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Analysis of Functional Properties of Peanut Protein Isolates as Affected by Oil Extraction Methods


Affiliations
1 Institute of Food Technology, Nutrition and Consumers Studies, Schools of Agriculture, Njala University, Sierra Leone
2 Department of Animal Science, School of Agriculture, Njala University, Sierra Leone
     

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The physico-chemical and functional characteristics of peanut protein isolates extracted from peanut cakes obtained as by-products from two different peanut oil extraction methods (cold pressed and heat pressed) were studied. Isolates from cold pressed method (CPI) exhibited superior physical properties such as particle size (as seen from scanning electron micrographs), and thermal denaturation profiles as obtained from differential scanning calorimeter, compared to isolates obtained from heat pressed method (HPI). Solubility profiles obtained for CPI and HPI were pH dependent with CPI been more soluble at all pH levels. Solubility around the isoelectric pH range of 4.5 - 5.5 was low for both samples. Other functional properties such as emulsification, whipping, fat and water absorption were better exhibited by CPI than HPI. From the SE-HPLC, HPI recorded a higher molecular weight (16.64KDa) than CPI (14.91KDa), while CPI had higher biochemical components (protein, carbohydrates) than HPI.

Keywords

Peanut Protein Isolate, Physical, Functional, Chemical Properties.
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  • AOAC Methods 932.06, 925.09, 923.03. (1990).Official methods of association of official analytical chemists, International, P. Cunniff (Ed.), 15th Ed. Association of Official Analytical Chemists, Arlington, VA, United States.

  • AOAC (1995).Official methods of analysis. 16th Ed., Association of Official Analytical Chemists, Washington, DC., U.S.A.

  • Barbut, S. (1999). Determining water and fat holding properties. In: G.M. Hall, Editor, Methods of testing protein functionality, Blackie Academic and Professional, New York, pp. 186–225.

  • Basha, S.M. and Pancholy, S.K. (1982). Composition and characteristics of basic proteins from peanut (Arachis hypogaea L.). J. Agric. Food Chem., 30 : 1176–1179.

  • Chakraborty, P. (1986). Coconut protein isolate by ultrafiltration. In: M. LeMeguer and P. Jelen, Editors,Food Engineering and Process Applications Vol. 2, Elsevier Applied Science Publishers, New York 308–315.

  • Cherry, J.P. and McWatters, K.H. (1975). Solubility properties of proteins relative to environmental effects and moist heat treatment of full fat peanuts. J. Food Sci., 40 : 1257–1259.

  • Khalid, E.K., Babiker, E.E. and El Tinay, A.H. (2003). Solubility and functional properties of sesame seed proteins as influenced by pH and/ or salt concentration. Food Chem., 82 : 361-366.

  • Lawal, O.S., Adebowale, K.O. and Adebowale, Y.A. (2007). Functional properties of native and chemically modified protein concentrates from bambara groundnut. LWT – Food Sci. Technol., 1520 – 1526

  • Lin, M.J.Y., Humbert, E.S. and Sosulski, F.W. (1974). Certain functional properties of sun flour meal product. J. Food Sci., 39 : 368-370.

  • Mashair, A., Suliman, Abdullahi H. El Tinay, Abd Elmoneim O., Elkhalifa, E., Babiker, E. and Elhadi, A.I.E. (2006). Solubility as influenced by pH and NaCl concentaration and functional properties of lentil proteins isolate. Pakistan J.Nutr., 5 (6) : 589-593.

  • Meng, G..T and Ma, C.Y. (2001). Thermal properties ofPhaseolus angularis (red bean) globulin. Food Chem., 23 : 453–460.

  • Moure, A., Sineiro, J., Dominguez, J. and Parajo, J.C. (2006). Functionality of oilseed protein products: A review. Food Res. Internat., 39 : 945–963.

  • Neto, V.Q., Narain, N., Silva, J.B. and Bora, P.S. (2001). Functional properties of raw and heat processed cashew nut (Anarcarduim occidentale L.) kernel protein isolate. Nahrung/Food, 45 : 258–262.

  • Parakash, V. and Narasimha Rao, M.S. (1986). Physicochemical properties of oilseed proteins. CRC Crit. Rev. Biochem., 20 (5) : 265-363.

  • Prinyawiwatkul, W., Beuchat, L.R. and McWatters, K.H. (1993). Functional property changes in partially defatted peanut flour caused by fungal fermentation and heat treatment. J. Food Sci., 58 : 1318–1323.

  • Radha, C., Chevalot, I., Framboisier, X., Chenu, S. and Marc, I. (2007). Preparation and characterization of a protein hydrolysate from an oilseed flour mixture. Food Chem., 106 (3) : 1166 - 1174.

  • Ragab, D.M., Babiker, E.E. and El Tinay, A.H. (2004).Fractionation, solubility and functional properties of cowpea (Vigna unguiculata) proteins as affected by pH and/or salt concentration. Food Chem., 84 : 207-212.

  • Tang, C.H. (2007). Functional properties and in vitro digestibility of buckwheat protein products: Influence of processing. Food Res. Internat., 40 (8) : 1003 – 1011.

  • Tate, P.V., Chavan, J.K., Patil, P.B. and Kadam, S.S. (1990). Processing of commercial peanut cake into food-grade meal and its utilization in preparation of cookies. Plant Foods & Human Nutr., 40 :115–121.

  • Were, L, Hettiarachchy, N.S. and Kalapathy, U. (1997). Modified soy proteins with improved foaming and water hydration properties. J. Food Sci., 62 (4) : 821–823.

  • Wu, U., Hettiarachchy, S. and Qi, M. (1998). Hydrophobicity, solubility, and emulsifying properties of soy protein peptides prepared by papain modification and ultrafiltration. J. American Oil Chemical Society, 75 : 450–845.

  • Yu, J., Ahmedna, M. and Goktepe, I. (2007). Peanut protein concentrate: Production and functional properties as affected by processing. Food Chem., 103 : 121–129.


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  • Analysis of Functional Properties of Peanut Protein Isolates as Affected by Oil Extraction Methods

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Authors

Tamba S. Sonda
Institute of Food Technology, Nutrition and Consumers Studies, Schools of Agriculture, Njala University, Sierra Leone
Sanpha Kallon
Department of Animal Science, School of Agriculture, Njala University, Sierra Leone

Abstract


The physico-chemical and functional characteristics of peanut protein isolates extracted from peanut cakes obtained as by-products from two different peanut oil extraction methods (cold pressed and heat pressed) were studied. Isolates from cold pressed method (CPI) exhibited superior physical properties such as particle size (as seen from scanning electron micrographs), and thermal denaturation profiles as obtained from differential scanning calorimeter, compared to isolates obtained from heat pressed method (HPI). Solubility profiles obtained for CPI and HPI were pH dependent with CPI been more soluble at all pH levels. Solubility around the isoelectric pH range of 4.5 - 5.5 was low for both samples. Other functional properties such as emulsification, whipping, fat and water absorption were better exhibited by CPI than HPI. From the SE-HPLC, HPI recorded a higher molecular weight (16.64KDa) than CPI (14.91KDa), while CPI had higher biochemical components (protein, carbohydrates) than HPI.

Keywords


Peanut Protein Isolate, Physical, Functional, Chemical Properties.

References