Facile synthesis of alcalase-inorganic hybrid nanoflowers used for soy protein isolate hydrolysis to improve its functional properties

In this work, a facile approach was developed to synthesized alcalase-inorganic hybrid nanocomposite (alcalase@CaHPO 4 ) by immobilizing alcalase with calcium hydrogen phosphate (CaHPO 4 ). The nanocomposite possessed flower-like morphological features with excellent hydrolysis activity on soybean protein isolates (SPI) with 1.57 fold higher compared to free alcalase. The experiment was evident of alcalase@CaHPO 4 hybrid nanoflowers with 90% sustainability after the seven cycles of reusability and 80–100% relative activity at 50–70 °C and with 65% at pH 4 in acidic condition. Soybean protein hydrolysates (SPHs) produced by immobilized alcalase possessed 70% radical-scavenging capacity at 0.8 mg/mL concentration and 20% calcium-binding capacity at pH 6. The solubility of SPHs produced by alcalase@CaHPO 4 hybrid nanoflowers was also improved by 15% compared to free alcalase. The high radical scavenging capability, good calcium binding capacity and improved solubility of SPHs prepared through alcalase@CaHPO 4 hybrid nanoflowers would be highly promising in food industries.