Unexpected variations in the effects of ultrasound-assisted myofibrillar protein processing under varying viscosity conditions

[Display omitted] •The exceedingly acidic pH environment prevented the MRN/GAD3 group from exhibiting the maximum fluorescence.•Surface tension exhibited a more significant effect than viscosity.•It was confirmed that protein systems with high viscosity are more stable.•The hydrophobicity of the MRN/GAD3 system was altered by modifications. The efficient synthesis of myofibrillar protein(MRN)-gallic acid (GAD) complex in ultrasound (UID)-assisted processing is a challenging problem in food manufacturing. In this investigation, the effect of viscosity characteristics on the efficiency of UID processing in MRN-based beverages was analyzed. Both viscosity and surface tension can increase sono-physico-chemical effects on the degradation of terephthalic acid and crystal violet, with surface tension having a more significant effect (negative correlation, R2 = 0.99) than viscosity (positive correlation, R2 = 0.79). The structural indicators and microstructure demonstrated that the reaggregation and refolding of the MRN structure during the modification procedure occurred with relatively small three-dimensional dimensions. Compared to the MRN/GAD4 group, the water contact angle of the MRN/GAD7 system enhanced by 129.44%, leading to greater system stability. The ABTS-scavenging capacity of the system increased by approximately 19.45% due to the increase in viscosity of these two categories.