| Videos: 16 results |
Denaturation of Protein by Strong Acid John W. Moore, Jerrold J. Jacobsen, Gary Trammell, Kristin Johnson
"Strong acid denatures egg white proteins.This video contains voiceover:""The tertiary structure of egg white proteins is held together by hydrogen bonding and hydrophobic interactions. Adding strong acid to the protein disrupts the intermolecular forces, and the tertiary structure is lost. The loss in protein structure is called denaturation. The proteins precipitate, forming a white solid."""
Acids / Bases |
Proteins / Peptides
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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.
Proteins / Peptides
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Nature of Proteins
Effect of pH on solubility, denaturing proteins, hydrolysis in strong base, binding to coomassie blue, dying wool and cotton, gel filtration column, reaction of ninhydrin with amino acids and precipitating protein with ammonium sulfate are demonstrated.
Proteins / Peptides
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Hydrolysis of Protein in Strong Base
Concentrated sodium hydroxide causes wool and hair to dissolve.
Amino Acids |
Proteins / Peptides
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Carbohydrates
Dehydration of sucrose, Fehling's test, Benedict's test, osazone formation, destructive distillation of wood, oxidation of sucrose with potassium chlorate, and guncotton are demonstrated.
Carbohydrates
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Denaturing Proteins
Egg white proteins are denatured by acid, lead solution, and heat.
Noncovalent Interactions |
Proteins / Peptides
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Factors Affecting Glucose Oxidase Activity
Various factors which affect glucose oxidase activity are demonstrated.
Catalysis |
Enzymes |
Kinetics |
Proteins / Peptides
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Halting the Briggs-Rauscher Oscillating Reaction
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.
Catalysis |
Kinetics |
Enzymes |
Proteins / Peptides
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HIV-1 Protease: An Enzyme at Work
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
Applications of Chemistry |
Enzymes |
Proteins / Peptides |
Medicinal Chemistry
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Polyurethane Foam in Micro Gravity
Polyurethane foam is formed in micro gravity (NASA Reduced Gravity Program).
Polymerization
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Metallocene Catalyzed Polymerization of Ethylene
Polymerization chemistry is demonstrated by the reaction between ethylene and a Ziegler-Natta catalyst.
Polymerization |
Catalysis |
Reactions
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Formaldehyde Copolymers
Formaldehyde Copolymers
Electrophilic Substitution |
Phenols |
Polymerization
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Sucrose Dehydration gives Sulfur Dioxide
Sulfuric acid dehydrates sucrose forming carbon.
Carbohydrates |
Oxidation / Reduction |
Reactions
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Benedict's Test for Reducing Sugars
Tests for glucose, sucrose, and fructose.
Carbohydrates |
Oxidation / Reduction |
Qualitative Analysis
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Polymers
Formation of formaldehyde copolymers, nylon rope, high and low density polyethylene, combustion of polyethylene and polystyrene, Beilstein test, formation of solid latex, cleaning oil spills, slime, solid foams, super absorbent polymer, formation of polyurethane foam under normal and micro gravity, and construction of a rod climbing apparatus are demonstrated.
Polymerization |
Reactions |
Applications of Chemistry |
Consumer Chemistry
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Formation of Carbon from Carbohydrate
Sulfuric acid has a very high affinity for water. It is shown to dehydrate a carbohydrate (sucrose) forming carbon. Sulfuric acid is reduced to sulfur dioxide, which bleaches a rose petal.
In a second experiment, the sulfur dioxide reduces purple permanganate to nearly colorless manganese(II).
Acids / Bases |
Carbohydrates |
Oxidation / Reduction |
Reactions
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