Fig. 4
From: Antioxidant and phenolic contents in potatoes (Solanum tuberosum L.) and micropropagated potatoes
Scatterplot of the interaction between the different methods to measure antioxidant activity. The correlation was determined by the Spearman coefficient of correlation method. Correlation coefficient between ABTS and either a DPPH (r = 0.58, p < 0.05) or b total phenolics (r = 0.27, p > 0.05). Correlation coefficient between β-carotene bleaching and either c ABTS (r = 0.05, p > 0.05) or d DPPH (r = 0.65, p < 0.05). Correlation coefficient between total phenolics and either e DPPH (r = 0.63, p < 0.05) or f β-carotene bleaching (r = 0.77, p < 0.05)