Related Experiment Videos
A chemical method to isolate hypothalamic nonapeptides by coupling cyst(e)in with bimane
S B Catrina1, M Coculescu, M Andersson
1Department of Endocrinology II, University of Medicine and Pharmacy Carol Davila, Bucharest, Romania. s_catrina@hotmail.com
Journal of Cellular and Molecular Medicine
|June 18, 2002
Summary
A new HPLC method using fluorescent derivatization with monobromobimane (mBBr) simplifies the detection of vasopressin and oxytocin. This sensitive technique offers a significant improvement over traditional assays for these important nonapeptides.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Peptide Science
Background:
- Vasopressin, oxytocin, and related nonapeptides are challenging to isolate from biological tissues.
- Traditional detection methods like bioassays and immunoassays are cumbersome, lack commercial availability, and suffer from cross-reactivity.
Purpose of the Study:
- To develop a simple, sensitive, and specific method for detecting active nonapeptides.
- To overcome the limitations of existing assays for vasopressin, oxytocin, and similar peptides.
Main Methods:
- High-performance liquid chromatography (HPLC) coupled with pre-column fluorescent derivatization.
- Utilized monobromobimane (mBBr) for fluorescent labeling of peptides.
- Employed Tris (2-carboxyethyl) phosphine (TCEP) for peptide reduction and a Vydac C18 column for separation.
Main Results:
- Successfully detected specific peaks for arginine-vasopressin, lysine-vasopressin, and vasotocin.
- Achieved detection levels as low as 10 pmol for these nonapeptides.
- Demonstrated the method's sensitivity and specificity.
Conclusions:
- The developed HPLC method with mBBr derivatization provides a robust and efficient way to detect cyst(e)ine-containing nonapeptides.
- This technique offers a significant advancement for researchers studying vasopressin, oxytocin, and related signaling molecules.
- The method's simplicity and sensitivity make it applicable to a broader range of active peptides with cysteine residues.