Drying of chilli pepper in various conditions
Main Article Content
Keywords
blanching, drying kinetics, hot air drying, quality parameters, red pepper, sun drying
Abstract
Fresh red pepper was blanched with water (at 90 °C for 3 min), 5% potassium carbonate and 2% ethyl oleate (both at 20 °C for 1 min) and then dried either with forced hot air (at 55, 65 and 75 °C) or solar energy. Then the effects of different variables on the kinetics and quality parameters of dehydrated red chilli pepper were studied. The peppers blanched with boiling water or ethyl oleate and dried at 75 °C had the lowest drying time and their quality indicators (vitamin C, colour values, shrinkage percentage, and rehydration rate) were not significantly different. However, peppers blanched with potassium carbonate and dried at 55 °C had the highest content of this vitamin and also colour scores among different treatments. While the untreated samples (blank) dehydrated either with hot air at 55 °C or solar energy had the lowest shrinkage (%), they did not have significant difference (P<0.01) with the water-blanched samples dried at 65 °C.
References
Arslan, D. and Özcan, 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.
Association of Official Analytical Chemists (AOAC), 1990. Official methods of analysis of AOAC International (17th Ed.). AOAC, Rockville, MD, USA.
Ayub Hossain, M., Wood, J.L. and Kanti Bala, B., 2007. Single-layer drying characteristics and color kinetics of red chili. International Journal of Food Science and Technology 42: 1367-1375.
Bosland, P.W., 1994. Chiles: history, cultivation, and uses. In: Charalambous, G. (ed.). Spices, herbs and edible fungi. Elsevier Science, London, UK, pp. 347-366.
Champion, D., Meste, M.L. and Simatos, D., 2000. Towards an improved understanding of glass transition and relaxations in foods: molecular mobility in the glass transition range. Trends Food Science and Technology 11: 41-55.
Darvishi, H., Rezaie Asl, A., Asghari, A., Azadbakht, M., Najafi, G. and Khodaei, J., 2014. Study of the drying kinetics of pepper. Journal of the Saudi Society of Agricultural Sciences 13: 130-138.
Devahastin, S., Suvarnakuta, P., Soponronnarit, S. and Mujumdar, A.S., 2004. A comparative study of low-pressure superheated steam and vacuum drying of a heat-sensitive material. Drying Technology 22: 1845-18667.
Doymaz, I., 2004. Pretreatment effect on sun-drying of mulberry fruits (Morus alba L.). Food Engineering 65: 205-209.
Doymaz, I., 2007. Air-drying characteristics of tomatoes. Food Engineering 78: 1291-1297.
Doymaz, I., 2010. Effect of citric acid and blanching pre-treatments on drying and rehydration of Amasya red apples. Food and Bioproducts Processing 88: 124-132.
Doymaz, I. and Ismail, O., 2011. Drying characteristics of sweet cherry. Food and Bioproducts Processing 89: 31-38.
Doymaz, I. and Pala, M., 2002. Hot-air drying characteristics of red pepper. Food Engineering 55: 331-335.
Ergunes, G. and Tarhan, S., 2006. Color retention of red peppers by chemical pretreatments during greenhouse and open sun drying. Food Engineering 76: 446-452.
Guiné, R.P.F. and Barroca, M.J., 2012. Effect of drying treatments on texture and color of vegetables (pumpkin and green pepper). Food and Bioproducts Processing 90: 58-63.
Hossain, M.A. and Bala, B.K., 2007. Drying of hot chilli using solar tunnel drier. Solar Energy 81: 85-92.
Isiduro, E., Cotter, D.J., Fernandez, G.C.J. and Southward, G.M., 1995. Color retention in red chile powder as related to delayed harvest. Food Science 60: 1075-1077.
Katekawa M.E. and Silva, M.A., 2007. On the influence of glass transition on shrinkage in convective drying of fruits: a case study of banana drying. Drying Technology 25: 1659-1666.
Kavak Akpinar, E. and Bicer, Y., 2008. Mathematical modelling of thin layer drying process of long green pepper in solar dryer and under open sun. Energy Conversion and Management 49: 1367-1375.
Kaymak-Ertekin, F., 2002. Drying and rehydrating kinetics of green and red peppers. Food Science 67: 168-175.
Mangaraj, S., Singh, A., Samuel, D.V.K. and Singhal, O.P., 2001. Comparative performance evaluation of different drying methods for chillies. Food Science and Technology 38: 296-299.
Marinelli, J., 1998. The Brooklyn botanic garden gardener’s desk reference. Henry Holt and Co, New York, NY, USA.
Mayor, L. and Sereno, A.M., 2004. Modelling shrinkage during convective drying of food materials: a review. Food Engineering 61: 373-386.
Mota, C.L., Luciano, C., Dias, A., Barroca, M.J. and Guiné, R.P.F., 2010. Convective drying of onion: kinetics and nutritional evaluation. Food and Bioproducts Processing 88: 115-123.
Scala, K.D. and Crapiste, G., 2008. Drying kinetics and quality changes during drying of red pepper. LWT-Food Science and Technology 41: 789-795.
Tavakolipour, H. and Mokhtarian, M., 2012. Neural network approaches for prediction of pistachio drying kinetics. International Journal of Food Engineering 8: 3-42.
Tavakolipour, H., Mokhtarian, M. and Kalbasi-Ashtari, A., 2014. Intelligent monitoring of zucchini drying process based on fuzzy expert engine and ANN. Journal of Food Process Engineering 37: 474-481.
Vega-Gálvez, A., Scala, K.D., Rodríguez, K., Lemus-Mondaca, R., Miranda, M., López, J. and Perez-Won, M., 2009. Effect of air-drying temperature on Physico-chemical properties, antioxidant capacity, colour and total phenolic content of red pepper (Capsicum annuum, L. var. Hungarian). Food Chemistry 117: 647-653.
Zhao, D., Zhao, C., Tao, H., An, K., Ding, S. and Wang, Z., 2013. The effect of osmosis pretreatment on hot-air drying and microwave drying characteristics of chili (Capsicum annuum L.) flesh. International Journal of Food Science and Technology 48: 1589-1595.
Zhu, J.F., Liu, J.Z., Wu, J.H., Cheng, J., Zhou, J.H. and Cen, K.F., 2015. Thin-layer drying characteristics and modeling of Ximeng lignite under microwave irradiation. Fuel Processing Technology 130: 62-70.
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