Hansen, Steffen Foss

Mackevica, Aiga

Olsson, Mikael Emil

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Dec 20, 2017Silver release from nano-silver containing plastic food containersMackevica, Aiga; Olsson, Mikael Emil; Hansen, Steffen FossPublication date:2014Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Mackevica, A., Olsson, M. E., & Hansen, S. F. (2014). Silver release from nano-silver containing plastic foodcontainers. Poster session presented at Nanotech 2014, Washington DC, United States.The potential migration of AgNP into food and during washing, scrubbing, etc. has been poorly addressed; however, it is essential for the purpose of human and environmental exposure assessment.  Experimental setup: Migration assay was set up following European Commission Directive 97/48/EC for articles intended to be in contact with food.  Four brands of commercially available plastic food containers were incubated for 10 days at 40ºC with three different food simulants: Milli-Q water, 10% ethanol, and 3% acetic acid.  Analysis: The total amount of silver in plastic containers (day 0) and migration solutions (day 10) was quantified by ICP-MS analysis. The size of the migrated particles was investigated by  • single particle ICP-MS (Agilent 7700x)  • TEM-EDS imaging (FEI Tecnai G2)   Introduction / Materials & Methods Silver release from nano-silver containing plastic food containers Aiga Mackevica*, Mikael Emil Olsson and Steffen Foss Hansen Technical University of Denmark, Department of Environmental Engineering Results – total silver migration Results – single particle ICP-MS Results – single particle ICP-MS Discussion / Conclusions Results – TEM-EDS *aima@env.dtu.dk This project has received funding from the European Union’s Seventh Framework Programme [FP7/2007-2013] under EC-GA No. 604305 ‘SUN’ Fresher Longer™  Milli Q The Original Always Fresh Containers™ 10% Ethanol Kinetic Go Green™ 3% Acetic acid • Highest migration of total silver was observed in acetic acid for all four brands  • Single particle ICP-MS results showed that in acetic acid there was more dissolved silver found than particulate silver  • The presence of AgNP was confirmed by TEM-EDS analysis for all acetic acid samples  • The brand with highest release of Ag (ng/cm2) was Special Nanosilver Mother’s milk pack from Jaco, Korea  • The highest content of Ag (per cm2) was measured for The Original Always Fresh Containers™ Fresher Longer™ Mother’s milk pack The Original Always Fresh Containers™ The Original Always Fresh Containers™ TEM Images obtained from migration solution samples after 10 days in 3%  acetic acid • EDS spectra confirmed that particles found consisted of Ag • Both dispersed and agglomerated particles were observed • AgNP sizes were ranging from around 20 nm to more than 200 nm Y axis truncated at 15 for size distribution graphs. Bin size = 10. Background and size distribution calculations performed as described by Pace et al. (2011) Analytical chemistry 83.24: 9361-9369. 0 2 4 6 8 10010002000300040005000 CuCuC AgAgAgEnergy (keV)CountsKinetic Go Green™ Kinetic Go Green™ EDS sepctrum from The Original Always Fresh Containers™ sample 0.00.51.01.52.02.53.03.5Milli Q EtOH Acetic Milli Q EtOH Acetic Milli Q EtOH Acetic Milli Q EtOH AceticSpecial Nanosilver Mother'smilk pack (Jaco, Korea)Fresher Longer™ Miracle Food Storage™ bags (Sharper Image, USA) Kinetic Go Green™ Premium Food Storage Containers (Kinetic, USA) The Original Always Fresh Containers™ (Gourmet Trends, USA)  Total Ag migration (ng/cm2) Spikes indicate that there are particles present Baseline represents the dissolved silver  (Milli-Q < EtOH < Acetic acid) The height of the peaks (intensity – counts/event) is relative to the particle size R a w  d a ta0 2 0 4 0 6 001 0 02 0 03 0 04 0 05 0 0T im e  (s )Intensity (counts/event)0 2 0 4 0 6 005 0 01 0 0 01 5 0 0T im e  (s )Intensity (counts/event)0 2 0 4 0 6 001 0 0 02 0 0 03 0 0 04 0 0 05 0 0 0T im e  (s )Intensity (counts/event)0 5 0 1 0 0 1 5 0 2 0 0051 01 5S iz e  (n m )Frequency1 0 0 1 5 0 2 0 0 2 5 0 3 0 0051 01 5S iz e  (n m )FrequencyDue to the dissolved silver the background peak is really broad making it difficult to obtain a good size distribution 5 0 1 0 0 1 5 0 2 0 0051 01 5S iz e  (n m )FrequencyFresher Longer™, Milli Q The Original Always Fresh Containers™, EtOH Kinetic Go Green™, Acetic acid Samples had very few particles (too dilute solutions) with great difference in sizes 

Silver release from nano-silver containing plastic food containers

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Silver release from nano-silver containing plastic food containers

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