title: Nutritional quality of fresh and heated Aleppo pine (Pinus halepensis Mill.) seed oil: trans-fatty acid isomers profiles and antioxidant properties.
abstract: Numerous studies have focused on trans fatty acids (TFA) technologically produced by partial hydrogenation of oils. However, TFA can also be present in fresh oils. For this reason, cis fatty acid (CFA), TFA and conjugated linoleic acid (CLA) of fresh and heated Aleppo pine seed oil (APSO) at frying temperature (180 °C) were evaluated and correlated with the antioxidant characteristics. Results showed that fresh APSO had a low oleic/linoleic ratio O/L (0.4). Total TFA in fresh APSO reached 1%. The predominant TFA was 18:2 n-6 (t9, t12) in both fresh and heated APSO. Individual TFA increased with significant differences (p < 0.05) with heating time. CLA occurred after 4 h and significantly increased (p < 0.05) accounting 10% of total TFA after 10 h. Total TFA are negatively correlated with α-tocopherol, γ-tocopherol (p < 0.05) and carotenoïds (p < 0.01) and positively correlated with remaining DPPH. Oil stability index (OSI) showed significant negative correlation with TFA (r = -0.925; p = 0.008). A principal component analysis (PCA) showed a clear discrimination between fresh and heated oils. Temperature, heating time, unsaturation degree and antioxidants are combined factors which significantly affect the isomerization rate and nutritional quality of APSO.
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Madiha
authors.initials: M
authors.lastname: Dhibi
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Manel
authors.initials: M
authors.lastname: Issaoui
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Faten
authors.initials: F
authors.lastname: Brahmi
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Beligh
authors.initials: B
authors.lastname: Mechri
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Amira
authors.initials: A
authors.lastname: Mnari
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Imed
authors.initials: I
authors.lastname: Cheraif
authors.affiliation: Biotechnology High Institute of Monastir, Monastir, Tunisia.
authors.forename: Fathia
authors.initials: F
authors.lastname: Skhiri
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Noureddine
authors.initials: N
authors.lastname: Gazzah
authors.affiliation: Laboratory of Biochemistry, UR "Human Nutrition and Metabolic Disorders" Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Hammami
keywords: Oxidative stability; Pinus halepensis; trans-fatty acids
references.citation: Food Chem. 2008 Oct 15;110(4):985-90
references.pmid: 26047290
references.citation: Prostaglandins Leukot Essent Fatty Acids. 2008 Sep-Nov;79(3-5):147-52
references.pmid: 18996687
references.citation: J Agric Food Chem. 2003 Nov 19;51(24):6961-9
references.pmid: 14611155
references.citation: Public Health Nutr. 2004 May;7(3):407-22
references.pmid: 15153272
references.citation: Asia Pac J Clin Nutr. 2008;17 Suppl 1:212-5
references.pmid: 18296340
references.citation: Am J Clin Nutr. 2004 Jun;79(6 Suppl):1132S-1136S
references.pmid: 15159246
references.citation: J Chromatogr A. 2000 Jun 9;881(1-2):251-4
references.pmid: 10905708
references.citation: J Chromatogr A. 2005 Dec 30;1100(2):185-92
references.pmid: 16236287
references.citation: Biotechnol Prog. 2005 May-Jun;21(3):998-1001
references.pmid: 15932286
references.citation: J Chromatogr A. 2004 Oct 29;1054(1-2):227-33
references.pmid: 15553148
references.citation: Proc Natl Acad Sci U S A. 1997 Apr 1;94(7):3217-22
references.pmid: 9096373