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Reverse phase HPLC method for detection and quantification of lupin seed γ-conglutin
Sharmilee Mane1, Scott Bringans2, Stuart Johnson3
1Department of Chemical Engineering, Curtin University, Perth, WA, 6845, Australia.
Summary
A new reverse phase HPLC method accurately detects and quantifies gamma-conglutin in lupin seed extract. This validated method offers high precision and recovery for routine analysis of this important protein.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Food Science
Background:
- Gamma-conglutin is a major protein found in lupin seeds.
- Accurate quantification of gamma-conglutin is essential for nutritional and quality assessments.
- Existing methods for gamma-conglutin analysis may lack specificity or efficiency.
Purpose of the Study:
- To develop and validate a simple, selective, and accurate reverse phase High-Performance Liquid Chromatography (HPLC) method for the detection and quantitation of gamma-conglutin.
- To confirm the identity of gamma-conglutin using complementary analytical techniques.
- To establish the method's reliability for routine analysis of lupin seed extracts.
Main Methods:
- Development of a reverse phase HPLC method using a gradient elution with water and acetonitrile containing trifluoroacetic acid.
- Confirmation of gamma-conglutin identity using tandem mass spectrometry (MS/MS) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE).
- Validation of the method for specificity, linearity, sensitivity, precision, recovery, and accuracy.
Main Results:
- A sharp and symmetric peak for gamma-conglutin was achieved with a retention time of 29.16 minutes.
- MS/MS analysis confirmed the identity of gamma-conglutin by matching data against a protein database.
- The method demonstrated excellent specificity, with no matrix interference, and high precision (intra-day and inter-day <0.5%) and accuracy (recovery >97%).
- The detection and quantitation limits were determined to be 2.68 μg/ml and 8.12 μg/ml, respectively.
Conclusions:
- The developed reverse phase HPLC method is simple, selective, accurate, and reproducible for routine analysis of gamma-conglutin in lupin seed extracts.
- The method's high precision and accuracy, confirmed by MS/MS and SDS-PAGE, make it suitable for quality control and research applications.
- This validated analytical approach facilitates reliable assessment of gamma-conglutin content in lupin-based products.
