Some physical, mechanical and chemical properties of potato tubers (Spunta Variety) [electronic resource].

Includes bibliographic reference.

The main aim of this work was to study the physical,
mechanical and chemical properties of potato tubers (Spunta
variety), to help in designing and developing of specific
machine and their operations. The length, width and thickness
of potato tubers values ranged from 60.03 to 89.93, 44.67 to
60.02 and 37.69 to 44.64 mm, respectively for all treatments
under study. The geometric mean diameter and arithmetic
mean diameter of the potato tubers ranged from 46.41 to 61.97
and 47.96 to 64.86 mm, respectively. The potato tuber mass
was 63.72, 119.51 and 152.07 g for small, medium and large of
potato tuber size, respectively. The potato tuber volume was
53.54, 112.96 and 135.12 cm3for small, medium and large of
potato tuber size, respectively. The true density of the potato
tuber ranged from 1190 to 1125 kg m-3for all treatments under
study. The potato tubers surface area was 67.61, 104.68 and
120.58 cm2for small, medium and large of potato tuber size,
respectively. The sphericity and moisture content potato tuber
were 77.30, 75.02 and 68.91 and 83.64, 80.83 and 83.19 % for
small, medium and large of potato tuber size, respectively.
Total soluble solids, firmness, lightness and repose angle of
potato tubers ranged from 4.43 to 4.65, 5.40 to 5.70, 69.93 to
73.22% and 30.61 to 33.04º. The total sugar and reducing
sugar of potato tubers were 2.76, 2.30 and 2.55 and 0.49, 0.43
and 0.45 % for small, medium and large of potato tuber size,
respectively

Summary in Arabic.