Related Experiment Videos
Quantitative analysis of pyroglutamic acid in peptides
1Nisshin Flour Milling Company, Limited, Saitama, Japan. suzukiyo@mail.ni-net.co.jp
Journal of Agricultural and Food Chemistry
|December 20, 1999
Summary
A new method simplifies pyroglutamic acid determination in peptides using enzymatic cleavage and HPLC. This technique accurately quantifies N-terminal pyroglutamate in various peptide sizes.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Enzymology
Background:
- N-terminal pyroglutamic acid is common in peptides and proteins.
- Accurate quantification of pyroglutamic acid is essential for peptide characterization.
- Existing methods for pyroglutamic acid determination can be complex and time-consuming.
Purpose of the Study:
- To develop a simplified and rapid procedure for determining N-terminal pyroglutamic acid in peptides.
- To utilize enzymatic cleavage with a thermostable pyroglutamate aminopeptidase.
- To employ isocratic High-Performance Liquid Chromatography (HPLC) with column switching for separation.
Main Methods:
- Enzymatic cleavage of N-terminal pyroglutamate using pyroglutamate aminopeptidase from Pyrococcus furiosus.
- Isocratic HPLC separation of the enzymatic hydrolysate.
- Utilizing a column switching technique for enhanced separation efficiency.
Main Results:
- The developed method efficiently cleaves N-terminal pyroglutamic acid residues from peptides.
- Pyroglutamate aminopeptidase demonstrated effectiveness across a wide range of peptide molecular weights (362.4 to 4599.4 Da).
- Over 85% of pyroglutamate was cleaved from the tested peptides.
Conclusions:
- A novel, simplified, and rapid method for quantitative determination of N-terminal pyroglutamic acid in peptides has been established.
- The method is robust and applicable to peptides of varying molecular weights.
- This technique offers a valuable tool for peptide analysis and characterization.