Protein Reactions

CCA! Volume 5

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Protein Reactions

Curdling milk, decomposition of hydrogen peroxide by catalase, glucose oxidase activity, hydrolyzing of sucrose with invertase, and using an enzyme to halt the Briggs-Rauscher reaction are demonstrated. Inhibiting the enzyme HIV-1 protease may slow the spread of AIDS.

Curdling Milk

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80 seconds

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7 Slides

Milk protein is cleaved by rennin and forms curds. Larger curds form when calcium ions are added to the solution.

Decomposition of Hydrogen Peroxide by Catalase

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17 seconds

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Catalase from a slice of potato decomposes hydrogen peroxide into water and oxygen.

Factors Affecting Glucose Oxidase Activity

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Various factors which affect glucose oxidase activity are demonstrated.

Hydrolyzing Sucrose with Invertase

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57 seconds

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Invertase hydrolyzes sucrose into glucose and fructose. The hydrolysis is confirmed using Fehling's reagent.

Halting the Briggs-Rauscher Oscillating Reaction

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The Briggs-Rauscher reaction is demonstrated in three different ways. Catalase from a liver extract decomposes the hydrogen peroxide in an Briggs-Rauscher reaction, stopping the oscillations.

HIV-1 Protease: An Enzyme at Work

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This is "HIV-1 Protease: An Enzyme at Work", from a video tape published by the Journal of Chemical Education - Software as Special Issue 13