jzs-10812

Physicochemical properties of Walnuts (Juglans regia L.) shells and kernels growing in different locations in Kurdistan region-Iraq   

Hayman Saeed Salih

Department of Chemistry, College of Science, Garmian University, Kalar, Kurdistan Region- Iraq

*Corresponding author’s e-mail: hayman.saeed@garmian.edu.krd

Original: 17 July 2020        Revised: 10 August 2020        Accepted: 23 August 2020        Published online: 20 December 2020  

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Abstract

Some physicochemical properties of walnut shell, kernel and oil of fifteen samples of walnut grown in different locations in Kurdistan region-Iraq were determined. Three principal dimensions such as length, width and thickness, volume and projected area of walnut and its kernels were measured using image processing technique. Based on three principal dimensions, some dimensional properties including geometric mean diameter, arithmetic mean diameter, sphericity, volume and surface area of the nuts and kernels were calculated. Also gravimetric properties of nuts and kernels such as true density of nuts and kernels were studied. Furthermore other physical properties such as weight of nut, weight of kernel, percentage yield of walnut, total oil content, ash contents, moisture contents, pH value, relative density and refractive index of the oils were also determined.  

The variations in physical properties such as size dimensions, arithmetic mean diameter, geometric mean diameter, unit mass, sphericity, surface area, true density and volume of shells and kernel of walnuts as a function of the moisture content were determined. With an increase in the moisture content, the surface area, sphericity, true density and volume of shells and kernel of walnuts increased. In addition, the oil yields from the kernels had ranged between 36.07% to 70.24%. The moisture contents of shells and kernels ranged between 6.34% to 10.11% and 3.68% to 5.62%, respectively; and the ash content of kernels were ranged between 0.94% to 2.2%. On the other hand, the refractive index of oils were determined between 1.4734 and 1.4767, pH-values of kernel oils were ranged between 6.23 and 7.02 and the relative density were determined between 0.9746 and 0.9801.  Finally the present study was showed that the walnut kernels in Kurdistan region did not show any considerable significant variations with reference to their physical and chemical properties.

Key Words: walnut (Juglans regia L.), physicochemical properties, moisture content, refractive index

References 

[1] Zwarts, GP Savage, DL McNeil, L. "Fatty acid content of New Zealand-grown walnuts (Juglans regia L.)". International Journal of Food Sciences and Nutrition. Vol. 50, No. 3, pp. 189-194. (1999).

[2] Agriculture Organization of the United Nations. Commodities, & Trade Division. "The state of agricultural commodity markets". Information Division, Food and Agriculture Organisation of the United Nations. (2006). 

[3] Gharibzahedi, S. M. T., Mousavi, S. M., Hamedi, M., & Khodaiyan, F. "Determination and characterization of kernel biochemical composition and functional compounds of Persian walnut oil". Journal of food science and technology. Vol. 51, No. 1, pp. 34-42. (2014).

[4] Jahanban-Esfahlan, A., Ostadrahimi, A., Tabibiazar, M., & Amarowicz, R. "A comprehensive review on the chemical constituents and functional uses of walnut (Juglans spp.) husk". International journal of molecular sciences. Vol. 20, No. 16, pp. 3920. (2019).

[5] Martínez, M. L., Mattea, M. A., & Maestri, D. M. "Varietal and crop year effects on lipid composition of walnut (Juglans regia) genotypes". Journal of the American Oil Chemists' Society. Vol. 83, No. 9, pp. 791-796. (2006).

[6] Miraliakbari, H., & Shahidi, F. "Antioxidant activity of minor components of tree nut oils". Food Chemistry. Vol. 111, No. 2, pp. 421-427. (2008).

[7] AltuNtAS, E., & Erkol, M. "Physical properties of shelled and kernel walnuts as affected by the moisture content". Czech Journal of Food Sciences. Vol. 28, No. 6, pp. 547-556. (2010).

[8] Dash, A. K., Pradhan, R. C., Das, L. M., & Naik, S. N. "Some physical properties of simarouba fruit and kernel". International Agrophysics. Vol. 22, No. 2, pp. 111. (2008).

[9] Williams, S. "Official methods of analysis (No. 630.24 A8 1984)". Association of Official Analytical Chemists. (1984).

[10] Khir, R., Atungulu, G. G., Pan, Z., Thompson, J. F., & Zheng, X. "Moisture-dependent color characteristics of walnuts". International Journal of Food Properties. Vol. 17, pp. 877–890. (2014). doi:10.1080/10942912.2012.675610.

[11] Jahromi, K. M., Rafiee, S., Jafari, A., Ghasemi Bousejin, M. R., Mirasheh, R., & Mohtasebi, S. S. "Some physical properties of date fruit (cv. Dairi)". International Agrophysics. Vol. 22, pp. 221–224. (2008).

[12] Spreer, W., & Muller, J. "Estimating the mass of mango fruit (Mangifera indica, cv. Chok Anan) from its geometric dimensions by optical measurement". Computers and Electronics in Agriculture. Vol. 75, pp. 125–131. (2011).

[13] Arslan, D. "Physicochemical properties, fatty acid and mineral content of some walnuts (Juglans regia L.) types". Agricultural Sciences. Vol. 1, No. 02, pp. 62. (2010).

[14] LEAHU, A., DAMIAN, C., OROIAN, M., & HREŢCANU, C. E. "Estimation of biochemical properties of walnuts from the region of Suceava-Romania". Food and Environment Safety Journal. Vol. 12, No. 2. (2016).

[15] ÖZCAN, M. M. "Some nutritional characteristics of fruit and oil of walnut (Juglans regia L.) growing in Turkey". Iranian Journal of Chemistry and Chemical Engineering (IJCCE). Vol. 28, No. 1, pp. 57-62. (2009).

[16] Pereira, J. A., Oliveira, I., Sousa, A., Ferreira, I. C., Bento, A., & Estevinho, L. "Bioactive properties and chemical composition of six walnut (Juglans regia L.) cultivars". Food and chemical toxicology. Vol. 46, No. 6, pp. 2103-2111. (2008).

[17] Özcan, M., & Seven, S. "Physıcal and chemıcal analysıs and fatty acıd composıtıon of peanut, peanut oıl and peanut butter from ÇOM and NC-7 cultıvars". Grasas y Aceites. Vol. 54, No. 1, pp. 12-18. (2003).

[18] Amaral, J. S., Casal, S., Pereira, J. A., Seabra, R. M., & Oliveira, B. P. "Determination of sterol and fatty acid compositions, oxidative stability, and nutritional value of six walnut (Juglans regia L.) cultivars grown in Portugal". Journal of Agricultural and Food Chemistry. Vol. 51. No. 26, pp. 7698-7702. (2003).

[19] Yang, J., Liu, R. H., & Halim, L. "Antioxidant and antiproliferative activities of common edible nut seeds". LWT-Food Science and Technology. Vol. 42, No. 1, pp. 1-8. (2009).

[20] Özcan, M. "Characteristics of fruit and oil of terebinth (Pistacia terebinthus L) growing wild in Turkey". Journal of the Science of Food and Agriculture. Vol. 84, No. 6, pp. 517-520. (2004).

[21] Guil, J. L., Gimenez, J. J., Torija, M. E. "Mineral Nutrient Composition of Edible Wild Plants". J. Food Compositon and Analysis. Vol. 11, pp. 322. (1998).

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