Brand new Dual Absorption and Emission Smartphone-Based Spectrophotometer (DAESS) for the study of the role of water in the preparation of Natural Deep Eutectic Solvents

VIDAL, EZEQUIEL; LORENZETTI, ANABELA S.; GOMEZ, FEDERICO J.V.; SILVA, MARÍA F.; DOMINI, CLAUDIA E.

ANALYTICA CHIMICA ACTA

ELSEVIER SCIENCE BV

Año: 2021 vol. 1179

0003-2670

Natural Deep Eutectic Solvents (NADES) are highly important for Green Chemistry principles and can beused instead of harmful organic solvents. Indeed, nowadays smartphone-based analytical devices canreplace some traditional laboratory equipment. In the present work, a smartphone based dual spec-trophotometer and spectrofluorometer device was designed, 3D manufactured, and validated. A reso-lution of 0.241±0.010 pixel.nm1and a stability comparable with commercial instruments wereobtained. Using the proposed device it was possible, for thefirst time, to study the role of water in NADES(fructose:urea:water) preparation, by testing the influence of structural and dilution water. In this sense,it was observed that when water was added before NADES preparation (integrated into the super-structure of the solvent),fluorescence and absorbance intensities sharply decayed (up to 90% and 95%,respectively). In contrast, dilution water had minor effects on spectroscopic features of the eutecticsystem, which was expressed as 29% and 23% of diminution of signal intensities for both techniques. Theobtained results suggest that the moment the water is added plays a significant role in NADES properties