Influence Of Composition On The Thermal Behavior Of Oils Extracted From The Seeds Of Some Romanian Grapes.

BACKGROUND The oils obtained from grape seeds are becoming a valuable way of exploiting the winery wastes and their properties are scrutinized for evaluating the potential usages. We examined the oils extracted with petroleum ether from grape seeds of four varieties of grapes (Cabernet Sauvignon, Feteasca Neagra, Merlot and Pinot Noir) from Romania looking at the influence of the fatty acid profile and of the antioxidants on their thermal behavior. RESULTS The fatty acid profiles of the oils was evaluated by 1 H-NMR spectroscopy, and the oil antioxidant capacity was determined by cupric ion reducing antioxidant capacity (CUPRAC) method. The main fatty acid component in all the oils is linoleic acid (over 70 %), which, due to its known health benefits, make the oils of commercial interest. The thermal stability of grape seed oils appears to be mainly influenced by the percentage of polyunsaturated fatty acids in their composition, less polyunsaturated fatty acids making the oils more stable. The antioxidant compounds affect only the initial stage of the decomposition by limiting the formation of hydroperoxides in the allylic positions of the fatty acid chain. CONCLUSION Compared to pure samples of glyceryl-unsaturated fatty acids (glyceryl-trioleate, glyceryl-trilinoleate), the grape seed oils exhibit higher thermal stability, due to the presence of antioxidant compounds and to a synergistic action of unsaturated and saturated fatty acids, smaller percentage of the polyunsaturated and higher percentage of the saturated fatty acids enhancing the stability. This article is protected by copyright. All rights reserved.

[1]  G. B. Alcantara,et al.  NMR-based and chemometric approaches applicable to adulteration studies for assessment of the botanical origin of edible oils , 2018, Journal of Food Science and Technology.

[2]  D. Copolovici,et al.  The influence of high-temperature heating on composition and thermo-oxidative stability of the oil extracted from Arabica coffee beans , 2018, PloS one.

[3]  D. Ramji,et al.  Nutraceuticals as therapeutic agents for atherosclerosis , 2018, Biochimica et biophysica acta. Molecular basis of disease.

[4]  A. Hanganu,et al.  Fatty Acid Profile of New Varieties of Grape Seed Oils Based on NMR Data and Their Authentication , 2018 .

[5]  Kátia Andressa Santos,et al.  Chemical composition, antioxidant activity and thermal analysis of oil extracted from favela (Cnidoscolus quercifolius) seeds , 2017 .

[6]  R. Upadhyay,et al.  Chemometric approach to develop frying stable sunflower oil blends stabilized with oleoresin rosemary and ascorbyl palmitate. , 2017, Food chemistry.

[7]  M. Stanescu,et al.  CLIMATE IMPACT ON FATTY ACID CONTENT OF GRAPE SEED OIL , 2017 .

[8]  Jaime Gallego,et al.  Relationship between oxidative stability and antioxidant activity of oil extracted from the peel of Mauritia flexuosa fruits , 2016, Journal of Thermal Analysis and Calorimetry.

[9]  M. Oroian,et al.  Antioxidants: Characterization, natural sources, extraction and analysis. , 2015, Food research international.

[10]  B. Gjorgjeska,et al.  Fatty acid composition of seed oil obtained from different canola varieties , 2015 .

[11]  Antonia,et al.  Composition and Thermal Behavior of Oils from Native Seeds and Fruits of Argentina and Uruguay , 2015 .

[12]  K. Papadopoulos,et al.  Evaluation of total reducing power of edible oils. , 2014, Talanta.

[13]  D. Bagchi,et al.  Free radical scavenging, antioxidant and cancer chemoprevention by grape seed proanthocyanidin: an overview. , 2014, Mutation research.

[14]  P. Kefalas,et al.  Content of Antioxidants, Antioxidant Capacity and Oxidative Stability of Grape Seed Oil Obtained by Ultra Sound Assisted Extraction , 2014 .

[15]  J. Yanik,et al.  THERMAL AND CATALYTIC DEGRADATION OF GRAPE SEEDS / POLYETHYLENE WASTE MIXTURE , 2014 .

[16]  Study of the thermal behavior of bicuíba oil (Virola bicuhyba) , 2014, Journal of Thermal Analysis and Calorimetry.

[17]  C. A. Ribeiro,et al.  Thermal behavior of coffee oil (Robusta and Arabica species) , 2014, Journal of Thermal Analysis and Calorimetry.

[18]  A. Sabir,et al.  The fatty acid and tocopherol constituents of the seed oil extracted from 21 grape varieties (Vitis spp.). , 2012, Journal of the science of food and agriculture.

[19]  D. Chambre,et al.  TG/DTG/DTA for the oxidation behavior characterization of vegetable and animal fats , 2012, Journal of Thermal Analysis and Calorimetry.

[20]  A. Nicolescu,et al.  Evaluation of the Computational Methods for Determining Vegetable Oils Composition using 1 H-NMR Spectroscopy , 2011 .

[21]  S. Arora,et al.  Effect of alpha-tocopherol (vitamin E) on the thermal degradation behavior of edible oils , 2010 .

[22]  Junsoo Lee,et al.  Effect of grape seed oil supplementation on plasma lipid profiles in rats , 2010 .

[23]  Qing-Xin Song,et al.  The Antioxidant Functions of Tocopherol and Tocotrienol Homologues in Oils, Fats, and Food Systems , 2010 .

[24]  R. Shewfelt,et al.  Physical and Sensory Attributes of a trans-Free Spread Formulated with a Blend Containing a Structured Lipid, Palm Mid-Fraction, and Cottonseed Oil , 2010 .

[25]  G. Alonso,et al.  Characterization of grape seed oil from different grape varieties (Vitis vinifera) , 2009 .

[26]  B. Matthäus.  Virgin grape seed oil: Is it really a nutritional highlight? , 2008 .

[27]  G. Buchbauer,et al.  Characterisation of various grape seed oils by volatile compounds, triacylglycerol composition, total phenols and antioxidant capacity. , 2008, Food chemistry.

[28]  S. Vecchio,et al.  Kinetic study of thermal breakdown of triglycerides contained in extra-virgin olive oil , 2008 .

[29]  A. Azzi.  Molecular mechanism of α-tocopherol action , 2007 .

[30]  P. I. B. M. Franco,et al.  Thermal stability studies of some cerrado plant oils , 2007 .

[31]  C. Crews,et al.  Quantitation of the main constituents of some authentic grape-seed oils of different origin. , 2006, Journal of agricultural and food chemistry.

[32]  R. Apak,et al.  Total antioxidant capacity assay of human serum using copper(II)-neocuproine as chromogenic oxidant: The CUPRAC method , 2005, Free radical research.

[33]  Dejian Huang,et al.  The chemistry behind antioxidant capacity assays. , 2005, Journal of agricultural and food chemistry.

[34]  J. Cristol,et al.  Extracts enriched in different polyphenolic families normalize increased cardiac NADPH oxidase expression while having differential effects on insulin resistance, hypertension, and cardiac hypertrophy in high-fructose-fed rats. , 2005, Journal of agricultural and food chemistry.

[35]  R. Apak,et al.  Novel total antioxidant capacity index for dietary polyphenols and vitamins C and E, using their cupric ion reducing capability in the presence of neocuproine: CUPRAC method. , 2004, Journal of agricultural and food chemistry.

[36]  Jo Dweck,et al.  Analysis of the thermal decomposition of commercial vegetable oils in air by simultaneous TG/DTA , 2004 .

[37]  A. G. Souza,et al.  Thermoanalytical, kinetic and rheological parameters of commercial edible vegetable oils , 2004 .

[38]  M. Conceição,et al.  A thermoanalytic and kinetic study of sunflower oil , 2004 .

[39]  J. Marcy,et al.  Effect of antioxidants on oxidative stability of edible fats and oils: thermogravimetric analysis. , 2004, Journal of agricultural and food chemistry.

[40]  J. K. Baker,et al.  One-Dimensional and Two-Dimensional 1H- and 13C-Nuclear Magnetic Resonance (NMR) Analysis of Vitamin E Raw Materials or Analytical Reference Standards , 1991, Pharmaceutical Research.

[41]  A. G. Souza,et al.  Thermal Stability and Kinetic Study on Thermal Decomposition of Commercial Edible Oils by Thermogravimetry , 2002 .

[42]  A. Masella,et al.  Effect of Biophenols on Olive Oil Stability Evaluated by Thermogravimetric Analysis , 1998 .

[43]  G. Mazza,et al.  Microwave heating of grapeseed : Effect on oil quality , 1998 .

[44]  E. Leoni,et al.  On the composition of Iranian olive oil , 1979 .