title: S-alkenyl cysteine sulfoxide and its antioxidant properties from Allium cepa var. tropeana (red onion) seeds.
abstract: A new cysteine sulfoxide, (S(S)R(C))-S-(3-pentenyl)-L-cysteine sulfoxide (1), was identified from the seeds of Allium cepa var. tropeana, together with the known methiin, etiin, alliin, isoalliin, propiin, and butiin. The structure of compound 1 was established by analysis of its physical and spectroscopic data. The antioxidant activity of an extract containing cysteine sulfoxides and compound 1 was evaluated using the FRAP and DPPH tests.
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Universita di Napoli "Federico II", Via D. Montesano 49, 80131 Naples, Italy. irdini@unina.it
authors.forename: Irene
authors.initials: I
authors.lastname: Dini
authors.forename: Gian Carlo
authors.initials: GC
authors.lastname: Tenore
authors.forename: Antonio
authors.initials: A
authors.lastname: Dini
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001713:Biphenyl Compounds; D003545:Cysteine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D007558:Italy; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D019697:Onions / Q000737:chemistry*; D010851:Picrates / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry; D013454:Sulfoxides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D010851:Picrates; C534410:S-(3-pentenyl)-L-cysteine sulfoxide; D013454:Sulfoxides; C008389:methiin; C006453:alliin; C004931:1,1-diphenyl-2-picrylhydrazyl; D003545:Cysteine