Capillary zone electrophoresis (CZE) is used to determine allantoin in
after shave lotions, pain-relieving gel and plaque-removing mouth rin
ses. At a pH > 9, allantoin is anionic and can be resolved from other
components, eluting in < 6 minutes. Detection is at 230 nm. This metho
d should be applicable to the determination of allantoin in the wide v
ariety of products in which it is a component.