title: Phytosterols, unsaturated fatty acid composition and accumulation in the almond kernel during harvesting period: importance for development regulation.
abstract: The evolution of the composition of sterols and squalene during the maturation of the fruit of three cultivars (Achaak, Perlees and Mazetto) almond (Prunus amygdalus Batsh) was investigated. At the same time the evolution of oleic, linoleic and linolenic fatty acids was also studied. The qualitative and quantitative analyses were made by GC-MS and GC-FID. The present study is based on three axes: The first one is the structural and molecular identification of compounds sterolic and squalene, which are based on the principal of cleavage and the fragmentation characteristic of each peak provided by mass spectrometry. The second axis is interested in the physiological phenomenon of phytosterols accumulation: biosynthesis, evolution, and their relation with squalene as well as their interconversion. The third axis is an emergence of a relationship, which seems to exist, between the biosynthetic compounds of the glyceridic fraction of almond oil (mainly fatty acids) and those of the unsaponifiable fraction (particularly sterols). This relation may be established by 24-methylene cholesterol.
authors.affiliation: Laboratoire de biochimie des lipides, faculté des sciences de Tunis, campus universitaire, 2094 Elmanar II, Tunisia. ammarw_tn@yahoo.fr
authors.forename: Ammar
authors.initials: A
authors.lastname: Cherif
authors.forename: Khaled
authors.initials: K
authors.lastname: Belkacemi
authors.forename: Habib
authors.initials: H
authors.lastname: Kallel
authors.forename: Paul
authors.initials: P
authors.lastname: Angers
authors.forename: Joseph
authors.initials: J
authors.lastname: Arul
authors.forename: Sadok
authors.initials: S
authors.lastname: Boukhchina
mesh_terms: D002784:Cholesterol / Q000031:analogs & derivatives / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D007202:Indicators and Reagents; D010840:Phytosterols / Q000032:analysis*; D010938:Plant Oils; D027861:Prunus / Q000254:growth & development* / Q000378:metabolism*; D012639:Seeds / Q000378:metabolism; D013185:Squalene / Q000378:metabolism; D014297:Trimethylsilyl Compounds / Q000737:chemistry; D017962:alpha-Linolenic Acid / Q000378:metabolism
chemical_list: D005231:Fatty Acids, Unsaturated; D007202:Indicators and Reagents; D010840:Phytosterols; D010938:Plant Oils; D014297:Trimethylsilyl Compounds; D017962:alpha-Linolenic Acid; C068582:almond oil; D013185:Squalene; D002784:Cholesterol; C002537:24-methylenecholesterol