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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/).
Heat map of the free amino acid content of fish broth (A) and the breakdown of the different types of free amino acids (B) by boiling water and thermo-ultrasonic treatment with different treatment times (0, 30, 60, 90, 120 min).