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Passarinho A.T.P.,Federal University of Ouro Preto | Dias N.F.,Federal University of Vicosa | Camilloto G.P.,State University of Feira de Santana | Cruz R.S.,State University of Feira de Santana | And 4 more authors.
Journal of Food Process Engineering | Year: 2014

Traditional packaging concepts are reaching their limits in enhancing food safety, quality and shelf life. Active, antimicrobial sachets containing different concentrations of oregano essential oil (OEO) were developed, and their antimicrobial efficiency was evaluated on agar medium - against Escherichia coli, Salmonella Enteritidis and Penicillium sp. - and on sliced bread - against yeasts and molds. Residual OEO on treated bread was quantified by gas chromatography-mass spectrometry. Bread slices were also evaluated as to texture and sensory properties. Sachets containing OEO showed in vitro antimicrobial effect against the tested microorganisms, as well as reduced the growth rates of yeasts and molds on sliced bread. Compared with untreated samples, γ-terpinene and ρ-cymene contents on treated bread increased throughout storage, whereas their acceptance was reduced. Our findings indicate the potential application of antimicrobial sachets as an antimicrobial packaging system for sliced bread preservation. © 2014 Wiley Periodicals, Inc. Source


Steffens C.,National Nanotechnology Laboratory for Agribusiness Embrapa Instrumentation | Steffens C.,URI Integrated Regional University Brazil | Manzoli A.,National Nanotechnology Laboratory for Agribusiness Embrapa Instrumentation | Paschoalin R.T.,National Nanotechnology Laboratory for Agribusiness Embrapa Instrumentation | And 5 more authors.
Synthetic Metals | Year: 2013

In this paper tracing paper was used as the support on which interdigitated graphite electrodes (IGE) were deposited by a line patterning technique (LPT). This substrate was characterized before and after the patterning procedure by thermogravimetric analysis, atomic force microscopy (AFM) and field emission scanning electron microscopy (FE-SEM). The performance of the IGEs prepared by LPT as humidity sensors were evaluated in an electronic nose system, under different humidities (in triplicate) at room pressure and temperature in a closed chamber. The relative humidity (RH) in the chamber was varied from 20 to 70% using dry nitrogen as a carrier gas, which was passed through a bubbler containing water to generate humidity. Slight changes in the morphology of the tracing paper were noted after the processes used to produce the IEG, but these changes did not prevent these sensors performing well under varied environmental conditions, as part of an electronic nose system to detect humidity. The results showed that humidity sensors were sensitive (215% ± 1.02) and provided good repeatability and reversibility (99% ± 0.01) after several cycles of exposure to RH. © 2013 Elsevier B.V. All rights reserved. Source


Tiggemann L.,URI Integrated Regional University Brazil | Ballen S.,URI Integrated Regional University Brazil | Bocalon C.,URI Integrated Regional University Brazil | Graboski A.M.,URI Integrated Regional University Brazil | And 5 more authors.
Journal of Food Engineering | Year: 2016

A low-cost gas placement has been designed to detect different artificial fruit aromas (apple, grape and strawberry). The sensors have been developed through polyaniline deposition using in situ polymerization technique on the inter-digitated area of the graphite electrode, which was accomplished using the line-patterning technique over tracing paper substrate. The sensitivity, reversibility, response time, hysteresis and electronic nose system detection limit have all been evaluated using different fruit aromas (apple, grape and strawberry), under controlled temperature and humidity conditions. The sensitivity decreased gradually as the storage period increased. It was possible to notice that the gas sensors presented high sensitivity and reversibility during the three analyzed cycles on apple, grape and strawberry aromas as well as the detection limit that was lower than 0.62 ppm. Therefore, it demonstrated the potential electronic nose systems have using low-cost gas sensors with polyaniline film in the evaluation of commercially prospected aromas. © 2016 Elsevier Ltd. All rights reserved. Source

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