FIGURE 6.

Antioxidant capacity of quinoa seeds. Black bars represent 2017 values, light gray bars show 2018 values, and 2019 values are represented by dark gray bars. (A) Antioxidant power of quinoa seeds was measured using the ferric reducing antioxidant power (FRAP) assay and is expressed as μmol of Fe²⁺per gram of seed. Statistical differences were analyzed through a Welch’s ANOVA test followed by a Games-Howell post-hoc test. (B) Total polyphenol content (TPC) is expressed as milligrams of gallic acid equivalents (GAE) per gram of seeds. The statistical analysis performed was a One-way ANOVA test followed by a post-hoc Tukey test. (C) Total flavonoid content (TFC) is expressed as milligrams of quercetin equivalents (QE) per gram of seeds. A Krustal-Wallis test by ranks was performed for multiple comparisons. Bars that do not share the same letters show statistically significant differences.