Improvement of Starch Extraction Conditions From Agro‐Industrial Residues in Ubá Mango

ABSTRACT The mango var. Ubá is one of the most used fruits for industrial juice production. As a result, tons of waste are discarded every year. Given the valorization potential of this agro‐industrial residue, the present work aimed to improve the methodology for extracting starch from mangoes. An initial screening study tested the main parameters influencing starch extraction yield by a 24−1 fractional design. Then, a composite center design was applied to evaluate the effects of two independent variables: incubation time (X1: 17.95 –32.05 h) and NaHSO3 concentration (X2: 0.219% – 0.501%) on the starch extraction yield. The best yield (59.7%) was obtained with reduced incubation time and NaHSO3 concentration. Chemical composition and amylose determination were performed, revealing a material with a high amylose content (36.6%). Particle size showed monomodal behavior, with an oval to elliptical shape and a Type A crystalline pattern. FTIR, thermal, swelling power, and solubilization index analyses were performed. According to the results obtained, the mango var. Ubá residue presents the necessary characteristics to be a promising source of biopolymers.