1,721,105 research outputs found
Indagine sul contenuto di sulforafano nelle crucifere alimentari mediante messa a punto di uno specifico metodo analitico
No full textIl lavoro riguarda la messa a punto ed applicazione di un metodo per l'estrazione e la quantificazione di sulforafano in crucifere alimentari
Analisi DRIFTS per la classificazione di mieli uniflorali
No full textE' stato costruito un modello atto a classificare i milei uniflorali mediante analisi spettrofotometrica DRIFTS e successiva analisi chemiometrica dei dati
La castagna un frutto dell’appennino: composizione e caratteristiche nutrizionali. (Chestnut from Emilian appennines: proximate analysis and nutritional value)
No full textChestnut, yhe fruit of castanea sativa Mill., are typical products of the Italian mountain regions and also of the Tuscan-emilia appennines. Therefore, some samples of chestnuts from Zocca (Modena) were analyzed to determine proximate analysis and other parameter usable to asses the global quality of the product. Chestnuts show high content of starch, sugars and dietary fiber. as regards mineral content, appreciable amounts are those of calcium and magnesium. Also the relationships between dietary fiber and mineral are interesting
Antioxidant activity of propolis in oil-in-water emulsion
No full textIn this work, it has been developed an appropriate soybean oil-in-water emulsion system to study the antioxidant activity of different type of propolis extracts. Emulsions were stored at room temperature and under magnetic stirring for the entire period of analysis (10 days). Lipid hydroperoxides were measured according to the method described by Shantha and Decker.1 The secondary oxidation products were determined as TBARS according to the method described by McDonald and Hultin.2 The surface of the emulsion droplets was varied by using different surfactants, sodium dodecyl sulphate (SDS) is an anionic emulsifier, whereas Tween 80 and Brij 35 are non ionic surfactants. The Tween 80-stabilized emulsion oxidation rate is lower than Brij 35 and SDS emulsions. Besides, the Tween 80 emulsion resulted to be more stable then the others and it was used to determine the effects of pH on lipid oxidation. The lipid oxidation rate of the Tween 80-stabilized emulsion was tested at pH 3.0 and 7.0. Oxidation rate increases with decreasing pH and the oxidation rate at pH 3.0 is more desirable since the oxidation rate at pH 7.0 is too much low. As a consequence, the Tween 80-stabilized emulsion at pH 3.0 has been chosen for our purpose. For each propolis extract (ethanolic, acetonic, chloroformic, etheric), 3 oil-in-water emulsions were prepared by adding 0.06 ml, 0.27 ml and 1 ml of extract into the oil phase. All the extracts show antioxidant activity which, in all cases except for the acetonic one, tends to increase with increasing the extract content. Instead, the ethanolic extract used at low level presents an evident pro-oxidant effect. The lowest content of acetonic extract is the most active as antioxidant
Capitolo 11: Aceto
No full textVengono elencate e descritte le principali analisi previste dalle normative vigenti sugli aceti
Valutazione dei costituenti principali di aceti balsamici tradizionali prodotti nella provincia di Modena
No full textThe composition properties of 14 barrels sets of aged Traditional Balsamic Vinegar were analysed to examine its production in Modena area. Different chemical parameters were valuated: total, fixed and volatile acidity, density, reducing sugars, glycerol and ethanol. Also proline, the main aminoacid in grape, and polyphenols, natural healthful substances with antioxidant properties, were determined. The obtained results showed a significant variability, related to the handmade procedure of vinegar processing. However these results were in agreement with data indicated in the last researches, corresponding to the typical chemical characteristics of this product
Valore nutrizionale della corniola, frutto del Cornus Mas L.
No full textVengono riportati i risultati relativi all'analisi del valore nutrizionale del Corniolo, nonchè di alcuni componenti funzionali quali fibra dietetica e sostanza fenoliche
Mercury and selenium contents in selected seafood
No full textThe mercury and selenium contents of fresh seafood were determined, respectively, by means of cold vapor atomic absorption spectroscopy (CVAAS) and hydride-generation atomic absorption spectrometry (HGAAS). All the values obtained were lower than the European Union ́s legal limit of 0.5 mg/kg fresh food, rising to 1.0 mg kg for the edible parts of some listed species; in fish they vary between 0.057 mg/kg in sole and 0.579 mg/kg in swordfish (included in the category of large fish, for which the legal limit is 1 mg/kg). The levels of selenium vary between 0.073 mg/kg in perch and 0.743 mg/kg in tuna. In shellfish the mercury content varies between 0.023 mg/kg in moscardino and 0.150 mg/kg in Mediterranean shrimp, while that of selenium varies between 0.067 mg/kg in spiny lobster and 0.605 mg/kg in mussels. A significant difference was found between fish and shellfish for mercury, but not for selenium. A large excess of selenium in relation to mercury was observed (the mean molar ratio of Hg/Se is 0.23 for fish and 0.09 for shellfish), but no significant correlation was found between the two elements
Valutazione dell'attività antiossidante di aceti balsamici
No full textL'attività antiossidante di campioni di Aceto balsamico tradizionale di Modena e di Aceto balsamico di Modena nonchè il contenuto di sostanze fenoliche sono stati valutati mediante metodi in vitro e spettrofotometrici
Determination of aluminium and zinc in infant formulas and infant foods
No full textSeven different infant formulas and 18 different types of infant foods representative of infant diets in italy were analyzed to gain further information about the composition of infant diets, with particular reference to Al and Zn intake. after a microwave mineralization pretreatment, A
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