Figure 2.

Proportion of Met oxidized to methionine sulfoxide (MetO) in proteins of desiccated Norway maple and dehydrated sycamore seeds. A representative chromatogram indicating peaks recognized at 214 nm is shown. Standards of Met, MetO, tyrosine (Tyr) and tryptophan (Trp) were used for the calibration curves. The MetO ratio was calculated in relation to the total pool of Met. The data are the means of three independent replicates ± the STDs. The same letters indicate groups that are not significantly different according to Tukey’s test.