PHARMACOWALA

 Colloidal dispersion is derived from two words "colloidal" and 'dispersion"."colloidal" means "colloids" and "dispersion" means "spreading". So colloidal dispersion is a system in which colloids particle or dispersed particles (also known as internal phase) are spreading or uniformly distributed in the dispersion medium (external phase or continuous phase). Colloidal dispersion is a homogeneous and heterogeneous system, depending upon particle size time it may be homogeneous and sometimes it may be heterogeneous. If the particle size of the dispersion phase is (<0.01 mm) examples are urea, oxygen gas, sucrose, and ions are these types of system known as homogeneous systems and it looks like a "true solution". If the particle size of the dispersion phase is (0.5 to 1.0 mm) examples are insulin, acacia, albumin, and silver sols are these types of systems known as heterogeneous systems or phases and the appearance of

Definition:-   Colloidal dispersion is derived from two words colloidal+dispersion. "colloidal" means "colloid" and "dispersion" means "spreading". The term colloid implies stickiness means (a  glue-like substance in Greek) and a colloidal system is a dispersion phase which means internal phase and dispersed in the  external phase . And colloidal are polyphasic systems and the particle size of the colloidal system is  (1nm-1mm)  they are dispersed in a dispersion medium that is a large amount and called an external phase. Dispersion phase+Dispersion medium=Colloidal (heterogeneous system) (glue-like). Official preparation of colloidal system:- The official preparation of the colloidal system is meant for parenteral use they are:- 1. Iron dextran injection (BP):- In this type of official preparation of colloidal system dextran complexes with ferric ions and used in the treatment of anaemia and are meant for intramuscular use. 2. Iron sorbitol