title: Angiotensin I-Converting Enzyme inhibitory and antioxidant activities and surfactant properties of protein hydrolysates as obtained of Amaranthus hypochondriacus L. grain.
abstract: Even though some research has been carried out on surfactant properties of amaranth protein hydrolysates, their bio-functionality has not been studied yet. In this work amaranth grain Alb 1 and Glob were hydrolyzed (Alb 1H, Glob H) and foams and emulsions at optimal conditions (t, E/S, pH5) were prepared in order to assess techno-functional properties such as foaming (F) and emulsifying (E) (capacity (C) and stability (S)). FC and EC were much better for Glob H than for Alb H. Angiotensin I-converting enzyme-inhibitory activity was higher for Alb 1H (roughly 50 %) than that of Glob H (roughly 30 %). Scavenging of radicals activity (DPPH· or ABTS· (+) ) of Alb 1H and Glob H, at 2 mg/mL, was similar (approx. 40 %), but lower than Alb 1 (approx. 70 %), which was the best antioxidant. The low reducing power showed that hydrolysates barely donate an electron or hydrogen. Chelating activity on Cu(2+) was lower than that exhibited by Fe(2+,) which was remarkable, approx. 80 % as long as DH% > 10 %, where hydrolysates displayed high solubility (Alb 1H = 85 %, Glob H = 70 %) because of occurrence of 1-10 kDa peptides. Amaranth foams and emulsions prepared with protein hydrolysates have a potential as a nutraceutical food.
authors.affiliation: Departamento Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco, No. 186, Col. Vicentina, Ap. P. 55-535, Deleg. Iztapalapa, 09340 Mexico City, Mexico.
authors.forename: J
authors.initials: J
authors.lastname: Soriano-Santos
authors.affiliation: Departamento Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco, No. 186, Col. Vicentina, Ap. P. 55-535, Deleg. Iztapalapa, 09340 Mexico City, Mexico.
authors.forename: H
authors.initials: H
authors.lastname: Escalona-Buendía
keywords: ACE-inhibition; Amaranth; Antioxidant; Hydrolysate; Surfactant
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