Document Detail

Isolation and identification of a new cysteine sulfoxide and volatile sulfur compounds from Allium subgenus Melanocrommyum.
MedLine Citation:
PMID:  19919098     Owner:  NLM     Status:  MEDLINE    
A new cysteine sulfoxide containing a pyridyl residue was identified in bulbs of Allium L. species belonging to the subgenus Melanocrommyum section Megaloprason. One of these species, Allium stipitatum, is widely used as a crop plant and in folk medicine in Central Asia. The new cysteine sulfoxide was identified as L-(+)-S-(2-pyridyl)-cysteine sulfoxide. Aside from this cysteine sulfoxide, several pyridyl compounds could be identified, which were formed out of cysteine sulfoxides by the action of alliinase. Found cysteine sulfoxides and their metabolites are chemically unstable; thus, the analysis is rather difficult. By combining high-performance liquid chromatography (HPLC), HPLC tandem mass spectrometry, NMR, IR, and photometric methods, full structure elucidation of the cysteine sulfoxide was possible. Alliinase reaction products were mainly determined by various MS techniques. The achieved results give new insights in the chemistry of Allium crop plants and are probably useful for chemotaxonomical classification of the subgenus Melanocrommyum.
Jan Kusterer; Anja Vogt; Michael Keusgen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  58     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-06     Completed Date:  2010-03-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  520-6     Citation Subset:  IM    
Institut for Pharmazeutische Chemie der Philipps-Universit?t Marburg, Marbacher Weg 6-10, D-35037 Marburg, Germany.
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MeSH Terms
Allium / chemistry*
Plant Extracts / chemistry,  isolation & purification*
Plant Roots / chemistry
Sulfoxides / chemistry,  isolation & purification*
Sulfur Compounds / chemistry,  isolation & purification*
Reg. No./Substance:
0/Plant Extracts; 0/Sulfoxides; 0/Sulfur Compounds

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