu L/mi n. The perfusion rate of the dialysate was 20 mu L/min. The glucose in the dialysate was detected on-line with a now injection chemiluminesc ence system after passing through an immobilized glucose oxidase react or. The calibration of the detector system (including reader) and moni toring of baseline drifts were performed simultaneously to improve the reliability of the monitoring process. The dialysate sample volume wa s 20 mu L, and the sample throughput was 28 h(-1). The variation of gl ucose level in subcutaneous tissue fluid and blood of the rabbits was monitored after the administration of glucose or insulin to demonstrat e the favorable resolution and reliability of the system for in vivo o n-line monitoring.