RHEOLOGICAL PROPERTIES OF STRAWBERRY PUREE JAM

NADA, Y.I; ABD EL-SALAM, M. F.; KHALIL, H. I.; El NONO, M. A.

doi:10.21608/mjae.2016.97980

RHEOLOGICAL PROPERTIES OF STRAWBERRY PUREE JAM

Document Type : Original Article

Authors

¹ Agric. Eng. Dept., Fac. of Agric., Ain Shams Univ., Egypt.

² ** Food. sci. Dept., Fac. of Agric., Ain Shams Univ., Egypt.

10.21608/mjae.2016.97980

Abstract

The rheological properties of strawberry puree jam as a sample of some food gels investigated using Brookfield rotational viscometer at different temperatures (30, 40, 50, 60 and 70°C) and different solid concentration of 40, 45, 50, 55 and 63 %. The investigated samples exhibited non-Newtonian pseudoplastic behaviour and fitted well to the power law model. The effect of concentration on the apparent viscosity was studied and fitted well to power law equation. The results observed that the apparent viscosity is exponentially proportional with the concentration of strawberry puree jam at all temperatures studied. The effect of temperature on the apparent viscosity of strawberry puree jam was fitted well to Arrhenius law; activation energy was 25.26 – 97.78 kJ/mol.

Keywords

References

Ahmed, J., Ramaswamy, H.S. and Sashidhar, K.C. 2007. Rheological characteristics of tamarind ( Tamarindus indica L.) juice concentrates. LWT - Food Science and Technology 40: 225-231

Constenla, D. T., Lozano, J. E., & Crapiste, G. H. (1989). Thermophysicalproperties of clarified apple juice as a function of concentration and temperature. Journal of Food Science, 54(3), 663–668.

Diego, B. G., Alqain, Y. E., & Harjinder, S. (2009). “High Methoxyl pectin / apple particles composite gels: Effect of particle size and particle concentration on mechanical Properties and gel structure”, J of texture studies, 41, PP 171-189.

Gurses, A., & Bayrakc eken, S. (1996). Deneysel Fizikokimya. Ataturk Universitesi Yayn no: 807. K.K. Egitim Fak. Yayin no: 62. Ders Kitaplari Serisi no: 48. Erzurum, Turkiye. In Memnune S., M.

Ibarz, A. (1996). " Rheological behavior of sloe (Prunus Spinosa) fruit juices. Journal of food engineering 27: 423-430. Pear juice Concentrates", J. of Food Eng., Vol.6, Pp. 57-63.

Rao, M. A., Bourne, M. C., & Cooley, H. J. (1981). Flow properties of tomato concentrates. Journal of Texture Studies, 12, 521–538.

Rha, C. (1975). Theories and principles of viscosity. In C. Rha (Ed.), Theory: Determination and control of physical properties of food Materials (pp. 7–249).Dordrecht, The Netherlands: Reidel.

Malkin, A. I. A., Malkin, A. Y., & Isayev, A. I. (2006). Rheology: concepts, methods & applications: Chem Tec Pub.

Speers R.A. and Tung, 1986. " Concentration and Temperature Dependence of Flow behaviour of Xanthan Gum dispersions", J. of Food Sci., Vol. 51, No.l, Pp 96-98,

Steffe, J. F. (1996). Rheological methods in food process Engineering (2nd Ed.). East Lansing, ). Michigan, USA: Freeman Press.

Sugai, A.Y. (2002).Processamento descontınuo de pure de manga (Magifera indica Linn), Variedade Haden: Estudo da viabilidade do produto para pronto consumo(pp. 82). M.S. thesis. Sao Paulo,Brasil: Universidade de S̃o Paulo.

Sutherland, I.W. (2007). Biotechnology of microbialpoly saccharides in food, In: food biotechnology. 2^nd Ed., pp. 193-220. Shetty, K., Paliyath, G., Pometto, A. and Levin, E., Eds. CRC press, Boka Raton, FL.

Vitali M.A and Rao A.A.( 1984). Flow Properties of Low-Pulp Concentrated Orange Juice: Effect of Temperature and Concentration, J. of Food Sci., Vol. 49, Pp. 882-888.