CREEP BEHAVIOR OF POTATO TUBERS DURING STORAGE

Soliman, Soliman N.; El-Sayed, Azhar E.

doi:10.21608/mjae.2017.97500

CREEP BEHAVIOR OF POTATO TUBERS DURING STORAGE

Document Type : Original Article

Authors

¹ Prof. of Food Eng., Fac. of Ag., Alexandria Univ. Egypt.

² Res., Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt.

10.21608/mjae.2017.97500

Abstract

The aim of this investigation is to study the creep behavior of Lady Rosetta potato tuber variety of sand and black soil cultivarsunder different storage treatments. The fresh harvested tubers tend to be very brittle. Four creep apparatuses were develop using a digital micrometer, which enable to feed the data into the computer and instantaneous reading of deformation with time at constant stress (62.45 kPa) during a duration time of 60 minutes. The creep curves were analyzed and the constants related to Burger rheological models were determined. For fresh potato tubers, all rheological model constants were slightly increased with tuber mass, rheological model constants of black soil cultivar were larger than that for sand soil cultivar. The time of retardation of the rheological model was found to be constant around 621 ± 5 seconds for each of sand and black soil cultivars.

Main Subjects

Processing Engineering of Agricultural Products

References

Burton WG.(1989). Post-harvest physiology. In: WG BURTON. Ed. The Potato, 3^rd edition. Longman Singapore Publishers (Pte) Ltd, Singapore.423 -522.

Ashis Datta and C.T. Morrow .(1983). Graphical and Computational analysis of creep curves. Trans. of the ASAE 26 :( 3) 1870-1874.

McLaughlin, N. B. and R. E. Pitt (1984).Failure characteristics of apple tissue under cyclic loading. Trans. Am. Soc. Agr. Eng. 27, 311-320.

Mohsenin, N.N. (1986). Physical Properties of Plant and Animal Materials. Gordon and Breach Science Publishes. New York, USA.

NPC, (Journal of National Potato Council), Jul 2016, Washington, D.C., USA).

Sabbah, M. A.;Soliman, S. N. and Abdel- Maksoud, M. A. (1994) Creep properties of Tomatoes and their dependence on maturity. Misr J. Ag. Eng., 11,1,280-299.

Pitt, R.E. (1989). Viscoelastic properties of fruits and vegetables. In Viscoelastic Properties of Solid, Fluid, and Semisolid Foods (M. A. Rao. ed.) Elsevier, Essex. U.K. (to appear).