The effect of Agaricus bisporus (AB) mushroom as a fat replacer in beef burgers was evaluated. Four treatments were compared: control (0% AB, 20% fat) and 3 treatments with partial fat replacement: AB 5% (5% AB, 15% fat); AB 10% (10% AB, 10% fat); AB 15% (AB 15%, 5% fat). Mushroom addition increased moisture content and yield and decreased cooking loss and diameter reduction of the burgers. Formulations with the highest AB concentrations were lighter and redder than the control. AB incorporation affected texture, resulting in less hard and less chewy products. In general, lipid oxidation increased during the storage time, however the lowest values were observed in AB 15%, i.e. the lowest fat content and the presence of AB increased the oxidative stability. AB 10% and AB 15% had good overall liking and were sensorially characterized as juicy, tender and flavorsome burgers. The partial replacement of animal fat by AB is a promising strategy for developing a low-fat burger.
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