Sampling time (h) 0 0.5 1 2 4 8
Levels of radioactivity + + +++ ++++
(+): A radioactive substance (14C-labeled GlcNs) was detected in the reception-tank sample. The number of “+” symbols is proportional to the amount of radioactivity detected.
(–): A radioactive substance was not detected in the reception tank sample.
Table 1: The amount of radiolabeled GlcNs that penetrated rat skin.