What are some examples of protein thickeners?

• A. Acacia, Pectin
• B. Gelatin, Egg Yolk, Casein
• C. Sorbitan Esters
• D. Bacterial Agents

Answer: (B)

Proteins thickening works by forming a hydrated network that traps water, increasing the viscosity of the system. Gelatin, egg yolk, and casein are classic protein thickeners because they are proteins that readily hydrate and, under heat or with changes in pH or salt, form gels or interconnected networks. Gelatin, derived from collagen, dissolves in hot water and gels on cooling, giving a thick, gel-like structure. Casein, the main milk protein, can form a network when heated or acidified, helping dairy products and emulsions become thicker. Egg yolk contains proteins that denature and interact to create thicker emulsions and higher viscosity, which is why it’s used to improve texture in sauces and custards. The other options rely on non-protein mechanisms: acacia and pectin are polysaccharide thickeners that thick en by long carbohydrate chains; sorbitan esters act as emulsifiers rather than thickeners; bacterial agents aren’t typically used as protein thickeners.