Active Time
30-45 minutes
Total Project Time
30-45 minutes
Key Concepts
Chemical reaction, enzymes

Introduction

Have you ever gone to pour yourself a cup of milk, and all you get is clumps? What happened to the milk is called coagulation, which is the mechanism that occurs when proteins in the milk clump together. While you do not necessarily want this in your milk, without coagulation (or curdling), there would be no cheese or yogurt, which is why it is a very important process in the food industry. Wonder how you can make milk curdle? Do this activity to find out!

Credits

Svenja Lohner, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.

Materials

  • Pineapple (fresh)
  • Teaspoon
  • Tablespoon
  • Knife
  • Cutting board
  • Cheesecloth or a piece of cotton fabric (2)
  • Microwavable containers or cups (2)
  • Fresh cow's milk, any percent but not evaporated (room temperature)
  • Paper towels
  • Microwave
  • Permanent marker
  • Mini cups, about 2 oz. (5)
  • Adult helper
  • Optional: timer
    Materials needed for the lesson 'Milk curdling with Enzymes'

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Active Time
30-45 minutes
Total Project Time
30-45 minutes
Key Concepts
Chemical reaction, enzymes
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