The application of amino acid ionic liquids as additives in the ultrasound-assisted extraction of plant material

Abstract

The antioxidant activity of the aqueous extracts from Lycopodium clavatum, Cetraria islandica and Dipsacus fullonum obtained by ionic liquids and ultrasound-assisted extraction (IL-UAE) method was determined.

Deep eutectic solvent extraction of myricetin and antioxidant properties

“…Combined with the research reports on the extraction of flavonoids in plants, hydrophilic DESs were selected to extract Myricetin. 21,22 According to the molar ratio of hydrogen bond acceptor to hydrogen bond donor in Table 1, a certain mass of hydrogen bond acceptor and hydrogen bond donor was weighed into a 250 mL beaker, and the glass rod was stirred and mixed evenly. The DES was prepared by heating at 80 °C with magnetic stirring.…”

“…Ultrasonic-assisted DES extraction technology has become a research hotspot in the eld of natural product research in recent years, with signicant potential for development. 22,23 At present, research on this aspect mainly focuses on process conditions, such as the water content of the DES, liquid-solid ratio, extraction temperature, extraction time, and other factors. 24,25 Macroporous resin adsorption is based on the van der Waals attraction between the resin and myricetin through the specic surface physical adsorption of the resin, followed by eluent purication and separation using myricetin technology.…”

“…Ultrasonic-assisted DES extraction technology has become a research hotspot in the field of natural product research in recent years, with significant potential for development. 22,23 At present, research on this aspect mainly focuses on process conditions, such as the water content of the DES, liquid–solid ratio, extraction temperature, extraction time, and other factors. 24,25…”

Dipsacus and Scabiosa Species—The Source of Specialized Metabolites with High Biological Relevance: A Review

“…The most frequently used methods to determine the antioxidant properties of Dipsacus and Scabiosa plant extracts were the DPPH (2,2-diphenyl-1-picrylhydrazyl radical scavenging assay), ABTS (2,2 -azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation assay), ORAC (oxygen radical absorbance capacity), FRAP (ferric ion reducing antioxidant assay), and CUPRAC assays (cupric-reducing antioxidant capacity). The antioxidant activity varied depending on the plant material (whole plants, leaves, and roots), the solvent, extraction time, and the extraction method (Table 9) [14,24,33,34,42,46,50,52,53,56,[72][73][74]76,77,171,172]. The antioxidant activity of the methanolic extract from D. asper roots was confirmed in DPPH and Cu 2+ -mediated LDL oxidation with IC 50 values of 90.2 and 134.4 µg/mL, respectively.…”

“…On the other hand, the aqueous extract of D. fullonum leaves obtained by ultrasound assisted extraction (extraction time, four hours) showed high radical scavenging activity (RSA) (73.81%) in DPPH [172]. The procedure extraction with the aqueous solution of amino acid ionic liquids, viz., triethanolammonium salts of two amino acids methionine ([TEAH] + [Met] − ) and threonine ([TEAH] + [Thr] − ), resulted in a beneficial effect on the antioxidant activity of leaf extracts in FRAP and CUPRAC assays compared to the extract after extraction with the pure water.…”