publication . Article . 2015

Temperature dependence of refractive index and of electrical impedance of grape seed (Vitis vinifera, Vitis labrusca) oils extracted by Soxhlet and mechanical pressing

Vieira, D. S.; Menezes, M.; Gonçalves, G.; Mukai, H.; Lenzi, E. K.; Pereira, N. C.; Fernandes, P. R.G.;
Open Access
  • Published: 01 Sep 2015 Journal: Grasas y Aceites, volume 66, page e083 (issn: 0017-3495, eissn: 1988-4214, Copyright policy)
  • Publisher: Departmento de Publicaciones del CSIC
Abstract
In this report, the temperature dependence of the refractive index and electric impedance of vegetable oil grape seeds extracted from <em>Vitis vinifera</em> (v. Cabernet) and <em>Vitis labrusca</em> (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 b...
Subjects
free text keywords: Food Science, Organic Chemistry, Refractometry, Electrical impedance, Permittivity, Refractive index, Pressing, Grape seed oil, food.ingredient, food, Analytical chemistry, Vegetable oil, Birefringence, Chemistry, Complex Fluids, Electric Circuits, Grape Seed Oils, Aceites de semillas de uva, Circuitos eléctricos, Fluidos complejos, Impedancia eléctrica, Índice de refracción, Nutrition. Foods and food supply, TX341-641
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publication . Article . 2015

Temperature dependence of refractive index and of electrical impedance of grape seed (Vitis vinifera, Vitis labrusca) oils extracted by Soxhlet and mechanical pressing

Vieira, D. S.; Menezes, M.; Gonçalves, G.; Mukai, H.; Lenzi, E. K.; Pereira, N. C.; Fernandes, P. R.G.;