Related Experiment Video
Updated: May 9, 2026
11:14
Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders
Published on: April 14, 2015
Whey protein isolate polydispersity affects enzymatic hydrolysis outcomes
I B O'Loughlin1, B A Murray, A Brodkorb
1Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.
Food Chemistry
|July 23, 2013
Summary
Heat treatment of whey protein isolate (WPI) enhances enzymatic hydrolysis, releasing more essential amino acids and unique peptides. This combined approach offers control over protein breakdown for targeted applications.
Area of Science:
- Food Science
- Biochemistry
- Protein Chemistry
Background:
- Whey protein isolate (WPI) is a valuable protein source.
- Understanding protein denaturation and enzymatic hydrolysis is crucial for food processing.
- Heat treatment can alter protein structure and functionality.
Purpose of the Study:
- To investigate the impact of heat-induced denaturation on WPI enzymatic hydrolysis.
- To analyze the release of amino acids and peptides from heated and unheated WPI.
- To identify specific cleavage sites and protease activities.
Main Methods:
- Heat treatment of WPI dispersions at 80 °C for 10 minutes.
- Enzymatic hydrolysis to a 5% degree of hydrolysis (DH).
- Analysis of amino acid release and peptide identification using LC-MS/MS.
Main Results:
- Heat-treated WPI hydrolysis yielded higher levels of essential amino acids (lysine, phenylalanine, arginine).
- LC-MS/MS identified 23 distinct peptides, primarily from beta-lactoglobulin (β-Lg).
- Specific cleavage points were associated with serine endo-protease activities.
Conclusions:
- Substrate heat pre-treatment combined with enzymology can effectively influence proteolysis.
- This approach allows for targeted production of unique peptides and amino acid release.
- Optimized WPI processing can enhance nutritional value and functional properties.
Related Concept Videos
01:10Polymers: Molecular Weight Distribution
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
01:21Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
01:27SDS-PAGE
Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...
01:15Hydrolysis
Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...