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Trabajos de Investigación
Efeito do processamento na atividade antioxidante do grão de amaranto (Amaranthus cruentus L. BRS-Alegria)
Yara Severino de Queiroz, Rosana Aparecida Manólio Soares, Vanessa Dias Capriles, Elizabeth Aparecida Ferraz da Silva Torres, José Alfredo Gomes Áreas
Departamento de Nutrição. Faculdade de Saúde Pública Universidade de São Paulo (USP). Brasil
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SUMMARY
Effect of processing on the antioxidant activity of amaranth grain.
Amaranth has attracted increasing interest over recent decades because of its nutritional, functional and agricultural characteristics. Amaranth grain can be cooked, popped, toasted, extruded or milled for consumption. This study investigated the effect of these processes on the antioxidant activity of amaranth grain. Total phenolic content and in vitro antioxidant activity were determined according to two methods: inhibition of lipid oxidation using the b-carotene/linoleic acid system and the antioxidant activity index using the Rancimat® apparatus. The processing reduced the mean total phenolics content in amaranth grain from 31.7 to 22.0 mg of gallic acid equivalent/g of dry residue. It was observed that the ethanol extract from toasted grain was the only one that presented a lower antioxidant activity index compared with the raw grain (1.3 versus 1.7). The extrusion, toasting and popping processes did not change the capacity to inhibit amaranth lipid oxidation (55%). However, cooking increased the inhibition of lipid oxidation (79%), perhaps because of the longer time at high temperatures in this process (100°C/10 min). The most common methods for processing amaranth grain caused reductions in the total phenolics content, although the antioxidant activity of popped and extruded grain, evaluated by the two methods, was similar to that of the raw grain. Both raw and processed amaranth grain presents antioxidant potential. Polyphenols, anthocyanins, flavonoids, tocopherols, vitamin C levels and Maillard reaction products may be related to the antioxidant activity of this grain.
Key words: Amaranthus cruentus, total phenolics, antioxidant activity, processing.
Recibido: 26/08/2008
Aceptado: 11/08/2009
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PRIVACIDAD | ACCESIBILIDAD
ALAN-VE ISSN 0004-0622 - Depósito Legal: pp 199602DF83
Sociedad Latinoamericana de Nutrición
Producción editorial en Venezuela: Capítulo Venezolano - RIF: J-30843129-0
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