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:: Volume 7, Issue 3 (Jul-Sep 2020) ::
Nutr Food Sci Res 2020, 7(3): 33-40 Back to browse issues page
Effects of Moisture Contents on Harvesting time and Drying Methods on Mechanical Properties and Electrical Conductivity of Corn Hybrids
Sajad Kordi , Feizollah Shahbazi
Lorestan University, Faculty of Agriculture, Department of Biosystems Engineering, Khoram Abad, Iran
Abstract:   (594 Views)
The aims of the experiment were to evaluate the effects of the moisture content at the time of harvest (20, 30, and 40%) and drying method (sun-dried and artificially dried (in an oven at 85-90oC) on the mechanical properties and electrical conductivity of four corn hybrids (Ns640, Jeta600, Konsur580 and, SC704) grown in one location. Results indicated that corn variety significantly influenced the mechanical properties, where Ns640 had maximum and Konsur580 had minimum values of properties than other hybrids. Variety also influenced the electrical conductivity. The Konsur580 variety in both drying methods exhibited a higher electrical conductivity. The moisture content at the time of harvest in the two drying methods significantly influenced all of the mechanical properties excepting deformation and firmness. Higher values of mechanical properties were obtained at the 20% moisture. In addition, the effect of the moisture on the electrical conductivity was significant Background and Objectives: Drying affects quality parameters of the grains. The objective of this study was to investigate effects of drying methods, moisture contents at harvesting time and corn hybrids on mechanical properties (deformation, rupture force, firmness, necessary energy and power and toughness at rupture points) and electrical conductivity of corn kernels.
Materials and Methods: The study assessed four corn hybrids (Ns640, Jeta600, Konsur580 and SC704) harvested at various moisture contents (20, 30 and 40%) and dried using two drying methods (sun dried and artificially dried using oven at 85–90 oC).
Results: Results revealed that corn variety significantly affected mechanical properties since Ns640 included the maximum and Konsur580 the minimum properties, compared to that other hybrids did. Furthermore, variety affected electrical conductivity. Konsur580 variety exhibited a higher electrical conductivity in both drying methods. Moisture contents at harvesting time significantly affected all mechanical properties, except deformation and firmness, in the two drying methods. Higher values of mechanical properties were achieved at 20% moisture. Moreover, effects of the moisture contents on electrical conductivity were significant and kernels with 40% moisture at harvesting time included higher electrical conductivities.
Conclusions: Drying methods of corn significantly affected quality parameters and electrical conductivity. Corn kernels dried in sun included higher levels of properties such as rupture force, necessary energy and power, toughness and lower levels of electrical conductivity.and kernels with 40% moisture at the time of harvest had higher electrical conductivity. The drying method of corn significantly influenced the mechanical properties and electrical conductivity. Corn kernels dried in sun had higher levels of properties including rupture force, the energy required, the power required, toughness and lower level of electrical, conductivity.
Keywords: Maize, Drying method, Harvesting time, Mechanical properties, Electrical conductivity
Full-Text [PDF 623 kb]   (270 Downloads)    
Protocol Study: Research | Subject: Food Science
Received: 2020/04/1 | Accepted: 2020/07/14 | Published: 2020/08/10
1. Doymaz I, Pala M. The thin-layer drying characteristics of corn. J Food Eng. 2003; 60(2):125-30. [DOI:10.1016/S0260-8774(03)00025-6]
2. Mujumdar AS, editor. Handbook of industrial drying. New York: Dekker; 1987 Jan 1.
3. Chakraverty A. Post-harvest technology of cereals, pulses and oilseeds. Oxford & IBH Publishing Company; 1988.
4. Lewicki PP, Pawlak G. Effect of drying on microstructure of plant tissue Dry Technol. 2003; 21(4):657-83. [DOI:10.1081/DRT-120019057]
5. Shahbazi F. Impact damage to chickpea seeds as affected by moisture content and impact velocity. Appl Eng Agric. 2011; 27(5):771-5. [DOI:10.13031/2013.39557]
6. Beke J, Vas A, Mujumdar AS. Impact op process parameters on the nutritional value of convectively dried grains. Dry Technol. 1993; 11(6):1415-28. [DOI:10.1080/07373939308916907]
7. Mohsenin NN. Physical properties of plant and animal materials. 1986.
8. Lewicki PP, Jakubczyk E. Effect of hot air temperature on mechanical properties of dried apples. J Food Eng. 2004; 64(3):307-14. [DOI:10.1016/j.jfoodeng.2003.10.014]
9. Zapotoczny P, Markowski M, Majewska K, Ratajski A, Konopko H. Effect of temperature on the physical, functional, and mechanical characteristics of hot-air-puffed amaranth seeds. J Food Eng. 2006; 76(4):469-76. [DOI:10.1016/j.jfoodeng.2005.05.045]
10. Shahbazi F. Evaluation and Modeling Some Engineering Properties of Three Safflower Varieties. Cercetari Agronomice in Moldova. 2015; 47(4):23-40. [DOI:10.1515/cerce-2015-0002]
11. Seifi MR, Alimardani R. Comparison of moisture-dependent physical and mechanical properties of two varieties of corn (Sc 704 and Dc 370). Aust J Agri Eng. 2010; 1(5):170. [DOI:10.5539/jas.v2n4p125]
12. MinaeI S, Rohe GR, Alizadeh MR. Investigation of the effects of drying parameters on rice cracking and breakage during milling. J Agri Eng Res. 2005; 6, 97-112.
13. Davidson VJ, Noble SD, Brown RB. Effects of drying air temperature and humidity on stress cracks and breakage of maize kernels. J Agri Eng Res. 2000; 77(3):303-8. [DOI:10.1006/jaer.2000.0607]
14. Montanuci FD, Cavalcante RM, Perussello CA, de Matos Jorge LM. Comparison of Drying Kinetics of Maize in Oven and in Pilot Silo Dryer: Influence on Moisture Content and Physical Characteristics. Int J Food Eng. 2016; 12(6):599-606. [DOI:10.1515/ijfe-2015-0384]
15. Baryeh EA. A simple grain impact damage assessment device for developing countries. J Food Eng. 2003; 56(1):37-42. [DOI:10.1016/S0260-8774(02)00145-0]
16. Shahbazi F, Analooei M, Saffar A. Mechanical damage to pinto bean seeds as affected by moisture content, impact velocity and seed orientation. Int J Food Eng. 2012 Jan 3; 7(6). [DOI:10.2202/1556-3758.2503]
17. Shahbazi F, Sharafi R, Moomevandi SJ, Daneshvar M. Influence of foliar iron fertilization rate on the breakage susceptibility of wheat seeds. J. Plant Nutr. 2015; 38(14):2204-16. [DOI:10.1080/01904167.2015.1043379]
18. Shahbazi F, Sharafi R, Moomevandi SJ, Daneshvar M. Mechanical damage to wheat seeds as affected by phosphorus and iron fertilization rate. Qual Assur Saf Crop. 2015; 7(3):385-91. [DOI:10.3920/QAS2013.0356]
19. Chen Y, Burris JS. Desiccation tolerance in maturing maize seed: membrane phospholipid composition and thermal properties. Crop Sci. 1991; 31(3):766-70. [DOI:10.2135/cropsci1991.0011183X003100030046x]
20. Hampton J G. Conductivity test. In: Seed vigor testing seminar. Vigor test committee. Proceedings international seed testing association, 1995.10-28. Copenhagem, Denmark. 1995.
21. Saiedirad MH, Tabatabaeefar A, Borghei A, Mirsalehi M, Badii F, Varnamkhasti MG. Effects of moisture content, seed size, loading rate and seed orientation on force and energy required for fracturing cumin seed (Cuminum cyminum Linn.) under quasi-static loading. J Food Eng. 2008; 86(4):565-72. [DOI:10.1016/j.jfoodeng.2007.11.021]
22. Olaniyan AM, Oje K. PH-postharvest technology: some aspects of the mechanical properties of shea nut. Biosys Eng. 2002; 81(4):413-20. [DOI:10.1006/bioe.2002.0049]
23. Jain RK, Bal S. Properties of pearl millet. J. Agric Eng Res. 1997; 66(2):85-91. [DOI:10.1006/jaer.1996.0119]
24. Peplinski AJ, Paulsen MR, Bouzaher A. Physical, chemical, and dry-milling properties of corn of varying density and breakage susceptibility. Cereal Chem. 1992; 69:397-400.
25. Maksoud M AA, Mechanical properties of corn kernels. Misr J of Agric Eng. 2009; 26:1901-1922. [DOI:10.21608/mjae.2009.107576]
26. Abasi S, Minaei S. Effect of drying temperature on mechanical properties of dried corn. Dry Technol. 2014 May 19; 32(7):774-80. [DOI:10.1080/07373937.2013.845203]
27. Durrant MJ, Loads AH. Some changes in sugarbeet seeds during maturation and after density grading. Seed Sci Technol. 1990; 18(1):11-21.
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Kordi S, Shahbazi F. Effects of Moisture Contents on Harvesting time and Drying Methods on Mechanical Properties and Electrical Conductivity of Corn Hybrids. Nutr Food Sci Res. 2020; 7 (3) :33-40
URL: http://nfsr.sbmu.ac.ir/article-1-398-en.html

Volume 7, Issue 3 (Jul-Sep 2020) Back to browse issues page
Nutrition and Food Sciences Research
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