Occurrence and taxonomic significance of cysteine sulphoxides in the genus Allium L. (Alliaceae)

Phytochemistry
Reinhard M Fritsch, Michael Keusgen

Abstract

Methiin was present in all investigated samples. In the genus Allium, methiin-dominated species (rarely used by man) were common, but the occurrence of the other cysteine sulphoxides was variable and was largely correlated with use as spices or vegetables. Two major chemical types (named according to the species where they occur) could be distinguished, and at least two more may be recognized. Isoalliin dominates in the widely used "onion-type", which includes chive (A. schoenoprasum) and top onion (A.xproliferum). Pearl onion and leek (A. ampeloprasum) have higher relative amounts of methiin and propiin, respectively. Alliin dominates in the widely used "garlic-type", which includes wild leek (A. obliquum) and sand leek (A. scorodoprasum). Alliin and isoalliin rarely co-dominate, being only found in the cultivated Chinese leek (A. tuberosum). A triple mix of almost equal amounts of methiin, alliin and isoalliin is present in ramson (A. ursinum). General trends in the three evolutionary lines of the genus Allium were apparent. In the first lineage, high amounts of methiin were more frequent, and propiin, although being a minor component in all three evolutionary lines, was present in the highest amounts. Most of the species in ...Continue Reading

Citations

Jul 5, 2011·Journal of Agricultural and Food Chemistry·Jan KustererMichael Keusgen
Aug 23, 2011·Journal of Agricultural and Food Chemistry·Christian StarkenmannMyriam Troccaz
Oct 2, 2012·Journal of Agricultural and Food Chemistry·Nathalie BernaertBart Van Droogenbroeck
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