Comprehensive physicochemical evaluation of choline chloride-based natural deep eutectic solvents

A Chemosensor of 1,8-Dihydroxyanthraquinone PMOs Prepared in a Ternary Deep Eutectic Solvent for the Sensitive Detection of Cu2+

“…The peak at 1464 cm −1 can be ascribed to the C−N stretching vibration. 32 As for EG, the stretching vibration of −OH is at 3435 cm −1 . The symmetric and antisymmetric stretching vibration peaks of −CH 2 − are at 2950 and 2880 cm −1 .…”

“…The peaks at 1680 and 1616 cm –1 belong to the stretching vibration of −CO and the bending vibration of −NH. The peak at 1464 cm –1 can be ascribed to the C–N stretching vibration . As for EG, the stretching vibration of −OH is at 3435 cm –1 .…”

Quantification of Caffeine Interactions in Choline Chloride Natural Deep Eutectic Solvents: Solubility Measurements and COSMO-RS-DARE Interpretation

“…Natural deep eutectic solvents (NADES) can be regarded as a sub-type of DES and differ from other eutectic solvents by the fact that they include organic acids, alcohols, amino acids, sugars or other plant-based primary metabolites as their components [ 50 , 51 ]. A very popular compound used in NADES is choline chloride, the advantages of which include its non-toxicity and low cost [ 52 ]. NADES experience many beneficial properties which include low volatility, sustainability and biodegradability, low cost and simplicity of preparation, as well as the potential of fine-tuning for specific applications [ 53 , 54 , 55 , 56 ].…”

Physicochemical Properties of Choline Chloride-Based Natural Deep Eutectic Solvents (NaDES) and Their Applicability for Extracting Oil Palm Flavonoids

“…Meanwhile, the bands observed between 1000 to 1300 cm −1 in the fingerprint region of all the NaDES IR spectra were attributable to C-O, C-C-O and C-O-C stretching and C-O-H bending vibrations. For GLY, the band at 1038 cm −1 may be attributable to the C-O linkage between C 1 and C 3 of glycerol, while the band at 1110 cm −1 could be due to the C 2 C-O stretching vibration [37]. The O-H stretching vibrations are displayed as an intense absorption band at 3350 cm −1 in the FT-IR spectrum of each HBD, which corresponded to the hydroxyl groups in their structures.…”

“…Ultrasonication could have caused a higher and more rapid mass transfer of flavonoids from the OPL powder into the more viscous NaDES, which generated similar results to those of the MeOH. The antioxidant or free-radical-scavenging activities of NaDES have been poorly investigated, but in recent years, some studies reported on the antioxidant activities of NaDES using various antioxidant assays, such as oxygen radical activity (ORAC) [42,45] and ferric reducing antioxidant power (FRAP) [37]. The OPL flavonoids are well known to possess high free-radical-scavenging activity [18,19].…”