Sains Malaysiana 43(8)(2014): 1189–1195

 

Effect of Microwave Heating on Oxidative Degradation of Sunflower Oil

in the Presence of Palm Olein

(Kesan Pemanasan Gelombang Mikro Terhadap Pemerosotan Oksidatif Campuran

Minyak Bunga Matahari dalam Olein Sawit)

 

 

M. ABBAS ALI1,2*, Z. BAMALLI NOURUDDEEN1, IDA I. MUHAMAD1, R. ABD LATIP3

& N. HIDAYU OTHMAN3

 

1Department of Bioprocess Engineering, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim, Malaysia

 

2Department of Chemistry, Rajshahi University of Engineering & Technology

Rajshahi-6204, Bangladesh

 

3Sime Darby Research Sdn. Bhd., 42700 Banting, Selangor Darul Ehsan, Malaysia

 

 

Diserahkan: 1 November 2012/Diterima: 9 Disember 2013

 

ABSTRACT

The aim of this study was to evaluate on how heat treatments by microwave oven may affect the oxidative degradation of sunflower oil (SFO) and its blend with palm olein (PO). The blend was prepared in the volume ratio of 40:60 (PO: SFO, PSF). The samples were exposed to microwave heating at medium power setting, for different periods. In this study, refractive index, free fatty acid content, peroxide value, p-anisidine value, total oxidation (TOTOX), specific extinction, viscosity, polymer content, polar compounds and food oil sensor value of the oils all increased, whereas iodine value and C18:2/C16:0 ratio decreased as microwave heating progressed. Microwave heating temperature increased with increasing heating time and longer heating times resulted in a greater degree of oil deterioration. The percentage of linoleic acid tended to decrease, whereas the percentage of palmitic acid increased. The effect of adding PO to SFO on the formation of free fatty acids and conjugated dienes during microwave treatment was not significant (p< 0.05). No significant differences in food oil sensor value was observed between SFO and PSF. Based on the most oxidative stability criteria, it can be concluded that the microwave heating caused the formation of comparatively lower amounts of oxidation products in PSF compared to SFO, indicating a lower extent of oxidative degradation of PSF.

 

Keywords: Fatty acids; microwave heating; oxidative stability; polar compounds; sunflower oil

 

ABSTRAK

Tujuan kajian ini dijalankan adalah untuk menilai bagaimana olahan haba oleh ketuhar gelombang mikro boleh mempengaruhi kemerosotan oksidatif minyak bunga matahari (SFO) dan campuran dengan olein sawit (PO). Campuran telah disediakan dalam nisbah isi padu 40:60 (PO: SFO, PSF). Sampel didedahkan kepada pemanasan gelombang mikro pada tetapan kuasa sederhana untuk tempoh yang berbeza. Dalam kajian ini, indeks biasan, kandungan asid lemak bebas, nilai peroksida, nilai p-anisidine, pengoksidaan total (TOTOX), kepupusan spesifik, kelikatan, kandungan polimer, sebatian berkutub dan nilai sensor minyak makan bagi semua sampel minyak meningkat, manakala nilai iodin dan nisbah C18:2/C16:0 menurun semasa pemanasan gelombang mikro tersebut berlaku. Suhu pemanasan gelombang mikro meningkat dengan pertambahan masa pemanasan dan masa pemanasan yang lebih panjang mengakibatkan tahap kemerosotan minyak yang lebih besar. Peratusan asid linoleik cenderung berkurangan, manakala peratusan asid palmitik meningkat. Kesan menambah PO ke dalam SFO terhadap pembentukan asid lemak bebas dan diene berkonjugat hasil olahan gelombang mikro didapati tidak signifikan (p<0.05). Tiada perbezaan yang ketara dalam nilai sensor minyak makan yang diperhatikan antara SFO dan PSF. Berdasarkan kriteria kestabilan oksidatif paling utama, dapat disimpulkan bahawa pemanasan gelombang mikro telah menyebabkan pembentukan jumlah produk pengoksidaan yang agak rendah dalam PSF berbanding SFO dan ini menunjukkan tahap kemerosotan oksidatif PSF yang lebih rendah.

 

Kata kunci: Asid lemak; kestabilan oksidatif; minyak bunga matahari; pemanasan mikro gelombang; sebatian berkutub

RUJUKAN

 

Al-Kahtani, H. 1991. Survey of quality of used frying oils from restaurants. Journal of American Oil Chemists Society 68: 857-862.

AOCS. 1987. Official Methods and Recommended Practices of the American Oil Chemists’ Society. 4th ed. Champaign: AOCS press.

Bendini, A., Valli, E., Cerretani, L., Chiavaro, E. & Lercker, G. 2009. Study on the effects of heating of virgin olive oil blended with mildly deodorized olive oil: Focus on the hydrolytic and oxidative state. Journal of Agricultural and Food Chemistry 57: 10055-10062.

De Marco, E., Savarese, M., Parisini, C., Battimo, I., Falco, S. & Sacchi, R. 2007. Frying performance of a sunflower/palm oil blend in comparison with pure palm oil. European Journal of Lipid Science and Technology 109: 237-246.

Dobarganes, M.C., Velasco, J. & Dieffenbacher, A. 2000. Determination of polar compounds, polymerized and oxidized triacylglycerols and diacylglycerols in oils and fats. Pure and Applied Chemistry 72: 1563-1575.

Emma, C., Maria, T.R., Elena, V. & Nicoletta, P. 2010. Microwave heating of different vegetable oils: Relation between chemical and thermal parameters. LWT - Food Science and Technology 43: 1104-1112.

Hassanein, M.M., El-Shami, S.M. & El-Mallah, M.H. 2003. Changes occurring in vegetable oils composition due to microwave heating. Grasas Y Aceites54: 343-349.

Huang, A.S., Hsieh, O.A.L., Huang, C.L. & Chang, S.S. 1981. A comparison of the stability of sunflower oil and corn oil. Journal of American Oil Chemists Society 58: 997-1001.

Jowitt, R. 1983. Physical Properties of Foods. London: Applied Science. pp. 249-269.

Labuza, T.P. 1971. Kinetics of lipid oxidation in foods. CRC Critical Reviews in Food Technology 2: 355-404.

Lukešová, D., Dostálová, J.E., El-Moneim, M. & Svárovská, M. 2009. Oxidation changes of vegetable oils during microwave heating. Czech Journal of Food Science 27: S178-S181.

Mohsenin, N.N. 1984. Electromagnetic Radiation Properties of Foods and Agricultural Products. New York: Gordon and Breach. pp. 41-52.

Nor Aini, I., Yusof, B., Hanirah, H. & Rosilah, B. 1993. Effect of some additives on resistance to crystallization of palm olein. Elaeis 5: 47-64.

Peled, M., Gutfinger, T. & Letan, A. 1975. Effect of water and BHT on stability of cottonseed oil during frying. Journal of the Science, Food and Agriculture 26: 1655-1666.

PORIM. 1995. PORIM Test Methods. Malaysia: Palm Oil Research Institute of Malaysia.

Shahidi, F. & Wanasundara, U.N. 2002. Methods for measuring oxidative rancidity in fats and oils. In Food Lipids: Chemistry, Nutrition, and Biotechnology, edited by Akoh, C.C. & Min, D.B. 2nd ed. New York: Marcel Dekker, Inc. pp. 465-482.

Tan, C.P., Che Man, Y.B., Jinap, S. & Yusoff, M.S.A. 2002. Effects of microwave heating on the quality characteristics and thermal properties of RBD palm olein. Innovative Food Science and Emerging Technologies 3: 157-163.

Yoshida, H., Abe, S., Hirakawa, Y. & Takagi, S. 2001. Roasting effects on fatty acids distribution of triacylglycerols and phospholipids in sesame (Sesamum indcum) seeds. Journal of the Science, Food and Agriculture 81: 620-626.

Yoshida, H., Tatsumi, M. & Kajimoto, G. 1992. Influence of fatty acids on the tocopherol stability in vegetable oils during microwave heating. Journal of American Oil Chemists Society 69: 119-125.

Yoshida, H., Nobuhisa, H. & Kajimoto, G. 1990. Microwave energy effects on quality of some seed oils. Journal of Food Sciences 55: 1412-1416.

 

 

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