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118 results on '"Melai, Bernardo"'

8. Development of a colorimetric dosimeter for styrene exposure in shipyards

Author

Vivaldi, Federico Maria, primary, Cerchiai, Alberto, additional, Lomonaco, Tommaso, additional, Santalucia, Delio, additional, Poma, Noemi, additional, Bonini, Andrea, additional, Biagini, Denise, additional, Salvo, Pietro, additional, Melai, Bernardo, additional, Fanizza, Carla, additional, and Di Francesco, Fabio, additional

Published
2022
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10. Synthesis and reactivity of haloacetato derivatives of iron(II) including the crystal and the molecular structure of [[Fe[(C[F.sub.3]COOH).sub.2][([mu]-C[F.sub.3]COO).sub.2]].sub.n]

Author

Marchetti, Fabio, Melai, Bernardo, Pampaloni, Guido, and Zacchini, Stefano

Subjects
Molecular structure -- Research, Iron compounds -- Structure, Iron compounds -- Chemical properties, Chemical bonds -- Analysis, Chemistry
Abstract

The syntheses and reactivity of haloacetates of iron(II) are presented. The isolated compounds are formed due to C-X activation (X = Cl, Br) and haloacetato decomposition, which occurs with concomitant oxidation at the metal centers.

Published
2007

14. A Voltammetric pH Sensor for Food and Biological Matrices

Author

Vivaldi, Federico Maria, primary, Santalucia, Delio, primary, Poma, Noemi, primary, Bonini, Andrea, primary, Salvo, Pietro, primary, Del Noce, Lorenzo, primary, Melai, Bernardo, primary, Kirchhain, Arno, primary, Kolivoska, Viliam, primary, Sokolova, Romana, primary, Hromadovà, Magdaléna, primary, and Di Francesco, Fabio, primary

Published
2020
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15. A Graphenic Biosensor for Real-Time Monitoring of Urea During Dialysis

Author

Bonini, Andrea, primary, Vivaldi, Federico Maria, additional, Herrera, Elisa, additional, Melai, Bernardo, additional, Kirchhain, Arno, additional, Sajama, Noemi Violeta Poma, additional, Mattonai, Marco, additional, Caprioli, Raffaele, additional, Lomonaco, Tommaso, additional, Francesco, Fabio Di, additional, and Salvo, Pietro, additional

Published
2020
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18. Essential oil composition of Salvia rosmarinus Spenn. wild samples collected from six sites and different seasonal periods in Elba Island (Tuscan Archipelago, Italy).

Author

Flamini, Guido, Najar, Basma, Leonardi, Michele, Ambryszewska, Katarzyna E., Cioni, Pier Luigi, Parri, Federico, Melai, Bernardo, and Pistelli, Luisa

Subjects
ESSENTIAL oils, MULTIVARIATE analysis, SALVIA, SOIL composition, ARCHIPELAGOES
Abstract

The hydrodistilled essential oils from eighteen samples of Salvia rosmarinus Spenn. collected in six localities of Elba Island (Tuscany, Italy) during three different seasonal periods were analyzed by GC-MS for the first time. Fifty-five components were identified, representing 96.8–99.6% of the total chemical composition. All the tested essential oils were characterized by a high content of monoterpenes (oxygenated 49.2–80.3%; hydrocarbons 18.7–48.3%). Among them, 1,8-cineole (26.4–49.1%), α-pinene (4.5–34.8%), camphor (1.1–18.8%) and borneol (1.7–16.2%) were the main constituents. The high amount of 1,8-cineole/α-pinene/camphor/borneol may suggest the presence of an intermediate rosemary chemotype. Statistical analysis was also performed on the essential oil (EO) composition evidenced an expected difference depending on the collection seasons, to the geographical areas and soil composition. A comparison with the essential oil composition from S. rosmarinus collected in all the other islands of Tuscan Archipelago (Italy) was also reported, together with a Multivariate Statistical Analysis. [ABSTRACT FROM AUTHOR]

Published
2022
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19. Microwave-enhanced ionothermal CuAAC for the synthesis of glycoclusters on a calix[4]arene platform

Author

Vecchi, Alessandra, Melai, Bernardo, Marra, Alberto, Chiappe, Cinzia, and Dondoni, Alessandro

Subjects
Copper compounds -- Chemical properties, Copper compounds -- Thermal properties, Copper compounds -- Electric properties, Ionic liquids -- Chemical properties, Ionic liquids -- Thermal properties, Ionic liquids -- Electric properties, Biological sciences, Chemistry
Abstract

A tetra-azido calix[4]arene derivative has reacted with ethynyl tetra-O-benzyl-C-galactoside in the presence of CuI and i-[Pr.sub.2]EtN in three different ionic liquids. The reactions are performed by thermal and microwave dielectric heating and the click CuAAC in ionic liquids is a complementary green method to that using water as a solvent.

Published
2008

20. Validation of the copper(I)-catalyzed azide-alkyne coupling in ionic liquids: synthesis of a triazole-linked C-disaccharide as a case study

Author

Marra, Alberto, Vecchi, Alessandra, Chiappe, Cinzia, Melai, Bernardo, and Dondoni, Alessandro

Subjects
Copper compounds -- Structure, Copper compounds -- Chemical properties, Copper compounds -- Thermal properties, Chemical synthesis -- Analysis, Thermodynamics -- Analysis, Biological sciences, Chemistry
Abstract

The thermodynamic study of the copper(I)-catalyzed azide-alkyne click reaction in ionic liquids (ILs) is reported. The reaction involves cycloaddtion of a sugar azide with sugar acetylene in presence of 10 ILs as well as in standard molecular solvents (toluene and DMF) to yield 1,4-disubstituted triazole-linked C-disaccharide.

Published
2008

24. Temperature- and pH-sensitive wearable materials for monitoring foot ulcers

Author

Salvo,Pietro, Calisi,Nicola, Melai,Bernardo, Dini,Valentina, Paoletti,Clara, Lomonaco,Tommaso, Pucci,Andrea, Di Francesco,Fabio, Piaggesi,Alberto, Romanelli,Marco, Salvo,Pietro, Calisi,Nicola, Melai,Bernardo, Dini,Valentina, Paoletti,Clara, Lomonaco,Tommaso, Pucci,Andrea, Di Francesco,Fabio, Piaggesi,Alberto, and Romanelli,Marco

Abstract

Pietro Salvo,1,2 Nicola Calisi,1 Bernardo Melai,1 Valentina Dini,3 Clara Paoletti,1 Tommaso Lomonaco,1 Andrea Pucci,1 Fabio Di Francesco,1 Alberto Piaggesi,4 Marco Romanelli3 1Department of Chemistry and Industrial Chemistry, University of Pisa, 2Institute of Clinical Physiology, National Council of Research, 3Wound Healing Research Unit, Department of Dermatology, University of Pisa, 4Diabetic Foot Section, Department of Medicine, University of Pisa, Pisa, Italy Abstract: Foot ulcers account for 15% of comorbidities associated with diabetes. Presently, no device allows the status of foot ulcers to be continuously monitored when patients are not hospitalized. In this study, we describe a temperature and a pH sensor capable of monitoring diabetic foot and venous leg ulcers developed in the frame of the seventh framework program European Union project SWAN-iCare (smart wearable and autonomous negative pressure device for wound monitoring and therapy). Temperature is measured by exploiting the variations in the electrical resistance of a nanocomposite consisting of multiwalled carbon nanotubes and poly(styrene-b-(ethylene-co-butylene)-b-styrene). The pH sensor used a graphene oxide (GO) layer that changes its electrical potential when pH changes. The temperature sensor has a sensitivity of ~85 Ω/°C in the range 25°C–50°C and a high repeatability (maximum standard deviation of 0.1% over seven repeated measurements). For a GO concentration of 4 mg/mL, the pH sensor has a sensitivity of ~42 mV/pH and high linearity (R2=0.99). Keywords: diabetic foot ulcer, wearable sensors, wound temperature, wound pH

Published
2017

31. Chemical composition of volatiles emitted by Ziziphus jujuba during different growth stages.

Author

Bandeira Reidel, Rose Vanessa, Melai, Bernardo, Cioni, Pier Luigi, and Pistelli, Luisa

Subjects
*JUJUBE (Plant), *PLANT growth, *PLANT physiology, *PLANT genetics, *SOLID phase extraction
Abstract

The volatiles emitted in vivo by different organs (leaf, bud flower, flower, green and red fruits) of Ziziphus jujuba were analysed using HS-SPME-GC/MS. A total of 144 compounds were identified corresponding to 94.6-99.4% of the whole aroma profile of jujube samples. The main constituents detected were (E, E)-α-farnesene, (E)-β-ocimene, perillene, γ-terpinene, cis-sabinene-hydrate, trans-sabinene-hydrate and 4-terpineol. The SPME analyses of the collected samples showed different patterns of emission and can contribute to understand their ecological interactions and fruit production management. [ABSTRACT FROM AUTHOR]

Published
2018
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38. Determination of total and unbound warfarin and warfarin alcohols in human plasma by high performance liquid chromatography with fluorescence detection

Author

Lomonaco, T, Ghimenti, S, Piga, I, Onor, M, Melai, B, Fuoco, R, Di Francesco, F, Lomonaco, Tommaso, Ghimenti, Silvia, Piga, Isabella, Onor, Massimo, Melai, Bernardo, Fuoco, Roger, Di Francesco, Fabio, Lomonaco, T, Ghimenti, S, Piga, I, Onor, M, Melai, B, Fuoco, R, Di Francesco, F, Lomonaco, Tommaso, Ghimenti, Silvia, Piga, Isabella, Onor, Massimo, Melai, Bernardo, Fuoco, Roger, and Di Francesco, Fabio

Abstract

Two analytical procedures are presented for the determination of the total content and unbound fraction of both warfarin and warfarin alcohols in human plasma. Chromatographic separation was carried out in isocratic conditions at 25. °C on a C-18 reversed-phase column with a mobile phase consisting of a 70% buffer phosphate 25. mM at pH. = 7, 25% methanol and 5% acetonitrile at a flow rate of 1.2. mL/min. Fluorescence detection was performed at 390. nm (excitation wavelength 310. nm). Neither method showed any detectable interference or matrix effect. Inter-day recovery of the total warfarin and warfarin alcohols at a concentration level of 1000. ng/mL was 89. ±. 3% and 73. ±. 3%, respectively, whereas for their unbound fraction (at a concentration level of 10. ng/mL) was 66. ±. 8% and 90. ±. 7%, respectively. The intra- and inter-day precision (assessed as relative standard deviation) was <10% for both methods. The limits of detection were 0.4 and 0.2. ng/mL for warfarin and warfarin alcohols, respectively. The methods were successfully applied to a pooled plasma sample obtained from 69 patients undergoing warfarin therapy. © 2013 Elsevier B.V

Published
2013

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