Temperature dependence of refractive index and of electrical impedance of grape seed (Vitis vinifera, Vitis labrusca) oils extracted by Soxhlet and mechanical pressing
DOI:
https://doi.org/10.3989/gya.0954142Keywords:
Complex Fluids, Electric Circuits, Electrical Impedance, Grape Seed Oils, Refractive IndexAbstract
In this report, the temperature dependence of the refractive index and electric impedance of vegetable oil grape seeds extracted from Vitis vinifera (v. Cabernet) and Vitis labrusca (v. Bordo) are investigated by means of experimental techniques. The seeds were collected from wineries located in two cities in the south of Brazil. In both extraction methods, the seeds were dried at 40.0 °C and at 80.0 °C, respectively, before the oil extraction. From optical microscopy and refractometry results, one can see that the grape seed oil extracted by mechanical pressing shows a linear dependence between the refractive index and temperature and has no birefringent residues. From the fitting of the EIS (Electrical Impedance Spectroscopy) data, an equivalent electric circuit composed of a parallel RC in series with a resistor is proposed. The circuit model is in good agreement with the experimental data and provides the electrical permittivity of the vegetable oils investigated.
Downloads
References
Ahmadi SM, Siahsar BA. 2011. Analogy of physicochemical attributes of two grape seeds cultivars. Food Technol. 38, 291–301. http://dx.doi.org/10.4067/s0718-16202011000200014
Aouada FA, de Moura MR, Fernandes PRG, Rubira AF, Muniz EC. 2005. Optical and morphological characterization of polyacrylamide hydrogel and liquid crystal systems. Eur. Polym. J. 41, 2134–2141. http://dx.doi.org/10.1016/j.eurpolymj.2005.03.020
Baydar NG, Özkan G, Çetin ES. 2007. Characterization of grape seed and pomace oil extracts. Grasas Aceites 58, 29–33.
Born M, Wolf E. 1980. Principles of Optics. Sixth (Corrected) Edition, Cambridge University Press, Cambridge, UK.
Bustamante MA, Moral R, Paredes C, Pérez-Espinosa A, Moreno-Caselles J, Pérez-Murcia MD. 2008. Agrochemical characterisation of the solid by-products and residues from the winery and distillery industry. Waste Manage 28, 372–380. http://dx.doi.org/10.1016/j.wasman.2007.01.013 PMid:17433659 Cao X, Ito Y. 2003. Supercritical fluid extraction of grape seed oil and subsequent separation of free fatty acids by highspeed counter-current chromatography. J. Chromatogr. A 1021, 117–124. http://dx.doi.org/10.1016/j.chroma.2003.09.001 PMid:14735980
Devesa-Rey R, Vecino X, Varela-Alende JL, Barral MT, Cruz JM, Moldes AB. 2011. Valorization of winery waste vs. the costs of not recycling. Waste Manage 31, 2327–2335. http://dx.doi.org/10.1016/j.wasman.2011.06.001 PMid:21752623
Feringa HHH, Laskey DA, Dickson JE, Coleman CI. 2011. The effect of grape seed extract on cardiovascular risk markers: A meta-analysis of randomized controlled trials. Am. Diet. Assoc. 111, 1173–1181. http://dx.doi.org/10.1016/j.jada.2011.05.015 PMid:21802563
Freitas LS. 2007. Desenvolvimento de Procedimentos de Extração do Óleo de Semente de Uva e Caracterização Química dos Compostos Extraídos, PhD Thesis, Instituto de Química, Universidade Federal do Rio Grande do Sul, Brazil.
Hongratanaworakit T. 2011. Aroma-therapeutic effect of massage blended essential oils on humans. Natural Product Communications 6, 1199–1204. PMid:21922934
Jäger W, Buchbauer G, Jirovetz L, Fritzer M. 1992. Percutaneous absortion of lavander oil from a massage oil. J. Soc. Cosmect. Chem. 43, 49–54.
Jayaprakasha GK, Singh RP, Sakaruah KK. 2001. Antioxidant activity of grape seed (Vitis vinifera) extracts on peroxidation models in vitro. Food Chem. 73, 285–290. http://dx.doi.org/10.1016/S0308-8146(00)00298-3
Kimura NM, Santoro PA, Fernandes PRG, Palangana AJ. 2004. Reentrant isotropic-discoticnematiclyotropic phase transition: a refractive index study. Liq. Cryst. 31, 1–4. http://dx.doi.org/10.1080/02678290310001655221
Lavabre M. 1990. Aromatherapy Workbook, Inner Traditions International, Rochester, Vermont, USA.
Lenzi EK, Fernandes PRG, Petrucci T, Mukai H, Ribeiro HV. 2011. Anomalous-diffusion approach applied to the electrical response of water. Physic. Rev. E 84, 041128. http://dx.doi.org/10.1103/PhysRevE.84.041128 PMid:22181108
Mukai H, Fernandes PRG, de Oliveira BF, Dias GS. 2007. Defect-antidefect correlations in a lyotropic liquid crystal from a cosmological point of view. Physic. Rev. E 75, 061704. http://dx.doi.org/10.1103/PhysRevE.75.061704 PMid:17677280
Nassiri-Asl M, Hosseinzadeh H. 2009. Review of the pharmacological effects of Vitis vinifera (Grape) and its bioactive compounds. Phytother. Res. 23, 1197–1204. http://dx.doi.org/10.1002/ptr.2761 PMid:19140172
Pardo JE, Fernández E, Rubio M, Alvarruiz A, Alonso GL. 2009. Characterization of grape seed oil from different grape varieties (Vitis vinifera). Eur. J. Lipid Sci. Technol. 111, 188–193. http://dx.doi.org/10.1002/ejlt.200800052
Vigna GB, Constantini F, Aldini G, Carini M, Catapano A, Schena F, Tangerini A, Zanca R, Bambardelli E, Marazzoni P, Mezzetti A, Fellin R, Facino RM. 2003. Effect of a standardized grape seed extract on low-density lipoprotein susceptibility to oxidation in heavy smokers. Metabolism 52, 1250–1257. http://dx.doi.org/10.1016/S0026-0495(03)00192-6
Visentainer JV, Franco MRB. 2006. Ácidos Graxos em Óleos e Gorduras: Identificação e Quantificação, Ed. Varela, São Paulo, Brazil.
Vislocky LM, Fernandez ML. 2010. Biomedical effects of grape products. Nutrition Review 68, 656–670. http://dx.doi.org/10.1111/j.1753-4887.2010.00335.x PMid:20961296
Published
How to Cite
Issue
Section
License
Copyright (c) 2015 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the print and online versions of this journal are the property of the Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.
All contents of this electronic edition, except where otherwise noted, are distributed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. You may read here the basic information and the legal text of the licence. The indication of the CC BY 4.0 licence must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the final version of the work produced by the publisher, is not allowed.