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601 results on '"Vasapollo, Giuseppe"'

56. New TiO2 based photocatalysts for the degradation of organic pollutants in water

Author

MELE, Giuseppe Agostino, PIO, IOLANDA, VASAPOLLO, Giuseppe, García Lόpez E., Marcì G., Palmisano L., Mele, Giuseppe Agostino, Pio, Iolanda, Vasapollo, Giuseppe, García Lόpez, E., Marcì, G., and Palmisano, L.

Abstract

In the last years a new category of TiO2 based composites prepared by impregnation of bare polycrystalline TiO2 powders with different sensitizers (i.e. phthalocyanines, porphyrins) permitted the improvement of the photocatalytic degradation of 4-nitrophenol (4-NP) under UV1-3 as well as under visible light irradiation.4 On the other hand growing interest devoted to the photodegradation of organic pollutants in water solutions by means of economically advantageous and environmental friendly processes are regarding this topic. Continuing our research in this area, we report here our recent results concerning: i) the preparation of new TiO2 and TiO2 based photocatalysts containing Fe and Cu species; ii) improvement of the photodegradation processes and conditions. 1. Mele, G.; Del Sole, R.; Vasapollo, G.; García-López, E.; Palmisano, L.; Schiavello, M. J. Catal. 2003, 217, 334. 2. Mele, G. ; Del Sole, R.; Vasapollo, G.; Marcì, G.; Garcìa-Lòpez, E.; Palmisano, L.; Coronado, J. M.; Hernández-Alonso, M. D.; Malitesta, C.; Guascito, R. J. Phys Chem. B 2005, 109, 12347. 3. Mele, G.; García-López, E.; Palmisano, L.; Dyrda, G.; Słota, R. J. Phys. Chem. C, 2007, 111, 6581. 4. Wang, C.; Li, J.; Mele, G.; Yang, G. M.; Zhang, F. X.; Palmisano, L.; Vasapollo, G. Appl. Catal. B: Environ. 2007, 76, 218.

Published
2009

62. Autophagy inhibition enhances anthocyanin-inducedapoptosis in hepatocellular carcinoma

Author

VASAPOLLO, Giuseppe, LONGO, Luigia, SCARDINO, ANNA, Francesca Platini, Oscar Alabiso, Luciana Tessitore, Vasapollo, Giuseppe, Longo, Luigia, Francesca, Platini, Scardino, Anna, Oscar, Alabiso, and Luciana, Tessitore

Subjects
Anthocyanin, antioxidant and anticancer activity, Phillyrea latifolia L, Pistacia lentiscus L, and Rubia peregrina L
Abstract

Anthocyanins extracted from the berries of Phillyrea latifolia L., Pistacia lentiscus L., and Rubia peregrina L., three evergreen shrubs widely distributed in the Mediterranean area, were examined for their antioxidant and anticancer activity. The P. lentiscus anthocyanins showed the highest H2O2 and 1,1-diphenyl-2-picryl- hydrazil radical scavenging effects, indicating that these compounds can be considered as an alternative source of natural antioxidants for food and pharmaceutical products. Here, we also report a novel function of anthocyanins: the induction of autophagy, a process of subcellular turnover involved in carcinogenesis. Autophagy was characterized by the up-regulation of eIF2A, an autophagy inducer, and down-regulation of mTOR and Bcl-2, two autophagy inhibitors. This led to the enhanced expression of LC3-II, an autophagosome marker in mammals, and monodansyl- cadaverine incorporation into autolysosomes. Anthocya- nin-induced autophagy switched to apoptosis, as shown by the activation of Bax, cytochrome c and caspase 3, terminal deoxynucleotide transferase–mediated dUTP nick-end labeling–positive fragmented nuclei, and cells with sub-G1 DNA content, which were prevented by z-VAD. Inhibition of autophagy by either 3-methyladenine or Atg5 small interfering RNA enhanced anthocyanin- triggered apoptosis. This provided evidence that autoph- agy functions as a survival mechanism in liver cancer cells against anthocyanin-induced apoptosis and a ratio-nale for the use of autophagy inhibitors in combination with dietary chemopreventive agents. [Mol Cancer Ther 2008;7(8):2476–85]

Published
2008

64. Fine Chemicals and New Hybrid Materials From Cardanol

Author

MELE, Giuseppe Agostino, VASAPOLLO, Giuseppe, Mele, Giuseppe Agostino, and Vasapollo, Giuseppe

Abstract

Cardanol, a low-cost largely available renewable material obtained from distillation of CNSL (Cashew Nut Shell Liquid), has been used for the preparation of fine chemicals and hybrid materials. The long chain attached to the meta position of the phenolic ring of cardanol makes this compound a unique natural source because it confers to all derivatives, particular properties (good solubility, good processability, interesting physical properties and so on). New fine chemicals as well as new cardanol hybrid materials combined with porphyrins, phthalocyanines and fullerenes have been synthesized recently, developing at the same time new synthetic strategies for the preparation of new eco-friendly fine chemicals, composites and functional organic materials. The aim of this review is also to show that the chemistry of cardanol is becoming a stimulating area in academic and industrial research.

Published
2008

65. Anthocyanins from Prunus mahaleb L. fruits

Author

BLANDO F, NEGRO C, LONGO L., MICELI, Antonio, VASAPOLLO, Giuseppe, DE BELLIS, Luigi, Blando, F, Negro, C, Miceli, Antonio, Longo, L., Vasapollo, Giuseppe, and DE BELLIS, Luigi

Published
2008

74. Efficient degradation of 4-nitrophenol by using functionalizedporphyrin-TiO2 photocatalysts under visible irradiation

Author

WANG C., LI J., YANG G. M., ZHANG F. X., PALMISANO L., MELE, Giuseppe Agostino, VASAPOLLO, Giuseppe, Wang, C., Li, J., Mele, Giuseppe Agostino, Yang, G. M., Zhang, F. X., Palmisano, L., and Vasapollo, Giuseppe

Subjects
Porphyrin, Cu(II)-porphyrin, Titanium dioxide, Photocatalysi, 4-Nitrophenol
Abstract

The novel porphyrins 5,10,15,20-tetra-[4-(3-phenoxy)-propoxy]phenyl porphyrin, H2Pp(a) and 5,10,15,20-tetra-[2-(3-phenoxy)-propoxy]- phenyl porphyrin, H2Pp(b) and their corresponding copper(II) complexes CuPp(a), CuPp(b) were synthesized and characterized by using various spectroscopic techniques. The photocatalytic activity of polycrystalline TiO2 samples impregnated with H2Pp(a), H2Pp(b), CuPp(a) and CuPp(b) as sensitizers have been investigated by carrying out the photo-degradation of 4-nitrophenol (4-NP) as a probe reaction in aqueous suspension and under visible light. The maximum photocatalytic activity was obtained using TiO2 loaded with a monolayer of the copper porphyrin CuPp(b) in the amount of 18 mmol per gram of TiO2. The photocatalytic efficiency decreased in the following order: TiO2-CuPp(b), TiO2-CuPp(a), TiO2-H2Pp(b), TiO2-H2Pp(a). A possible mechanism of the photocatalytic degradation is also proposed.

Published
2007

75. Fine Chemicals from CNSL

Author

VASAPOLLO, Giuseppe, MELE, Giuseppe Agostino, S. E. MAZZETTO, Vasapollo, Giuseppe, Mele, Giuseppe Agostino, and S. E., Mazzetto

Published
2007

79. THE ECODONET PROJECT: DEVELOPMENT OF A MODEL WEB BASED VIRTUAL OBSERVATORY OF ACHERONTAS, KALAMAS AND TORRE GUACETO ECOSYSTEMS AND ITS APPLICATION AS A MOBILE EXHIBIT AND PERMANENT ENVIRONMENTAL KIOSK TOWARDS PUBLIC AWARENESS AND SUSTAINABLE DEVELOPMENT OF COASTAL ECOSYSTEMS

Author

D. KARAMANIS, P. ASSIMAKOPOULOS, K. IOANNIDES, A. KATSIKIS, I. LEONARDOS, C. PAPADOPOULOU, K. STALIKAS, K. STAMOULIS, N. KOTSIOS, A. KOROU, K. GRINIAS, E. MELLOS, MELE, Giuseppe Agostino, MALITESTA, Cosimino, VASANELLI, Lorenzo, VASAPOLLO, Giuseppe, A. Kungolos, K. Aravossis, A. Kargiannidis, P. Samaras, D., Karamani, Mele, Giuseppe Agostino, P., Assimakopoulo, K., Ioannide, A., Katsiki, I., Leonardo, C., Papadopoulou, K., Stalika, K., Stamouli, Malitesta, Cosimino, Vasanelli, Lorenzo, Vasapollo, Giuseppe, N., Kotsio, A., Korou, K., Grinia, and E., Mellos

Subjects
model web
Published
2007

91. SYNTHSIS OF NOVEL CARDANOL-BASED PORPHYRINS

Author

MELE, Giuseppe Agostino, VASAPOLLO, Giuseppe, YINGCEN G, ATTANASI O. A, FILIPPONE P, JUN L, Mele, Giuseppe Agostino, Yingcen, G, ATTANASI O., A, Filippone, P, Jun, L, and Vasapollo, Giuseppe

Published
2006

99. Synthesis and Characterization of Nitroso-Fulleropyrrolidines

Author

VASAPOLLO, Giuseppe, MELE, Giuseppe Agostino, LONGO, Luigia, R. IANNE, B. G. GOWENLOCK, K. G. ORRELL, Vasapollo, Giuseppe, Mele, Giuseppe Agostino, Longo, Luigia, R., Ianne, B. G., Gowenlock, and K. G., Orrell

Subjects
Nitroso, Fulleropyrrolidines
Published
2005

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