Abstract
Aniline (0.01 millimole) was iodinated (I131), diazotized, and reacted with polysaccharide from S. marcescens in a single reaction vessel without isolating any of the intermediates. The final product, purified by dialysis, was found to contain radioactive I which served as a label for the benzene azo groups which were attached to the polysaccharide. The product was given to a few animals for measurement of the distribution of radio[long dash]activity. It was also injd. into 3 patients with malignant tumors. Its toxicity in man was found to be similar to that of unmodified polysaccharide.