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New processing of lupin protein isolates and functional properties
1Fraunhofer-Institute for Process Engineering and Packaging, Department of Process Engineering, Giggenhauserstrasse 35, D-85354 Freising, Germany. wae@ivv.fhg.de
Die Nahrung
|November 20, 2001
Summary
Functional lupin proteins (alpha, beta, gamma-conglutin) were isolated using novel methods. These protein isolates exhibit excellent solubility and functional properties for diverse food applications.
Area of Science:
- Food Science and Technology
- Plant Protein Chemistry
Background:
- Increasing demand for functional plant-based proteins tailored for specific food applications.
- Native lupin proteins (alpha, beta, gamma-conglutin) possess inherent solubility and functional characteristics.
Purpose of the Study:
- To develop and characterize novel lupin protein isolates (Type E and F) with maintained native properties.
- To assess the functional properties of these isolates for food ingredient applications.
Main Methods:
- Hexane-deoiled lupin protein extraction.
- Alkaline extraction and acid precipitation for Type E (high molecular weight alpha, beta-conglutin).
- Cross-flow filtration using zirconium oxide membranes at pH 7-8 for Type F (gamma-conglutin enrichment).
Main Results:
- Successful isolation of lupin protein fractions (Type E and F) with high solubility.
- Type E and F isolates demonstrated outstanding emulsification, salt tolerance, and foaming properties.
- Optimized pH conditions increased filtration rates up to 70 l/m2h with zirconium oxide membranes.
Conclusions:
- Novel lupin protein isolates (Type E and F) retain native properties and offer superior functionality.
- These isolates present significant potential as versatile ingredients in various food systems.
- Pilot plant fractionation is available for these promising new lupin protein products.