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Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
Published on: March 4, 2017
Scanning calorimetric studies on offal protein isolates.
1Department of Applied Biochemistry and Food Science, School of Agriculture, University of Nottingham, Sutton Bonington, Loughborough, Leicestershire, LE 12 5RD, Great Britain.
Meat Science
|November 8, 2011
Summary
Differential scanning calorimetry revealed that defatting bovine lung and rumen protein isolates with various solvents did not alter phase transitions. However, non-defatted rumen isolates showed reversible phase transitions, unlike petroleum ether-extracted samples.
Area of Science:
- Biochemistry
- Thermodynamics
- Proteomics
Background:
- Proteins from bovine lung and rumen are crucial for various biological functions.
- Understanding protein behavior under different extraction conditions is vital for biochemical analysis.
- Differential scanning calorimetry (DSC) is a key technique for studying protein thermal stability.
Purpose of the Study:
- To investigate the effect of solvent-based defatting on the thermal phase transitions of bovine lung and rumen protein isolates.
- To determine if the observed phase transitions are reversible and influenced by the defatting process.
Main Methods:
- Proteins were isolated from bovine lung and rumen.
- Isolates were defatted using a series of solvents with increasing polarity.
- Differential scanning calorimetry (DSC) was employed to analyze phase transitions.
- Reversibility of phase transitions was assessed after incubation at specific temperatures.
Main Results:
- Defatting with solvents of increasing polarity yielded similar phase transition profiles for both lung and rumen protein isolates.
- Original, non-defatted rumen isolates exhibited reversible phase transitions upon incubation (303-313 K).
- This reversibility was lost after petroleum ether extraction and could not be replicated by re-mixing defatted proteins with extracted fats.
Conclusions:
- The defatting process, particularly with petroleum ether, significantly impacts the thermal behavior and reversibility of phase transitions in bovine protein isolates.
- Lipid-protein interactions may play a role in the observed reversible thermal transitions in non-defatted rumen isolates.
