title: Characterization of Citrus unshiu (C. unshiu Marcov. forma Miyagawa-wase) blossom aroma by solid-phase microextraction in conjunction with an electronic nose.
abstract: The volatile composition of the headspace from Citrus unshiu Marcov. forma Miyagawa-wase blossom was investigated. The volatile constituents were absorbed by a solid-phase microextraction (SPME) fiber and directly transferred to a GC-MS. Volatile compositional changes of C. unshiu blossom prepared via different drying methods (shade, microwave, and freeze-drying methods) were also determined. A total of 96 volatile constituents were confirmed in the headspace from these samples. Monoterpene hydrocarbons were prominent in the headspace volatiles of C. unshiu blossom: fresh, 84.1%; shade-dried, 60.0%; microwave-dried, 88.4%; and freeze-dried, 29.9%. p-Cymene (23.3%) was the most abundant component in the headspace of fresh C. unshiu blossom; gamma-terpinene was the most abundant in shade- and microwave-dried samples (26.8 and 31.2%, respectively) and beta-caryophyllene (10.5%) in freeze-dried sample. By using an electronic nose consisting of six metal oxide sensors, principal component analysis of the volatile compounds showed a clear aroma discrimination of the fresh and all dried blossom samples.
authors.affiliation: Department of Food and Nutrition, College of Natural Science, Duksung Women's University, Seoul 132-714, Korea. hschoi@center.duksung.ac.kr
authors.forename: Hyang-Sook
authors.initials: HS
authors.lastname: Choi
mesh_terms: D002849:Chromatography, Gas; D002957:Citrus / Q000737:chemistry*; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D004581:Electronics; D035264:Flowers / Q000737:chemistry*; D005612:Freeze Drying; D008401:Gas Chromatography-Mass Spectrometry; D008872:Microwaves; D039821:Monoterpenes; D009812:Odorants / Q000032:analysis*; D010087:Oxides / Q000032:analysis; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000032:analysis; D012903:Smell; D013729:Terpenes / Q000032:analysis; D014835:Volatilization
chemical_list: D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D039821:Monoterpenes; D010087:Oxides; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D013729:Terpenes; C016775:alpha-terpineol; C018669:gamma-terpinene; C024714:caryophyllene