Interaction Study of Binary Solvent Systems Ionic Liquid and Deep Eutectic Solvent with Rotenone

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

“…In addition, as shown in Figure 4, the NOESY spectrum of BD revealed cross-peaks between the hydroxyl proton of either choline chloride or 1,4-butanediol with a water molecule in the system (5.3/4.7 ppm), suggesting the formation of hydrogen bonds between them. A similar interaction was observed in other combinations (Figure S4) and similar findings were reported previously [25,38,39]. Thus, this suggested that the involvement of water in the supramolecular structure of NaDES could become a driving force for achieving high performance when extracting flavonoids from OPL.…”

Encapsulation of β-Carotene by Emulsion Electrospraying Using Deep Eutectic Solvents

“…Thus, the bands between 3000-3600 cm −1 are attributed to DES solvent N-H and O-H groups [49], responsible for forming hydrogen bonds with carbonyl groups of the peptides in the proteins [50]; and the bands between 2800-3000 cm −1 are assigned to DES solvent C-H stretching vibrations of carbonyl groups [51]. In addition, the ATR-FTIR spectrum of the encapsulate containing β-carotene shows a new peak at 1080 cm −1 , which corresponds to the C-O stretching peaks of the primary alcohol in ChCl:butanediol components in DES4 [52]. As seen from Figure 2, no characteristic peaks of β-carotene were detected in the ATR-FTIR spectrum of the encapsulate containing β-carotene.…”