Oxidation-related quality and benzo(a)pyrene content of imported palm and canola oils after domestic industrial bleaching and deodorization

수입 팜기름과 카놀라기름의 국내에서의 산업적 탈색과 탈취에 따른 산화관련 특성과 벤조피렌 함량

  • Park, Jaehyun (Department Food and Nutrition, Inha University) ;
  • Choe, Eunok (Department Food and Nutrition, Inha University)
  • 박재현 (인하대학교 식품영양학과) ;
  • 최은옥 (인하대학교 식품영양학과)
  • Received : 2017.06.10
  • Accepted : 2017.07.13
  • Published : 2017.12.31


Effects of bleaching and deodorization on the quality of imported palm and canola oils were evaluated. Imported palm oil and deacidified canola oil were bleached with acid clay, followed by deodorization. Oxidation-related quality was evaluated by determining fatty acid composition by GC, acid and peroxide values, induction period by Rancimat, and off-flavor compounds by GC-MS. Tocopherols and benzo(a)pyrene were analyzed by HPLC. Acid and peroxide values were decreased by bleaching and deodorization, and tocopherol content was decreased to 60-70% (p<0.05). Aldehydes were major off-flavor compound class of imported oils, most of which were removed after deodorization. No significant change was observed in benzo(a)pyrene content (${\sim}0.4{\mu}g/kg$) of both oils by bleaching and deodorization (p>0.05). The oxidation-related quality of palm and canola oils was more improved after industrial bleaching than by deodorization. These results suggest that a careful control of bleaching during domestic refining can improve the quality of palm and canola oils.


palm oil;canola oil;bleaching;deodorization;quality


  1. Korea Customs Service. Trade statistics. Available from: Accessed June 06, 2017.
  2. Cmolik J, Pokorny J. Physical refining of edible oils. Eur. J. Lipid Sci. Technol. 102: 472-486 (2000)<472::AID-EJLT472>3.0.CO;2-Z
  3. Chandrasekar V, Sampath C, Prasanna D, Regupathi I. Refining of edible oils: A critical appraisal of current and potential technologies. Int. J. Food Sci. Tech. 50: 13-23 (2015)
  4. Roden A, Ullyot G. Quality control in edible oil processing. J. Am. Oil Chem. Soc. 61: 1109-1111 (1984)
  5. Kim HY, Chung SY, Sho YS, Park S, Lee EJ, Suh JH, Lee YD, Choi WJ, Kim JS, Eom JY, Park HO, Jin MS, Kim DS, Ha SC, Lee JO. Concentration of polycyclic aromatic hydrocarbons in cereals, pulses, potatoes, and their products. Korean J. Food Sci. Technol. 37: 537-541 (2005)
  6. Hu S, Woo GJ, Choi D. Determination of benzo(a)pyrene in olive oils. Anal. Sci. Technol. 20: 170-175 (2007)
  7. World Health Organization. IARC Monographs on the evaluation of carcinogenic risks to humans. International agency for research on cancer. Available from: Accessed June 06, 2017
  8. Pandey MK, Mishra KK, Khanna SK, Manoj K. Detection of polycyclic aromatic hydrocarbons in commonly consumed edible oils and their likely intake in the Indian population. J. Am. Oil Chem. Soc. 81: 1131-1136 (2004)
  9. Sung T, Lee J, Lee H. Benzo(a)pyrene contents in commercial vegetable oils and changes during processing of vegetable oils. Korean J. Food Sci. Technol. 44: 269-273 (2012)
  10. Olatunji OS, Fatoki OS, Ximba BJ, Opeolu BO. Polycyclic aromatic hydrocarbons (PAHs) in edible oil: Temperature effect on recovery from base hydrolysis product and health risk factor. Food and Public Health. 4: 23-30 (2014)
  11. Pschenitza M, Hackenberg R, Niessner R, Knopp D. Analysis of benzo(a)pyrene in vegetable oils using molecularly imprinted solid phase extraction (MISPE) coupled with enzyme-linked immunosorbent assay (ELISA). Sensors (Basel). 14: 9720-9737 (2014)
  12. AOCS. Official Methods and Recommended Practices of the AOCS. The American Oil Chemists' Society, Champaign, IL, USA (1990)
  13. Ministry of Food and Drug Safety. Korean Food Code. Available from Accessed June 06, 2017
  14. Reza F, Razieh N, Mitra R, Mahboobe S. Kinetic parameter determination of vegetable oil oxidation under Rancimat test conditions. Eur. J. Lipid Sci. Technol. 110: 587-592 (2008)
  15. Lee S, Chung M, Kim M, Baek H, Lee S. Volatile compounds of Elsholtzia splendens. Korean J. Food Sci. Technol. 37: 339-344 (2005)
  16. Van Den Dool H, Kratz DJ. A generalization of the retention index system including liner temperature programmed gas-liquid partition chromatography. J. Chromatogr. 11: 463-467 (1963)
  17. Lee J, Choe E. Effects of phosphatidylcholine and phosphatidylethanolamine on the photooxidation of canola oil. J. Food Sci. 74: 481-486 (2009)
  18. Low KS, Lee CK, Kong LY. Decolorisation of crude palm oil by acid-activated spent bleaching earth. J. Chem. Technol. Biotechnol. 72: 67-73 (1998)<67::AID-JCTB881>3.0.CO;2-N
  19. Wroniak M, Krygier K, Kaczmarczyk M. Comparison of the quality of cold pressed and virgin rapeseed oil with industrially obtained oils. Pol. J. Food Nutr. Sci. 58: 85-89 (2008)
  20. Skevin D, Domijan T, Kraljic K, Kljusuric JG, Nederal S, Obranovic M. Optimization of bleaching parameters for soybean oil. Food Technol. Biotechnol. 50: 199-207 (2012)
  21. Silva SM, Sampaio KA, Ceriani R, Verhe R, Stevens C, De Greyt W, Meirelles AJA. Adsorption of carotenes and phosphorus from palm oil onto acid activated bleaching earth: Equilibrium, kinetics and thermodynamics. J. Food Eng. 118: 341-349 (2013)
  22. Zschau W. Bleaching of edible fats and oils, Eur. J. Lipid Sci. Technol. 103: 505-508 (2001)<505::AID-EJLT505>3.0.CO;2-7
  23. Hopia A. Analysis of high molecular weight autoxidation products using high performance size exclusion chromatography. II. Changes during processing. J. Lebensm-Wiss. Technol. 26: 568-571 (1993)
  24. Min DB, Choe E. Mechanisms and factors of edible oil oxidation. Comp. Rev. Food Sci. Food Saf. 6: 169-186 (2006)
  25. Bachari-Saleh Z, Ezzatpanah H, Aminafshar M, Safafar H. The effect of refining process on the conjugated dienes in soybean oil. J. Agric. Sci. Tech. 15: 1185-1193 (2013)
  26. De Greyt WF, Kellens MJ, Huyghebaert AD. Effect of physical refining on selected minor components in vegetable oils. Lipids 101: 428-432 (1999)<428::AID-LIPI428>3.0.CO;2-T
  27. Ostric-Matijasevic B, Turkulov J, Karlovic D. Quality of sunflower oil bleached during deodorization. J. Am. Oil Chem. Soc. 57: 323-325 (1980)
  28. Ergonul PG, Koseoglu O. Changes in ${\alpha}$-, ${\beta}$-, $\gamma$- and ${\delta}$-tocopherol contents of mostly consumed vegetable oils during refining process, CyTA-J. Food. 12: 199-202 (2014)
  29. Naz S, Sherazi STH, Talpur FN. Changes of total tocopherol and tocopherol species during sunflower oil Processing. J. Am. Oil Chem. Soc. 88: 127-132 (2011)
  30. Reiners J, Grosch W. Odorants of virgin olive oils with different flavor profiles. J. Agric. Food Chem. 46: 2754-2763 (1998)
  31. Morales MT, Rios JJ, Aparicio R. Comparative study of virgin olive oil sensory defects. Food Chem. 91: 293-301 (2005)
  32. Fenwick GR, Heaney RK, Mullin WJ. Glucosinolates and their breakdown products in food and food plants. Crit. Rev. Food Sci. Nutr. 18: 123-201 (1983)
  33. Frankel EN. Lipid oxidation: Mechanisms, products and biological significance. J. Am. Oil Chem. Soc. 61: 1908-1917 (1984)
  34. Pupin AM, Toledo FMC. Benzo(a)pyrene in brazilian vegetable oils. Food Addit. Contam. 13: 639-646 (1996)