Optimization of fatty acids extraction from Portulaca oleracea seed using response surface methodology

Purslane (Portulaca oleracea) could be considered a source of omega-3 polyunsaturated fatty acids (PUFAs). Optimization conditions for fatty acids extraction from purslane seeds with ethylic ether were investigated using response surface methodology (RSM). The studied factors which influence the extraction yield were: temperature, extraction time and liquid/solid ratio. The optimal conditions for fatty acids extraction were obtained as follows: temperature 30.3 °C, extraction time 46 min and liquid/solid ratio 7.71 mL/g. Under these conditions the maximal value obtained for the oil extraction yield was 15.41 ± 0.26%, which is in a good agreement with the predicted value of 15.36%. 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.

► Extraction of fatty acids from Portulaca oleracea was investigated.
► Response surface methodology was used to optimize the extraction process.
► P. oleracea could be a healthy source for omega-6 and omega-3 acids.