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Mustatea G.,Polytechnic University of Bucharest | Mustatea G.,National Research and Development Institute for Food Bioresources IBA Bucharest | Vidal L.,CNRS Mulhouse Institute of Materials Science | Calinescu I.,Polytechnic University of Bucharest | And 3 more authors.
Journal of Nanoparticle Research | Year: 2015

Plasmonic silver film was directly generated on a variety of substrates through a facile and environmentally friendly method, which involves a UV-photoreduction process without any reducing or stabilizing agent and requiring no thermal step. Top-coated films of unprotected silver nanoparticles (3–11 nm) were generated from hydroalcoholic AgNO3 solution and directly on glass substrates or food packaging plastic wraps, low density polyethylene film, and polyvinyl chloride. The natural antibacterial activity of the material was evaluated. The correlation between silver migration and antimicrobial activity of silver-functionalized substrates against pure strains of gram-negative bacteria (Escherichia coli) and gram-positive bacteria (Staphylococcus aureus) was demonstrated. By way of illustration, food plastic wraps top-coated in this way exhibited a high antibacterial activity. The metal nanoparticle film obtained in this way was characterized and the influence of several parameters (fluence, exposure, silver nitrate concentration, and nature of the free radicals generator) on their formation was studied. Moreover, by shaping the actinic beam with an appropriate device, it is very easy to pattern the brown yellow silver nanofilm or to print messages in plain text. © 2015, Springer Science+Business Media Dordrecht. Source


Pruteanu E.,University of Bucharest | Niculita P.,University of Bucharest | Catana L.,National Research and Development Institute for Food Bioresources IBA Bucharest | Catana M.,National Research and Development Institute for Food Bioresources IBA Bucharest | And 3 more authors.
Romanian Biotechnological Letters | Year: 2013

Dioxins (polychlorinated dibenzo-p-dioxins - PCDD) and furans (polychlorinated dibenzofurans - PCDF) are highly toxic chemical compounds which can accumulate into human and animal bodies, causing many diseases with high risk for consumers health. In this paper are presented the results of the performed experiments for dioxins and furans determination from eggs obtained in conventional and uncertified ecological systems using high resolution gas chromatography coupled to high resolution mass spectrometry. The obtained results, expressed as WHO-PCDD/F-TEQ pg/g fat, revealed that in both cases the values were in the limits set by the Commission Regulation (EU) No. 1259/2011 (below 2,5 pg WHO-PCDD/F-TEQ/g fat). © 2013 University of Bucharest. Source

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