Which of the following is NOT an example of a jelly agent used in gels?

• A. Carbomer
• B. Water
• C. Natural gums
• D. Cellulose derivatives

Answer: (B)

In gels, the jelly agent is the substance that forms the three-dimensional network that traps water to create the gel. Water by itself is just the solvent; without a gel-forming polymer or thickener, it cannot develop that network. That’s why water is not a jelly agent, even though it makes up much of the gel’s volume.

Carbomer, natural gums, and cellulose derivatives are all classic gelling/thickening agents. Carbomer polymers swell and crosslink to produce a sturdy gel network. Natural gums hydrate and swell to form viscous, interconnected structures. Cellulose derivatives dissolve or swell and then entangle to generate a gel matrix. These substances provide the structural framework that holds the water in place, giving the gel its form and consistency.