1Department of Food Science, Faculty of Agriculture, University of Mazandaran, P.O. Box: 578 Sari, I.R. IRAN
2Department of Food Science and Technology, Biosystem Engineering Faculty, Agricultural Campus, University of Tehran, Karadj, I.R. IRAN
3Center for Water-Soluble Polymers, North East Wales Institute, Plas coch, Mold Road, Wrexham, LL112AW, UK
Ferula gumosa Boiss is one of the natural plants of Iran whose exudates (Barijeh) can be used in food industry. In the present study the properties of the gum extracted from tubers of Ferula gumosa were examined. For this purpose, gum was extracted from crude exudates by alcoholic extraction with 90% (v/v) ethanol. The purity of gum was relatively high, and it was composed mostly of polysaccharide. Soybean oil emulsions (10% w/w) were prepared using gum with concentration from 0.2 to 1.0 % (w/w). Surface tension, interfacial tension and creaming measurements were performed for all emulsions. Particle size measurements, light microscopy observations and rheological studies were performed for 1.0 % gum emulsion. The purified gum was found to reduce surface tension and interfacial tension of emulsions. Although particle size distribution measurements showed a slight change in particle size pattern after two month, mean diameter of particles remained constant. The creaming tests confirmed a comparatively good overall stability over a period of two months. The rheological measurements showed the shear thinning nature of emulsions prepared with the Barijeh gum. The emulsion stability was attributed to the surface adsorption mechanism.
 Zargari, A., “Medicinal Plants”, TehranUniversity Press, Tehran, vol. 2, PP. 598-602 (1989).
 Safaian, N., Shokri, M., Botanical and Ecological Study of Species of the Genus Ferula (Medicinal Plants) in MazandaranProvince, Acta Horticulturae,333, 159 (1993).
 Ghahreman, A., “Flora of Iran”, RIFR Publication, Tehran, vol. 7, PP. 800 (1986).
 Arsa, A., “Flora de l’Iran”, Imprimeriemazaher, Tehran, vol. 2, PP. 801, 905 (1984).
 Aqili-Khorasani, M. H., “Makhzan al Advia”, Safa Publication, Tehran, PP. 361, (1991).
 Jessenne, M. G., Bezanger- Beaguesne, L., Pinkas, M., Trotin, F., Sur les Gommes de Deux Gommes-Resines Bdellium et Barijeh, Plantes Medicinales et Phytotherapie,4, 241 (1974).
 Howlett, M. D. D., Clouding Agents for Use in Beverages, English patent, No. 1 569 292 (1980).
 “AOAC Official methods of analysis”, by Association of Official Analytical Chemists, Washington, USA (1984).
 Anderson, D. M. W., “Nitrogen Conversion Factors for the Proteinaceous Content of Gums Permitted as Food Additive”, In Williams, P. A., Phillips, G. O.,Wedlock, D. J., eds., Gums and Stabilizers for the Food Industry, 3, pp. 79-86, Elsevier Applied Science, New York (1986).
 Dubois, M., Gilles, K. A., Hamilton, J. K., Rebers, P.A., Smith, F., Calorimetric Method for Deter-mination of Sugar and Related Substance, Anal. Chem., 28, 350 (1956).
 Blumenkrantz, N., Asboe-Hansen, G., New Method for Quantitative Determination of Uronic Acids, Anal Biochem., 54, 484 (1973).
 Dea, I. C. M., Madden, J. K., Acetylated Pectic Polysaccharides of Sugar Beet, Food Hydrocolloids, 1, 71 (1986).
 Prud’homme, R. K., Long, R. E., Surface Tensions of Concentrated Xanthan and Polyacryamide Solutions with Added Surfactants, Journal of Colloid & Interfce Science, 93, 274 (1983).
 Shotton, E., Wibberley, K., Interfacial Films between Benzene and Solutions of Arabic Acid Salts, Journal of Pharmacy and Pharmacology, 11, 120 (1959).
 Williams, P. A., Phillips, G. O., Randall, R. C., Structure-Function Relationships of Gum Arabic, In Williams, P. A., Phillips, G. O., Weddlock, D. J., eds., Gums and Stabilizers for the Food Industry, 5, pp. 25-36, IRL Press, Oxford, (1990).
 Huang, X., Kakuda, Y., Cui, W., Hydrocolloids in Emulsions: Particle Size Distribution and Interfacial Activity, Food Hydrocollids, 15, 533 (2001).
 Arboleya, J. C., Wilde, P.J., Competitive Adsorption of Proteins with Methylcellulose and Hydroxypropyl Methylcellulose, FoodHydrocolloids,19, 485 (2005).
 Tadros, T.F., Vincent, B., “Liquid/liquid Interfaces”, In Becher, P., ed., Encyclopedia of Emulsion Technology, 1, pp. 1-39, Marcel Dekker Inc., NewYork, (1983).
 Vold, R. D., Vold, M. J., Colloid and Interface Chemistry, Addison-Wesely Publishing Co., Reading, (1983).
 Dickinson, E., Stainsby, G., “Emulsion stability”, In Dickinson, E., Stainsby, G., eds., Advances in Food Emulsions and Foams, Elsevier Applied Science, London, pp. 1-44, (1988).
 Campanella, H. O., Dorward, N. M., Singh, H. A., Study of the Rheological Properties of Concentrated Food Emulsions, Journal of Food Engineering,25, 427 (1995).
 Bergenstahl, B., Fogler, S., Steinius, P., “The Influence of Gums on the Stability of Dispersions”, In Williams, P. A., Phillips. G. O., Weddlock, D. J., eds.,Gum and Stabilizers for the Food Industry, 3, pp. 285-293, Elsevier Applied Science, New York (1986).
 Garti, N., Leser, M. E., Emulsification Properties of Hydrocolloids, Polym. Adv. Technol.,12, 123 (2001).
 Gaonkar, A. G., Surface and Interfacial Activities and Emulsion Characteristics of Some Food Hydrocolloids, Food Hydrocolloids, 5, 329 (1991).
 Randall, R. C., Phillips, G. O., Williams, P. A., The Role of the Proteinaceous Component on the Emulsifying Properties of Gum Arabic, FoodHydrocolloids, 2, 131 (1988).