Naglezi de Menezes Lovatto
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Bruno Bianchi Loureiro
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Ana Betine Beutinger Bender
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Cristiane Bianchi Loureiro
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Fernanda Rodrigues Goulart
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ABSTRACT: Response surface methodology was used to determine optimum conditions for extraction of protein from pumpkin seed meal. A central composite rotational design (CCRD) including independent variables such, pH and sodium trimetaphosphate (STMP) content was used. Maximum yield was obtained at a central point of CCRD, with STMP content and pH of 4% and 4.5, respectively. These conditions resulted in protein yield of 50.04 g of soluble protein from extract/100 g pumpkin seed. The optimization of pH and STMP content allowed obtaining a product with a high protein concentration (62.56 g 100 g-1), digestibility (62.03 g 100 g-1) and concentration of essential amino acids (27.26 g 100 g-1). Regarding the polyphenols concentration, phosphorylated protein concentrate from pumpkin seed and the pumpkin seed meal presented 13.11 g 100 g-1 and 23.19 g 100 g-1, respectively. The adequacy of the model was confirmed by extracting the protein under optimum values. These results help in designing the process of optimal protein extraction from pumpkin seeds.
OPTIMIZATION OF ULTRASOUND-ASSISTED ALKALINE EXTRACTION OF PUMPKIN SEED MEAL PROTEIN ISOLATE BY RESPONSE SURFACE METHODOLOGY
