1,721,009 research outputs found
Passive modified atmosphere packaging: shelf-life extension of blu molded cheeses packaged in polylactic acid trays
No full textA simplified model to forecast the evoluton of gases inside a food packaging, containing respiring cheeses was applied. Considering the interaction between blu molded cheeses and oxygen and the particular diffusion properties of a package entirely made with a compostable material (poly lactic acid), shelf-life of the cheeses seems to be possibly extended up to 4 weeks
Sensory effects of hexanal vapor on fresh-cut slices of golden delicious apples.
No full textHexanal is a natural antimicrobial molecule that characterizes apples aroma. In this paper, the sensory effects of hexanal, as a component of packaging atmosphere, on fresh sliced Golden Delicious apples after storage at 4 °C for 8 d were evaluated. In particular, a colorimetric analysis of slices treated with different concentrations of hexanal vapor (coming from 3.040 to 0.076 mmol of liquid aldehyde per liter of air) fixed at 0.076 mmol/L the amount of hexanal in evaluating sensory effects in the subsequent analysis. Color and texture evaluation of slices by Two-out-of-Five method did not highlight any significant difference between treatment and control. The results from olfactory evaluation showed instead that treated samples had an intense odor compared with those untreated (P < 0.001). A significant difference between treatment and control was also highlighted during the flavor evaluation (P < 0.01); however, from the panelists' observations it emerged that such an effect would work negatively. The positive effect of the tested dose of hexanal on the odor of Golden Delicious slices and its flavor acceptability were verified by using regular apple consumers. A significant preference (P < 0.001) for the odor of treated apple slices came out, so the small dose of hexanal intensifies the odor of apples pleasantly. The different flavor of treated samples was not identified by the consumers, who altogether expressed positive judgments about it. This suggests the nicety of this difference that in the absence of an untreated reference sample is very difficult to detect
Study of diffusion through LDPE film of di-n-butyl phthalate.
No full textThe apparent diffusion of PE-LD film of DnBP dissolved in isooctane and ethanol , were calculated in different ways and compared. The results demonstrated great solvent interference in the plasticizer diffusion across polyethylene
Bevande: permeabilità agli aromi di materiali plastici.
No full textL'articolo prende in esame le problematiche legate alla misura della permeabilità agli aromi dei polimeri plastici e tratta anche alcuni aspetti teorici del fenomen
Previsione delle variazioni di composizione delle atmosfere protettive in imballaggi permeabili
No full textA protective atmosphere in a flexible packaging can change its composition by means of gases interactions with the food components or gases diffusion through the container. Such diffusion corresponds both to permeability phenomena and to unselective diffusion through leaks in the material or package, while this last phenomenon can not be foreseen in any way, as it is completely occasional, permeability is largely predictable by the diffusional properties of the materials and internal atmosphere composition. In this work a computing procedure is proposed, which allows to predict the atmosphere evolution only on the basis of permeability phenomena, and are presented the tests that werecarried out to verify its reliability. The gaschromatographic analysis of the atmosphere changes, measured in packages closed with different gas compositions and produced with different materials and geometry, demonstrated the effectiveness of the iterative computing procedure suggested, which could represent an useful tool for optimising the package design in order to reach the best results in protective atmosphere packaging technology
Shelf-life Extension of Taleggio Cheese by Modified Atmosphere Packaging.
No full textapplication of modified atmophere packaging for the shlef-life extension of Taleggio chees
Trasferimenti di aeriformi (O2, CO2, vapor acqueo) attraverso la confezione permeabile di un prodotto vegetale fresco.
No full textSi ripprtano i risultati conseguiti in alcune esperienze preliminari condoptte su vegetali di IV gamma, nel corso delle quali si è valutata l'influenza reciproca delle prestazioni diffusionali dei materiali di confezionamento e del metabolismo respiratorio dei prodotti stessi
Effetto della direzione del flusso di vapore acqueo sulla misura della permeabilità.
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A Mathematical Model for the Prediction of Water Vapour Transmission Rate at Different Temperature and Relative Humidity Combinations.
No full textA simple mathematical procedure for the estimation of water vapour transmission rate under different conditions is presented and discussed. This procedure was applied to data collected for different thin films and good agreement was found between observed and predicted values for PET and LDPE films
Design of a functional box for take-away pizza. Packaging
No full textAim of this work was the design of a functional packaging able to maintian the good quality of take-away pizza, considering the particular needings of this product, in term of rigth consuption temperature
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