Again a large amount of vanillic acid was further released by acid hydrolysis (176–257 mg/kg) in all three quinoas. p-Hydroxybenzoic acid (peak 3) instead of ferulic acid (peak 13) was the second dominant AHP followed by p-coumaric acid. Quercetin and kaempferol were the two flavonol aglycones identified in the AHP (Table 2). Eight phenolic compounds and three furfural derivatives have been found in treated samples after acid hydrolysis of these fractions.