PURIFICATION OF THE TWO IONIC FORMS OF SOMATOMEDIN C (INSULIN-LIKE GROWTH FACTOR 1)

摘要

Two different ionic forms of somatomedin C (pI 6.7-7.0 and pI 8.3-8.6) can be isolated substantially free of each other by applying an aqueous solution of purified or partially purified somatomedin C containing both ionic forms at a pH of about 4.5 to 6.5 to a strong cation-exchange column, eluting the somatomedin C from the column by applying an aqueous salt gradient at an essentially constant pH and recovering the two ionic forms in different eluant fractions.