  Quantum non-local charges are central to the quantum integrability of a
sigma-model. In this paper we study the quantum consistency and UV finiteness
of non-local charges of string theory in AdS(5)xS(5). We use the pure spinor
formalism. We develop the near-flat space expansion of the transfer matrix and
calculate the one-loop divergences. We find that the logarithmic divergences
cancel at the level of one loop. This gives strong support to the quantum
integrability of the full string theory. We develop a calculational setup for
the renormalization group analysis of Wilson line type of operators on the
string worldsheet.
