Carboxymethyl Cellulose ( Cmc) Or Cellulose Gum[ 1] Is A Cellulose Derivative With Carboxymethyl Groups ( -Ch2-Cooh) Bound To Some Of The Hydroxyl Groups Of The Glucopyranose Monomers That Make Up The Cellulose Backbone. It Is Often Used As Its Sodium Salt, Sodium Carboxymethyl Cellulose