RESULTS FROM 1 TO 7 OF 7

2023, Articolo in rivista, ENG

Multinuclear solid state nuclear magnetic resonance for studying CsPbBr3 nanocubes

Scarperi, Andrea; Landi, Noemi; Gabbani, Alessio; Jarmouni, Nabila; Borsacchi, Silvia; Calucci, Lucia; Pucci, Andrea; Carignani, Elisa; Pineider, Francesco; Geppi, Marco

Cesium lead bromide perovskite (CsPbBr3) nanocrystals have raised impressive interest as efficient and stable optoelectronic materials. Size and morphology play important roles in the final performances of these materials and advanced characterization studies are needed to elucidate structural and surface properties. In this work, CsPbBr3 cubic nanocrystals were obtained by colloidal synthesis and characterized by multinuclear Solid State NMR (SSNMR), complemented by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and optical spectroscopy. The multinuclear NMR approach allowed the different components of the nanocubes to be separately observed. In particular, the surface ligands and their interactions with the nanocubes surface were investigated by H-1 and C-13 NMR experiments, while the structural investigation of the perovskite nanocubes was addressed by exploiting Pb-207 and Cs-133 spectral properties in comparison with bulk CsPbBr3. Static Pb-207 NMR spectra indicated a possible contribution of chemical shift anisotropy from the Pb-207 nuclei of the outer layer. The Cs-133 NMR spectra showed signals with different chemical shifts for cesium atoms in at least three regions of the nanocubes, from the inner core to the surface, which were interpreted in terms of cubic layers with different distances from the surface using a simple geometrical model. This interpretation was also supported by Cs-133 longitudinal relaxation time measurements.

Pure and applied chemistry (Print) 95 (10), pp. 1031–1042

DOI: 10.1515/pac-2023-0110

2020, Articolo in rivista, ENG

The effect of sourdough fermentation on Triticum dicoccum from Garfagnana: H-1 NMR characterization and analysis of the antioxidant activity

Colosimo, Raffaele; Gabriele, Morena; Cifelli, Mario; Longo, Vincenzo; Domenici, Valentina; Pucci, Laura

The fermentation of Triticum dicoccum with sourdough enhances the nutritional aspects of the final product by the enrichment of several compounds with potential medical and biological activity, hence, could improve the health of consumers. This study analyzed the chemical composition of fermented spelt flour from Garfagnana (Province of Lucca, Tuscany) by H-1 Nuclear Magnetic Resonance (H-1 NMR) spectroscopy and its in vitro antioxidant properties by FRAP and DPPH tests. Beyond this, the ex vivo CAA-RBC assay determined the cellular antioxidant activity on human erythrocytes under oxidative condition. Carbohydrate reduction was observed, while amino acids, organic acids and aromatic compounds with potential antioxidant activity increased during the fermentation time. Moreover, both in vitro and ex vivo outcomes showed an improved antioxidant profile. As a possible industrial application, the fermentation process adopted in this research could be reproduced on a large scale for the commercialization of the products by the food industry.

Food chemistry 305

DOI: 10.1016/j.foodchem.2019.125510

2017, Articolo in rivista, ENG

Carbon source effects on the mono/dirhamnolipid ratio produced by Pseudomonas aeruginosa L05, a new human respiratory isolate

Nicolo, Marco S.; Cambria, Maria G.; Impallomeni, Giuseppe; Rizzo, Maria G.; Pellicorio, Cinzia; Ballistreri, Alberto; Guglielmino, Salvatore P. P.

Pseudomonas strains produce rhamnolipid mixtures (RLs) that generally consist of one or two molecules of rhamnose linked to one or two molecules of 3-hydroxyalkanoic acid. This study evaluates carbon source effects (glycerol, glucose, myristic acid, and Brassica carinata oil) on the synthesis of monorhamnolipids (mono-RLs) versus dirhamnolipids (di-RLs) in a human isolate of Pseudomonas aeruginosa PAL05. Spectrophotometry, an emulsifying index (E24) test, and an orcinol assay confirmed the production of RLs by PAL05. Purified RLs were characterized by H-1 NMR analysis. PAL05 primarily produces mono-RLs when provided carbon sources containing long chain fatty acids (FAs) (myristic acid and B. carinata oil) and di-RLs when provided glycerol or glucose. qRT-PCR analysis showed that delayed expression of rhlC occurred when B. carinata oil was used, but not glycerol, glucose, or myristic acid. Our data show that the carbon source influenced the transcriptional expression of the rhlC gene and, consequently, the predominance of mono-RLs or di-RLs in PAL05 cultures. (C) 2017 Published by Elsevier B.V.

New biotechnology (Print) 39, pp. 36–41

DOI: 10.1016/j.nbt.2017.05.013

2014, Articolo in rivista, ENG

Chemical curing in alkyd paints: An evaluation via FT-IR and NMR spectroscopies

Bartolozzi, G.; Marchiafava, V.; Mirabello, V.; Peruzzini, M.; Picollo, M.

A study aimed at determining the time necessary for an alkyd paint to attain chemical curing is presented. In particular, the object of our investigation was an oil paint made by Winsor & Newton, namely French ultramarine (PB29) in the Griffin Alkyd "fast drying oil colour" series. Using this paint, we prepared several mock-ups on glass. These were left in the laboratory at room temperature in a piece of furniture with glass doors for a total of 70 days. Samples were taken at different times, and the changes in their composition were monitored by means of FT-IR and multinuclear NMR spectroscopic analyses. Since the cross-linking reactions involved in the formation of the pictorial film mainly affect the amount of carbon-carbon double bonds, we monitored the decrease in allyl, diallyl and vinyl protons and carbons. The data obtained from the use of both techniques led us to conclude that, in our particular experimental conditions, the chemical curing of the paint layer is reached within the first 70 days, thus establishing the beginning of the ageing phenomena. (C) 2013 Elsevier B.V. All rights reserved.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (Print) 118, pp. 520–525

DOI: 10.1016/j.saa.2013.09.017

2008, Articolo in rivista, ENG

NMR and Chemometric methods: A powerful combination for characterization of Balsamic and Traditional Balsamic Vinegar of Modena

Consonni roberto; Cagliani laura ruth; Benevelli francesca; Spraul manfred; Humpfer eberhard; Stocchero matteo

This work presents the capability of NMR spectroscopy combined with Chemometrics in predicting the ageing of Balsamic and Traditional Balsamic Vinegar of Modena. The need of an analytical method is an important requirement for both research oriented and commercial evaluation of these very valuable products. H-1 NMR spectroscopy, based on the advantage of rapid sample analysis without any manipulation or derivatization, is here proposed as a valid tool to describe Balsamic and Traditional Balsamic Vinegar of Modena. For this purpose, 72 reliable samples, were divided into three different groups according to their ageing process: young (<12 years), old (>12 and <25 years) and extra old (>25 years). Hierarchical Projection to Latent Structures Discriminant Analysis (PLS-DA) allowed us to characterize the ageing process. Variables showing the largest VIP (Variable Importance in the Projection) were extracted from PLS-DA model, thus shedding lights onto the role played by specific compounds in this complex ageing process. Two robust classification models, were built by PLS-DA and Naive Bayes classifier and compared to prove the accuracy of the representation on both training and test sets. The predictions obtained for 41 "unknown" vinegar samples with these both methods gave more than 80% agreement among them. (c) 2008 Published by Elsevier B.V.

Analytica chimica acta (Print) 611 (1), pp. 31–40

DOI: 10.1016/j.aca.2008.01.065

2007, Articolo in rivista, ENG

NMR relaxation data for quality characterization of balsamic vinegar of Modena

Consonni R.; Cagliani L R.

In this paper, 22 samples consisting of Balsamic vinegar of Modena and two Traditional Balsamic vinegar of Modena samples have been analyzed by means of H-1 NMR spectroscopy. Some selected resonances have been used for quantification and for T1 (spin-lattice relaxation time) measurements. Statistical protocols applied to NMR data for quantification of selected resonances revealed the possibility to differentiate the samples according to their ageing process. Additionally, T1 measurements revealed a strong correlation with the ageing process and these new data were added for improving the statistical model, which was used to predict T1 relaxation time of selected compounds for Balsamic vinegar samples. Our results indicate that the use of NMR data and statistical methods is a valid approach that can be successfully used for ageing characterization of Balsamic vinegar of Modena samples.

Talanta (Oxf.) 73, pp. 332–339

DOI: 10.1016/j.talanta.2007.03.045

1996, Articolo in rivista, ENG

H-1 NMR study of phenolics in the vegetation water of three cultivars of Olea europaea: Similarities and differences

Limiroli, R; Consonni, R; Ranalli, A; Bianchi, G; Zetta, L

In this work free phenolics and phenolic glucosides present in the water content (vegetation water, VW) of olive fruits of the three Italian cultivars (cvs.) Cipressino, Dritta, and Leccino were identified by H-1 NMR. The phenolic metabolite content of the three cultivars was studied at three fruit growth stages. The major phenolic compounds, common to all three cultivars, were 4-hydroxyphenylethanol (tyrosol) (1), 4-hydroxyphenylethanol glucoside (2), and oleuropein (3). Considerable differences in the content of compounds (1-3) were found to occur in the fruits during growth and maturation of the drupe. Glucoside (4), a major component of the low molecular weight solutes of Dritta and Leccino cvs., was not detected in Cipressino fruits. The quinol glucoside (4) was thought to derive from oxidation of the glucoside of 4-hydroxyphenylethanol (2). Hydrolysis of (4) followed by cyclization yielded the bicyclic compound halleridone (5).

Journal of agricultural and food chemistry 44, pp. 2040–2048

DOI: 10.1021/jf9507349

InstituteSelected 0/5
    ISMAC, Istituto per lo studio delle macromolecole (3)
    ICCOM, Istituto di chimica dei composti organo metallici (2)
    IBBA, Istituto di biologia e biotecnologia agraria (1)
    IFAC, Istituto di fisica applicata "Nello Carrara" (1)
    IPCB, Istituto per i Polimeri, Compositi e Biomateriali (1)
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    Consonni Roberto (3)
    Cagliani Laura Ruth (2)
    Bartolozzi Giovanni (1)
    Borsacchi Silvia (1)
    Calucci Lucia (1)
    Gabriele Morena (1)
    Impallomeni Giuseppe (1)
    Longo Vincenzo (1)
    Peruzzini Maurizio (1)
    Picollo Marcello (1)
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    Articolo in rivista (7)
Research programSelected 0/3
    PM.P06.018.001, Studio di metaboliti e matrici naturali mediante NMR e loro utilizzo e funzione nel settore agroalimentare, merceologico e della salute umana (3)
    PM.P01.026.003, Strutturistica NMR di proteine legate a processi patologici (1)
    SP.P06.012.001, Strumentazioni e metodologie spettroscopiche integrate per diagnostica e monitoraggio di beni culturali e ambientali (1)
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Keyword

H-1 NMR

RESULTS FROM 1 TO 7 OF 7