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Extraction of raw plant material using supercritical carbon dioxide
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Resumo(s)
Many of the herbs and spices used by humans are important medicinal compounds.
The aim of this work is to investigate the extraction mechanisms of plant materials by
using supercritical fluid extraction (SFE). In order to do this, a supercritical extraction
system was designed and set-up allowing to use supercritical CO2 for the extraction of
raw plant material, such as Sassafras albidum and Berberis vulgaris.
The planned work found difficulties due to legal problems and the objective plant
material had to be changed for this reason. The first plant considered was Sassafras
albidum which later on was changed to Berberis vulgaris. Supercritical extraction in
dynamic and steady state were executed in order to study the extraction parameters and
attempt to recover a compound called berberine.
The results of the experiments show that supercritical fluid extraction is a sufficient
extraction method for the plant Berberis vulgaris. On the other hand, it was not possible
to apply any analytical methods to prove that berberine was obtained since the amount of
extract was not sufficient for the techniques available. Even so, physical properties such as
smell and yellow color of the extract suggested that berberine might have been extracted.
The whole designed supercritical extraction process needs improvements such as the
introduction of organic solvents to increase the extraction yield and the introduction
of an alternative analytical protocol such as High Performance Liquid Chromatography
(HPLC).
Descrição
Palavras-chave
Supercritical Fluid Extraction safrole berberine