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The Effect of Bleaching Process on the Physical and Chemical Characteristics of Canola and Sunflower Seed Oils | ||
Journal of Food Biosciences and Technology | ||
مقاله 6، دوره 04، JFBT(Vol.4 - No.2)، مهر 2014، صفحه 41-44 اصل مقاله (280.19 K) | ||
نوع مقاله: Research Paper | ||
نویسندگان | ||
M. Haji Hoseini1؛ M. Ghavami 2؛ A. Heidary-Nasab3؛ M. Gharachorloo4 | ||
1M. Sc. of Food Science, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
2Professor of the College of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
3Assistant Professor, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
4Assistant Professor of the College of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
چکیده | ||
Bleaching process is an essential stage in the refining of vegetable oils and fats. In this process the colour and the primary and secondary oxidation products are removed by the treatment with the acid activated bleaching earth .The aim of this project is to understand the effect of bleaching on the physical characteristics and chemical constituents of neutralized canola and sunflower seed oils. Canola and sunflower seed oils were bleached at 100o C for 30 minutes. The results indicated that there were significant reductions in peroxides and red and yellow colours of the oils. The induction period representing the oil resistance to oxidation was improved however the acidity was increased that might be due to the nature of the acid activated earth that has caused slight hydrolysis. Slight changes in fatty acid composition was observed that was due to the oxidation of poly unsaturated fatty acids namely linoleic acid in both oils. Some reduction in the total non saponifiable matter was observed. This might be due to the oxidation of tocopherols and changes of the sterols structures due to their conversion to steroidal hydrocarbons. | ||
کلیدواژهها | ||
Bleaching؛ Canola Oil؛ Sunflower Seed Oil | ||
مراجع | ||
Firestone, D. (1990). Official Methods of Analysis of the Association of Official Analytical Chemists, 15 th edn., Arlington, USA.
Firestone, D. (1994). Official Methods and Recommended Practices of the American Oil Chemists’ Society, 4th edn., AOCS Press, Champaign, IL.
Gutfinger, T. & Letan, A. (1974). Quantitative changes in some unsaponifiable components of soyabean oil due to refining. Journal of the Science of Food and Agriculture, Vol. 25, 1143-1147.
Ghavami, M., Gharachorloo, M. and Mahasti, P. (2003). The effect of refining operations on the qualitative properties of soyabean oil. Journal of Agricultural Science, Vol. 9, No. 3.
Mirnezami, H. (2010). Oil refinery and margarine processing.
Naji, M. H., Ghavami, M. and Amin Lari, M. (2010). The effect of different bleaching earths on The quality edible oils. Journal of Food Technology and Nutrition, Vol. 7, No. 4. | ||
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