Balkabağı Cucurbita pepo L. ve Karpuz Citrullus lanatus L. Tohumlarının Bazı Fiziksel Özellikleri

Kabak Cucurbita pepo L. ve karpuz Citrullus lanatus L. tohumlarının sırasıyla %9,87 ve %2,87 k.b. % kuru baz nem içeriklerindeki bazı fiziksel özellikleri belirlenmiştir. Ortalama uzunluk, genişlik, kalınlık ve geometrik ortalama çap değerleri kabak tohumu için sırasıyla 19,92; 11,30; 3,22; 9,71 mm ve karpuz tohumu için 13,28; 8,00; 2,64; 6,52 mm olarak belirlenmiştir. Ortalama 1000 tane ağırlığı, küresellik, doğal yığılma açısı, hacim ağırlığı, kütlesel yoğunluk, tane hacmi, yüzey alanı, porozite değerleri sırasıyla kabak tohumu için 261,2 g; 60,55%; 23,9°; 321,3 kg/m3; 784,3 kg/m3; 0,11 cm3; 2,54 cm2 ve 58,9% olarak, karpuz tohumu için 14,62 g; 49,2%; 19,1°; 412,2 kg/m3; 1543,3 kg/m3; 0,030 cm3; 0,48 cm2 and 47,45% olarak belirlenmiştir. Ortalama dinamik sürtünme katsayıları galvaniz sac, sunta, sac, kontrplak ve lastik yüzeylere göre kabak tohumu için sırasıyla 0,29; 0,24; 0,32; 0,36 ve 0,61, karpuz tohumu için 0,21; 0,45; 0,41; 0,57 and 0,94 olarak bulunurken, statik sürtünme katsayısı değerleri ise aynı sürtünme yüzeyleri için sırasıyla, kabak tohumunde, 0,37; 0,38; 0,38; 0,43 and 0,74 ve karpuz tohumunde ise, 0,27; 0,54; 0,48; 0,70 and 1,11 olarak belirlenmiştir. Maksimum statik ve dinamik sürtünme katsayıları lastik yüzeyde bulunmuştur

Anahtar Kelimeler:

Kabak Cucurbita pepo L. tohumu ve karpuz Citrullus lanatus L. tohumu, fiziksel özellikler

Some Physical Properties of Pumpkin Cucurbita pepo L. and Watermelon Citrullus lanatus L. Seeds

Some physical properties of pumpkin Cucurbita pepo L. and watermelon Citrullus lanatus L. seeds were determined at a moisture content of 9.87% and 2.87% dry basis , respectively. The mean values of length, width, thickness and geometric mean diameter were 19.92, 11.30, 3.22, 9.71 mm for pumpkin seeds, and 13.28, 8.00, 2.64, 6.52 mm for watermelon seeds, respectively. The mean 1000 seed mass, sphericity, angle of repose, bulk and true densities, single seed volume, surface area, porosity values were obtained as 261.2 g, 60.55%, 23.9°, 321.3 kg/m3, 784.3 kg/m3, 0.11 cm3, 2.54 cm2 and 58.9%, respecitvely for pumpkin seed; and 14.62 g, 49.2%, 19.1°, 412.2 kg/m3, 1543.3 kg/m3, 0.03 cm3, 0.48 cm2 and 47.45%, respectively for watermelon seed. The mean values of dynamic coefficient of friction against galvanized steel, chipboard, mild steel, plywood and rubber surfaces were 0.29, 0.24, 0.32, 0.36 and 0.61 for pumpkin seed, and 0.21, 0.45, 0.41, 0.57 and 0.94 for watermelon seed; while the values of static coefficient of friction were 0.37, 0.38, 0.38, 0.43 and 0.74 for pumpkin seed and 0.27, 0.54, 0.48, 0.70 and 1.11 for watermelon seed, respectively. The maximum static and dynamic coefficients of friction was found for rubber surface

Keywords:

Pumpkin Cucurbita pepo L. seed watermelon Citrullus lanatus L. seed, physical properties,

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