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130 results on '"Bortolomeazzi, Renzo"'

2. Genotypic and phenotypic profiling of 127 Legionella pneumophila strains: Insights into regional spread.

Author

Colautti, Andrea, Civilini, Marcello, Bortolomeazzi, Renzo, Franchi, Marinella, Felice, Antonella, De Martin, Stefano, and Iacumin, Lucilla

Subjects
LEGIONELLA pneumophila, GENOTYPES, LEGIONNAIRES' disease, FATTY acid analysis, PHENOTYPES
Abstract

Given the recent global surge in Legionnaires' disease cases, the monitoring of Legionella pneumophila becomes increasingly crucial. Epidemiological cases often stem from local outbreaks rather than widespread dissemination, emphasizing the need to study the characteristics of this pathogen at a local level. This study focuses on isolates of L. pneumophila in the Italian region of Friuli Venezia Giulia to assess specific genotype and phenotype distribution over time and space. To this end, a total of 127 L. pneumophila strains isolated between 2005 and 2017 within national surveillance programs were analysed. Rep-PCR, RAPD, and Sau-PCR were used for genotypic characterization, while phenotypic characterization was conducted through fatty acids analysis. RAPD and Sau-PCR effectively assessed genetic characteristics, identifying different profiles for the isolates and excluding the presence of clones. Although Sau-PCR is rarely used to analyse this pathogen, it emerged as the most discriminatory technique. Phenotypically, hierarchical cluster analysis categorized strains into three groups based on varying membrane fatty acid percentages. However, both phenotypic and genotypic analyses revealed a ubiquitous profile distribution at a regional level. These results suggest an absence of correlations between strain profiles, geographical location, and isolation time, indicating instead high variability and strain dissemination within this region. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Antioxidant activity of sage (Salvia oficinali and S. fructicosa) and oregano (Origanum onites and O. indercedens)extracts related to their phenolic compound content

Author

Pizzale, Lorena, Bortolomeazzi, Renzo, Vichi, S., Uberegger, E., and Conte, Lanfranco

Subjects
phenolic compound, antioxidant activity, sage (Salvia officinalis and S fruticosa), oregano (Origanum onites and O indercedens), sage (Salvia officinalis and S fruticosa), oregano (Origanum onites and O indercedens), antioxidant activity, phenolic compound
Published
2002

30. LA TECNICA NIRS NELLA VALUTAZIONE DI UOVA ED OVOPRODOTTI

Author

Conte, Lanfranco, Carazzolo, A., Baldassini, O., Bortolomeazzi, Renzo, and Piussi, D.

Subjects
SPECTROSCOPY, EGGS, SHELF LIFE, SUCCINIC ACID, FRESHNESS, HYDROXYBUTYRIC ACID, EGGS, FATTY ACIDS, FRESHNESS, HYDROXYBUTYRIC ACID, LACTIC ACID, NIR SPECTROSCOPY, ORGANIC ACIDS, SHELF LIFE, SPECTROSCOPY, SUCCINIC ACID, LACTIC ACID, FATTY ACIDS, NIR SPECTROSCOPY, ORGANIC ACIDS
Published
2002

34. Mass Spectrometry Characterization of the 5alfa-, 7alfa and 7beta-Hydroxy Derivatives of beta-sitosterol, Campesterol, Stigmasterol and Brassicasterol

Author

Bortolomeazzi, Renzo, DE ZAN, M., Pizzale, Lorena, and Conte, Lanfranco

Subjects
hydroxysterols, photooxidation, GC/MS, phytosterols, trimethylsilyl ether, sterols, mass spectra, sterols, phytosterols, hydroxysterols, photooxidation, gas chromatography/mass spectrometry, GC/MS, mass spectra, trimethylsilyl ether, gas chromatography/mass spectrometry
Published
1999

35. Thermal degradation of single 7-cholesteryl acetate hydroproxide

Author

Lercker, G., Bortolomeazzi, Renzo, and Pizzale, Lorena

Subjects
7-Cholesteryl acetate hydroperoxides (CAHPs), Thermal degradation, Gas chromatography-mass spectrometry, 7-Cholesteryl acetate hydroperoxides (CAHPs), Column liquid chromatography, Gas chromatography-mass spectrometry, Thermal degradation, Column liquid chromatography
Published
1996

38. Analysis of isomers of cholesteril acetate hydroperoxides by HPLC and GC-ITDMS

Author

Bortolomeazzi, Renzo, Pizzale, Lorena, Vichi, S, and Lercker, G.

Subjects
HYDROPEROXIDE FORMATION, COLUMN LIQUID CHROMATOGRAPHY, GAS CHROMATOGRAPHY MASS SPECTROMETRY, COLUMN LIQUID CHROMATOGRAPHY, CHOLESTERYL ACETATE, HYDROPEROXIDE FORMATION, CHOLESTERYL ACETATE, GAS CHROMATOGRAPHY MASS SPECTROMETRY
Published
1994

39. Solid Phase Extraction Coupled with Capillary GC Applied to the Determination of Mono and Diglycerides of Vegetable Oils and Fermented Foods

Author

Koprivnjak, Olivera, Petracco, Giovanna, Bortolomeazzi, Renzo, Conte, Lanfranco, Boschelle, Ornella, and Sandra, P.

Subjects
monoglycerides, diglycerides, solid phase extraction, capillary gas chromatography, olive oil, salami, cheese
Abstract

Determination of content of monoglycerides (MG) and diglycerides (DG) and 1, 2DG/1, 3DG ratio in foods that contain a high amount of fat, is considered to be somewhat useful to evaluate the age of the product (in the virgin olive oils), the ripening stage of fermented foods (salami, cheese) or to evidentiate the possible fraud (partial neutralization of virgin oils). Several authors stated that the gas chromatographic method is one of the most suitable for the determination of MG and DG, especially if a peculiar capillary column, named TAP (Chrompack s.r.l.) is adopted, which is coated with a polar high temperature stable stationary phase. The peculiar performances of this column are the possibility of separate glycerides both on the basis of their molecular weight, and on the basis of their unsaturated degree. Sample preparation involves separation of MG and DG that, e.g., are present in small amounts in olive oil: to make this step easier and faster, a solid phase extraction (SPE) technique was applied: cartridge of amino phase (Isolute TM NH2 500 mg/3ml) were used to achieve the separation of lipid fraction into polar and non polar fraction. The application of this method admit time saving, sample amount saving (50 mg ca) and the use of few ml of solvents, that is an advantage for what is concerning concentration of solvent impurities. Another advantage is that any overloading of GLC column is avoided, caused by the high amount of triglycerides. Method was applied to olive oil, salami and cheese samples and for each of them reliability was assessed, too.

Published
1994

42. Oxisterols determination in selected coffees

Author

Turchetto, E, Lercker, G, and Bortolomeazzi, Renzo

Subjects
roasted coffee, oxidation sterols, coffee, oxisterols, phytosterol oxidation, 7-keto-sitosterol
Published
1993

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