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Primary Metabolites and Energy of Oak Fruits （Quercus spp.） in Khamza Mountain Oak Forest in Sulaimani I Iraqi Kurdistan Region

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Journal of Chemistry and Chemical Engineering 2010年第6期4卷 15-21页

作者： Noori Hassan Ghafour miran madhar rada baban College of Science Education University of Sulaimani Sulaimani Iraq College of Science University of Sulaimani Sulaimani Iraq

This study was conducted to determine primary metabolites （protein, fat and total carbohydrate） and energy in various parts of Oak fruit （cotyledon, pericarp and cupules） for each of Quercus aegilops Subsp. brantii, Quercus infectoria and Quercus libani. Oak fruits were collected during October in 2008 from three different native species of Quercus spp. in Khamza Mountain oak forest in Sulaimani city of Iraqi Kurdistan. The fruit samples were dried for moisture by oven and ash by Muffle Furnace. Samples were also analyzed for protein by Kjeldahl, fat by Soxhlet, total carbohydrate and energy by calculation （Atwater system）. This study revealed significant and high significant differences （P _〈 0.05 and P 〈 0.01） by using Duncan＇ s multiple range as a test of comparisons between means of studied species for various parts of oak fruits in content of energy and food compounds for each part of oak fruit. The energy content for cotyledon was 404.826-410.558 kcal/100g DM; pericarp, 397.618-406.850 kcal/100g DM and cupules, 387.100-391.109 kcal/100g DM; the maximum value for energy content was found in cotyledon of Q. infectoria. Protein content in cotyledon was 3.406-5.426% DM; pericarp, 2.542-2.609% DM and cupules, 1.272-2.066% DM, that cotyledon ofQ. aegilops Subsp. brantii contain highest amount of protein. Fat content in cotyledon was 3.375-3.942% DM; pericarp, 1.754-2.766% DM and cupules, 1.464-2.165% DM, maximum content of fat was found in cotyledon of Q. infectoria. Total Carbohydrate content in cotyledon was 88.491-90.364% DM; pericarp, 92.486-92.947% DM and cupules, 90.594-92.977% DM, the cupules of Q. infectoria contained highest content of total Carbohydrate.

关键词： Quercus spp. kjeldahl soxhlet.

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