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  • Title: Bioactive Properties of Phaseolus lunatus (Lima Bean) and Vigna unguiculata (Cowpea) Hydrolyzates Incorporated into Pasta. Residual Activity after Pasta Cooking.
    Author: Drago SR, Franco-Miranda H, Cian RE, Betancur-Ancona D, Chel-Guerrero L.
    Journal: Plant Foods Hum Nutr; 2016 Sep; 71(3):339-45. PubMed ID: 27422785.
    Abstract:
    The aims of the study were to study the inclusion of P. lunatus (PLH) and V. unguiculata (VUH) protein hydrolyzates with bioactive properties into a pasta-extruded product and determine residual activity after extrusion or pasta cooking. Both protein hydrolyzates showed angiotensin-converting enzyme inhibition (ACEI) and antioxidant activity (TEAC). PLH showed higher ACEI but lower TEAC than VUH (97.19 ± 0.23 vs. 91.95 ± 0.29 % and 244.7 ± 3.4 vs. 293.7 ± 3.3 μmol Trolox/g, respectively). They were included at 5 or 10 % into wheat pasta. Control pasta had the lowest ACEI activity or TEAC (22.01 ± 0.76 % or 14.14 ± 1.28 μmol Trolox/g, respectively). Higher activity remained in pasta with PLH than VUH after extrusion, and higher the level of addition, higher the ACEI was. Pasta had practically the same ACEI activity after cooking, thus active compounds were not lost by temperature or lixiviation. Regarding TEAC, higher activity remained in pasta with 10 % VUH (31.84 ± 0.17 μmol Trolox/g). Other samples with hydrolyzates had the same activity. After cooking, pasta with hydrolyzates had higher TEAC values than control, but these were not modified by the level of incorporation. Moreover, the profile changed because pasta with PLH had the highest TEAC values (21.39 ± 0.01 and 20.34 ± 0.15 for 5 or 10 % hydrolyzates, respectively). Cooking decreased this activity (~ 20 %), for all samples. Although a certain loss of antioxidant activity was observed, pasta could be a good vehicle for bioactive compounds becoming a functional food.
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