Fig. 6 – Antioxidant activity measured by (a) the FRAP assay (mol/g DW) and (b) the ORAC assay (mol Trolox equivalents/g
DW) for raw control (C) and cooked green asparagus spears. Data are pooled over two years.Values presented are (a) means and (b) means ± SE (n = 4 to 10). Means for individual treatments with the same letter are not significantly different
according to a Tukey’s test (α = 0.05). FRAP data were natural logarithm-transformed for ANOVA; means have been
backtransformed for clarity but letters indicating means separation pertain to transformed data. Antioxidant activity in
cooked spears, as a percentage of that in raw spears, is presented above each bar.