Journal of Food and Nutrition Research
ISSN (Print): 2333-1119 ISSN (Online): 2333-1240 Website: http://www.sciepub.com/journal/jfnr Editor-in-chief: Prabhat Kumar Mandal
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Journal of Food and Nutrition Research. 2017, 5(9), 659-667
DOI: 10.12691/jfnr-5-9-5
Open AccessArticle

Effects of Microwave Roasting Process and Time on Chemical Composition and Oxidative Stability of Sunflower Oil

Khalid Mohammed1, Marwa Koko1, Mohammed Obadi1, Kekgabile Shathani Letsididi1, Peirang Cao1 and Y. Liu1,

1State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Lihu Avenue, Wuxi, P. R. China

Pub. Date: August 22, 2017

Cite this paper:
Khalid Mohammed, Marwa Koko, Mohammed Obadi, Kekgabile Shathani Letsididi, Peirang Cao and Y. Liu. Effects of Microwave Roasting Process and Time on Chemical Composition and Oxidative Stability of Sunflower Oil. Journal of Food and Nutrition Research. 2017; 5(9):659-667. doi: 10.12691/jfnr-5-9-5

Abstract

Purpose: In this study, sunflower seeds (Helianthus annuus) were treated with an industrial microwave oven under 700 W for 8, 12, 16 and 20 min and oil was extracted using mechanical press technique. A suitable roasting treatment (20 min) is advantageous to oil extraction yield and tocopherol contents. The extracted oil results showed no variations in the contents of fiber, ash, and protein that were attributable to the roasting. However, the color, FFA, p-anisidine, saponification and density values of oils were increased significantly as the roasting time increased. The iodine values of the oils were noticeably decreased. The oxidative stability revealed that, as the roasting time increased, the oxidative stability of sunflower oil decreased. Tocopherol contents were identified, namely, α- and β- tocopherols, whereas no δ-tocopherol was detected. The main tocopherol found in sunflower oil was α-tocopherol. The content of α-tocopherol in sunflower oil at 15 min of roasting gradually increased from 895.1 to 1108.83 mg/kg as roasting time increased. The fatty acid compositions of sunflower oil did not change with the roasting time. The major fatty acid was linoleic acid.

Keywords:
microwave roasting oxidative oil index sunflower seeds tocopherol

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References:

[1]  Yoshida, H., & Sachiko, T. (1997). Microwave roasting and positional distribution of fatty acids of phospholipids in soybeans (Glycine max L.). Journal of the American Oil Chemists’ Society, 74.8, 915-921.
 
[2]  Rosenberg, U., & Bogl, W. (1987). Microwave thawing, drying, and baking in the food industry. Food Technology.
 
[3]  Rosenberg, U., & Bogl, W. (1987). Microwave pasteurization, sterilization, blanching, and pest control in the food industry. Food Technology (USA).
 
[4]  George, M. (1997). Industrial microwave food processing. Food Review-Cape Town, 24, 11-15.
 
[5]  Yoshida, H., Hirakawa, Y., & Abe, S. (2001). Influence of microwave roasting on positional distribution of fatty acids of triacylglycerols and phospholipids in sunflower seeds (Helianthus annuus L.). European Journal of Lipid Science and Technology, 103, 201-207.
 
[6]  Yoshida, H., Abe, S., Hirakawa, Y., & Takagi, S. (2001). Roasting effects on fatty acid distributions of triacylglycerols and phospholipids in sesame (Sesamum indicum) seeds. Journal of the Science of Food and Agriculture, 81, 620-626.
 
[7]  Finot, P. A. (1995). Nutritional values and safety of microwave-heated food. Mitteilungen Aus Dem Gebiete der Lebensmi Eluntersuchung and Hygiene, 86, 128-128.
 
[8]  Mudgett, R. E. (1982). Electrical-properties of foods in microwave processing. Food technology, 36, 109-115.
 
[9]  Yoshida, H., Kondo, I., & Kajimoto, G. (1992). Effects of microwave energy on the relative stability of vitamin E in animal fats. Journal of the Science of Food and Agriculture, 58, 531-534.
 
[10]  Farag, R. S. (1994). Influence of microwave and conventional heating on the quality of lipids in model and food systems. Fett, 96, 215-222.
 
[11]  Yoshida, H., Hirooka, N., & Kajimoto, G. (1990). Microwave energy effects on quality of some seed oils. Journal of Food Science, 55, 1412-1416.
 
[12]  Yoshida, H., Shigezaki, J., Takagi, S., & Kajimoto, G. (1995). Variations in the composition of various acyl lipids, tocopherols and lignans in sesame seed oils roasted in a microwave oven. Journal of the Science of Food and Agriculture, 68, 407-415.
 
[13]  Takagi, S., Ienaga, H., Tsuchiya, C., & Yoshida, H. (1999). Microwave roasting effects on the composition of tocopherols and acyl lipids within each structural part and section of a soya bean. Journal of the Science of Food and Agriculture, 79, 1155-1162.
 
[14]  Ahmad, S., & Hassan, F. U. (2000). Oil yield and fatty acid composition of spring sunflower. Pak. J. Biol. Sci, 3, 2063-2064.
 
[15]  Yoshida, H., Matsuda, K., Hirakawa, Y., & Mizushina, Y. (2003). Roasting effects on the distribution of tocopherols and phospholipids within each structural part and section of soybeans. Journal of the American Oil Chemists' Society, 80, 665-674.
 
[16]  Bramley, P. M., Elmadfa, I., Kafatos, A.et al. (2000). Vitamin E. Journal of The Science of Food and Agriculture, 80, 913-938.
 
[17]  Shahidi, F. (2005). Bailey’s industrial oil and fat products, six volume set. In: Sunflower Oil (edited by F. Shahidi & M.A. Grompone). 6th edn, Pp. 655-730, Canada: Wiley online library.
 
[18]  ISO, Oilseeds Residues, Determination of Total Ash, ISO, Geneva. (1977). Standard No. 749
 
[19]  Farhoosh, R. (2007). The effect of operational parameters of the Rancimat method on the determination of the oxidative stability measures and shelf-life prediction of soybean oil. Journal of the American Oil Chemists’ Society, 84, 205-209.
 
[20]  Sánchez-Machado, D. I., Lopez-Hernandez, J., & Paseiro-Losada, P. (2002). High-performance liquid chromatographic determination of α-tocopherol in macroalgae. Journal of Chromatography A, 976, 277-284.
 
[21]  International Union of Pure and Applied Chemistry (IUPAC). (1987). Standard Methods for the Analysis of Oils and Fats and Derivatives,7th revised and enlarged edn., edited by C. Paquot and A. Hautfenne, Blackwell Scientific, London, Method 2. 301.
 
[22]  AOAC, Official Methods of the Association of Official Analytical Chemists. (1984). 14th edn, AOAC, Arlington, VA, Method 28. 110.
 
[23]  ISO, Animal Feeding Stuff. (1981). Determination of Nitrogen and Calculation of Crude Protein Contents, ISO, Geneva, Standard No. 5983.
 
[24]  ISO, Oilseeds Residues. (1977). Determination of Total Ash, ISO, Geneva, Standard No. 749.
 
[25]  Yoshida, H., Hirakawa, Y., & Abe, S. (2001). Roasting influences on molecular species of triacylglycerols in sunflower seeds (Helianthus annuus L.). Food research international, 34, 613-619.
 
[26]  Yoshida, H., & Kajimoto, G. (1994). Microwave heating affects composition and oxidative stability of sesame (Sesamum indicum) oil. Journal of Food Science, 59, 613-616.
 
[27]  Yoshida, H., Hirakawa, Y., Tomiyamaa, Y., & Mizushina, Y. (2003). Effects of microwave treatment on the oxidative stability of peanut (Arachis hypogaea) oils and the molecular species of their triacylglycerols. European Journal of Lipid Science and Technology, 105, 351-358.
 
[28]  Anwar, F., Anwer, T., & Mahmood, Z. (2005). Methodical characterization of rice (Oryza sativa) bran oil from Pakistan. Grasas y Aceites, 56, 125-134.
 
[29]  Oomah, B. D., & Mazza, G. (1992). Microwave oven drying for moisture determination in flax, canola and yellow mustard seeds. Food Science and Technology-Zurich-, 25, 523-523.
 
[30]  Lee, Y. C., Kim, I. H., Chang, J., Rhee, Y. K., Oh, H. I., & Park, H. K. (2004). Chemical composition and oxidative stability of safflower oil prepared with expeller from safflower seeds roasted at different temperatures. Journal of Food Science, 69(1).
 
[31]  Yen, G. C. (1990). Influence of seed roasting process on the changes in composition and quality of sesame (Sesame indicum) oil. Journal of the Science of Food and Agriculture, 50, 563-570.
 
[32]  Kim, I. H., Kim, C. J., You, J. M., Lee, K. W., Kim, C. T., Chung, S. H., & Tae, B. S. (2002). Effect of roasting temperature and time on the chemical composition of rice germ oil. Journal of the American Oil Chemists' Society, 79, 413-418.
 
[33]  Megahed, M. G. (2001). Microwave roasting of peanuts: Effects on oil characteristics and composition. Molecular Nutrition & Food Research, 45, 255-257.
 
[34]  Hafez, Y. S., Singh, G., Mclellan, M. E., & Monroe-Lord, L. (1983). Effects of microwave heating on nutritional quality of soybeans. Nutrition reports international, 28, 413-421.
 
[35]  Husain, S. Rafat, J. Terao, and S. Matsushita. (1986). Effect of browning reaction products of phospholipids on autoxidation of methyl linoleate. Journal of the American Oil Chemists' Society, 63, 1457-1460.
 
[36]  Hassanein, M. M., El-Shami, S. M., & El-Mallah, M. H. (2003). Changes occurring in vegetable oils composition due to microwave heating. Grasas y aceites, 54, 343-349.
 
[37]  Yoshida, H., Hirakawa, Y., Abe, S., & Mizushina, Y. (2002). The content of tocopherols and oxidative quality of oils prepared from sunflower (Helianthus annuus L.) seeds roasted in a microwave oven. European Journal of Lipid Science and Technology, 104, 116-122.
 
[38]  Cossignani, L., Simonetti, M. S., Neri, A., & Damiani, P. (1998). Changes in olive oil composition due to microwave heating. Journal of the American Oil Chemists' Society, 75, 931-937.
 
[39]  Fukuda, Y. (1990). Food chemical studies on the antioxidants in sesame seed. Nippon Shokuhin Kogyo Gakkaishi, 37, 484-492.
 
[40]  Anjum, F., Anwar, F., Jamil, A., & Iqbal, M. (2006). Microwave roasting effects on the physico-chemical composition and oxidative stability of sunflower seed oil. Journal of the American Oil Chemists' Society, 83, 777-784.
 
[41]  Jung, M. Y., Bock, J. Y., Baik, S. O., Lee, J. H., & Lee, T. K. (1999). Effects of roasting on pyrazine contents and oxidative stability of red pepper seed oil prior to its extraction. Journal of Agricultural and Food Chemistry, 47, 1700-1704.
 
[42]  Yoshida, H., Takagi, S., & Hirakawa, Y. (2000). Molecular species of triacylglycerols in the seed coats of soybeans (glycine max L.) following microwave treatment. Food Chemistry, 70, 63-69.
 
[43]  Farhoosh, R., Einafshar, S. & Sharayei, P. (2009). The effect of commercial refining steps on the rancidity measures of soybean and canola oils. Journal of Food Chemistry, 115, 933-938.
 
[44]  Gray, J. I. (1978). Measurement of lipid oxidation: a review. Journal of the American Oil Chemists’ Society, 55, 539-546.
 
[45]  Yoshida, H. (1994). Composition and quality characteristics of sesame seed (Sesamum indicum) oil roasted at different temperatures in an electric oven. Journal of the Science of Food and Agriculture, 65, 331-336.