ONLINE ELECTRODIALYSIS CAPILLARY ZONE ELECTROPHORESIS OF ADENOSINE-TRIPHOSPHATE AND INOSITOL PHOSPHATES

Electrodialysis (ED) has been coupled to capillary zone electrophoresi s (CZE) as an on-line sample pretreatment technique. Analytes are intr oduced into the fused-silica capillary through a membrane with a molec ular mass cut-off of 30 000. As reversed polarity is applied only smal l negatively charged ions are injected whereas positively charged and/ or large compounds are retained. ED takes only ca. 20 s and is compara ble with electrokinetic injection in several respects. ED-CZE has been applied to adenosine triphosphate in blood plasma and to inositol pho sphates in fermentation broth.