Gum acacia (gum arabic) possesses a unique arabinogalactan-protein (AGP) complex structure containing covalently attached polypeptide fractions. The hydrophobic protein anchor adsorbs strongly at the oil-water interface while the hydrophilic carbohydrate chains provide steric stabilization, making it function uniquely both as a stabilizer and an excellent natural emulsifier.

Option analysis:

• Gum acacia: Correct, its protein-polysaccharide hybrid structure gives it dual functionality as hydrocolloid stabilizer and effective emulsifier.
• Furcellaran: A sulfated galactan seaweed extract that acts only as a gelling stabilizer.
• Pectin: Hydrophilic carbohydrate stabilizer with negligible emulsifying capability in dairy fats.
• Gelatin: Animal protein stabilizer, but lacks the specialized emulsifying capacity of amphiphilic gum acacia in oil-in-water food emulsions.