MICROWAVE DRYING CHARACTERISTICS FOR GINGER ROOT (Zingiber officinale) | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 20, Volume 32, Issue 2, April 2015, Page 739-754 PDF (941.78 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2015.98632 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| A. T. Taha | ||||
| Agricultural Engineering Department, Faculty of Agric., Menoufia University, Egypt. | ||||
| Abstract | ||||
| This experiment was carried out at Agricultural Engineering DepartmentMinofiya University to study microwave drying characteristics for ginger root. Five microwave drying powers (180, 360, 540, 720 and 900 Watt) and four levels of ginger thickness (0.5, 1, 1.5 and 2 cm) were used. Drying characteristics and quality aspects of the dried ginger were studied. The drying time to achieve the save storage moisture content was 14 minutes at 900 Watt with 0.5cm thickness. Total phenolic content of fresh ginger was 0.40 mg/g.d.m. and the highest phenol content in dried ginger was detected at the 900 Watt power with 1.5cm thickness, and the lowest phenolic value was recorded at 180 Watt with 2 cm thickness. The fresh ginger hardness ranged from 0.5 to 1 kg /cm2 and the highest hardness of dried ginger was 6 kg /cm2 at both 720 and 900 W with all thickness. The highest drying efficiency of ginger slices was 78% at 720 and 900 Watt with 2 cm thickness and the lowest efficiency (less than 10%) was recorded at 180 Watt with all used thicknesses (except at 2 cm. thickness). The highest value of energy consumption (10.2 MJ) was detected at 180 Watt and 2 cm thickness, while drying at 900 Watt with both 0.5 and 1 cm. thickness represent the lowest energy consumption (1.13 MJ). Veirma model can be used to describe the behavior of microwave drying of ginger, which gave the best results. Key word: microwave, drying, ginger, thickness | ||||
| References | ||||
|
Chan, E. W. C., Lim, Y. Y., Wong, L. F., Lianto, F. S., Wong, S. K., Lim, K. K., (2008).Antioxidant and tyrosinase inhibition properties of leaves and rhizomes of ginger species. Food Chemistry, 109, 477–483.
El-Awady, M. N., Mohamed, S. A., El-Sayed, A. S. and Hassanain, A. A. (1993).Utilization of solar energy for drying processes of agricultural products. Misr, J. Ag. Eng., 10(4):794-804.
Ertekin, C. and Yaldiz, O. (2004). Drying of eggplant and selection of a suitable hin layer-drying model. Journal of Food Engineering;(53): 349–359.
Idlimam, A.; Ethmane Kane, C. S. and Kouhila, M. (2007). Single layer drying behaviour of grenade peel in a forced convective solar dryer .Revue des Energies Renouvelables , 10 (2): 191 – 203.
Li, Z., Raghavan, G.S.V., Wang, N., (2010) Apple volatiles monitoring and control in microwave drying. LWT-Food Science and Technology 43, 684–689.
Rahman H., R. Karuppaiyan, K. Kishor, and R. Denzongpa, (2009).“Traditional practices of ginger cultivation in north east India,”Indian Journal of Traditional Knowledge, vol. 8, no. 1, pp. 23–28,.
Saeedeh A and Asna U (2007).Antioxidant properties of various solvent extracts of mulberry (Morusindica L.) leaves. Food Chem 102:1233–1240.
Shirin Adel P. R.* and Jamuna Prakash (2010). Chemical composition and antioxidant properties of ginger root (Zingiber officinale). Journal of Medicinal Plants Research Vol. 4(24), pp. 2674-2679
Torringa E; Esveld E; Scheewe I; van den Berg R; Bartels P (2001) Osmotic dehydration as a pre-treatment before combined microwave–hot-air drying of mushrooms. Journal of Food Engineering, 49, 185–191.
Zhang, M., Tang, J., Mujumdar, A.S., Wang, S., 2006. Trends in microwave-related drying of fruits and vegetables. Trends in Food and Technology 17, 524–534. | ||||
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