Abdurrahman Ghaderi & Soleiman Abbasi
Soleiman Abbasi, Yoghurt powder production using microwave–vacuum drier: drying kinetics, mathematical modeling, and characteristics(2017)SDRP Journal of Food Science & Technology 2(2)
Drying behavior of fat-free yoghurt was studied and modeled at various microwave powers (MWP), absolute pressures, and thicknesses in a microwave–vacuum drier (MVD). Then some quality properties of powders were compared with one prepared by commercial freeze drier (FD). The results showed the drying time of MVD was 80% shorter than FD, while in terms of properties, except for color and bulk density, no significant differences were seen. Furthermore, any change of absolute pressure at constant MWP did not affect the drying time whilst any variation in MWP and thickness showed a significant impact on drying time. Moreover, Logistic and Midilli et al. models showed the highest fitting which can be used for prediction purposes. Effective moisture diffusivity of yoghurt was over the range of 4.426×10-10 – 2.831×10-9 m2/s. The activation energy for drying at the absolute pressures of 600 and 800 mbar was about 2.908 and 2.934 W/g, respectively.
Keywords: Yoghurt; Microwave; Freeze drying; Thin layer drying; Modeling
Abbasi, S. and Azari, S. (2009). Novel microwave-freeze drying of onion slices. International Journal of Food Science & Technology, 44: 974?979.View Article
Akpinar, E. K. (2006). Determination of suitable thin layer drying curve model for some vegetables and fruits. Journal of Food Engineering, 73: 75?84.View Article
Cajigas, S. D. (1981). Instant yoghurt composition, United States Patent 4, 289 788.
Chandra, P. K. and Singh R. P. (1995). Applied Numerical Methods for Food and Agricultural Engineers. CRC Press, Boca Raton, FL pp. 163?167.
Cui, Z. W., Xu, S. Y., and Sun, D. W. (2004a). Effect of microwave?vacuum drying on the carotenoids retention of carrot slices and chlorophyll retention of Chinese chive leaves. Drying Technology, 22: 563?565.View Article
Cui, Z. W., Xu, S. Y. and Sun, D. W. (2004b). Microwave?vacuum drying kinetics of carrot slices. Journal of Food Engineering, 65: 157?164.View Article
Doymaz, I. (2005). Influence of pretreatment solution on the drying of sour cherry. Journal of Food Engineering, 78: 591?596.View Article
Esmaeilzadeh Nasiri, M, and Abbasi, S. (2016). Effect of hydrocolloids and drying conditions on stability, rheological and sensoryp of reconstituted yoghurt (Instant Yoghurt). Focusing on Modern Food Industry (FMFI), 5: 6?15.View Article
Ghaderi, A., Abbasi, S., and Hamidi, Z. (2010). Yoghurt powder production using a microwave?vacuum drier. Iranian Food Science and Technology Research Journal, 6 (3): 210?222
Giri, S.K. and Prasad, S. (2007). Drying kinetics and rehydration characteristics of microwave?vacuum and convective hot-air dried mushrooms. Journal of Food Engineering, 78: 512?521.View Article
Hamann, W.T. and Marth, E. H. (1984). Survival of Streptococcus thermophilus and Lactobacillus bulgaricus in commercial and experimental yogurts. Journal of Food Protection, 47: 781?786.View Article
Hayaloglu, A. A., Karabulut, I., Alpaslan M. and Kelbaliyev, G. (2007). Mathematical modeling of drying characteristics of strained yoghurt in a convective type tray-dryer. Journal of Food Engineering, 78: 109?117.View Article
Henderson, S. M. and Pabis, S. (1961). Grain drying theory I: temperature effect on drying coefficient. Journal of Agriculture Research Engineering, 6: 169?174.
Jaya, S. (2009). Microstructure analysis of dried yogurt: Effect of different drying methods. International Journal of Food Properties, 12: 469?481.View Article
Karathanos, V. T. (1999). Determination of water content of dried fruits by drying kinetics. Journal of Food Engineering, 39: 337?344. 00132-0View Article
Kim, S.S., and Bhowmik, S.R. (1994). Moisture sorption isotherms of concentrated yoghurt and microwave?vacuum dried yoghurt powder. Journal of Food Engineering, 21: 157?175. 90184-8View Article
Kim, S.S., and Bhowmik, S.R. (1995). Effective moisture diffusivity of plain yoghurt undergoing microwave?vacuum drying. Journal of Food Engineering, 24: 137?138. P1614-4View Article
Kumar, P. and Mishra, H. N. (2004). Yoghurt powder?a review of process technology, storage and utilization. Food and Bioproducts Processing, 82(C2): 133?142.View Article
Lewis, W. K. (1921). The rate of drying of solid materials. Journal of Industrial Engineering, 13: 427?443.View Article
Lopez-malo, A., E. Palou, G. V. Barbosa-Canovas, J. Welti-Chanes and B.G. Swanson. (1998). Polyphenoloxidase activity and color changes during storage of high hydrostatic pressure treated avocado puree. Food Research International, 31(8): 549?556. 00028-9View Article
McMinn, W. A. M. (2006). Thin-layer modelling of the convective, microwave, microwave?convective and microwave?vacuum drying of lactose powder. Journal of Food Engineering, 72: 113?123.View Article
Nursten, H. (2005). The Maillard Reaction, Chemistry, Biochemistry and Implications. Atheneum Press Ltd, Gateshead, Tyne and Wear, UK.
Oikonomopoulou, V. P., Krokida, M. K., & Karathanos, V. T. (2011). The influence of freeze drying conditions on microstructural changes of food products. Procedia food science, 1: 647-654.View Article
Overhults, D. G., White, H. E., Hamilton, H. E., and Ross, I. J. (1973). Drying soybeans with heated air. Transactions of American Society of Agricultural Engineers, 16: 112?113.View Article
Ozbek, B. and Dadali, G. (2007). Thin-layer drying characteristics and modelling of mint leaves undergoing microwave treatment. Journal of Food Engineering, 83: 541?549.View Article
Pappas, C., Tsami, E. and Marinos-Kouris, D. (1999). The effect of process conditions on the drying kinetics and rehydration characteristics of some microwave?vacuum dehydration fruits. Drying Technology, 17: 157?174.View Article
Rahman, M. S., Perera, C. O. and Theband, C. (1998). Desorption isotherm and heat pump drying kinetics of peas. Food Research International, 30: 485?491. 00009-XView Article
Remeuf, F., Mohammed, S., Sodini, I. and Tissier, J. P. (2003). Preliminary observations on the effects of milk fortification and heating on microstructure and physical properties of stirred yogurt. International Dairy Journal, 13:773?782. 00092-XView Article
Sarkar, S. and Misra, A. K. (2002). Yoghurt: Nutritional and therapeutic aspects. Indian Journal of Microbiology, 42: 275?287.
Shaker, R. R., Jumah, R. Y., Tashtoush, B. and Zraiy, A. F. (1999). Manufacture of jameed using a spray drying process: a preliminary study. International Journal of Dairy Technology, 52: 77?80.View Article
Sharaf-Elden, Y. I., Blaisdell, J. L. and Hamdy, M. Y. (1980). A model for ear corn drying. Transactions of American Society of Agricultural Engineers, 23: 1261?1265.View Article
Sharma, N. K. and Arora, C. P. (1995). Influence of product thickness, chamber pressure and heating conditions on production rate of freeze-dried yoghurt. International Journal of Refrigeration, 18: 297?307. 00025-7View Article
Singh, R.P. and Heldman, D.R. (2001). Introduction to Food Engineering, third ed. Academic Press, USA.
Sithole R., Mcdaniel, M. R. and Goddik, L. M. (2006). Physicochemical, microbiological, aroma, and flavor profile of selected commercial sweet whey powders. Journal of Food Science, 71: C157-C163.View Article
Soysal, Y., Oztekin, S. and Eren, O. (2006). Microwave drying of parsley: modelling, kinetics, and energy aspects. Biosystems Engineering, 93: 403?413.View Article
Tamime, A. Y. and Robinson, R. K. (2007). Yoghurt Science and Technology. 3rd ed. Cambridge: Woodhead Publishing Limited and CRC Press LLC, England.
Tao, Z., Wu, H., Chen, G. and Deng, H. (2005). Numerical simulation of conjugate heat and mass transfer process within cylindrical porous media with cylindrical dielectric cores in microwave freeze-drying. International Journal of Heat and Mass Transfer, 48: 561?572.??View Article
Venkatesh, M. S. and Raghavan, G. S. V. (2004). An overwiev of microwave processing and dielectric properties of agri-food materials. Biosystems Engineering, 88: 1?18.View Article
Verma, L. R., Bucklin, R. A., Endan, J. B. and Wraten, F. T. (1985). Effects of drying air parameters on rice drying models. Transactions of American Society of Agricultural Engineers, 28: 296?301.View Article
Wam, M. and Tra, M. (1997). Diffusional analysis during air-drying of a starch system, development in chemical engineering. Mineral Proc, 5: 61?77.
Wright, B. J., Zevchak, S. E., Wright, J. M. and Drake, M. A. (2009). The Impact of agglomeration and storage on flavor and flavor stability of whey protein concentrate 80% and whey protein isolate. Journal of Food Science, 74: S17?S29. PMid:19200117View Article PubMed/NCBI
Yaldiz, O., & Ertekin, C. (2001). Thin layer solar drying of some vegetables. Drying Technology, 19: 583?597.View Article
Yongsawatdigul, J. and Gunasekaran, S. (1996). Microwave?vacuum drying of cranberries: Part I: energy use and efficiency. Journal of Food Processing and Preservation, 20: 121?143.View Article