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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Fluorescence emission spectra of PPI at excitation wavelengths of 280 nm (a) and 295 nm (b), and fluorescence quenching spectra plots of PPI at 298 K (c) with different EGCG concentrations.