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ORCID iD iconhttps://orcid.org/0000-0002-3006-8220

نوع مقاله: مقاله کامل پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد، گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه تربیت مدرس

2 دانشیار گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه تربیت مدرس

چکیده

در مطالعه‌ی حاضر، کینتیک خشک شدن ماست بدون چربی با ضخامت 2/2 میلی متر در توان های 35، 130 و 260 وات و فشارهای مطلق 60، 200، 400، 600 و 800 میلی بار در خشک کن مایکروویو- خلاء مورد ارزیابی قرار گرفت. همچنین برای انتخاب مناسب‌ترین مدل، میزان برازش داده های بدست آمده با 12 مدل تجربی و نیمه تجربی اندازه‌گیری شد. براساس یافته‌های این بررسی، توان مایکروویو تاثیر بسزایی در زمان خشک شدن داشت به طوری که با افزایش توان مایکروویو زمان خشک شدن از 90 دقیقه به 15 دقیقه کاهش یافت. اما کاهش فشار مطلق سامانه تاثیری در زمان خشک ‌شدن نداشت. در میان مدل های برازش شده نیز دو مدل لوجیستیک و میدیلی و همکاران به دلیل دارا بودن بالاترین R2 و کمترین  RMSE به عنوان مناسب ترین مدل ها انتخاب شدند. در ضمن، با افزایش توان مایکروویو، ضریب نفوذ موثر از 10-10×4/42 تا 9-10×2/83 افزایش یافت در حالی که فشار روی این عامل بی تاثیر بود. انرژی فعال سازی هم با استفاده از معادله اصلاح شده آرنیوس محاسبه شد.

کلیدواژه‌ها

Abbasi, S., & Azari, S. 2009. Novel microwave-freeze drying of onion slices. International Journal of Food Science & Technology, 44: 974–979.

Akpinar, E. K. 2006. Determination of suitable thin layer drying curve model for some vegetables and fruits. Journal of Food Engineering, 73:75–84.

Altan, A., & Maskan, M. 2005. Microwave assisted drying of short-cut (ditalini) macaroni: Drying characteristics and effect of drying processes on starch properties. Food Research International, 38: 787–796.

AOAC 1999. Official Methods for Analysis, 15th ed. (Vol. II). Arlington, VA: Association of Official Analytical Chemists.

Bondaruk, J., Markowski, M. & Blaszczak, W. 2007. Effect of drying conditions on the quality of vacuum–microwave dried potato cubes. Journal of Food Engineering, 81: 306–312.

Chandra P. K. & 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. & Sun, D. W. 2004. Microwave–vacuum drying kinetics of carrot slices. Journal of Food Engineering, 65: 157–164.

Dadali, G., Apar, D. K. & Ozbek, B. 2007. Microwave drying kinetics of okra. Drying Technology, 25: 925–936.

Doymaz, I. 2005. Influence of pretreatment solution on the drying of sour cherry. Journal of Food Engineering, 78: 591–596.

Drouzas, A. E. & Schubert, H. 1996. Microwave application in vacuum drying of fruits. Journal of Food Engineering, 28: 203–209.

Farnworth, E. 2008. Handbook of Fermented Functional Foods. 2nd ed. CRC Press: New York, USA.

Hamann, W.T. & Marth, E. H. 1984. Survival of Streptococcus thermophilus and Lactobacillus bulgaricus in commercial and experimental yogurts. Journal of Food Protection, 47: 781–786.

Hayaloglu, A. A., Karabulut, I., Alpaslan M. & Kelbaliyev, G. 2007. Mathematical modeling of drying characteristics of strained yoghurt in a convective type tray-dryer. Journal of Food Engineering, 78: 109–117.

Henderson, S. M. & Pabis, S. 1961. Grain drying theory I: temperature effect on drying coefficient. Journal of Agriculture Research Engineering, 6: 169–174.

Kaensup, W., Chutima, S. & Wongwises, S. 2002. Experimental study on drying of chilli in a combined microwave–vacuum-rotary drum dryers. Drying Technology, 20: 2067–2079.

Karathanos, V. T. 1999. Determination of water content of dried fruits by drying kinetics. Journal of Food Engineering, 39: 337–344.

Kiranoudis, C. T., Tsami, E. & Maroulis, Z. B. 1997. Microwave vacuum drying kinetics of some fruits. Drying Technology, 15: 2421–2440.

Krokida, M. K., Maroulis, Z. B. & Saravacos, G. D. 2001. The effect of the method of drying on the colour of dehydrated products. International Journal of Food Science and Technology, 36: 53–59.

Kumar, P. & Mishra, H. N. 2004. Yoghurt powder-A review of process technology, storage and utilization. Food and Bioproducts Processing, 82(C2): 133–142.

Kurda, T. & Mujumdar, A. S. 2009. Advanced Drying Technologies. Second Edition. CRC press, Boca Raton, USA.

Lewis, W. K. 1921. The rate of drying of solid materials. Journal of Industrial Engineering, 13: 427–443.

Li, Y., Xu, S.Y. & Sun, D.W. 2007. Preparation of garlic powder with high allicin content by using combined microwave-vacuum and vacuum drying as well as microencapsulation. Journal of Food Engineering, 83:76–83.

Lin, T. M., Durance, T. D. & Scaman, C. H. 1999. Physical and sensory properties of vacuum microwave dehydrated shrimp. Journal of Aquatic Food Product Technology, 8: 41–53.

Maskan, M. 2000. Microwave/air and microwave finish drying of banana. Journal of Food Engineering, 44(2): 71–78.

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.

Overhults, D. G., White, H. E., Hamilton, H. E. & Ross, I. J. 1973. Drying soybeans with heated air. Transactions of American Society of Agricultural Engineers, 16: 112–113.

Ozbek, B. & Dadali, G. 2007. Thin-layer drying characteristics and modelling of mint leaves undergoing microwave treatment. Journal of Food Engineering, 83:541–549.

Panchariya, P. C., Popovic, P. C. & Sharma, A. L. 2002. Thin-layer modelling of black tea drying process. Journal of Food Engineering, 52: 349–357.

Rahman, M. S., Perera, C. O. & Theband, C. 1998. Desorption isotherm and heat pump drying kinetics of peas. Food Research International, 30: 485–491.

Sarkar, S. & Misra, A. K. 2002. Yoghurt: Nutritional and therapeutic aspects. Indian Journal of Microbiology, 42: 275–287.

Sharaf-Elden, Y. I., Blaisdell, J. L. & Hamdy, M. Y. 1980. A model for ear corn drying. Transactions of American Society of Agricultural Engineers, 23: 1261–1265.

Sharma, G. P., & Prasad, S. 2005. Optimization of process parameters for microwave drying of garlic cloves. Journal of Food Engineering, 75(4): 441–446.

Sharma, N. K. & Arora, C. P. 1995. Influence of product thickness, chamber and heating conditions on production rate of freeze-dried yoghurt. International Journal of Refrigeration, 18: 297–307.

Soysal, Y., Oztekin, S. & Eren O. 2006. Microwave drying of parsley: Modelling, kinetics, and energy aspects. Biosystems Engineering, 93: 403–413.

Tamime, A. Y. & Robinson, R. K. 2007. Yoghurt Science and Technology. 3rd ed. Cambridge: Woodhead Publishing Limited and CRC Press LLC, England.

Verma, L. R., Bucklin, R. A., Endan, J. B. & Wraten, F. T. 1985. Effects of drying air parameters on rice drying models. Transactions of American Society of Agricultural Engineers, 28: 296–301.

Wang, Z., Sun, J., Liao, X., Chen F., Zhao, G., Wu, J. & Hu, X. 2007. Mathematical modeling on hot air drying of thin layer apple pomace. Food Research International, 40: 39–46.

Yaldiz, O. & Ertekin, C. 2001. Thin layer solar drying of some vegetables. Drying Technology, 19: 583–597.

Yongsawatdigul J. & Gunasekaran, S. 1996. Microwave–vacuum drying of cranberries: Part I: energy use and efficiency. Journal of Food Processing and Preservation, 20: 121–143.