Some literarture which may be of help with the regeneration of the ligand.

Drake, A. W. and S. L. Klakamp A strategic and systematic approach for the determination of biosensor regeneration conditions. Journal of Immunological Methods 371: 165-169; (2011). Goto reference

Determining the optimal conditions for surface regeneration is fundamental for performance of efficient and robust protein–protein interaction kinetic studies. We devised a systematic methodology comprised of an automated seven-cycle analyte and buffer injection Biacore scheme and data interpretation algorithm. The efficiency and utility is illustrated using an antigen/monoclonal antibody interaction that required ultimately six pulses of acid for regeneration. This technique has broad applicability to any biosensor assay that requires regeneration of a surface.