Multi-scale ultrasound induced composite coacervates of whey protein and pullulan polysaccharide on emulsion forming and stabilizing mechanisms

• Published in: Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2024-02, Vol.234, p.113709-113709, Article 113709
• Main Authors: Qayum, Abdul, Rashid, Arif, Liang, Qiufang, Kang, Lixin, Ahmed, Zahoor, Hussain, Muhammad, Virk, Muhammad Safiullah, Ekumah, John-Nelson, Ren, Xiaofeng, Ma, Haile, Miao, Song
• Format: Article
• Language: English
• Subjects: Composite emulsion; Electrostatic interaction; Interface behavior; Molecular docking; Multi-scale ultrasound
• ISSN: 0927-7765; 1873-4367
• DOI: 10.1016/j.colsurfb.2023.113709

A non-destructive technique known as multi-scale ultrasound (MSU) was employed to modify the emulsion consisting of glycosylated bovine whey protein (WP) and pullulan (Pu). To assess the effect on the structural and emulsifying properties of the WP-Pu, the formulated emulsion, was treated with divergent MSU at (single: 20 kHz, 40 kHz, and 60 kHz; dual: 20–40 kHz, 40–60 kHz, and 20–60 kHz; and tri: 20–40-60 kHz) frequency for a duration of 30 min. The tri-frequency, treated emulsion showed improved emulsifying stability compared to the control and MSU-treated single, and dual-frequency samples, as indicated by the particle size, structural morphology, and adsorbed protein. The molecular docking and numerous spectral analysis provided evidence that WP can undergo successful phenolation. This modified form of WP then interacts with Pu through various forces, including H-bonding and other mechanisms, resulting in the formation of a composite emulsion. The rheological properties revealed that both the control emulsion and the MSU-treated emulsion exhibited non-Newtonian pseudoplastic flow behavior. This behavior is characterized by shear thinning, where the viscosity decreases with increasing shear rate. The shear rates tested ranged from 1 to 300 1/s, additionally, the degree of crystallinity increased from 18.2° to 19.4°. Overall, the tri-frequency effect was most pronounced compared to single and dual-frequency. Ultrasonication, an emerging non-thermal technology, proves to be an efficient approach for the formulation of WP-Pu composites. These composites have significant potential for use in drug delivery systems and functional foods. [Display omitted] •Multi-scale ultrasound (MSU)-assisted composite emulsion were prepared.•The interaction between whey protein-pullulan (WP-Pu) composites has been revealed.•MSU has a promising effect on physical and structural attributes of WP-Pu composite.•A flexible structure with reduced α-helix (32.6% to 10.7%), increased β-sheet, turn random coil content.•The improving mechanism of emulsifying properties of complex was revealed.