Fig. 2
From: An improved microscale method for extraction of phenolic acids from maize
Box plot comparison of free phenolic acids extracted from maize seeds by the conventional and improved methods. a Determination of p-coumaric acid. b Determination of trans-ferulic acid. c Standard deviation for p-coumaric acid. d Standard deviation for ferulic acid. Horizontal line represents the median. Vertical line represents the maximum and minimum value. Box covers the 75th and 25th percentiles. [+Results are expressed as µg per g dry weight (µg/g dw). Significant differences between the methods were established by ANOVA (α = 0.05), ns no significance, * p < 0.05; ** p < 0.001; *** p < 0.001]