Glucosinolates in Lepidium bonariense L.

Abstract

The major glucosinolate in seeds of the South American crucifer Lepidium bonariense L. is shown to be the p-hydroxybenzylglucosinolate (glucosinalbate) ion (Ia), isolated as the tetramethylammonium salt and characterized as a potassium salt of the corresponding pentaacetate. The second, and minor, glucosinolate undergoes enzymatic hydrolysis with the production of p-methoxybenzyl isothiocyanate, typically formed from p-methoxybenzylglucosinolate (glucoaubrietin) (Ib). The seeds also contain sinapine, isolated as the thiocyanate. These results are at variance with a recent literature report on the glucosinolates in L. bonariense.