New Study Investigates Biologically Active Amino Acids Based Deep Eutectic Solvents on Sodium Dodecyl Sulfate

Two researchers from Mahaveer Academy of Technology and Science (MATS) University in India are investigating the impact of three newly synthesized biologically deep eutectic solvents (DES), derived from amino acids (L-Aspartic acid [DES1], L-Tyrosine [DES2], L-Glutamine [DES3]), and choline chloride, on the micellar characteristics of anionic sodium dodecyl sulfate (SDS) (1). The DESs are characterized by Fourier transform infrared (FT-IR) spectroscopy. The study, which was published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, also used techniques including surface tension, viscosity, UV–visible spectroscopy, and fluorescence to assess their interactions with SDS at 5 and 10 wt% concentrations in aqueous solutions (1).

The critical micelle concentration (CMC) and interfacial characteristics of SDS are studied in the presence and absence of the DESs. The surface tension method is used to evaluate parameters including CMC, efficiency of adsorption, maximum surface excess concentration, packing parameter, minimum area per molecule, and surface pressure at CMC. The fluorescence data, along with surface tension and UV–visible methods, are found to be consistent. The FT-IR technique is utilized to explore interactions leading to structural changes in the surfactant self-assemblies within aqueous DESs.

The results highlight that the presence of these biological DESs significantly facilitates the micellization process for SDS, with DES2 showing greater affinity compared to DES1 and DES3. The study indicates that the rise in DES concentration results in a substantial decrease in the CMC value of SDS, demonstrating favorable micellization behavior. This finding is confirmed by UV–visible spectroscopy and fluorescence methods.

The FT-IR data emphasize the involvement of specific functional groups in the complexation of SDS-DESs. The research builds upon previous work on the synthesis and characterization of DESs, extending its application to the study of their effects on the micellization behavior of ionic liquids and conventional surfactants. This current study aligns well with prior research findings, contributing to a comprehensive understanding of the molecular interactions between amino acid based DESs and SDS, potentially benefiting the colloidal properties of DESs and their combinations with water.

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Reference

(1) Kumar Banjare, M.; Barman, B. Effect of Biologically Active Amino Acids Based Deep Eutectic Solvents on Sodium Dodecyl Sulfate: A Comparative Spectroscopic Study. Spectrochim. Acta Part A: Mol. and Biomol. Spectrosc. 2024, 308, 123700. DOI: 10.1016/j.saa.2023.123700