title: Allium chemistry: identification of organosulfur compounds in ramp (Allium tricoccum) homogenates.
abstract: Supercritical fluid (SF) extracts of homogenized ramp (Allium tricoccum Ait.) were separated and characterized with liquid chromatography coupled with atmospheric pressure chemical ionization mass spectrometric identification. The profiles of SF extracts of aqueous homogenates of ramp bulbs from three different seasons and growing regions revealed that the thiosulfinates were major components. In addition, some of the cepaenes (alpha-sulfinyldisulfides) found in extracts of onion juice, as well as allyl containing cepaenes (2-propenyl l-(2-propenylsulfinyl)propyl disulfide), are present in the ramp extracts. The amount of allicin in ramp bulb homogenates ranged from approximately 10% to 50% of that found in extracts of aqueous garlic homogenates. The greater amount of the methyl 1-propenyl thiosulfinates in the ramp extracts relative to that found in the garlic extracts correlates with the flavor characteristics of ramp bulbs.
authors.affiliation: Center for Food Safety and Applied Nutrition, Food and Drug Administration, Washington, DC 20204, USA.
authors.forename: E M
authors.initials: EM
authors.lastname: Calvey
authors.forename: K D
authors.initials: KD
authors.lastname: White
authors.forename: J E
authors.initials: JE
authors.lastname: Matusik
authors.forename: D
authors.initials: D
authors.lastname: Sha
authors.forename: E
authors.initials: E
authors.lastname: Block
mesh_terms: D000490:Allium / Q000737:chemistry*; D002853:Chromatography, Liquid; D004220:Disulfides / Q000032:analysis* / Q000737:chemistry; D013058:Mass Spectrometry; D010936:Plant Extracts / Q000032:analysis* / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000032:analysis* / Q000737:chemistry; D013441:Sulfinic Acids / Q000032:analysis* / Q000737:chemistry
chemical_list: D004220:Disulfides; D010936:Plant Extracts; D013438:Sulfhydryl Compounds; D013441:Sulfinic Acids