Abstract:
The effect of moisture content on some physical and mechanical properties of two varieties of tigernuts (Cyperus
esculentus) was investigated. These properties include: geometric dimensions, linear dimensions, 1000 tuber
weight, bulk density, tuber size, sphericity, angle of repose, porosity, coefficient of static friction and
compressive strength. The moisture content levels used were 20, 25, 30, 35 and 40% wet basis (wb), and the two
tigernut varieties used were yellow and brown types. The linear dimension, geometric diameter, sphericity, 1000-
tuber weight, bulk density and angle of repose in both varieties increased with increasing moisture content. The
average length, width and thickness of the yellow variety increases more than the brown variety at the
determined moisture contents. True density of the yellow variety increased while the brown variety decreased
with increase in moisture content. The porosity of the yellow variety reduces with increase in moisture content
from 45.95 at 20% mc to 42.4 at 40% mc, while the brown variety decreased from 42.72 at 20% mc to 30.77 at
40% moisture content. The yellow variety had bigger size tubers than the brown variety and this has serious
implications in packing, handling and transportation issues
