Purification of xanthurenic acid-insuline complex

Tritium labeled xanthurenic acid (XA)-insulin complexes A and B were obtained. These were shown to be one component by the disc electrophoresis, and bound XA was not liberated by the electrophoresis from the paper electrophoresis experiment. The result of the gel filtration showed that the molecular weight of the complex A and B was 24,000. But there is still a possibility that complex B might be contaminated with free insulin.