Table 2. Sinapine contents (mg/g dry wt.) in not-purified, purified surface-active substances and residues

Sample	Purified surface-active substances (mg/g)	Surface-active extracts (not-purified) (mg/g)	Residues (mg/g)
Sinapine	N.D.1)	505.75±0.052)a	480.88±0.07b

N.D. : Not detected.
Values are mean±standard deviation (n = 3).
Means with different letters in the same column are significantly different according to Duncan’s multiple range test (p < 0.05).