Distribution of the two major flavonoids in rapeseed.

<p>(<b>A</b>) Structures of two major flavonoids found in rapeseed: <b>14</b>, kaempferol-3-<i>O</i>-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside-7-<i>O</i>-β-D-glucopyranoside; and <b>15</b>, kaempferol-3-<i>O</i>-(2-<i>O</i>-sinapoyl)-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside-7-<i>O</i>-β-D-glucopyranoside. (<b>B</b>) Concentrations of <b>14</b> and <b>15</b> in different rapeseed tissues and whole rapeseed. HR, hypocotyl and radicle; IC, inner cotyledon; OC, outer cotyledon; and SE, seed coat and endosperm. Each column shows the mean of four replicates with standard error, and *means not detectable.