Sorption equilibrium moisture and isosteric heat of Chinese wheat flours

Main Article Content

X. Han
X. Wang
X.-J. Li
P. Jiang

Keywords

Chinese wheat flours, moisture sorption isotherm, isosteric heat, Mixolab pasting behaviour

Abstract

Data on equilibrium moisture content (EMC) for six Chinese wheat flour varieties were collected by a gravimetric method at 11-96% equilibrium relative humidity (ERH) and a temperature range of 10-35 °C. Six models were fitted to the sorption data, with the modified Guggenheim Anderson deBoer equation, modified Henderson equation (MHE), and a polynomial equation being the best fits. At a constant ERH, the EMC was negatively correlated with temperature, whereas there was a strong effect of temperature on the sorption isotherms of the wheat flours. Initially, the isosteric heats of adsorption for the wheat flours decreased rapidly with increasing sample moisture content (MC); however, when MC was higher than 15% of the wet basis, further increases in MC caused a slight decrease in heat adsorption values. The heat of vaporisation of the wheat flours approached the latent heat of pure water at a moisture content of ~17.5% wet basis, which was ~2,500 kJ/kg. The isosteric heat of sorption values of the wheat flours predicted by the modified Chung-Pfost equation (MCPE) and MHE model negatively correlated with temperature. At 70% ERH, the safe-storage MC of the wheat flours were 14.71 and 13.88% wet basis at 25 and 35 °C, respectively. Among the six varieties of wheat flours, dumpling flour had significantly higher peak and conclusion temperatures of gelatinisation, and solvent retention capacity (water and lactate) than Gaojin flour, but the latter had a higher peak enthalpy of gelatinisation than dumpling flour. Mixolab pasting analysis at constant hydration further showed that Gaojin four had significantly higher protein weakening and starch setback, but less dough development time and stability time, and lower amylase activity than dumpling flour. These may explain why Gaojin flour has higher moisture sorption isotherms than dumpling flour at the studied temperature range

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References

AACC International, 2000. Approved methods of the AACC (10th Ed.). Method 56-11: solvent retention capacity profile. AACI, St. Paul, MN, USA.
Aguerre, R.J., Suarez, C. and Viollaz, P.E., 1989. New BET type multilayer sorption isotherms: Part II. Modelling water sorption in foods. Lebensmittel-Wissenschaft und Technologie 22: 192-195.
Al-Muhtaseb, A.H., McMinn, W.A.M. and Magee, T.R.A., 2004. Water sorption isotherms of starch powder. Part 2: Thermodynamic characteristic. Journal of Food Engineering 62: 135-142.
Association of Official Analytical Chemists (AOAC), 1980. Official methods of analysis (13th Ed.). AOAC, Washington, DC, USA.
Aviara, N.A. and Ajibola, O., 2002. Thermodynamics of moisture sorption in melon seed and cassava. Journal of Food Engineering 55(2): 107-113.
Ayerst, G., 1969. The effects of moisture and temperature on growth and spore germination of some fungi. Journal of Stored Products Research 5: 127-141.
Bruin, S. and Berg, C.V.D., 1981. Water activity and its estimation in food system. In: Rockland, L.B. and Stewart, G.F. (eds.) Theoretical aspect in water activity and influence on food quality. Academic Press, New York, NY, USA, pp. 1-45.
Bushuk, W. and Winkler, C.A., 1957. Sorption of water vapor on wheat flour, starch. Cereal Chemistry 34: 73-86.
Cadden, A.M., 1988. Moisture sorption characteristics of several food fibers. Journal of Food Science 53: 1150-1155.
Chen, C. and Morey, R.V., 1989. Comparison of four EMC/ERH equations. Transactions of the ASAE 32: 983-990.
Cherian, G. and Chinachoti, P., 1996. 2H and 7O nuclear magnetic resonance study of water in gluten in the glassy and rubbery state. Cereal Chemistry 73: 618-624.
Cooksey, K., 2004. Important factors for selecting food packaging materials based on permeability. PhD thesis, Clemson University, Chemson, SC, USA.
Deman, J.M., 1999. Principles of food chemistry (3rd Ed.). Aspen Publishers Inc., Frederick, MD, USA, pp. 1-31.
Demczuk, B. and Hoffmann-Ribani, R., 2012. Effects of environmental conditions on characteristics of annatto seed by-product. Quality Assurance and Safety of Crops and Foods 4(5): e20-e28.
Dural, N.H. and Hines, A.L., 1993. Adsorption of water on cereal-bread type dietary fibers. Journal of Food Engineering 20: 17-43.
Erbas, M., Ertugay, F. and Certel, M., 2005. Moisture adsortion behavior of semolina and farina. Journal of Food Engineering 69: 191-198.
Fasina, O., Ajibola, O.O. and Tyler, R., 1999. Thermodynamics of moisture sorption in winged bean seed and gari. Journal of Food Process Engineering 22: 405-418.
Guttieri, M.J., Becker, C. and Souza, E.J., 2004. Application of wheat meal solvent retention capacity tests within soft wheat breeding population. Cereal Chemistry 81: 261-266.
Hu, R.B., Qian, J.C., Deng, Z.Y. and Zhang, Z.X., 2006. The factors influencing on the color of Chinese white salted noodle [in Chinese with English abstract]. Acta Agronomica Sinica 3: 1338-1343.
Irzyniec, Z. and Klimczak, J., 2003. Effect of temperature on sorption isotherms of Brussels sprouts. Nahrung/Food 47: 24-27.
Jayas, D.S. and Mazza, G., 1993. Comparison of five three-parameter equations for the description of adsorption data of oats. Transactions of the ASAE 36: 119-125.
Kapsalis, J.G., 1987. Influence of hysteresis and temperature on moisture sorption isotherms. In: Rockland, L.B. and Beuchat, L.R. (eds.) Water acitivity: theory and applications to foods. Marcel Dekker Inc., New York, NY, USA, pp. 173-213.
Kaymak-Ertekin, F. and Gedik, A., 2004. Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes. LWT ? Food Science Technology 37: 429-439.
Li, X.J. and Jiang, P., 2015. A polynomial equation for fitting EMC/ERH data of cereals and soybean. Journal of the Chinese Cereals and Oils Association 30(10): 90-94.
Li, X.J., 2012. The hygroscopic properties and sorption isosteric heats of different Chinese wheat types. Journal of Food Research 1: 82-98.
Li, X.J., Cao, Z.Y., Wei, Z.Y., Feng, Q.Y., and Wang, J.S., 2011. Equilibrium moisture content and sorption isosteric heats of five wheat varieties in China. Journal of Stored Products Research 47: 39-47.
Martín-Santos, J., Vioque, M. and Gómez, R., 2012. Thermodynamic properties of moisture adsorption of whole wheat flour. Calculation of net isosteric heat. International Journal of Food Science and Technology 47: 1487-1495.
Menkov, N.D., Durakova, A.G. and Krasteva, A., 2005. Moisture sorption isotherms of common bean flour at several temperatures. Journal of Environmental, Agricultural and Food Chemistry 4: 892-898.
Mok, C. and Dick, J.W., 1991. Moisture adsorption of damaged wheat starch. Cereal Chemistry 68: 405-409.
Moreira, R., Chenlo, F., Torres, M.D. and Prieto, D.M., 2010. Water adsorption and desorption isotherms of chestnut and wheat flours. Industrial Crops and Products 32: 252-257.
Navaratne, S.B., 2013. Selection of polymer based packing material in packing of hygroscopic food products for long period of storage. European International Journal of Science and Technology 2(7): 1-6.
Öztekin, S. and Soysal, Y., 2000. Comparison of adsorption and desorption isosteric heats for some grains. Agricultural Engineering International: the CIGR Journal of Scientific Research and Development 2: 1-17.
Pfost, H.B., Maurer, S.G., Chung, D.S. and Milliken, G.A., 1976. Summarizing and reporting equilibrium moisture data for grains. Vol. 76, 3520. American Society of Agricultural Engineers, St. Joseph, MI, USA.
Pollatos, E.P., Riganakos, K.A. and Demertzis, P.G., 2013. Moisture sorption characteristics of Greek durum wheat semolina. Starch/Stärke 65(11-12): 1051-1060.
PRC Industry, 1993. Wheat flour for noodle making. LS/T 3202-1993 (SB/T 10137-93). Available at: http://down.foodmate.net/standard/sort/6/3621.html
Riganakos, K.A. and Kontominas, M.G., 1997. Study of water sorption of flours (wheat and soy) using a hygrometric method: effect of relative humidity during heat treatment. Zeitschrift fuer Lebensmittel-Untersuchung und-Forschung 204: 369-373.
Roman-Gutierrez, A.D., Guilbert, S. and Cuq, B., 2002. Distribution of water between wheat flour components: a dynamic water vapour adsorption study. Journal of Cereal Science 36: 347-355.
Rosell, C.M., Collar, C. and Haros, M., 2007. Assessment of hydrocolloid effects on the thermo-mechanical properties of wheat using the mixolab. Food Hydrocolloids 21: 452-462.
SPSS Inc., 2006. SPSS for Windows, Release 13.0.1. SPSS Inc., Chicago, IL, USA.
Sun, D.W. and Woods, J.L., 1994. The selection of sorption isotherm equations for wheat based on the fitting of available data. Journal of Stored Product Research 30: 27-43.
Taylor, N.W., Cluskey, J.E. and Senti, F.R., 1961. Water sorption by dextrans and wheat starch at high humidities. Journal of Physical Chemistry 65: 1810-1816.
Thompson, T.L., Peart, R.M. and Foster, G.H., 1986. Mathematical simulation of corn drying: a new model. Transactions of the ASAE 11: 582-586.
Thorpe, G.R., 2001. Physical basis of aeration. In: Navarro, S. and Noyes, R. (ed.) The mechanics and physical of modern grain aeration management. CRC Press, Boca Raton, FL, USA, pp. 135-144, 186.
Wang, M.J., Wu, X.L., Yuan, J., Ju, X.R. and Zhou, Z., 2012. Moisture adsorption and desorption characteristics of wheat flour [In Chinese with English abstract]. Food Science 33(19): 45-51.