title: Chemical composition, aroma evaluation, and oxygen radical absorbance capacity of volatile oil extracted from Brassica rapa cv. "yukina" used in Japanese traditional food.
abstract: The chemical composition of the volatile oil extracted from the aerial parts of Brassica rapa cv. "yukina" was analyzed using GC-MS, GC-PFPD, and GC-O. A total of 50 compounds were identified. The most prominent constituents were (E)-1,5-heptadiene (40.27%), 3-methyl-3-butenenitrile (25.97%) and 3-phenylpropanenitrile (12.41%). With regard to aroma compounds, 12 compounds were identified by GC-O analysis. The main aroma-active compounds were dimethyl tetrasulfide (sulphury-cabbage, FD = 64), 3-phenylpropanenitrile (nutty, FD = 64), 3-methylindole (pungent, FD = 64), and methional (potato, FD = 32). The antioxidant activity of the aroma-active compounds of the oil was determined using an oxygen radical absorbance capacity (ORAC) assay using fluorescein as the fluorescent probe. The ORAC values were found to be 785 ± 67 trolox equivalents (μmol TE/g) for B. rapa cv. "yukina" oil. The results obtained showed that the volatile oil extracted from the aerial parts is a good dietary source of antioxidants.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Usami
authors.forename: Ryota
authors.initials: R
authors.lastname: Motooka
authors.forename: Ayumi
authors.initials: A
authors.lastname: Takagi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakahashi
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Okuno
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Miyazawa
mesh_terms: D000447:Aldehydes / Q000302:isolation & purification; D000975:Antioxidants; D029741:Brassica rapa / Q000737:chemistry*; D016166:Free Radical Scavengers; D008401:Gas Chromatography-Mass Spectrometry; D007564:Japan; D009570:Nitriles / Q000302:isolation & purification; D009812:Odorants / Q000032:analysis*; D009822:Oils, Volatile / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D035261:Plant Components, Aerial; D011407:Propane / Q000031:analogs & derivatives / Q000302:isolation & purification; D012862:Skatole / Q000302:isolation & purification; D013440:Sulfides / Q000302:isolation & purification
chemical_list: D000447:Aldehydes; D000975:Antioxidants; D016166:Free Radical Scavengers; D009570:Nitriles; D009822:Oils, Volatile; D013440:Sulfides; C532382:dimethyl tetrasulfide; C008390:methional; C488627:phenylmalononitrile; D012862:Skatole; D011407:Propane