D 1308 (OTTO) Dextran, 40000 Cas 9004-54-0 - used in the development of new improved preservation solutions for organ transplantation. Dextran 40 may be used to determine cell tightness and flux parameters across cell layers. D 1308 (OTTO) Dextran, 40000 Cas 9004-54-0 - used as a colloidal plasma volume extender.