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(A) Schematic illustration of the pH-cycle technique for fabricating protein-based composite nanoparticles with hydrophobic WPI and hydrophilic SPI. (B) Photographs of protein solutions and composite nanoparticles after the pH-cycle treatment. (C) Photographs of sample supernatants by centrifuging at 10,000 × g and 4°C for 20 min (1:0.1, 1:0.5, 1:1 represents walnut protein and soy protein isolate at the ratio of WPI:SPI = 1:0.1, 1:0.5, 1:1, respectively).
