title: Changes in biochemical compounds in flesh and peel from Prunus persica fruits grown in Tunisia during two maturation stages.
abstract: Plants can synthesize tens to hundreds of thousands of primary and secondary metabolites with diverse biological properties and functions. Fatty acids (FA), phenolic compounds (PC) and volatile compounds (VC) of flesh and peel from three Prunus persica cultivars were evaluated at the Regional Centre of Agricultural Research--Experimental Farm (Sidi Bouzid, Tunisia) during two maturation stages. Palmitic, oleic and linoleic acids are the most abundant FA in Prunus persica cultivars. A genetic effect on FA composition was observed throughout the two sampling periods. Peel was rich in oleic acid with the highest content (31.3% on total FA) in 'O'Henry' cultivar at the commercial ripening date; flesh was rich in linoleic acid with the highest content (44.7% on total FA) in 'Sweet Cap' cultivar at the full ripening date. The monounsaturated/polyunsaturated fatty acids ratios were higher in the commercial ripe than in the full ripe fruits. The analysis of the composition of the VC led to the characterization of 98 different compounds, showing a very high variability among the cultivars. The full ripe fruit (peel and flesh) exhibited the highest total number of terpenoids. Commercial ripe peels were richest in the percentage of hydrocarbons. Comparing cultivars, 'Sweet Cap' cultivar showed the lowest contents of alcohols in peel and flesh of full ripe fruit but highest in peel of commercial ripe fruit, and lowest content of aldehydes in peel and flesh of commercial ripe fruit but highest in peel of ripe ones and the highest ones of lactones. Among PC, the highest contents were observed for o-diphenols and the values showed varietal influence. Total phenols contents decreased during ripening process (p < 0.05) in both peel and flesh tissues, except found for 'Sweet Cap' cultivar. In conclusion, to achieve better FA composition and greater VC and PC production of the peach fruit, P. persica cultivars should be harvested at the commercial ripening date.
authors.affiliation: Laboratory of Bioressources, Integrative Biology and Valorisation, Higher Institute of Biotechnology of Monastir, University of Monastir, Av. Tahar Hadded, BP 74, 5000 Monastir, Tunisia; Dentistry Faculty, University of Monastir, Avicenne Street, 5019 Monastir, Tunisia. Electronic address: samia_1509@yahoo.fr.
authors.forename: Samia
authors.initials: S
authors.lastname: Dabbou
authors.affiliation: Department of Agricultural, Forest, and Food Sciences (DiSAFA), University of Torino, Largo Paolo Braccini 2, 10095 Grugliasco, Italy.
authors.forename: Carola
authors.initials: C
authors.lastname: Lussiana
authors.affiliation: Regional Centre of Agricultural Research (CRRA) PB 357, Sidi Bouzid 9100, Tunisia.
authors.forename: Samira
authors.initials: S
authors.lastname: Maatallah
authors.affiliation: Department of Agricultural, Forest, and Food Sciences (DiSAFA), University of Torino, Largo Paolo Braccini 2, 10095 Grugliasco, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Gasco
authors.affiliation: Regional Centre of Agricultural Research (CRRA) PB 357, Sidi Bouzid 9100, Tunisia.
authors.forename: Hichem
authors.initials: H
authors.lastname: Hajlaoui
authors.affiliation: Dipartimento di Farmacia, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy; Centro Interdipartimentale di Ricerca "Nutraceutica e Alimentazione per la Salute", University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Flamini
mesh_terms: D005231:Fatty Acids, Unsaturated / Q000378:metabolism*; D005638:Fruit / Q000378:metabolism*; D000068239:Prunus persica / Q000254:growth & development*; D013729:Terpenes / Q000378:metabolism*; D014416:Tunisia
chemical_list: D005231:Fatty Acids, Unsaturated; D013729:Terpenes
keywords: Maturation; Phenols; Prunus persica; Volatile compounds; fatty acids; flesh; peel