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Food Science and Technology QUESTION #5980
Question 1
Casein can be industrially produced from skim milk by which method?
  • Centrifugal separation; used as a color in paints
  • Acid precipitation at \(\text{pH}\;4.6\) (acid casein) or rennet coagulation (rennet casein), followed by washing, pressing, and drying; used in food products (cheese analogs, protein supplements) and non-food applications (adhesives, paper coating, textiles)✔️
  • Evaporation followed by spray drying; used as infant formula base
  • Microfiltration; used as a beverage protein supplement
Correct Answer Explanation
Casein production: skim milk \(\rightarrow\) acid precipitation at \(\text{pH}\;4.6\) or rennet treatment \(\rightarrow\) whey drainage \(\rightarrow\) washing (to remove lactose, minerals) \(\rightarrow\) pressing \(\rightarrow\) drying. Food uses: cheese analogs, protein supplements, coffee whiteners. Industrial uses: paper coating, adhesives, leather finishing.