POLYETHYLENE SURFACE MODIFICATION BY SOLAR ELECTROSTATIC DISCHARGE SYSTEM FOR EXTEND SHELF LIFE OF SWEET PEPPER

Ahmed, Entsar Kh.G.; Elsbaay, Atef M.; AbouElhana, Nabihah H.; El-iraqi, Mahmoud E.

doi:10.21608/mjae.2017.97444

POLYETHYLENE SURFACE MODIFICATION BY SOLAR ELECTROSTATIC DISCHARGE SYSTEM FOR EXTEND SHELF LIFE OF SWEET PEPPER

Document Type : Original Article

Authors

¹ M.Sc. Student, Dept. of Ag. Eng., Fac. of Ag., Kafrelsheikh Univ., 33516, Egypt.

² Assoc. Prof. of Ag. Eng., Dept. of Ag. Eng., Fac. of Ag., Kafrelsheikh Univ. 33516 Egypt.

³ Emeritus Assoc. Prof. of Ag. Eng., Dept. of Ag. Eng., Fac. of Ag., Kafrelsheikh Univ., 33516 Egypt.

⁴ Prof. of Ag. Bio–Engineering, Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt.

10.21608/mjae.2017.97444

Abstract

Nowadays, the new and renewable energy is one of the main concern, especially the solar energy which is considered as new and renewable energy instead of other traditional energies. Therefore, the scientific research in the field of unconventional energy sources has increased due to its easy of use and low cost, as well as not polluting the environment. The main objective of this study is using of solar photovoltaic cells for operating a locally manufactured electrostatic charging unit, which used to charge and modify polyethylene sheet surface as packaging materials for extend shelf life of sweet pepper. This study was carried out at Agriculture Engineering Department, Faculty of Agriculture, KafrElsheikh University, KafrElsheikh Governorate (31.07N° and 30.57E°), Egypt during the period from June to September, 2016. The electrostatic charge unit, consists of a converting unit from low voltage to the required high voltage, which connected with control unit adjust charging speed of the polyethylene sheet surface to evaluate the charging unit on four different charging speeds of 0.01, 0.02, 0.03, 0.04 and 0.05 ms^-1 using three different ranges of high voltages and four different thickness of the polyethylene sheet (a, b, c, d, and e). The polyethylene sheets surface was treated with 3% chitosan solution (weight basic) after the polyethylene sheet surface was charged with electrostatic charge unit to modify and improve antimicrobial properties of polyethylene sheet surface as packaging materials for extend shelf life of sweet pepper. The obtained results concluded that the polyethylene sheet (type a) gave the highest value of electrostatic charge at the highest voltage range difference. Charged polyethylene sheet surface and chitosan treated gave a high antimicrobial properties against listeria monothytogene, fusariumoxysporum and Pseudomonase aeroginosa. Finally, charged polyethylene sheet surface and chitosan treated during the sweet pepper storage period gave lower values of weight loss , pH and total aerobic bacteria count as well as yeast and mold count than other samples.

Keywords

Main Subjects

Processing Engineering of Agricultural Products

References

AOAC ( Association of Official Ana lytical Chemistis ).(2002).Official Methods Of Analysis.;17 th Ed .Washington , D.C,USA.

Appendin, p. and Hotchkiss, J. H.(2002). Review of antimicrobial food packaging .Innovative Food Science &Emerging Technologies, 3(2),113-126.

Biehl, H .L. and Barringer ,S.A.(2004). Comparison of the effect of powder properties on coating transfer efficiency and dustiness in two non –electrostatic system , Innov . Food Sci. Emerg. Technol. 5:191-198.

Brody ,A .L. (2005).Edible packaging .Food Tech ,pp.56 ,65 .

Chandrasekharam D (2012) http://dchandra.geosyndicate.com

Chokmaviroj, S., R.Wattanapong, andY. Suchart. (2006). “Performancof a 500 kWp Grid Connected Photovoltaic System at Mae HProvince, Thailand.” Renewable Energy 31: 19–28.

Dastoori ,K.;Makin, B. and Telford, J.(2001). Measurements of thickness and adhesive properties of electrostatic powder coatings fstandard and modified powder coating guns, J. Electrostat. 51-25:545-551.

Ediriweera, s.;Abeywickrama , k .; Latifah,M.; Othman,F.; wan Hussin , R.&Tham, S.(2014).Quality of minimally processed, modified atmosphere stored bell pepper, as affected by pretreatment. Tropical Agricultural Research and Extension 16(2).

Eltawil, M. A., and A. M. ElSbaay. 2014 “Utilisation of solar photovoltaic pumping for aeration systems in aquaculture ponds.” International Journal of Sustainable Energy .

Eltawil, M. A., and Z. Zhengming. (2013). “MPPT Techniques for PV Applications.” Renewable and Sustainable Energy Reviews 25 (September): 793–813.

Ishaq, S;Rathore, H.A;Majeed,S.; Awan, S. and Zulifiqar-Ali-Shah,S.(2009). The studies on the physic-chemical and organoleptic characteristics of apricot(prunusarmaniaca L.) produced in Rawalakota,Azad Jammu and Kashmir during storage .Pakistan journal of Nutrition.8(6);856-860.

Kays, s.j. (1991).Post Harvest Physiology of Perishable Plant Products .Vas Nostrand Rein Hold Book, AVI publishing Co., pp149-316.

Plestenjak A, Pozrl T, Hribar J, Unuk T and Vidrih R (2008) Regulation of metabolic changes in shredded cabbage by modified atmosphere packaging. J Food Technol Biotechnol 46: 427-33.

Ruis-cruz,s:,Alvarez-parrilla,E.;delaRosa,L.A.;Martinez-Gonzalez,A.I.;Orneles-paz,J.J.;Mendza-wilson,A.M.&Gonzalez- Aguilar,G.A.(2010) .Effect of different sanitizers on microbial , sensory and nutritional quality of fresh –cut jalapeno peppers . American journal of Agriculture and Biological sciences ,5(3):331-341.

Sanchez-Valdes, S.; Ortega-Ortiz, H.; Ramos-de Valle, L.F. (2009) .; Medellin-Rodriguez, F.J. and Guedea-Miranda, R. J. Appl. Polym. Sci. 953-962.

Soares, F., Pires, A .C.S., Camilloto, G.P., Santiago-Silva, Espitia, P. P., J.P. &Silva, W.A. (2009).Resent patents on active packaging for food application. Resent patents on food, nutrition &agriculture,1,171-178.

Wu,J. .,Lee,G.J.,Chen , Y .S., and Hu , T .L. 2012 . The synthesis of chitosan polypropylene plastics for anti bacterial application. Current Applied physics , 12:89-95.