DRYING OF EGGPLANT SLICES USING MICROWAVE-OVEN | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 10, Volume 35, Issue 4, October 2018, Page 1345-1364 PDF (760.17 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2018.95286 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. H. Keshek1; M. N. Omar1; A. H. Amer Eissa2 | ||||
| 1Lecturer, Agricultural Engineering Department, Menoufia University, Egypt | ||||
| 2Professor of Food Processing Engineering, Agricultural Engineering Department, Menoufia University, Egypt | ||||
| Abstract | ||||
| Eggplant (Solanum melongena L.) is considered one of the most important crops in summer season, and it is grown in most cultivated area in Egypt. Eggplant has a very limited shelf life for freshness and physiological changes occur after harvest. Nowadays, microwave drying offers an alternative way to drying agricultural products. Microwave drying is not only faster but also requiring less energy consumption than conventional drying. The main objective of this research was to evaluate using the microwave oven in Eggplant drying, to determine the optimum drying time of higher drying efficiency and lower energy consumption. The eggplants slices, having a thickness of about 5, 10, 15, and 20 mm, with diameter 50±2 mm was dried using microwave oven (KOR-9G2B) using three different levels were 450, 630, and 810 Watt (50%, 70%, and 90% of 900 Watt). The results show that, the initial moisture content of the eggplant slices was around 93 % wet basis (13.28 g water/g dry matter). The results indicated that, the moisture transfer within the sample was more rapidly during higher microwave power heating (810 watt) and lower thickness (5 mm) of the eggplant slices. In addition, the results show that, the drying efficiency increases by increasing slices thickness at power levels 450, 630 and 810 Watt. The higher drying efficiency was 83.13% occurred when drying the eggplant slices 20 mm thickness in microwave oven at power 630 Watt. the higher total energy consumption per dry kilogram was 1.275 (kWh/ dry kg) occurred at used microwave 810 Watt for drying eggplant slices 5 mm thickness, and the lower total energy consumption per dry kilogram was 0.55 (kWh/ dry kg) occurred at used microwave 810 Watt for drying eggplant slices 20 mm thickness. | ||||
| Keywords | ||||
| Microwave drying; Eggplant; Drying rate; Drying efficiency; Energy consumption | ||||
| References | ||||
|
Akpinar, E.K. and Bicer, Y. (2005) Modeling of the drying of eggplants in thin-layers. International Journal of Food Science and Technology, 40, 273-281. AOAC, (1980). Official methods of analysis (13th Ed.). Association of official analytical chemists, Washington, D.C.
Arikan, M. F., Arikan, Z., Soysal, Y., & Esturk, O. (2012) Drying characteristics and quality parameters of microwave-dried grated carrots. Food and Bioprocess Technology, 5, 3217–3229.
Arslan D., and Ozcan M.M. (2011) Dehydration of red bell pepper (Capsicum annuum L.): Change in drying behavior, colour and antioxidant content. Food and Bioproducts Processing, 89: 504–513.
Aydogdu, A. (2014) Microwave-infrared combination drying of eggplants. Master of Science in Food Engineering Department, Middle East Technical University. Turkey.
Berk, Z. (2009) Dehydration. In Z. Berk, Food Process Engineering and Technology (pp. 459–510). Amsterdam: Academic Press.
Botha G.E., Oliveira J.C., Ahrne L. (2012) Quality optimization of combined osmotic dehydration and microwave assisted air-drying of pineapple using constant power emission. Food and Bioproducts Processing, 90: 171–179.
Chong, C. H., Figiel, A., Law, C. L., and Wojdyło, A. (2014) Combined drying of apple cubes by using of heat pump, vacuum-microwave, and intermittent techniques. Food and Bioprocess Technology, 7, 975–989.
Doymaz, İ. (2011) Drying of eggplant slices in thin layers at different air temperatures. Journal of Food Processing and Preservation, 35:280-289.
Ertekin, C., and Yaldiz, O. (2004) Drying of eggplant and selection of a suitable thin layer-drying model. Journal of Food Engineering, 63, 349–359.
FAO. (2015) Production/Crops for Eggplant in 2013. Food and Agriculture Organization of the United Nations, Statistics Division.
Giri, S. K., P.P. Sutar and Suresh Prasad (2014) Effect of process variables on energy efficiency in microwave-vacuum drying of button mushroom. Journal of Food Research and Technology 2 (1): 31-38.
Harish A, Vivek B S, Sushma R, Monisha J, and Krishna Murthy T P, (2014) Effect of Microwave Power and Sample Thickness on Microwave Drying Kinetics Elephant Foot Yam (Amorphophallus Paeoniifolius) American Journal of Food Science and Technology, Vol. 2, No. 1, 28-35.
Henderson S M (1974) Progress in developing the thin-layer drying equation. Transactions of the ASAE, 17, 1167–1168/ 1172.
Henderson S M; Pabis S (1961) Grain drying theory I: temperature effect on drying coefficient. Journal of Agricultural Research Engineering, 6, 169–174.
Ibrahim, M., K. Sopian and W.R.W. Daud., (2009) Study of the drying kinetics of lemon grass. American Journal 0f Applied Sciences 6 (6):1070-1075.
Jangam, S. V. (2011) An overview of recent developments and some r&d challenges related to drying of foods. Drying Technology, 29: 1343-1357.
Khodabakhshi, A., Mandana, M., and Zarein, M., (2015) Investigation of Microwave Power Effects on Drying Kinetics and Energy Efficiency of Banana Samples. Global Journal of Science Frontier Research: D Agriculture and Veterinary Volume 15 Issue 4 Version 1.0.
Margaris, D. P., and Ghiaus, A.G. (2008) Fruits and vegetables dehydration in tray dryers. In A. Urwaye, New Food Engineering Research Trends (pp. 45-101). New York: Nova Science Publishers Inc.
Midilli A; Kucuk H; Yapar Z (2002) A new model for single layer drying. Drying Technology, 20(7), 1503–1513.
Mohamed, L. A.; M. Kouhila; A. Jamali; S. Lahsasni; N. Kechaou; and M. Mahrouz (2005) Single layer solar drying behavior of Citrus aurantium leaves under forced convection. Energy Conversion and Management, 46:1473–1483.
Mohamed, M. A.; G. R. Gamea; and M. H. Keshek (2010) "Drying characteristics of okra by different solar dryers". Misr J. Ag. Eng. Vol. 27(1):294 – 312.
Murthy, T. P., and Manohar, B. (2012) Microwave drying of mango ginger (Curcuma amada Roxb): prediction of drying kinetics by mathematical modelling and artificial neural network. International Journal of Food Science and Technology, 47, 1229–1236.
Page, G (1949) Factors influencing the maximum rates of air-drying shelled corn in thin layers. MSc Thesis, Purdue University, Indiana, USA.
Puig A., Perez-Munuera I., Carcel J.A., Hernando I., and Garcia Perez J.V. (2012) Moisture loss kinetics and microstructural changes in eggplant (Solanum melongena L.) during conventional and ultrasonically assisted convective drying. Food and Bioproducts Processing, 90: 624–632.
Rakha, M.K.A (2014) growth, yield and fruit quality of eggplant (solanum melongena l.) as affected by irrigation intervals and foliar application of some antitranspirants. J. Plant Production, Mansoura Univ., Vol. 5(12): 2069 2083.
Schiffmann, R. F. (2001) Microwave Processes for the Food Industry. In A. K. Datta, & R. C. Anantheswaran (Eds.), Handbook of Microwave Technology for Food Applications (pp. 299–338). New York: Marcel Dekker.
Sharma G.P. and Prasad S. 2006. Specific energy consumption in microwave drying of garlic cloves. Enerji 31: 1921-1926.
Sorour, H.; and El-Mesery . H. (2014) Effect of microwave and infrared radiation on drying of onion slices. International Journal of Research in Applied, Natural and Social Sciences (IMPACT: IJRANSS) Vol. 2, Issue 5, May 2014, 119-130.
Sousa, W. A., Marsaioli Jr, A. and Rodrigues, M.I. (2004) Optimizing a microwave assisted banana-drying process. In: Silva, M.A. & Rocha, S.C.S. (Eds.), Proceedings of the 14th International Drying Symposium. Sa˜o Paulo, Brazil, Vol. C, 1938–1945.
Soysal, Y., Oztekin, S., Eren, O., (2006) Microwave drying of parsley: modelling, kinetics, and energy aspects. Biosystems Engineering 93 (4), 403–413
Togrul, T. and Pehlivan, D. (2003) Modeling of drying kinetics of single apricot. Journal of Food Engineering, 58, 23-32. doi:10.1016/S0260-8774(02)003291. Verma L R; Bucklin R A; Endan J B; Wratten F T (1985) Effects of drying air parameters on rice drying models. Transactions of the ASAE, 28, 296–301. Wang C.Y; Singh R.P (1978) A single layer drying equation for rough rice. ASAE Paper No: 78-3001, ASAE, St. Joseph,MI. Wu L., Orikasa T., Ogawa Y., and Tagawa A. (2007). Vacuum drying characteristics of eggplants. Journal of Food Engineering, Vol. 83, p. 422–429.
Yaldız O; Ertekin C (2001) Thin layer solar drying of some different vegetables. Drying Technology, 19(3), 583–596.
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. | ||||
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