ASSESSMENT OF DIETARY FIBER, ISOFLAVONES AND PHENOLIC COMPOUNDS WITH ANTIOXIDANT AND ANTIMICROBIAL PROPERTIES OF QUINOA (Chenopodium quinoa Willd.

ANTONIO VEGA-GÁLVEZ; LILIANA ZURA; MARIANE LUTZ; ROSA JAGUS; MARIA VICTORIA AGUERO; ALEX PASTEN; DI SCALA KARINA; ELSA URIBE

CHILEAN JOURNAL OF AGRICULTURAL RESEARCH

INST INVESTIGACIONES AGROPECUARIAS

Lugar: Chillán; Año: 2018 vol. 34 p. 1 - 11

0718-5820

The consumption of quinoa (Chenopodium quinoa Willd.) has been steadily increasing due toits high nutritional value and health benefits associated with its high antioxidant capacity. Theobjective of this study was to determine the contents of dietary fiber, polyphenols, flavonoids andisoflavones, and how they contribute to the antioxidant and antimicrobial activity of six ecotypesof quinoa cultivated in three different zones of Chile. The ecotypes studied were: Ancovinto andCancosa (Northern zone), Cáhuil and Faro (Central zone), and Regalona and Villarrica (Southernzone). The results indicate that all Chilean quinoa ecotypes could be considered as good sources ofdietary fiber (12.23 g 100 g-1 dry matter) and polyphenols (161.32 mg Gallic Acid Equivalents (GAE)100 g-1 dry matter). The North and Central ecotypes exhibited the highest isoflavone concentration.The Northern Cancosa was the ecotype that showed the highest flavonoid content (211.06 mg CatechinEquivalents (CAE) 100 g-1 dry matter). Based on the ORAC (Oxygen Radical Absorbance Capacity)assay, Ancovinto, Cancosa and Faro presented the highest antioxidant capacity (67.6 mmol TroloxEquivalents (TE) 100 g-1 dry matter). Regarding antimicrobial activity, Regalona ecotype showed thebest performance against Saccharomyces cerevisiae and Listeria innocua. The bioactive compoundsfound in this study add new knowledge to the antioxidant and antimicrobial activity of Chileanquinoa seeds.