Effects Of Ultrasound-assisted Extraction Research Articles

Ultrasound-assisted extraction and profile characteristics of seed oil from Isatis indigotica Fort

In order to further exploit the by-products of Isatis indigotica Fort., the seed oil was studied for its extraction and physicochemical properties. Ultrasound-assisted extraction (UAE) was used, and the parameters affecting seed oil recovery were optimized through response surface methodology (RSM). The optimum conditions were as follows: solvent-to-sample, 24:1; particle size, 110 meshes; extraction temperature, 49 °C; and extraction time, 44 min. Which resulted in a maximum oil recovery of 81.20 ± 0.21% ( n = 3). Furthermore, the effects of UAE on the yield, fatty acid compositions, physicochemical properties, and microstructure of the seed powder were also investigated by calculating the recovery rate, utilizing a gas chromatograph fitted with a mass spectrometer (GC–MS), and performing scanning electron microscopy, respectively. The results show that UAE was an effective method for the seed oil extraction and the high content of unsaturated fatty acids (93.81%) demonstrates the oil has potential benefits for the cosmetics, edible products, or pharmaceutical industries.

Comparison of Different Techniques for Extraction of Biologically Active Compounds from Achillea Millefolium Proa

The effect of ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE) and conventional extraction (CE) on the extraction of biologically active compounds from Achillea millefolium Proa has been investigated. The extracts were analyzed by spectrophotometric methods. The influence of the extraction time and the solvent on the yields of total extract (TEC), total phenolic compounds (TPhC), flavonoids (FC) and sesquiterpene lactones (SLC) has been studied. It was found that TEC and TPhC increased with increasing the solvent polarity in order CHCl3, MeOH and 80% MeOH. The extraction with MeOH gave maximum amount of flavonoids, while the SLC was found to be almost equal in all used solvents. UAE for 60 min and MAE for 60 s afforded higher or almost equal TEC, TPhC and FC than those obtained by CE for 24 h. The best extraction of sesquiterpene lactones was achieved with CHCl3 for 20 min of ultrasound treatment and 20 s of microwave irradiation.