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Study of Structural Changes of Pumpkin Tissue before and after Mechanical Loading

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Abstract:

The texture of agricultural crops changes during harvesting, post harvesting and processing stages due to different loading processes. There are different source of loading that deform agricultural crop tissues and these include impact, compression, and tension. Scanning Electron Microscope (SEM) method is a common way of analysing cellular changes of materials before and after these loading operations. This paper examines the structural changes of pumpkin peel and flesh tissues under mechanical loading. Compression and indentation tests were performed on peel and flesh samples. Samples structure were then fixed and dehydrated in order to capture the cellular changes under SEM. The results were compared with the images of normal peel and flesh tissues. The findings suggest that normal flesh tissue had bigger size cells, while the cellular arrangement of peel was smaller. Structural damage was clearly observed in tissue structure after compression and indentation. However, the damages that resulted from the flat end indenter was much more severe than that from the spherical end indenter and compression test. An integrated deformed tissue layer was observed in compressed tissue, while the indentation tests shaped a deformed area under the indenter and left the rest of the tissue unharmed. There was an obvious broken layer of cells on the walls of the hole after the flat end indentations, whereas the spherical indenter created a squashed layer all around the hole. Furthermore, the influence of loading was lower on peel samples in comparison with the flesh samples. The experiments have shown that the rate of damage on tissue under constant rate of loading is highly dependent on the shape of equipment. This fact and observed structural changes after loading underline the significance of deigning postharvesting equipments to reduce the rate of damage on agricultural crop tissues.

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Periodical:

Applied Mechanics and Materials (Volumes 333-335)

Pages:

1998-2003

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.333-335.1998

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Online since:

July 2013

Authors:

Maryam Shirmohammadi*, Prasad Yarlagadda

Keywords:

Cellular Structure, Compression Test, Indentation Test, Postharvesting Loss, Scanning Electron Microscope (SEM)

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] F. A. O. o. t. U. Nations, Prevention of post-harvest food losses: fruits, vegetables, and root crops : a training manual: Food and Agriculture Organization of the United Nations, (1989).

Google Scholar

[2] F. R. Harker, et al., Texture of parenchymatous plant tissue: a comparison between tensile and other instrumental and sensory measurements of tissue strength and juiciness, Postharvest Biology and Technology, vol. 11, pp.63-72, (1997).

DOI: 10.1016/s0925-5214(97)00018-5

Google Scholar

[3] F. Harker and I. Hallett, Physiological changes associated with development of mealiness of apple fruit during cool storage, HortScience, vol. 27, pp.1291-1294, (1992).

DOI: 10.21273/hortsci.27.12.1291

Google Scholar

[4] N. De Belie, et al., Influence of ripening and turgor on the tensile properties of pears: A microscopic study of cellular and tissue changes, Journal of the american society for horticultural science, vol. 125, pp.350-356, (2000).

DOI: 10.21273/jashs.125.3.350

Google Scholar

[5] M. C. Alamar, et al., Micormechanical Behavior of Apple Tissue in Tensile and Compression Test: Storage Conditions and Cultivar Effect, Journal of Food Engineering, (2008).

Google Scholar

[6] M. C. Alamar, et al., Micromechanical behaviour of apple tissue in tensile and compression tests, FRUTIC05, Information and technology for sustainable fruit and vegetable production, pp.12-16. 09, (2005).

Google Scholar

[7] A. McGarry, Cellular basis of tissue toughness in carrot (Daucus carota L. ) storage roots, Annals of botany, vol. 75, pp.157-163, (1995).

DOI: 10.1006/anbo.1995.1007

Google Scholar

[8] E. Vanstreels, et al., Micromechanical behaviour of onion epidermal tissue, Postharvest Biology and Technology, vol. 37, pp.163-173, (2005).

DOI: 10.1016/j.postharvbio.2005.04.004

Google Scholar

[9] L. Mayor, et al., Relation between mechanical properties and structural changes during osmotic dehydration of pumpkin, Food Research International, vol. 40, pp.448-460, (2007).

DOI: 10.1016/j.foodres.2007.02.004

Google Scholar

[10] A. Deyo, Cucurbitaceae, presented at the Food for Tought: the science, culture and politics of food, (2008).

Google Scholar

[11] B. Emadi, et al., Mechanical properties of pumpkin, International Journal of Food Properties, vol. 8, pp.277-287, (2005).

Google Scholar

[12] T. Napier, Pumpkin Production, ed, (2009).

Google Scholar

[13] Cucurbits, R. I. R. a. D. Corporation, Ed., ed: Australian Gavernment.

Google Scholar

[14] Compression test of food materials of convex shape, ASAE, (2008).

Google Scholar

[15] B. Emadi, et al., Mechanical properties of pumpkin, International Journal of Food Properties, vol. 8, pp.277-287, (2005).

Google Scholar

[16] M. Shirmohammadi and P. K. D. V. Yarlagadda, Experimental Study on Mechanical Properties of Pumpkin Tissue, Journal of Achievements in Materials and Manufacturing Engineering, vol. 54, pp.16-24, (2012).

Google Scholar

[17] Maryam Shirmohammadi and P. K. D. V. YARLAGADDA, Properties of Tough Skinned Vegetable-Pumpkin Tissue, presented at the 11th Global Congress on Manufacturing and Management GCMM2012, AUT University Auckland New Zealand, (2012).

Google Scholar

[18] M. Shirmohammadi, et al., Mechanical Behaviours of Pumpkin Peel under Compression Test, Advanced Materials Research, vol. 337, pp.3-9.

DOI: 10.4028/www.scientific.net/amr.337.3

Google Scholar

[19] M. F. de Escalada Pla, et al., Pumpkin (< i> Cucurbita moschata</i> Duchesne ex Poiret) mesocarp tissue as a food matrix for supplying iron in a food product, Journal of Food Engineering, vol. 92, pp.361-369, (2009).

DOI: 10.1016/j.jfoodeng.2008.11.013

Google Scholar