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The Fourier transform infrared spectroscopy of native OVA, T-OVA-EGCG conjugates, and U-OVA-EGCG conjugates. OVA: native ovalbumin; T-OVA-EGCG: ovalbumin-epigallocatechin-3-gallate conjugates prepared by traditional free radical treatment; U-OVA-EGCG30, U-OVA-EGCG60, U-OVA-EGCG90, and U-OVA-EGCG120: the ultrasound-assisted free radical of OVA-EGCG conjugates prepared under different ultrasonic response times of 30 min, 60 min, 90 min, and 120 min, respectively.
