With increasing pressure, the density of the tablets increased and
consequently porosity of the powder was decreased (Fig. 2a). This
trend was similar to the findings reported by Yusof et al. [23] on
Andrographis paniculata tablets. Among the three tablets, guava powder
showed the lowest density followed by mixed fruit powder and the
pitaya powder possessed the highest density. Hence, guava powder
was the lowest compressible powder, whereas pitaya powder was
highly compressible. Similar findings were reported by Yusof et al. [7]
on the compression of pitaya powder dried in mechanical driers. However, mixing of the two powders improved compressibility significantly
comparedto guavapowder alone sincestiffnessofthepressure–density
curve of the mixed fruit tablet was in between pitaya and guava tablets.
Due to the low particle size of pitaya powder, it was able to accommodate more inter-particle friction and thus exhibit the lower range of
density compared to guava and mixed fruit powders.