How do I perform quality control of the conjugation process?

Characterization using LC-MS will give a complete and clear picture of mass shift associated with successful conjugation if the antibody is analyzed reduced or fragmented. LC or LC-MS analysis of HC from a reduced sample or scFc fragments generated by FabRICATOR digestion provides distinct elution peaks for conjugated scFc or mass shifts corresponding to the degree of labelling (DOL) following conjugation. On the application page you can see an example of such analysis. Analysis of fluorescently labeled antibodies can also be performed by absorbance measurements and calculate the DOL using the Extinction coefficient for the antibody and the label and the correction factor for the label.