title: Effect of storage under extremely low oxygen on the volatile composition of 'Royal Gala' apples.
abstract: The aim of this work was to assess the profile of volatile compounds in 'Royal Gala' apples stored under controlled atmosphere (CA), with O(2) levels ranging from 1.0kPa to as low as 0.5kPa during 8months (0.5°C), followed by 7days of shelf-life at 20°C. Volatile compounds were collected via solid-phase microextraction (HS-SPME) and analysed by gas chromatography. Straight and branched-chain esters exhibited a distinct pattern. The emission of straight-chain esters decreased under extremely low O(2) (0.5kPa), while branched-chain esters were not significantly affected in such condition. 2-Methyl-butyl acetate, a significant contributor to the 'Royal Gala' aroma, was higher in intermediate O(2) concentration, suggesting that lowering the O(2) levels down to 0.7kPa does not negatively affect the volatile composition of 'Royal Gala' apples, as compared to the standard CA (1.0kPa O(2)). The remaining volatile compounds were not strongly affected by storing fruits under extremely low O(2).
authors.affiliation: Department of Plant Science, Postharvest Research Center, Federal University of Santa Maria, Roraima Avenue 1000, Camobi, Santa Maria 97105-900, RS, Brazil. Electronic address: vanderleiboth@yahoo.com.br.
authors.forename: Vanderlei
authors.initials: V
authors.lastname: Both
authors.affiliation: Department of Plant Science, Postharvest Research Center, Federal University of Santa Maria, Roraima Avenue 1000, Camobi, Santa Maria 97105-900, RS, Brazil.
authors.forename: Auri
authors.initials: A
authors.lastname: Brackmann
authors.affiliation: Department of Plant Science, Postharvest Research Center, Federal University of Santa Maria, Roraima Avenue 1000, Camobi, Santa Maria 97105-900, RS, Brazil.
authors.forename: Fabio Rodrigo
authors.initials: FR
authors.lastname: Thewes
authors.affiliation: Department of Food Science and Technology, Federal University of Santa Maria, Roraima Avenue 1000, Camobi, Santa Maria 97105-900, RS, Brazil.
authors.forename: Daniele de Freitas
authors.initials: Dde F
authors.lastname: Ferreira
authors.affiliation: Department of Food Science and Technology, Federal University of Santa Maria, Roraima Avenue 1000, Camobi, Santa Maria 97105-900, RS, Brazil.
authors.forename: Roger
authors.initials: R
authors.lastname: Wagner
mesh_terms: D004952:Esters / Q000032:analysis; D061353:Food Storage / Q000295:instrumentation / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D027845:Malus / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D011312:Pressure; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D004952:Esters; D055549:Volatile Organic Compounds; D010100:Oxygen
keywords: Aroma; Controlled atmosphere; Ethylene; Malus domestica; Volatile compounds