Abstract
Gas-liquid chromatography and high-performance liquid chromatography (HPLC) were used to determine fatty acids and triglyceride (TG) compositions of crude palm oil (CPO), refined, bleached, and deodorized (RBD) palm oil, RBD palm olein, and RBD palm stearin, while their thermal profiles were analyzed by differential scanning calorimeter (DSC). The HPLC chromatograms showed that the TG composition of CPO and RBD palm oil were quite similar. The results showed that CPO, RBD palm oil, RBD olein, and superolein consist mainly of monosaturated and disaturated TG while RBD palm stearin consists mainly of disaturated and trisaturated TG. In DSC cooling thermograms the peaks of triunsaturated, monosaturated and disaturated TG were found at the range of −48.62 to −60.36, −25.89 to −29.19, and −11.22 to −1.69°C, respectively, while trisaturated TG were found between 13.72 and 27.64°C. The heating thermograms of CPO indicated the presence of polymorphs β2′, α, β2′, and β1. The peak of CPO was found at 4.78°C. However, after refining, the peak shifted to 6.25°C and became smaller but more apparent as indicated by RBD palm oil thermograms. The heating and cooling thermograms of the RBD palm stearin were characterized by a sharp, high-melting point (high-T) peak temperature and a short and wide low-melting point (low-T) peak temperature, indicating the presence of occluded olein. However, for RBD palm olein, there was only an exothermic low-T peak temperature. The DSC thermograms expressed the thermal behavior of various palm oil and its products quite well, and the profiles can be used as guidelines for fractionation of CPO or RBD palm oil.
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References
Tan, B.K., F.C.H. Oh, W.L. Siew, and K.G. Berger, Characteristics of Processed Palm Oils, in Palm Oil Product Technology in the Eighties, PORIM/Planters’ Seminar, Incorporated Society of Planters, Kuala Lumpur, Malaysia, 1981, pp. 127–143.
Ong, A.S.H., Y.M. Choo, and C.K. Ooi, Developments in Palm Oil, in Developments in Oils and Fats, edited by R.J. Hamilton, Blackie Academic and Professional, London, 1995, pp. 153–191.
Busfield, W.K., and P.N. Proschogo, Thermal Analysis of Palm Stearine by DSC, J. Am. Oil Chem. Soc. 67:171–175 (1990).
Busfield, W.K., and P.N. Proschogo, Hydrogenation of Palm Stearin: Changes in Chemical Composition and Thermal Properties, Ibid.:176–181 (1990).
Yap, P.H., J.M. deMan, and L. deMan, Polymorphism of Palm Oil and Palm Oil Products, Ibid.:693–697 (1989).
Kawamura, K., The DSC Thermal Analysis of Crystallization Behavior in Palm Oil. II, Ibid.:48–52 (1980).
Rossell, J.B., Differential Scanning Calorimetry of Palm Kernel Oil Products, Ibid.:505–511 (1975).
Okiy, D.A., Interaction of Triglycerides and Diglycerides of Palm Oil, Oleagineux 33:625–628 (1978).
Che Man, Y.B., and P.Z. Swe, Thermal Analysis of Failed-Batch Palm Oil by Differential Scanning Calorimetry, J. Am. Oil Chem. Soc. 72:1529–1532 (1995).
Swe, P.Z., Y.B. Che Man, and H.M. Ghazali, Polymorphic Study of High Melting Glycerides of Palm Olein Crystals, Mal. Oil Sci. Tech. 4:205–208 (1995).
Official and Tentative Methods of the American Oil Chemists’ Society, 4th edn., American Oil Chemists’ Society, Champaign, 1984, Method 28.023.
Haryati, T., K. Pamin, and L. Buana, Determination of Oil Content by Gas Chromatography, Mal. Oil Sci. Tech. 4:190–192 (1995).
Haryati, T., and J.S. Tahardi, Leaf Palmitic Acid as Possible Parameter for Early Selection of Potentially High Yielding Oil Palm, Menara Perkebunan 59:81–85 (1991).
Swe, P.Z., Y.B. Che Man, and H.M. Ghazali, Improved NARP-HPLC Method for Separating Triglycerides of Palm Olein and Its Solid Fractions Obtained at Low Temperature Storage, Food Chem. 56:181–186 (1996).
Ghazali, H.M., A. Maisarah, S. Yusof, and M.S.A.M. Yusoff, Triglyceride Profiles and Melting Properties of Lipase-Catalyzed Transesterified Palm Stearin and Coconut Oil, Asia Pacific Journal of Mol. Biol. Biotech. 3:280–289 (1995).
Wong, S., Malaysia’s Total Connection to the World for Specialty Fats, Atlanto Sdn. Bhd., Selangor, Malaysia, 1991, pp. 235–236.
Ng, W.L., A Study of the Kinetics of Nucleation in a Palm Oil Melt, J. Am. Oil Chem. Soc. 76:879–882 (1990).
Berger, K.G., and E.E. Akehurst, Some Applications of Differential Thermal Analysis to Oils and Fats, J. Food Technol. 1:237–247 (1966).
Garti, N., J.S. Aronhime, and S. Sarig, The Role of Chain Length and an Emulsifier on the Polymorphism of Mixture of Triglycerides, J. Am. Oil Chem. Soc. 66:1085–1089 (1989).
Ng, W.L., and F.C.H. Oh, DSC Study on Palm Olein Blended with Tripalmitin, PORIM International Palm Oil Conference on Chemistry and Technology, 1991, PORIM, Kuala Lumpur, Malaysia, pp. 296–304.
Ng, W.L., Nucleation from Palm Oil Melt, PORIM International Palm Oil Conference on Chemistry and Technology, 1990, PORIM, Kuala Lumpur, Malaysia, 60–64.
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Che Man, Y.B., Haryati, T., Ghazali, H.M. et al. Composition and thermal profile of crude palm oil and its products. J Amer Oil Chem Soc 76, 237–242 (1999). https://doi.org/10.1007/s11746-999-0224-y
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DOI: https://doi.org/10.1007/s11746-999-0224-y