DIELECTRIC PROPERTIES OF POTATO TUBERS RELATED TO STORAGE CONDITIONS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 40, Volume 34, Issue 4, October 2017, Page 2233-2250 PDF (1.06 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2017.97488 | ||||
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| Authors | ||||
| Soliman N. Soliman1; Azhar E. El-Sayed2 | ||||
| 1Prof. of Food Eng., Fac. of Ag., Alexandria Univ., Egypt. | ||||
| 2Res., Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| The objective of this work is to study the dielectric properties of potato tubers asa criteria for predicting of freshnessfor each of fresh and storage commodity under traditional (Nawala) and cold conditions. Dielectric measurementswere measured using LCZ meter,andwere conducted on fresh and stored tubers, for measuring of capacitance (Farad, f), and conductance (Siemens, S) over a range of frequencies from 10 to 1000 kHz. The measured value were used to calculate permittivity (f/m), conductivity (S/m), relative permittivity, complex permittivity (S.sec/f), complex conductivity (f/m.sec) and dissipation factor or "loss tangent" (tan δ) of potato tuber. The capacitance,relative permittivitydecreases rapidly with increasing frequency.Dissipation factor Tan (δ) decreases gradually with increasing the storage time. Complex permittivity and Complex conductivity were decreases with the increases of the storage time. The quality factor Q was expressed as a percentage value of the ratio between conductance at high frequency to that at low frequency (GH/GL) for the stored tissue to that for the fresh tissue to indicate the degree of freshness. The quality factor Q decreases with the increasing ofstorage time, storage temperature and storage load stressand isa fairly goodindication of the loss of freshness. The storage ages of potatoes were predictedwith very sensitive equation using the quality factor, tuber weight and storage temperature. | ||||
| References | ||||
|
Asami K, Y. Takahashi and S. Takashima, (1989).Dielectric properties of mouse lymphocytes and erythrocytes .Biochimica et Biophysica Acta, 1010:49-55.
Babbitt J., (1981). Measuring free fish quality. Mar.Fish.Rev.43, 28.
Joseph D and D. Bronzino, (1995). The biomedical engineering hand book. CRC press, Inc IEEE press, 1385-1393.
Irimajiri A., K. Asami, T. Ichinowatari, and Y. Kinoshita, (1987). Passive electrical properties of the membrane and cytoplasm of cultured rat basophil leuemia cells, 1. Dielectric behavior of cell suspensions in 0.01-500 MHz and its simulation with a single shell model" Biiochimicaet Biophysica Acta, 896,203-213.
Mohsenin, N.N. (1986). Physical Properties of Plant and Animal Materials. Gordon and Breach Science Publishes. New York, USA.
Nelson S.O, and A.K. Datta. (2001). Dielectric properties of food material and electric field interactions. In Datta AK. Anantheswaran RC, editors. Handbook of Microwave technology for food applications. New York: Marcel Dekker Inc. P69-114.
Nelson S.O. W.R. Forbus, and K.C. Lawrence, (1995). Assessment of microwave permittivity for sensing peach maturity, Trans. of ASAE, 38: (2), 579-585.
Polk, C. and E. Postow, (1996). Hand book of biological effects of electromagnetic fields. second edition, CRC press, Inc. New York.
Sakaguchi, M. and A. Koike.(1992). Freshness assessment of fish fillets using the torrymeter and K-value.(Huss H.H. et al, (eds.)),Quality Assurance in the Fish Industry, Elsevier Science publishers. B.V 333-339.
Saltiel, C. and AK.Datta, (1999). Heat and mass transfer in microwave processing. Adv Heat Transfer 33:1-94. | ||||
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