Page 213 - Illustrated Pocket Dictionary of Chromatography

218 ZIRCONIA

the potential difference between fixed charges on the capillary wall.
This difference affects the electroosmotic mobility and drives the
separation.
zirconia A packing material that has a basic repeating structure
of ZnO 2 units. Zirconia is extremely stable to a wide range of pH.
It is typically modified through the cross-linking of surface-adsorbed
polymers containing reacting terminal groups. These groups then
act as grafting sites for bonded phase groups (e.g., octadecyl).

zwitterion Formed from an ampholyte when the proton on the
acid moiety is transferred to the base, resulting in a molecule that
bears positive and negative separated charges. Therefore the zwitte-
rionic form of glycine is:

H
O
H 3 N C

H O

Zwitterion