Solid–liquid extraction has been improved in the
presence of high pressure, which could increase the extract yields
in much shorter extraction time at lower temperature compared to
HRE. The pressure-enhanced solid–liquid extraction (PSE) is a
novel method to enhance mass transport process, which generally
works at pressure ranging from 100 to 600 MPa and temperature of
20–60 C, and has been recognized as an environment-friendly
technology by the US Food and Drug Administration [18]. The mild
processing temperature of PSE may lead to an enhanced extraction
of thermolabile bioactive ingredients. This aspect of the process is
of paramount importance with heat-sensitive components. In
recent years, it is reported that PSE has been successfully used in
the extraction of sulforaphane [16], polysaccharides [17] and phenolic
compounds [19] from different plants. These studies show