2.6. Tableting process and checking few properties of tablet
Tableting of fruit powders were carried out according to a direct
compaction method (Yusof et al., 2012). A 2.5 (±0.01) gm sample
was poured into the cylindrical uniaxial die of size 20 (±0.01) mm.
The universal testing machine (Instron Universal Testing Machine-
5566, Canton MA, UK) was used to compress the powder into tablet
form. The machine was operated using Bluehill software (Canton
MA USA) which was maintained at a compaction speed of 0.1 mm/
min at 9.8 kN force. Upon compression the tablets were ejected
from the die and kept in air tight containers for further study. The
dimensions of the tablets were measured by using digital slide
calipers. The moisture content of the tablets was determined by
using oven drying method. The density of the tablets was calculated
from the ration of mass over volume of the tablet.
2.7. Porosity
The porosity of the tablets was calculated from tablet density and true density of the tablet ingredient (Adolfsson and Nystrom, €
1996). It may be calculated using the following equation: