International Journal of Processing and Post harvest Technology

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Effect of Anti-Caking Agents on Moisture Sorption Isotherms of Palmyra-Palm Jaggery Granules


Affiliations
1 All India Co-Ordinated Research Project on Post-Harvest Technology, Regional Agricultural Research Station, Anakapalli (A.P.), India
2 Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur (W.B.), India
     

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Jaggery granules, prepared from palmyra-palm syrup, were mixed with five levels (0.5 to 2 %w/w) of anti-caking agents [tri calcium phosphate, (TCP) or corn starch (CS)] and their moisture sorption isotherms were determined without or with addition of anticaking agents by the static equilibrium method using saturated salt solutions at four temperatures of 25, 35 and 45°C. The moisture sorption isotherms for this granular jaggery samples are Type-III isotherms and the effect of temperature on equilibrium moisture content (EMC) values upto a water activity values of 0.3 to 0.5 show no significant effect. Among two moisture sorption isotherms (MSI) models tested with the experimental data for this high sugar food, GAB model was found to be the best fit followed by Iglesias and Chirife model. The monolayer moisture content (M0) of the granular jaggery samples varied from a minimum of 4.195% (d.b.) for the granulated jaggery without anticaking agent at 45°C to a maximum of 7.303% (d.b.) for granulated jaggery with TCP and 9.178% (d.b.) for granulated jaggery with corn starch @ 2.0% at a temperature of 25°C. A decreasing trend for both Mo and C values but increasing trend for K was obtained with the increase in temperature. The monolayer moisture content of jaggery granules with addition of TCP or CS has been found to posses good correlation with temperature. The net isosteric heat of sorption (qst) of jaggery granules without addition of anti-caking agents, decreased exponentially from 29.132 to 4.833 kJ mol-1 with the increase in moisture content from 2.5 to 15% (d.b.). It was also observed that, net isosteric heat of sorption was found to be higher for the jaggery granules without addition of anti-caking agents as compared to samples with addition of anti-caking agents.

Keywords

Jaggery, Palmyra-Palm, Palm Juice, Anti-Caking Agents, Moisture Sorption Isotherm, Water Activity, Net Isosteric Heat of Sorption.
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  • AOAC (1984). Sugars and sugar products. In:Official methods of analysis of the association of official analytical chemists. (Sidney Williams,ed.) Vol.III. pp: 573-575. Association of Official Analytical Chemists, Inc., Arlington, Virginia, USA.

  • Alhamdan, A.M. and Hassan, B.H. (1999). Water sorption isotherms of date pastes as influenced by date cultivor and storage temperature. J. Food Engg., 39: 301-306.

  • Ayranci, E., Ayranci, G. and Dogantan, Z. (1990).Moisture sorption isotherms of dried apricot, figs and raisin at 20°C and 30°C. J. Food Sci., 55 (6): 1591-1593.

  • Brunauer, S., Deming, L.S., Deming, N.E. and Troller, E. (1940). On the theory of van der waals adsorption of gases. J. American Chemical Society, 62: 1723-1732.

  • Chinachoti,P. and Steinberg, M.P. (1984). Interaction of sucrose with starch during dehydration as shown by water sorption. J. Food Sci., 49(6) : 1604-1608.

  • Chirife, J. and H.A. Iglesias. (1978). Equation for fitting water sorption isotherms of foods Part-I. A review. J.Food Technol., 13: 159-174.

  • Dalibard, C. (1999). Overall view on the tradition of tapping palm trees and prospects for animal production. Livestock Res. Rural Develop., 11(1) : 1-37.

  • Greenspan, L. (1977).Humidity fixed points of binary saturated aqueous solutions. J. Res. National Bureau of Standard Phy. & Chem., 81 (A): 89-96.

  • Hassan, B.H. (1991).Water sorption isotherm of dried dates, Bulletin of Faculty of Agriculture, Univ. Cairo, 42 (4) : 1213.

  • Hasan, T. and Nurhan, A. (2004). Mathematical model for prediction of apparent viscosity of molasses. J. Food Engg., 62 : 281-289.

  • Iglesias, H.A., Chirife, J. and Lombardi, J.L. (1975).Water sorption isotherms in sugar beet ischolar_main. J. Food Technol., 10 : 299-308.

  • Iglesias, H.A. and Chirife, J. (1978).An empirical equation for fitting water sorption isotherms of fruits and related products. Canadian Institute of Food Sci Technol., 11 : 12-15.

  • Junk, W. R. and Pancoast, H. M. (1973). Boiling point elevations of sugar solutions. In H.M.Pancoast, (Ed.), Handbook of sugars: For processors, chemists & technologists (1st Ed.), (pp. 42-66), The AVI Publishing Company Inc., West Port, Connecticut.

  • Kamble, K. D. (2003). Palm gur industry in India. Indian J. Tradit. Knowl., 2 (2) : 137-147.

  • Labuza,T.P., Kaanane, A. and Chen, J.Y. (1985). Effect of temperature on the moisture sorption isotherm and water activity shift of two dehydrated foods. J. Food Sci., 50: 385 - 392.

  • Leiras, M.C. and Iglesias, H.A. (1991).Water vapour sorption isotherms of two cake mixes and their components. Internat. J. Food Sci. & Technol., 26: 91.

  • Linden, G. (1996). Methods of particle size analysis. In: Analytical techniques for foods and agricultural products; Melcion J.P., Monredon F.De., Eds.; VCH Publishers: New York, pp. 229-248.

  • Manuel, M. and Sereno, A. (1993). Effect of temperature on sorption isotherms and heats of sorption of quince jam. Internat. J. Food Sci. & Technol., 28: 241.

  • Maroulis, Z.B., Tsami, E., Marinos-Kouris, D. and Saravacos, G.D. (1988). Application of the GAB model to the moisture sorption isotherms for dried fruits, J. Food Engg., 28 : 63-78.

  • Microsoft Office Professional Edition (2003). Microsoft office excel. One Microsoft Way, Redmond, WA 98052-6399, USA: Microsoft, Inc.

  • Origin (2000). Non-linear curve fit. Ver.6.1. Northampton, MA 01060, USA: Origin Lab, Inc.

  • Pattnayak, P.K. and Misra, M.K.(2004). Energetic and economics of traditional gur preparation: A case study in Ganjam district of Orissa, India. Bio-mass & Bio-energy, 26: 79-88.

  • Peleg, M. and Hollenbach (1984). Flow conditioners and anti-caking agents. Food Technol., 38 : 93-102.

  • Rao, P.V.K. Jagannadha, Das, S.K. and Das, M. (2006).Moisture sorption isotherms of sugarcane, palmyra and date-palm jaggery. Paper presented, American Society of Agricultural and Biological Engineers Annual International Meeting (paper no. 063007), July 9- 12, Portland, USA.

  • Rao, P.V.K. Jagannadha, Das, Madhusweta and Das, S.K. (2007). Jaggery – A traditional Indian Sweetener. Indian J. Tradit. Knowl., 6 (1) : 95-102.

  • Rao, P.V.K. Janannadha, Das, Madhusweta and Das, S.K. (2008). Thermophysical properties of sugarcane, palmyra-palm and date-palm granular jaggery. Internat. J. Food Propert., 11 : 876-886.

  • Rao V.P. Surya Prakash and Rao, N.V. Mohan (1959). Some fundamentals considerations in the storage and transport of jaggery. Indian J. Sugarcane Res. & Develop., 3 (2) : 84 - 89.

  • Rizvi, S.S.H. (1986). Thermodynamic properties of foods in dehydration. In Engineering Properties of Foods (M.A. Rao and S.S.H. Rizvi -Ed.), 133-214. New York: Marcel Dekker Publications.

  • Sahu, A.P. and Paul, B.N. (1998). The role of dietary whole sugar- jaggery in prevention of respiratory toxicity of air toxics and in lung cancer. Toxicology Letters, 95(1) : 154.

  • Saravacos, G.D., Tsiourvas, D.A. and Tsami, E. (1986).Effect of temperature on the water adsorption isotherms of sultana raisins. J. Food Sci., 51(2): 381-383.

  • Sastry, A.S., Ghosh, A.K. and Bajpai, J.P. (1965). Effect of different temperatures and humidities on the keeping quality of gur (Jaggery). Indian J. Sugarcane Res. Develop., 3: 325-331.

  • Swami, S.B., Das, S.K. and Maiti, B. (2005).Moisture sorption isotherms of black gram nuggets (Bori) at varied temperatures. J. Food Engg., 67 : 477-482.

  • Thakur, A.K. (1999). Potential of jaggery (Gur) manufacturing in Punjab state. In: Proceedings of the National Seminar on Status, Problems and Prospects of Jaggery and Khandsari Industry in India (edited by Jaswant Singh). pp.70–76. Indian Institute of Sugarcane Research, Lucknow, 2 - 3 December.

  • Tsami,E., Marinos-Kouris, D. and Maroulis, Z.B. (1990).Water sorption isotherms of raisins, currants, figs, prunes and apricots. J. Food Sci., 55(6): 1594-1597.

  • Uppal, S.K. and Sharma, S. (1999). Evaluation of different methods of jaggery (gur) storage in subtropical region. Indian J. Sugarcane Technol., 14 (1) : 17-21.

  • Van Den Berg, C.(1984). Description of water activity of foods for engineering purposes by means of the GAB model of sorption. In: Engineering and food Vol.1 (B.M.McKenna-Ed.), 311. London: Elsevier Applied Science Publications.

  • Verma, V.K. and Narain, M. (1990). Moisture absorption isotherms of jaggery. J. Stored Prod. Res., 26(2): 61-66.


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  • Effect of Anti-Caking Agents on Moisture Sorption Isotherms of Palmyra-Palm Jaggery Granules

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Authors

P. V. K. Jagannadha Rao
All India Co-Ordinated Research Project on Post-Harvest Technology, Regional Agricultural Research Station, Anakapalli (A.P.), India
Madhusweta Das
Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur (W.B.), India
S. K. Das
Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur (W.B.), India

Abstract


Jaggery granules, prepared from palmyra-palm syrup, were mixed with five levels (0.5 to 2 %w/w) of anti-caking agents [tri calcium phosphate, (TCP) or corn starch (CS)] and their moisture sorption isotherms were determined without or with addition of anticaking agents by the static equilibrium method using saturated salt solutions at four temperatures of 25, 35 and 45°C. The moisture sorption isotherms for this granular jaggery samples are Type-III isotherms and the effect of temperature on equilibrium moisture content (EMC) values upto a water activity values of 0.3 to 0.5 show no significant effect. Among two moisture sorption isotherms (MSI) models tested with the experimental data for this high sugar food, GAB model was found to be the best fit followed by Iglesias and Chirife model. The monolayer moisture content (M0) of the granular jaggery samples varied from a minimum of 4.195% (d.b.) for the granulated jaggery without anticaking agent at 45°C to a maximum of 7.303% (d.b.) for granulated jaggery with TCP and 9.178% (d.b.) for granulated jaggery with corn starch @ 2.0% at a temperature of 25°C. A decreasing trend for both Mo and C values but increasing trend for K was obtained with the increase in temperature. The monolayer moisture content of jaggery granules with addition of TCP or CS has been found to posses good correlation with temperature. The net isosteric heat of sorption (qst) of jaggery granules without addition of anti-caking agents, decreased exponentially from 29.132 to 4.833 kJ mol-1 with the increase in moisture content from 2.5 to 15% (d.b.). It was also observed that, net isosteric heat of sorption was found to be higher for the jaggery granules without addition of anti-caking agents as compared to samples with addition of anti-caking agents.

Keywords


Jaggery, Palmyra-Palm, Palm Juice, Anti-Caking Agents, Moisture Sorption Isotherm, Water Activity, Net Isosteric Heat of Sorption.

References