Lupin seeds storage protein composition and their interactions with native flavonoids

Area of Science:

• Food Science
• Nutritional Biochemistry
• Plant Biochemistry

Background:

• Lupin seeds are rich in proteins and phenolic compounds, beneficial for human nutrition.
• Interactions between lupin proteins and phenolic compounds can form complexes, altering their properties.
• Understanding these interactions is crucial for optimizing lupin's nutritional value.

Purpose of the Study:

• To investigate the composition of storage proteins in Lupinus albus and Lupinus angustifolius.
• To analyze the interactions between lupin seed storage proteins and native flavonoids.
• To identify specific protein fractions and flavonoids involved in these interactions.

Main Methods:

• Chromatographic separation of lupin seed storage proteins.
• Identification of protein fractions using established methods.
• Analysis of flavonoid composition and their interaction with protein fractions.

Main Results:

• Six protein fractions were identified in lupin seeds, with α-conglutin and β-conglutin being dominant (80%).
• Three apigenin C-glycoside flavonoids were found to interact with lupin proteins.
• Over 90% of flavonoids interacted with late-embryogenesis abundant (LEA) proteins, not main storage proteins.

Conclusions:

• Protein-phenolic complexes in lupin seeds can affect protein digestibility and flavonoid bioavailability.
• These interactions can modify the functional and nutritional properties of lupin-based foods.
• Further research is needed to optimize the utilization of lupin proteins and flavonoids for human nutrition.