Chinese quince seed proteins: sequential extraction processing and fraction characterization

Area of Science:

• Food Science
• Protein Chemistry
• Nutritional Biochemistry

Background:

• Chinese quince seeds are a potential source of plant-based proteins.
• Understanding protein composition and functionality is crucial for food applications.

Purpose of the Study:

• To extract and characterize major protein fractions (albumin and glutelin) from Chinese quince seeds.
• To evaluate their physicochemical and functional properties for potential food industry applications.

Main Methods:

• Modified Osborne method for sequential protein extraction.
• Analysis of amino acid composition, hydrophobicity, thermal stability (differential scanning calorimetry), solubility, viscosity, water holding capacity, and oil adsorption capacity.
• Circular dichroism spectroscopy for structural analysis.

Main Results:

• Albumin and glutelin were identified as major protein fractions.
• Both fractions showed adequate essential amino acid profiles, meeting WHO/FAO recommendations (except methionine).
• Glutelin exhibited higher thermal stability, water holding capacity, and oil adsorption capacity compared to albumin.

Conclusions:

• Chinese quince seed proteins (albumin and glutelin) possess favorable nutritional and functional properties.
• These proteins demonstrate potential as valuable nutrition and functional additives in the food industry.
• Further research could explore optimizing extraction and application methods.