Fig. 3. Flavonoid concentration (A) and phenol concentration (B) of apple juices
supplemented with different concentrations of onion solutions and heating. Flavonoid concentrations are indicated using representative data; (n = 3). Values expressed as means ± standard deviation; (n = 9). ***, p < 0.001 versus unheated onion concentration at 0%. ###, p < 0.001 versus heated onion concentration at 0%. $, p < 0.05; $$$, p < 0.001 versus unheated group.