EFFECT OF TEMPERATURES ON THE DRYING BEHAVIORS AND QUALITY OF CITRUS PEELS

Document Type : Original Article

Authors

1 Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt.

2 Food Tech. Department, Fac. of Agric., Kafrelsheikh Univ. Egypt.

Abstract

The changes in citrus peels (CP) moisture content, drying rate, moisture ratio, drying time and energy consumption at various drying air temperatures was studied. The effect of drying temperatures and residual moisture contents on the quality of CP after drying was also evaluated. The test samples were dried in a laboratory scale hot air dryer at air temperature in the range of 40–70oC and a constant air velocity of 1m/s to desired moisture for save storage and final moisture level of drying conditions. Cakes prepared from blendes containing different proportion (0, 10, 15 and 20%) of dried orange and mandarin peels were also evaluated for chemical composition and sensory attributes. The results indicated that, the drying temperature was very effective in removing moisture from citrus peels. The drying time was decreased by 50% and specific energy consumption decreased by about 28.5% with increasing drying temperature from 40 to70oC for drying citrus peels. The simple exponential equation satisfactorily described the drying behavior of CP as indicated by the higher coefficient of determination.The optimal drying temperature was 60°C to reach 10±0.2%, w.b, moisture level, which reduced drying time and saved energy consumption and product quality. Meanwhile, overdrying to reach final moisture levels of citrus peels (5.4±0.2%)with higher drying air temperature sharply increased the losses of vitamin C, carotenoids and essential oils. Incorporation 15% of dried orange and mandarin peels in cakes formula increased dietary fiber by 33.5 and 29.6%, ether extract by 2.9 and 4.6% and ash by 30.6 and 29.0%, respectively, while protein and total carbohydrates contents were slightly decreased. Highly acceptable cakes could be obtained by incorporating 15% of orange and mandarin peels dried to 10%, w.b., moisture content in the cakes formulation and it can be used as value-added food ingredients.

Main Subjects

References

Abdel-Hady, Marwa, M. A. (2013). Utilization of food processing wastes in fortification of some foods and producing some biological compounds.M. Sc Thesis, Food sci. and Technol. Dept. Fac. of Agric. Kafrelsheikh Univ., Egypt.
A.O.A.C., (2005).  Association of Official Analytical Chemists. Official Methods of Analysis of the Association of Official Analytical Chemists. Washington, USA.
Arora S. and S. McFarlane (2005). The case for low carbohydrate diets in diabetes management. Nutrition and Metabolism, 2:16.
Bilgicli, N., S. Ibanoglu and E.N. Herken (2007). Effect of dietary fiber addition on the selected nutritional properties of cookies. J. Food Eng., 78: 86-89.
Block, G. (1991). Vitamin C and Cancer Prevention: The Epidemiologic Evidence., Am. J. Clin. Nutr. 53:270-282.
Di Majo D., M. Giammanco, M. La Guardia, E. Tripoli, S.  Giammancoand and E. Finotti (2005). Flavanones in Citrus fruit: Structure-antioxidant activity relationships. Food Res. Intern., 38: 1161-1166.
Djilas J.S. and  C.B. Gordana (2009). By-products of fruits processing as a source of phytochemicals. Engineering Quarterly, 15(4):191−202.
Doymaz, I. (2006). Thin-layer drying behavior of mint leaves. Journal of Food Engineering, (74): 370-375.
Duncan, D. B. (1995). Multiple range tests and multiple F test. Biometrics, 11: 1-42.
Garau, M.C., S. Simal, C. Rosselloó and A. Femenia (2007). Effect of air-drying temperature on physico-chemical properties of dietary fibre and antioxidant capacity of orange (Citrus aurantium v. Canoneta) byproducts. Food Chem., 104: 1014-1024.
Hanneman, L. J. (1984). Cake decoration in bakery powder confectionery, published by Heineman, London.
Inchuen S., W. Narkrugsa1 and P. ornchaloempong (2010). Effect of Drying Methods on Chemical Composition, Color and Antioxidant Properties of Thai Red Curry Powder. Kasetsart J. (Nat. Sci.) 44 : 142 – 151.
Jayaprakasha G.K. and B.S. Patil (2007). In vitro evaluation of the antioxidant activities in fruit extracts from citron and blood orange. Food Chem., 101: 410-418.
Javed A., H. Abid and A. Hussain (2010). Study on some macronutrients composition in peels of different citrus fruits grown in NWFP (Pakistan).J. Chem. Soc. Pak., 32(1): 83-86.
Jeong, S. M., S.Y. Kim, D.R. Kim, S.C. Jo, K. C. Nam, D.U. Ahn and S.C. Lee (2004). Effect of heat treatment on the antioxidant activity of extracts from citrus peels. J. Agri. Food Chem., 52: 3389-3393.
Kaya, A., Aydin, O., Demirtas, C. and M. Akgün, (2007).  An experimental study on the drying kinetics of quince. Desalination 212: 328-343.
Kong, K. W.; Khoo, H. E.; Prasad, K. N.; Ismail, A.; Tan, C. P.  and Rajab, N. F. (2010). Revealing the Power of the Natural Red Pigment Lycopene.  Molecules, 15(2): 959-987.
Kouhila, M., Kechaou, N., Otmani, M., Fliyou, M. and , S. Lahsasni (2002). Experimental study of sorption isotherms and drying kinetics of Moroccan Eucalyptus Globulus. Drying Technology 20(10): 2027-2039.
Lewicki, P. P. (2006). Design of hot air drying for better foods. Trends in Food Science and Technology, 17: 153-163.
Marin, F.R., C.R. Soler, G.O. Benavente, J. Castillo and A.J.A. Perez (2007). By-products from different citrus processes as a source of customized functional fibers. Food Chem., (100): 736-741.
Megahed, M. Y. (1985). Studies on composition and antimicrobial effect of carrot carotenes. J. of Food Sci., 60(5):1048-1053.
Mortensen, A. (2006). Carotenoids and other pigments as natural colorants.  Pure Appl. Chemistry, 78(8): 1477–1491.
Müller,J.,(2004). Drying of MAP. Teaching material. University Stuttgart-Hohenheim, Institute for Agricultural Engineering, Stuttgart.
Muller J.  and A. Heindl (2006). Drying of medicinal plants. R.j. Bogers, l.e. Craker and d. Lange (eds.), medicinal and aromatic plants: 237-252.
Nassar, A.G.,  A.A. Abdel-Hamied and E.A. El-Naggar (2008). Effect of citrus by-products flour incorporation on chemical, rheological and organolepic characteristics of biscuits. World Journal of Agricultural Sciences, 4(5): 612-616.
Nimmol, C., S. Devahastin, T. Swasdisevi, and S. Soponronnarit         (2007). Drying of banana slices using combined low-pressure superheated steam and far-infrared radiation. Journal of Food Engineering, 81: 624-633.
Sacilik, K., R. Keskin and A.K. Elicin, (2005). Mathematical modeling of solar tunnel drying of thin layer organic tomato. Journal of Food Engineering, 25(1):15-25.
Saeed, I.E. ; K. Sopian and Z. Z. Abidin (2008). Thin-Layer Drying of Roselle (I): Mathematical and Drying Experiments. Agricultural Engineering International: the CIGR Ejournal:1-25.
Sharma, G.P., R.C. Verma and S.V. Pathare (2005). Mathematical modeling of infrared radiation thin layer drying of onion slices. Journal of Food Engineering, 71(3): 282-286.
Shoughy, M. I., A. A. FL-Keway, and Y. T. Hendawy (2011). Rice bran pellets production by using expeller machine. Misr J. Ag. Eng., 28(4): 975-998.
Soysal Y. and S. Oztekin (2001). Technical and Economical performance of a tray dryer for medicinal and aromatic plants. J. Agric. Eng. Res., 79(1): 73-79.
Watts, B. M., Ylimaki, G. L., Jeffery, L. E., and Elias, L. G. (1989). Basic Sensory Methods for Food Evaluation. IDRC, Ottawa, Ontario, Canada, pp 66-78.
Wiriyaumpaiwong, S. and  L. Wiset (2008). Thin layer drying equation and the changes in color of celery under different drying temperatures. Agricultural Sci. J., 39(3): 323-326.

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