AS  Vol.1 No.2 , August 2010
Physicochemical properties, fatty acid and mineral content of some walnuts (Juglans regia L.) types
Abstract: Some physical and chemical properties, mineral content and fatty acid compositions of kernel and oils of several walnut types (Büyük Oba, Kaman2, Kaman5) were determined. The oil yields from these kernels changed between 61.4% to 72.8%. The crude fibre contents of ker nels ranged between 3.77% and 3.80%. In add ition, crude protein contents of kernels ranged between 7.05% and 8.10%. While the peroxide values of kernel oils change between 3.18 meq/ Kg and 3.53 meq/Kg, acidity values ranged be tween 0.35% and 0.56%. The main fatty acids of walnut kernel oils were oleic, linoleic, linolenic and palmitic acids. Linoleic acid contents of ker nel oils varied between 49.7% and 55.5%. On the other hand, oleic acid contents ranged between 20.5% and 26.4%. As a result, the present study showed the walnut kernels of the researched species of walnut kernels from Turkey are a potential source of valuable oil which might be used for edible and other industrial applica tions.
Cite this paper: nullÖzcan, M. , İman, C. and Arslan, D. (2010) Physicochemical properties, fatty acid and mineral content of some walnuts (Juglans regia L.) types. Agricultural Sciences, 1, 62-67. doi: 10.4236/as.2010.12009.

[1]   ?en, S.M. (1986) Ceviz Yeti?tiricili?i. Eser Matbaas?, Samsun.

[2]   ?a?lar?rmak, N. (2003) Biochemical and physical pro perties of some walnut genotypes (Juglans regia L.). Nahrung/Food, 47(1), 2832.

[3]   ?zkan, G. and Koyuncu, M.A. (2005) Physical and chemical comparision of some walnut (Juglans regia L.) genotypes grown in Turkey. Grasas y Aceites 56(2), 142147.

[4]   Sabate, J., Fraser, G.E., Burke, K., Knutsen, S.F., Benett, H., Linstead, K.D. (1993) Effects of walnuts on serum lipid levels and blood pressure in normal men. The New England Journal of Medicine, 328(9), 603607.

[5]   Savage, G.P. (2001) Chemical composition of walnuts (Juglans regia L.) grown in New Zealand. Plant Foods for Human Nutrition, 56(1), 7582.

[6]   Olez, H. (1971) Marmara b?lgesi cevizlerinin (Juglans regia L.) seleksiyon yoluyla ?slah? üzerine ara?t?rmalar. Yalova Bah?e Kültürleri Ara?t?rma Merkezi Dergisi, 4(8), 14.

[7]   Beyhan, O.E., Kaya, I., ?en, S.M. Do?an, M. (1995) Fatty acid composition of walnut (Juglans regia L.) types selected in Darende. Turkish Journal of Agricultural Forestry 19(4), 299302.

[8]   Zwarts, L., Savage, G.P. and McNeil, B.L. (1999) Fatty acid content of New Zealandgrown walnuts (Juglans regia L.). International Journal of Food Science Nutrition, 50(3), 189194.

[9]   Greve, C., Mc Granahan, G., Hasey, J., Synder, R., Kelly, K., Gold, H. D. and Labavitch, J. (1992) Variationin polyunsaturated fatty acids composition of Persian walnut. Journal of American Social Hart Science, 117(3), 518522.

[10]   Helmy, H.E. (1990) Studies on the pigments of some citrus, prune and cucurbit seed oils when processed with or without cottonseed oil. Journal of American Oil Chemist Society, 67(6), 376380.

[11]   Association of Official Analytical Chemists (1984) Official Methods of Analysis. Association of Official Chemistry, 14th Edition, Arlington.

[12]   H???l, Y. (1998) Instrumental Analysis Techniques. Ege University Engineering Faculty Publication, Bornova ?zmir.

[13]   AOCS. (1990) Official Methods and Recommended Pra ctices. 4th Edition, American Oil Chemists Society, Champaign. II.

[14]   Skujins, S. (1998) Handbook for ICPAES (VarianVista). A short Guide to Vista Series. ICPAES Operation. VarianInt. AG. Zug. Version 1.0., Switzerland.

[15]   Püskülcü, H. and ?kiz, F. (1989) Introduction Statistic (?statisti?e Giri?). Bilgehan Press. Bornova?zmir.

[16]   Garcia, J.M., Agar, I.I. and Streit, J. (1994) Lipid characterijation in kerrels from different walnut cultivars. Turkish Journal of Agricultural Forestry, 18, 195198.

[17]   Gunstore, F.D. and Norris, F.A. (1983) Lipids in Foods: Chemistry. Biochemistry and Technology, 1st Edition, Oxford.

[18]   Colombini, M., Vanoni, M.C. and Amelotti, G. (1979) Olio di noci. nocciole. mandorle. avocado: Composizione sterolica. La Rivista Italiana delle Sostanze Grasse, 56, 392393.

[19]   Allam, S.S.H. (2001) Utilization of some untraditional sources of high oleic acid oils for improving vegetable oils stability. La Rivista Italiana Delle Sostanze Grasse 78(6), 337341.

[20]   Yücel, S.O. (2005) Determination of conjugated linolenic acid content of selected oil seeds grown in Turkey. Journal of American Oil Chemist Society, 82(12), 893897.

[21]   Koyuncu, M. and A?k?n, M.A. (1999) Van G?lü ?evre sinde yeti?tiricili?i yap?lan baz? ceviz tiplerinin depo lanmas? üzerine ?al??malar. Turkish Journal of Agricultural Forestry, 23(4), 785796.

[22]   Abbey, M., Noaks, M., Belling, G.B. and Nestel, P.J. (1994) Partial replacement of saturated fatty acids with almonds or walnuts lowers total plasma cholesterol and lowdensity lipoprotein cholesterol. American Journal Clin ical Nutrition, 59(5), 995999.

[23]   ?zcan, M. (2009) Some proximate characteristics of fruit and oil of walnut (Juglans regia L.) growing in Turkey. Iranian Journal of Chemistry & Chemical Engineering 28(1), 762.

[24]   Macrae. R., Robinson, R.K. and Sadler, M.J. (Eds.), (1993) Encyclopaedia of Food Science. Food Technology and Nutrition, Academic Press INC, San Diego, 3126 3131.

[25]   Brody, T. (1994) Nutritional Biochemistry. Academic Press, San Diego.

[26]   SauraCalixto, F. and Canellas, J. (1982) Correlations between lipid and protein contents in nuts and oil seeds. Anal Bromatol, 34, 2331.