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Biochemistry
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Biochemistry—Demonstration Kits
pH and Protein Solubility—
A Reversible Demonstration Kit
By: The Flinn Staff
Demonstrate the properties of proteins and the effect of pH on protein solubility with this colorful and reversible activity. Proteins contain many acidic and basic groups that have different structures at different pH values. When acids and bases are added to a protein solution, the solubility of the protein changes drastically. This demonstration looks at the acid-base and solubility properties of casein, the main protein in milk. The structure of the protein at different pH values is discussed. Demonstration Notes included.
Concepts: Proteins, isoelectric point, solubility, pH.
Time Required: 15 minutes
Chemicals Provided: Casein, hydrochloric acid solution, sodium hydroxide solutions, universal indicator.
Catalog No.
Description
Price/Each
AP6692
pH and Protein Solubility—
A Reversible Demonstration Kit
$23.50
pH and Protein Solubility—A Reversible Demonstration Kit AP6692
Essential Protein and Enzyme
Multi-Demonstration Kit
By: The Flinn Staff
Demonstrate the diverse scientific studies encompassing the chemical processes of living things. Essential life processes that may be under- stood using biochemical principles include cell signaling, energy and metabolism, and genetics. This set of three demonstrations teaches students about the biochemistry occurring in their own bodies.
• pH and Protein Solubility—Examine the effect of pH on the solubility and structure of casein to find its optimum value.
• Digestive Enzymes at Work—Learn how the body transforms the food we eat into essential nutrients needed to carry out cell processes and growth.
• The Floating Catalyst—Investigate the reaction of catalase, which catalyzes the decomposition of hydrogen peroxide in plant and animal tissues.
Includes enough materials to perform each of the above demonstra-
tions three times. Also comes with the Flinn ChemTopicTM Labs, Vol. 20, Biochemistry—The Molecules of Life, which contains instructions for four experiments and five demonstrations.
Concepts: Enzyme structure and function, proteins, pH.
Time Required: One class period
Materials Provided: Albumin, amylase, biuret test solution, casein,
catalase, hydrochloric acid solution, hydrogen peroxide, iodine solu- tion, pepsin, sodium hydroxide, starch, universal indicator solution, Flinn ChemTopicTM Labs, Volume 20, Beral-type pipets.
Essential Protein and Enzyme Multi-Demonstration Kit FB2015
Catalog No.
Description
Price/Each
FB2015
Essential Protein and Enzyme Multi-Demonstration Kit
$76.35
BIOCHEMISTRY—DEMONSTRATION KITS continued on next page.