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275 results on '"Cucciniello, Raffaele"'

13. Efficient and selective extraction of oleanolic acid from grape pomace with dimethyl carbonate.

Author

Errichiello, Francesco, Cucciniello, Raffaele, Tomasini, Michele, Falivene, Laura, Gambuti, Angelita, Cassiano, Chiara, and Forino, Martino

Subjects
*GRAPES, *WASTE recycling, *ETHANES, *SOLUBILITY, *SOLVENTS
Abstract

Grape pomace is a major winery solid residue and several tons are annually produced worldwide. Since it is a valuable source of high value-added compounds, many strategies have been implemented for its valorization. The extraction of bioactive molecules with a broad range of applications is certainly the most investigated topics. In this context, oleanolic acid, a triterpenoid with a relevant biological activity, has been recently detected in grape pomace in remarkable quantities (0.45 mg per gram of fresh pomace). Herein, we report on a selective extraction of oleanolic acid from grape pomace by using dimethyl carbonate (DMC), a recommended green solvent as a better alternative to fossil-based solvents. Chemical–physical properties, Hildebrand's solubility and Kamlet–Abboud–Taft parameters have been considered to select a greener alternative to fossil-based solvents and theoretical calculations have been performed to determine the interaction between DMC and the oleanolic acid. The obtained grape pomace extracts were characterized by means of NMR and LC-MS. DMC allows the recovery of oleanolic acid from grape pomace, due to its weak polarity and poor ability to form H-bonds, with a molar selectivity of 61%, thus promoting the adoption of alternative green and sustainable technologies for biomass residue valorization. Also, DMC was recycled and reused in three consecutive extractions and no significant losses in terms of oleanolic acid extraction yield were detected. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Effect of the Polarity of Solvents on Periodic Precipitation: Formation of Hierarchical Revert Liesegang Patterns

Author

Holló, Gábor, Zámbó, Dániel, Deák, András, Rossi, Federico, Cucciniello, Raffaele, Nostro, Pierandrea Lo, Nabika, Hideki, Baytekin, Bilge, Lagz, István, Itatani, Masaki, and Baytekin, Bilge

Subjects
Polarity, Solvents, Chromates, Materials Chemistry, Nanoparticles, Water, Dimethyl Sulfoxide, Precipitation, Copper, Physical and Theoretical Chemistry, Self organization, Surfaces, Coatings and Films
Abstract

Liesegang pattern (LP) is one example of self-organized periodic precipitation patterns in nonequilibrium systems. Several studies have demonstrated that the LP morphology can track physicochemical environmental conditions (e.g., temperature); however, the polarity effect has not been explored to date. In this study, a copper chromate system is used to reveal the impact of solvent polarity on the evolving LP structure using water/organic solvent mixtures. In the typical case of using water/dimethyl sulfoxide (DMSO) mixtures, two drastic changes in LP morphology with increasing DMSO contents were found: (i) increasing frequency of the original structure and (ii) formation of a hierarchical pattern with the appearance of another, lower-frequency structure. Furthermore, the simulation model operating with a bimodal size distribution, allowing both homogeneous and heterogeneous precipitations showed good agreement with the experimental results. Therefore, this study demonstrated that LP can be tailored by solvent polarity and can be used for designing hierarchical precipitation patterns in a straightforward manner.

Published
2022
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40. Development and validation of an eco-compatible UV–Vis spectrophotometric method for the determination of Cu2+ in aqueous matrices.

Author

Prete, Prisco, Iannaccone, Davide, Proto, Antonio, Tobiszewski, Marek, and Cucciniello, Raffaele

Subjects
ANALYTICAL chemistry, POLLUTION, DISTILLED water, SUSTAINABLE chemistry, DATA recovery, WATER sampling, DRINKING water
Abstract

Cu2+ are ubiquitous ions in the ecosystem and are responsible of serious environmental pollution. Indeed, the development of sensitive methods for Cu2+ detection is an urgent demand. In this work, we proposed a new spectrophotometric method for Cu2+ determination in different water matrices (distilled water, drinking water, wastewater, and river water). The method employs a bio-based organic ligand namely tetrasodium iminodisuccinate (IDS) able to form a stable complex with the analyte with a maximum absorption at 710 nm. Within the linear range of 6.3–381 mg L−1, the limit of detection (LOD) was determined to be as 1.43 mg L−1. Moreover, the recovery data of the spiked analysis of drinking/river/wastewater water samples were also satisfactory and verified the feasibility of the method for the analysis of Cu2+ in natural conditions. Finally, the AGREE assessment tool was used for a quantitative evaluation of the proposed method and reference method, in agreement with the green analytical chemistry principles. The results showed the lower environmental impact of the proposed method and the suitability of this novel approach for Cu2+ in water matrices. [ABSTRACT FROM AUTHOR]

Published
2023
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