“…After heat treatment, the FI of HPI‐EGCG covalent complexes tended to decrease, and the fluorescence emission wavelength displayed a certain degree of red shift. The maximum fluorescence emission displaying a red shift, and the high quenching of tryptophan fluorescence, were hallmarks of protein folding denaturation, which indicated that the tertiary structure of HPI underwent some degree of stretching 40 . Furthermore, the λ max of the EGCG‐HPI complex exhibited a gradual decrease with increasing temperature, suggesting that EGCG induced a progressively intensified fluorescence quenching effect on HPI.…”