title: Use of response surface methodology for the assessment of changes in the volatile composition of Moscato bianco (Vitis vinifera L.) grape berries during ripening.
abstract: The changes in the volatile composition of Moscato bianco grapes were evaluated during ripening. Grape berries were sampled for five weeks (16-20 °Brix) and sorted for each date in ten density classes (1.05-1.12g/cm(3)). The highest total concentration of free terpenes was found at 19.3 °Brix; however, total concentration of the bound fraction increased significantly throughout ripening. Response surface methodology was used to assess the simultaneous effect of sampling time and berry density on the volatile composition, which was satisfactorily fitted to regression models for some key terpene compounds. Total free and bound terpenes were more affected by grape density than by sampling date. The same behaviour was observed for free and bound linalool and bound nerol, whereas the stronger effect of sampling date was exhibited for bound t-rose oxide, c-rose oxide and geraniol. The results showed that the sampling strategy impacted strongly on the aroma quality of berries.
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy; Istituto di Enologia e Ingegneria Agro-Alimentare, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Torchio
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
authors.forename: Simone
authors.initials: S
authors.lastname: Giacosa
authors.affiliation: Misión Biológica de Galicia (CSIC), El Palacio-Salcedo, 36143 Pontevedra, Spain. Electronic address: mvilanova@mbg.csic.es.
authors.forename: Mar
authors.initials: M
authors.lastname: Vilanova
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
authors.forename: Susana
authors.initials: S
authors.lastname: Río Segade
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy; Consiglio Nazionale delle Ricerche, Istituto per la Protezione Sostenibile delle Piante, Unità Grugliasco, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Gerbi
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
authors.forename: Manuela
authors.initials: M
authors.lastname: Giordano
authors.affiliation: Università di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy; Consiglio Nazionale delle Ricerche, Istituto per la Protezione Sostenibile delle Piante, Unità Grugliasco, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Rolle
mesh_terms: D005638:Fruit / Q000737:chemistry* / Q000378:metabolism*; D011897:Random Allocation; D027843:Vitis / Q000737:chemistry* / Q000378:metabolism*; D014835:Volatilization; D014920:Wine / Q000032:analysis*
keywords: Berry density; Response surface methodology; Ripening; Terpenes; Wine grapes