Structure-Function Guided Extraction and Scale-Up of Pea Protein Isolate Production

Area of Science:

• Food Science
• Protein Chemistry
• Biotechnology

Background:

• Commercial pea protein isolate (cPPI) often exhibits poor functionality due to inadequate extraction control and scale-up challenges.
• Existing methods struggle to balance protein yield, purity, and structural integrity.

Purpose of the Study:

• To optimize pea protein extraction conditions for enhanced purity, yield, and functionality.
• To evaluate the scalability of benchtop extraction methods for industrial application.
• To compare the structural and functional properties of pea protein isolates (PPI) produced under different conditions versus cPPI.

Main Methods:

• Mild alkaline solubilization with isoelectric precipitation.
• Salt solubilization coupled with membrane filtration (ultrafiltration/diafiltration).
• Structure-function characterization of pea protein isolates.

Main Results:

• Both optimized methods achieved high protein yield (>64%) and purity (>87%).
• Pea protein isolates (PPI) demonstrated superior solubility, gelation, and emulsification compared to cPPI.
• Scalability under mild conditions reduced structural differences between pH- and salt-extracted PPI, yielding functional isolates.

Conclusions:

• Double solubilization at mild pH (7.5) is a viable alternative to high-alkalinity methods for preserving structural integrity.
• Salt extraction coupled with membrane filtration is scalable for industrial production.
• Controlled, mild-condition scale-up yields functional pea protein ingredients comparable or superior to cPPI.