The N + implantation-induced influence upon the surface charges of tyrosine and adenosine molecule crystals was studied with the method of capillary electrophoresis. The swimming directions of the implanted molecule crystals were found to be related to dose of the implanted ions. Irradiated by 30keV N + with a dose of 15×10 19 /m 2

the tyrosine or adenosine crystals had three swimming models: to cathode

to anode

and motionless. This means that the charge exchange effect between N + and the target molecules exists and the transferred charge amount has been estimated.