title: Comparison of Aroma-Active Volatiles in Oolong Tea Infusions Using GC-Olfactometry, GC-FPD, and GC-MS.
abstract: The aroma profile of oolong tea infusions (Dongdingwulong, DDWL; Tieguanyin, TGY; Dahongpao, DHP) were investigated in this study. Gas chromatography-olfactometry (GC-O) with the method of aroma intensity (AI) was employed to investigate the aroma-active compounds in tea infusions. The results presented forty-three, forty-five, and forty-eight aroma-active compounds in the TGY, DHP, and DDWL infusions, including six, seven, and five sulfur compounds, respectively. In addition, the concentration of volatile compounds in the tea infusions was further quantitated by solid phase microextraction-gas chromatography (SPME)-GC-MS and SPME-GC-flame photometric detection (FPD). Totally, seventy-six and thirteen volatile and sulfur compounds were detected in three types of tea infusions, respectively. Quantitative results showed that forty-seven aroma compounds were at concentrations higher than their corresponding odor thresholds. On the basis of the odor activity values (OAVs), 2-methylpropanal (OAV: 230-455), 3-methylbutanal (1-353), 2-methylbutanal (34-68), nerolidol (108-184), (E)-2-heptenal (148-294), hexanal (134-230), octanal (28-131), β-damascenone (29-59), indole (96-138), 6-methyl-5-hepten-2-one (34-67), (R)-(-)-linalool (63-87), and dimethyl sulfide (7-1320) presented relatively higher OAVs than those of other compounds, indicating the importance of these compounds in the overall aroma of tea infusions.
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: JianCai
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.|Department of Food, Nutrition, and Packaging Sciences, Clemson University , Clemson, South Carolina 29634, United States.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.affiliation: Shanghai Cosmax (China) Cosmetics Co., LTD , Shanghai, China.
authors.forename: LingYing
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: YunWei
authors.initials: Y
authors.lastname: Niu
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Yu
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: Chang
authors.initials: C
authors.lastname: Shu
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: HeXing
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: HongLin
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Perfume and Aroma Technology, Shanghai Institute of Technology , Shanghai, 201418, China.
authors.forename: ZuoBing
authors.initials: Z
authors.lastname: Xiao
mesh_terms: D028241:Camellia sinensis / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods*; D005421:Flavoring Agents / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D064367:Olfactometry / Q000379:methods*; D013662:Tea / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D005421:Flavoring Agents; D013662:Tea; D055549:Volatile Organic Compounds
keywords: GC−FPD; GC−O; aroma-active volatiles; oolong tea infusions; sulfur compound