However, it should be
noted that the error associated with this extraction
procedure was still relatively large as evidence
from the presence of two outliers in Figure 6, in
which the level of extracted anthraquinone (mg/
ml) at 65 and 95% ethanol were much lower than
those at 50, 80 and 100% ethanol. Further
experimentation should be conducted to
investigate whether extraction time beyond 5 min
and extraction pressure (5 – 20 psi) play any part
in stabilizing the extraction efficiency as well as
the positioning or the number of extraction
containers presence in the pressurized steamer that
might influence or interfere the accessing pattern
of steam to each container.