Compared to other methods, the
pressurized steamer extraction procedure yielded
the highest level of anthraquinone (0.159 ± 0.001
mg/ml in Figure 6 which was equivalent to 95.3 ±
0.6 mg/g dried root powder). The temperature
increase accelerated diffusion process while the
rise in pressure encouraged the movement of
molecules or ions in the extraction medium
(Jindawat, 2005) as evidence from the extraction
of total soluble solid (TSS) from dried longan
which found that boiling helped increase the
extraction speed and resulted in higher
concentration of extracted solute (Palakul and
Fongduang, 2006). The concentration of extracted
anthraquinone described in Figure 6, which was
later converted to mg/g,