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Interpretation and analysis of solvent and physico-chemical parameters of choline-amino acid deep eutectic solvents and their aqueous mixtures over the kinetic response

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dc.contributor.authorCampodónico, Paola
dc.contributor.authorCalfuman, Karla
dc.contributor.authorSuárez, Cristian
dc.contributor.authorAlcázar, Jackson
dc.contributor.authorOlivares, Belén
dc.date.accessioned2026-09-08T13:40:08Z
dc.date.available2026-09-08T13:40:08Z
dc.date.issued2025
dc.description.abstractThis study underscores the pivotal role of choline-amino acid deep eutectic solvents, [ChCl][AA], in the hydrolysis reaction of p-nitrophenyl laurate (p-NPL), used here as a model reaction to evaluate solvent effects in various aqueous compositions. The [ChCl][AA] analyzed were choline methionine ([ChCl][Met]), and choline proline ([ChCl][Pro]). Hydrolysis reaction was performed both in the absence and presence of the enzyme Candida Antarctica Lipase B (CALB), allowing for detailed examination of how the reaction media influences enzymatic activity. Results indicate that varying solvent compositions significantly affect CALB’s catalytic behavior. A kinetic analysis, along with physicochemical evaluations, supports these findings. Notably, in the non-enzymatic hydrolysis, [ChCl][Met] showed a rate one order of magnitude higher than [ChCl][Pro]. The concentration of the phenolate form also increased with higher molar fractions ( χ ) of [ChCl][AA], implying direct involvement of [ChCl][AA] in phenoxide formation. Conversely, in the enzymatic reaction, [ChCl][Pro] facilitated a rate approximately 3.5 times faster than [ChCl][Met], with rates increasing as χ χ increased. This effect is attributed to the rigid structure of proline, which may induce beneficial conformational changes in CALB. Lineweaver-Burk plots revealed that optimal enzymatic performance occurred in media rich in [ChCl] [Met] ( = 0.85), suggesting that such environments impose structural constraints that stabilize CALB. This stability may arise from the formation of a solvation shell near the [ChCl][AA]. Surface tension data further suggest that at specific compositions, 3D assemblies form, mimicking pure [ChCl][AA] behavior. Overall, this study emphasizes the potential of [ChCl][AA] as green solvents in biocatalysis applications.
dc.description.versionVersión Publicada
dc.identifier.citationPaola R. Campodónico, Karla Calfuman, Cristian Suárez-Rozas, Jackson J. Alcázar, Belén Olivares, Interpretation and analysis of solvent and physico-chemical parameters of choline-amino acid deep eutectic solvents and their aqueous mixtures over the kinetic response, Journal of Molecular Liquids, Volume 439, Part A, 2025, 128862, ISSN 0167-7322, https://doi.org/10.1016/j.molliq.2025.128862. (
dc.identifier.doihttps://doi.org/10.1016/j.molliq.2025.128862
dc.identifier.urihttps://hdl.handle.net/11447/11083
dc.language.isoen
dc.subjectGreen chemistry
dc.subjectBiocatalysis
dc.subjectSolvent effects
dc.subjectHydrogen bonds
dc.subjectAmino acids
dc.subjectAqueous mixtures
dc.subjectEnzymatic hydrolysis
dc.titleInterpretation and analysis of solvent and physico-chemical parameters of choline-amino acid deep eutectic solvents and their aqueous mixtures over the kinetic response
dc.typeArticle
dcterms.accessRightsAcceso Abierto
dcterms.sourceJournal of Molecular Liquids
dspace.entity.typePublication

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