The bitter substance in rape seeds
Naturwiss 36(3): 88-89
When the mustard-oil and gluconapin contents of rape seeds are removed by distillation or eliminated by myrosinase, a bitter smell remains in the rape seeds for which an alkaline substance seems to be responsible. This bitter substance, probably sinapin, becomes yellow when alkaline substances are added. Its fluorescence is light blue in acid solns. and green in alkaline solns. The sinapin contents of 30 vars. fluctuated between 0.78 and 1.33% and were influenced by soil and weather.