Authors:Ana C. R. Melo, Edjane F. B. Silva, Larissa C. L. F. Araujo, Mirna F. Farias and Antonio S. Araujo
presents perpendicular straight channels (opening 6.7 × 6.7 Å) and tortuous channels (5.6 × 5.6 Å) [ 11 , 12 ]. In this context, the aim of this study was to investigate the thermogravimetric kinetics for the degradation of sunfloweroil under the
Authors:Anne G. D. Santos, Vinícius P. S. Caldeira, Mirna F. Farias, Antonio S. Araújo, Luiz D. Souza and Allan K. Barros
served as an option for rotation and crop succession in grain-producing regions [ 4 ]. Around of 48–52% of sunfloweroil can be extracted from sunflower seed. This oil presents high percentage of polyunsaturated fatty acids [ 5 ].
Carotenoids are important pigments found in foods and biological samples. Among carotenoids, β-carotene is the major carotenoid present in vegetable oils. It plays an important role in the thermal stability of the vegetable oil. We established a simple, precise, specific, sensitive, repeatable, and accurate HPTLC method for the analysis of β-carotene in fortified vegetable oils and assessment of its degradation. Analysis was performed on silica gel HPTLC plates with petroleum ether-hexane-acetone 2:3:1 (
) as mobile phase and densitometric detection. The
of β-carotene was 0.91 and regression analysis showed response was a linear function quantification of amount of β-carotene in the range 100–600 ng (
= 0.99991). The limits of detection and quantification were 0.11 and 0.37 ng, respectively. The thermal degradation (1–5 h at 100°C) of β-carotene in fortified sunflower oil was studied. It was observed that this HPTLC method could be used for efficient analysis and monitoring of the degradation of β-carotene in edible oils.
Authors:Szabolcs Harnos, György Onyestyák and Dénes Kalló
. Hydrodecarbonylation and step-by-step catalytic hydrogenation of the carboxylic acid were distinguished as the main reaction routes of hydrocarbon formation. Now the previous study is extended for using a real vegetable oil (sunfloweroil) over alumina supported
Authors:Iara M. S. Correia, Marcelo J. B. Souza, Antônio de S. Araújo and Elisa M. B. D. Sousa
-free kinetics [ 19 ].
Pyrolysis thermogravimetric kinetics of sunfloweroil was evaluated in a study carried out under helium atmosphere at different heating ratios [ 17 , 18 ]. Thermogravimetric curves (TG) and the kinetic method proposed in the
Authors:D. Rade, Ž. Mokrovčak, D. Štrucelj, D. Škevin and S. Neđeral
., Campbell, E. J., Bell, R. J., Pri Tchard, R. A. (1996): Sunfloweroil. - in: Hui, Y. H. (Ed.) Bailey's industrial oil and fat products . 5th Ed. Vol. 2. John Wiley & Sons, Inc. New York - etc., pp. 616-634.
Authors:M. L. A. Tavares, N. Queiroz, I. M. G. Santos, A. L. Souza, E. H. S. Cavalcanti, A. K. D. Barros, R. Rosenhaim, L. E. B. Soledade and A. G. Souza
sunfloweroil is constituted of 98 to 99% triacylglycerides, displaying an elevated content of unsaturated fatty acids (around 83%), being 72% of linoleic acid and a small amount of linolenic acid (≤0.4%).The presence of these fatty acids favors the