biostudies-literatureUnknown12(28)Tao XIn this research, ovalbumin (OVA) and sodium alginate (SA) were used as the materials to prepare an OVA-SA composite carrier, which protected and encapsulated the hydrophobic kaempferol (KAE) and the hydrophilic tannic acid (TA) (OVA-SA, OVA-TA-SA, OVA-KAE-SA, and OVA-TA-KAE-SA). Results showed that the observation of small diffraction peaks in carriers proved the successful encapsulation of KAE/TA. The protein conformation of the composite nanoparticles changed. OVA-TA-SA composite nanoparticles had the highest α-helix content and the fewest random coils, so the protein structure of it had the strongest stability. OVA-TA-KAE-SA composite nanoparticles had the strongest system stability and thermal stability, which might be due to the synergistic effect of the two polyphenols, suggesting the encapsulation of KAE/TA increased the system stability and the thermal stability of OVA-SA composite nanoparticles. Additionally, the composite nanoparticles were endowed with antioxidant ability and antibacterial ability (against <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>) in the order OVA-TA-SA > OVA-TA-KAE-SA > OVA-KAE-SA based on the difference in antibacterial diameter (<i>D</i>, mm) and square (<i>S</i>, mm²), indicating that polyphenols enhanced the antibacterial and antioxidant ability of OVA-SA composite nanoparticles, and the enhancement effect of TA was stronger than that of KAE. These results provide a theoretical basis for the application of OVA-SA composite nanoparticles in the delivery of bioactive compounds.RSC advances18115-18126https://www.ebi.ac.uk/biostudies/studies/S-EPMC9245490biostudies-literatureUnderstanding of physicochemical properties and antioxidant activity of ovalbumin-sodium alginate composite nanoparticle-encapsulated kaempferol/tannin acid.PMC9245490Tao XCai LShi HCao AfalseUnderstanding of physicochemical properties and antioxidant activity of ovalbumin-sodium alginate composite nanoparticle-encapsulated kaempferol/tannin acid.In this research, ovalbumin (OVA) and sodium alginate (SA) were used as the materials to prepare an OVA-SA composite carrier, which protected and encapsulated the hydrophobic kaempferol (KAE) and the hydrophilic tannic acid (TA) (OVA-SA, OVA-TA-SA, OVA-KAE-SA, and OVA-TA-KAE-SA). Results showed that the observation of small diffraction peaks in carriers proved the successful encapsulation of KAE/TA. The protein conformation of the composite nanoparticles changed. OVA-TA-SA composite nanoparticles had the highest α-helix content and the fewest random coils, so the protein structure of it had the strongest stability. OVA-TA-KAE-SA composite nanoparticles had the strongest system stability and thermal stability, which might be due to the synergistic effect of the two polyphenols, suggesting the encapsulation of KAE/TA increased the system stability and the thermal stability of OVA-SA composite nanoparticles. Additionally, the composite nanoparticles were endowed with antioxidant ability and antibacterial ability (against <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>) in the order OVA-TA-SA > OVA-TA-KAE-SA > OVA-KAE-SA based on the difference in antibacterial diameter (<i>D</i>, mm) and square (<i>S</i>, mm²), indicating that polyphenols enhanced the antibacterial and antioxidant ability of OVA-SA composite nanoparticles, and the enhancement effect of TA was stronger than that of KAE. These results provide a theoretical basis for the application of OVA-SA composite nanoparticles in the delivery of bioactive compounds.2022-01-01T00:00:00Z2022 Jun2024-10-17T13:50:03.827Z2024-10-17T13:50:03.827ZS-EPMC92454903587403110.1039/d2ra02708a