Extraction of oil from Portulaca oleracea seeds using supercritical carbon dioxide technique

چکیده مقاله

Supercritical carbon dioxide extraction (SC-CO2) of oil from Portulaca oleracea (P. oleracea, purslane) seeds and its physicochemical properties were investigated with the results then compared to those of conventional method. P. oleracea could be considered a source of omega-3 polyunsaturated fatty acids (PUFAs). Optimization conditions for fatty acids extraction from purslane seeds by SFE method were carried out using response surface methodology (RSM) based on central composite design (CCD), so as to evaluate effects of various operating parameters including pressure, temperature, particle size and extraction time on the extraction amount of oil.The identified content of saturated fatty acid (Consisting of palmitic (C16:0) and stearic acids (C18:0)) were lower than that of unsaturated fatty acid (UFA) (including palmitoleic (C16:1), oleic (C18:1), linoleic (C18:2) and linolenic acids (C18:3)). The unsaturated fatty acids (UFA) content was around 78.8% of total FAs .The oil analysis has also proved a good ratio between omega-6 and omega-3 fatty acids, so purslane could be recommended as an alternative vegetal source for PUFAs.