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Capozza P, Pellegrini F, Camero M, Diakoudi G, Omar AH, Salvaggiulo A, Decaro N, Elia G, Catucci L, Di Martino B, Fruci P, Tomassini L, Lepri E, Martella V, Lanave G. Hepadnavirus Infection in a Cat with Chronic Liver Disease: A Multi-Disciplinary Diagnostic Approach. Vet Sci 2023; 10:668. [PMID: 38133220 PMCID: PMC10747313 DOI: 10.3390/vetsci10120668] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/26/2023] [Accepted: 11/10/2023] [Indexed: 12/23/2023] Open
Abstract
A 3-year-old female stray, shorthair cat, with clinical signs and serum chemistry markers indicative of hepatic disease, was diagnosed with domestic cat hepadnavirus (DCH) infection. Coupling molecular and serological data, the infection was seemingly contextualized into a chronic phase, since IgM anti-core antibodies, a marker of early-stage Hepatitis B Virus (HBV) infection, were not detected. However, the cat possessed IgG anti-core, a common indicator of chronic HBV infection in human patients and did not show seroconversion to the anti-DCH surface antigen, considered protective during HBV infection and associated with long-term protective immunity. On genome sequencing, the DCH strain showed 98.3% nucleotide identity to strains previously identified in Italy.
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Affiliation(s)
- Paolo Capozza
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Francesco Pellegrini
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Michele Camero
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Georgia Diakoudi
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Ahmed Hassan Omar
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Anna Salvaggiulo
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Nicola Decaro
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Gabriella Elia
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | | | - Barbara Di Martino
- Faculty of Veterinary Medicine, University of Teramo, 64100 Teramo, Italy; (B.D.M.); (P.F.)
| | - Paola Fruci
- Faculty of Veterinary Medicine, University of Teramo, 64100 Teramo, Italy; (B.D.M.); (P.F.)
| | - Letizia Tomassini
- Istituto Zooprofilattico Sperimentale dell’Umbria e delle Marche, 06126 Perugia, Italy;
| | - Elvio Lepri
- Department of Veterinary Medicine, University of Perugia, 06126 Perugia, Italy;
| | - Vito Martella
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
| | - Gianvito Lanave
- Department of Veterinary Medicine, University of Bari, 70010 Bari, Italy; (P.C.); (F.P.); (M.C.); (G.D.); (A.H.O.); (A.S.); (N.D.); (G.E.); (G.L.)
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Depalo N, De Leo V, Corricelli M, Gristina R, Valente G, Casamassima E, Comparelli R, Laquintana V, Denora N, Fanizza E, Striccoli M, Agostiano A, Catucci L, Curri ML. Lipid-based systems loaded with PbS nanocrystals: near infrared emitting trackable nanovectors. J Mater Chem B 2017; 5:1471-1481. [PMID: 32264638 DOI: 10.1039/c6tb02590k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hydrophobic PbS nanocrystals (NCs) emitting in the near infrared spectral region were encapsulated in the core of micelles and in the bilayer of liposomes, respectively, to form polyethylene glycol (PEG)-grafted phospholipids. The phospholipid-based functionalization process of PbS NCs required the replacement of the pristine capping ligand at the NC surface with thiol molecules. The procedures carried out for two systems, micelles and liposomes, using PEG-modified phospholipids were carefully monitored by optical, morphological and structural investigations. The hydrodynamic diameter and the colloidal stability of both micelles and liposomes loaded with PbS NCs were evaluated using Dynamic Light Scattering (DLS) and ζ-potential experiments, and both were satisfactorily stable in physiological media. The cytotoxicity of the resulting PbS NC-loaded nanovectors was assessed by the in vitro investigation on Saos-2 cells, indicating that the toxicity of the PbS NC loaded liposomes was lower than that of the micelles with the same NC cargo, which is reasonable due to the different overall composition of the two prepared nanocarriers. Finally, the cellular uptake in the Saos-2 cells of both the NC containing systems was evaluated by means of confocal microscopy studies by exploiting a visible fluorescent phospholipid and demonstrating the ability of both luminescent nanovectors to be internalized. The obtained results show the great potential of the prepared emitting nanoprobes for imaging applications in the second biological window.
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Affiliation(s)
- N Depalo
- Istituto per i Processi Chimico-Fisici-CNR UOS Bari, Via Orabona 4, 70125 - Bari, Italy.
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Longobardi F, Casiello G, Cortese M, Perini M, Camin F, Catucci L, Agostiano A. Discrimination of geographical origin of lentils (Lens culinaris Medik.) using isotope ratio mass spectrometry combined with chemometrics. Food Chem 2015; 188:343-9. [DOI: 10.1016/j.foodchem.2015.05.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 04/27/2015] [Accepted: 05/06/2015] [Indexed: 11/26/2022]
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Longobardi F, Casiello G, Ventrella A, Mazzilli V, Nardelli A, Sacco D, Catucci L, Agostiano A. Electronic nose and isotope ratio mass spectrometry in combination with chemometrics for the characterization of the geographical origin of Italian sweet cherries. Food Chem 2014; 170:90-6. [PMID: 25306321 DOI: 10.1016/j.foodchem.2014.08.057] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 08/06/2014] [Accepted: 08/12/2014] [Indexed: 11/30/2022]
Abstract
Sweet cherries from two Italian regions, Apulia and Emilia Romagna, were analysed using electronic nose (EN) and isotope ratio mass spectrometry (IRMS), with the aim of distinguishing them according to their geographic origin. The data were elaborated by statistical techniques, examining the EN and IRMS datasets both separately and in combination. Preliminary exploratory overviews were performed and then linear discriminant analyses (LDA) were used for classification. Regarding EN, different approaches for variable selection were tested, and the most suitable strategies were highlighted. The LDA classification results were expressed in terms of recognition and prediction abilities and it was found that both EN and IRMS performed well, with IRMS showing better cross-validated prediction ability (91.0%); the EN-IRMS combination gave slightly better results (92.3%). In order to validate the final results, the models were tested using an external set of samples with excellent results.
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Affiliation(s)
- F Longobardi
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy.
| | - G Casiello
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - A Ventrella
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - V Mazzilli
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - A Nardelli
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - D Sacco
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy
| | - L Catucci
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy; Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici (IPCF-CNR), sez. di Bari, Via Orabona 4, 70126 Bari, Italy
| | - A Agostiano
- Dipartimento di Chimica, Università di Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy; Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici (IPCF-CNR), sez. di Bari, Via Orabona 4, 70126 Bari, Italy
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Longobardi F, Ventrella A, Casiello G, Sacco D, Catucci L, Agostiano A, Kontominas MG. Instrumental and multivariate statistical analyses for the characterisation of the geographical origin of Apulian virgin olive oils. Food Chem 2012; 133:579-84. [PMID: 25683436 DOI: 10.1016/j.foodchem.2012.01.059] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 01/05/2012] [Accepted: 01/19/2012] [Indexed: 10/14/2022]
Abstract
In this paper, virgin olive oils (VOOs) coming from three different geographic origins of Apulia, were analysed for free acidity, peroxide value, spectrophotometric indexes, chlorophyll content, sterol, fatty acid, and triacylglycerol compositions. In order to predict the geographical origin of VOOs, different multivariate approaches were applied. By performing principal component analysis (PCA) a modest natural grouping of the VOOs was observed on the basis of their origin, and consequently three supervised techniques, i.e., general discriminant analysis (GDA), partial least squares-discriminant analysis (PLS-DA) and soft independent modelling of class analogy (SIMCA) were used and the results were compared. In particular, the best prediction ability was produced by applying GDA (average prediction ability of 82.5%), even if interesting results were obtained also by applying the other two classification techniques, i.e., 77.2% and 75.5% for PLS-DA and SIMCA, respectively.
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Affiliation(s)
- F Longobardi
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy.
| | - A Ventrella
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy
| | - G Casiello
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy
| | - D Sacco
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy
| | - L Catucci
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy; IPCF-CNR, sez. Bari, Via Orabona 4, 70126 Bari, Italy
| | - A Agostiano
- Dipartimento di Chimica, Campus Universitario, Università di Bari, Via Orabona 4, 70126 Bari, Italy; IPCF-CNR, sez. Bari, Via Orabona 4, 70126 Bari, Italy; INSTM, Via G. Giusti 9, 50121 Firenze, Italy
| | - M G Kontominas
- Laboratory of Food Chemistry and Technology, Department of Chemistry, University of Ioannina, P.O. Box 1186, 45110 Ioannina, Greece
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Maragos CM, Appell M, Lippolis V, Visconti A, Catucci L, Pascale M. Use of cyclodextrins as modifiers of fluorescence in the detection of mycotoxins. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2008; 25:164-71. [PMID: 18286406 DOI: 10.1080/02652030701564555] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Cyclodextrins, cyclic oligosaccharides composed of amylose subunits, are known to interact with mycotoxins. The interactions may be useful to analytical chemists by altering the properties of the mycotoxin of interest, namely the chromatographic properties, electrophoretic properties, fluorescence, or absorption of these fungal metabolites. Practical applications of these effects have been the incorporation of cyclodextrins into high-performance liquid chromatography and capillary electrophoresis methods for mycotoxin detection. Specific mycotoxins include those with a native fluorescence such as the aflatoxins, ochratoxin A (OTA) and zearalenone (ZEN) as well as those that can be rendered fluorescent through derivatization, such as T-2 toxin. The literature describing the applications of cyclodextrins in mycotoxin analysis is reviewed and an attempt to extend the use of cyclodextrins to the detection of labelled T-2 toxin is presented. Twenty cyclodextrins were evaluated for their ability to enhance the fluorescence emission of T-2 toxin derivatized with pyrene-1-carbonyl cyanide (T2-Pyr). This evaluation revealed that heptakis (2,6-di-O-methyl)-beta-cyclodextrin (DIMEB), in particular, enhanced T2-Pyr fluorescence. DIMEB was used as a buffer modifier in a capillary electrophoresis-laser-induced fluorescence (CE-LIF) method for detecting T-2 in maize. Because of the effects that certain cyclodextrins have, especially under aqueous conditions, they may make useful additives for a variety of mycotoxin analytical methods.
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Affiliation(s)
- C M Maragos
- Mycotoxin Research Unit, USDA-ARS-NCAUR, Peoria, IL 61604, USA.
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Ventrella A, Catucci L, Agostiano A. Effect of aggregation state, temperature and phospholipids on photobleaching of photosynthetic pigments in spinach Photosystem II core complexes. Bioelectrochemistry 2008; 73:43-8. [DOI: 10.1016/j.bioelechem.2008.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2007] [Revised: 03/14/2008] [Accepted: 04/07/2008] [Indexed: 11/24/2022]
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Ventrella A, Catucci L, Mascolo G, Corcelli A, Agostiano A. Isolation and characterization of lipids strictly associated to PSII complexes: Focus on cardiolipin structural and functional role. Biochimica et Biophysica Acta (BBA) - Biomembranes 2007; 1768:1620-7. [PMID: 17490608 DOI: 10.1016/j.bbamem.2007.03.024] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 03/13/2007] [Accepted: 03/29/2007] [Indexed: 11/21/2022]
Abstract
In this work, lipid extracts from spinach membrane fragments enriched in Photosystem II (PSII) and from spinach PSII dimers were analyzed, by means of Thin Layer Chromatography (TLC) and Electro-Spray Ionization Mass Spectrometry. Cardiolipin found in association with PSII was isolated and purified by preparative TLC, then characterized by mass and mass-mass analyses. Cardiolipin structures with four unsaturated C18 acyl chains and variable saturation degrees were evidenced. Structural and functional effects of different phospholipids on PSII complexes were investigated by Fluorescence, Resonance Light Scattering and Oxygen Evolution Rate measurements. An increment of PSII thermal stability was observed in the presence of cardiolipin and phosphatidylglycerol.
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Affiliation(s)
- A Ventrella
- Dip. di Chimica, Università di Bari, Via Orabona 4, 70126 Bari, Italy
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9
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Abstract
In this work the effect of temperature and n-dodecyl-beta-d-maltoside (DM) on PSII complexes organization was investigated. An aggregation process of PSII monomers and dimers was documented at different temperatures and low DM concentration by steady-state fluorescence, absorption, circular dichroism, Rayleigh and dynamic light-scattering experiments. Measures of oxygen evolution enabled us to estimate the change in photoactivity of PSII during the aggregation. This process was found to be extensively reversed by increasing DM concentration as proved by means of steady-state fluorescence and dynamic light-scattering experiments.
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Affiliation(s)
- A Ventrella
- Dipartimento di Chimica, Universita' di Bari, Via Orabona 4, 70126 Bari, Italy
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Dentuto PL, Catucci L, Cosma P, Fini P, Agostiano A, Hackbarth S, Rancan F, Roeder B. Cyclodextrin/chlorophyll a complexes as supramolecular photosensitizers. Bioelectrochemistry 2007; 70:39-43. [PMID: 16731052 DOI: 10.1016/j.bioelechem.2006.03.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2005] [Indexed: 11/28/2022]
Abstract
The interactions between chlorophyll a, and three cyclodextrins, hydroxypropyl-beta-cyclodextrin heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin and hydroxypropyl-gamma-cyclodextrin, were studied in aqueous solutions by means of absorption, emission and circular dichroism spectroscopy. Nanosecond laser flash photolysis and steady-state singlet oxygen generation experiments were performed to clarify the photoactivity of chlorophyll a in these systems. Moreover the photosensitizing activity of these complexes towards human leukemia T-lymphocytes (Jurkat cells) was tested and compared with that of the free sensitizer, chlorophyll a. The results obtained indicate that each cyclodextrin is able to carry the pigment in monomeric form inside of cells producing singlet oxygen.
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Affiliation(s)
- P L Dentuto
- Dipartimento di Chimica Università di Bari Via Orabona 4, 70126 Bari, Italy.
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Abstract
In this work, we performed investigations on the lipid content of higher plants (spinach) under hyperosmotic stress, by means of thin layer chromatography (TLC) and mass spectrometry. In particular, the experiments have been performed at different plant organization levels: whole leaves, freshly prepared protoplast suspension and mesophyll cells obtained by reformation of the cell wall from protoplast suspension. The results obtained showed that hyperosmotic stress induces changes in the phospholipid content depending on the different plant organization levels studied. All phospholipids showed an increment of their content in stressed whole leaves. In particular, phosphatidylglycerol (PG) redoubles its content by 1 h of osmotic shock. Different responses to hyperosmotic stress were reported for the other systems. In the case of protoplasts, an increment of PG, phosphatidylcholine (PC) and phosphatidylinositol (PI) together with biphosphatidylglycerol (BPG) and phosphatidylethanolamine (PE) content decreasing were observed in stressed sample. For PG, identified as PG (34:4) by elecrospray ionization mass spectrometry, the increment was of about 30%. In the case of cells, conversely, a decrease of PG content under osmotic stress was recorded. The results suggest an important role of phospholipids, in particular of PG, in the osmotic stress response.
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Affiliation(s)
- L Bavaro
- Dip. di Chimica, Universita' di Bari, Via Orabona 4, 70126 Bari, Italy
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Depalo N, Catucci L, Mallardi A, Corcelli A, Agostiano A. Enrichment of cardiolipin content throughout the purification procedure of photosystem II. Bioelectrochemistry 2004; 63:103-6. [PMID: 15110257 DOI: 10.1016/j.bioelechem.2003.09.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Revised: 09/18/2003] [Accepted: 09/22/2003] [Indexed: 10/26/2022]
Abstract
Photosystem II is a multisubunit membrane complex which performs the water oxidation process in the higher plants. Core dimers and monomers of photosystem II have been isolated from thylakoid membranes by sucrose density gradient centrifugation. Lipids extracted from different photosystem II-enriched fractions obtained from spinach thylakoids have been analysed by thin layer chromatography. Cardiolipin is enriched throughout the purification of photosystem II complexes; in particular dimers contained two times more cardiolipin than their monomeric counterparts.
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Affiliation(s)
- N Depalo
- Dipartimento di Chimica, Università di Bari, via Orabona 4, I-70126 Bari, Italy
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Fini P, Castagnolo M, Catucci L, Cosma P, Agostiano A. Calorimetric evaluation of the acetone partition in AOT/water/isooctane microemulsions. Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2004.06.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Fini P, Longobardi F, Catucci L, Cosma P, Agostiano A. Spectroscopic and electrochemical study of Rose Bengal in aqueous solutions of cyclodextrins. Bioelectrochemistry 2004; 63:107-10. [PMID: 15110258 DOI: 10.1016/j.bioelechem.2003.09.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Revised: 09/18/2003] [Accepted: 09/24/2003] [Indexed: 11/18/2022]
Abstract
The interaction of Rose Bengal (RB) in aqueous solution of LiClO4 0.1 M with alpha-cyclodextrin (alpha-CD), hydroxypropyl-beta-cyclodextrins (HP-beta-CD) and hydroxypropyl-gamma-cyclodextrins (HP-gamma-CD) were studied by spectrophotometric measurements. The presence of Induced Circular Signals and the results of the analysis of the modifications in the absorbance spectra of RB produced by the presence of CDs in solution indicate that RB forms inclusion complexes only with HP-beta-CD and with HP-gamma-CD.
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Affiliation(s)
- P Fini
- Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari, Via Orabona 4, 70126 Bari, Italy.
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Catucci L, Lattanzio VMT, Lobasso S, Agostiano A, Corcelli A. Role of endogenous lipids in the chromophore regeneration of bacteriorhodopsin. Bioelectrochemistry 2004; 63:111-5. [PMID: 15110259 DOI: 10.1016/j.bioelechem.2003.09.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Revised: 09/22/2003] [Accepted: 09/25/2003] [Indexed: 10/26/2022]
Abstract
The regeneration method of Khorana [J. Biol. Chem. 262 (1987) 9271] has been modified in order to study the effect of endogenous archaeabacterial lipids and, in particular, of glycocardiolipin (GlyC) in the refolding and chromophore regeneration of bacteriorhodopsin (BR). BR refolding and chromophore regeneration could be obtained in the presence of endogenous lipid mixtures containing or not containing glycocardiolipin; however, the kinetics of bacteriorhodopsin regeneration in the presence of glycocardiolipin was faster than in its absence. These results show for the first time that the interaction of glycocardiolipin with bacteriorhodopsin favours its refolding from the denaturated state and the chromophore regeneration.
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Affiliation(s)
- L Catucci
- Dipartimento di Chimica, Università di Bari, Via Orabona 4, 70126 Bari, Italy
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Agostiano A, Catucci L, Colafemmina G, Della Monica M, Scheer H. Relevance of the chlorophyll phytyl chain on lamellar phase formation and organisation. Biophys Chem 2000; 84:189-94. [PMID: 10852306 DOI: 10.1016/s0301-4622(00)00137-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A series of modified chlorophylls (chlorophyll a, pyrochlorophyll a, Zn-pheophytin a and Zn-pheophorbide a) have been inserted into lamellar phases of sodium bis-(2-ethylhexyl)-sulfosuccinate (AOT). The role played by the different functional groups in affecting the bilayer formation and organisation has been investigated by means of the NMR quadrupolar splitting technique. Evidence is reported for the first time on the capacity of the phytyl chain of the chlorophylls to anchor the tetrapyrroles into the bilayer, favouring at the same time the regular formation of the lamellae.
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Cosma P, Agostiano A, Catucci L, Ceglie A, Colafemmina G, Mallardi A, Palazzo G, Trotta M, Monica MD. Chlorophyll a Molecular Organization and Photoreactivity. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/978-94-011-0822-5_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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