Migration Research Of Food Contact Nanomaterials And Antimicrobial Property Of Nano-Silver

Nano-silver and nano-zinc oxide has been widely used in the field of food packaging because of its excellent properties,such as antibacterial,freshness and so on.However,nanoparticles may migrate into food through the food contact packaging materials and cause a safety hazard.In this paper,the research methods of food packaging materials and nanotechnology were combined to assess the migration of nano-silver and nano-zinc oxide added in food contact materials.For the migration of the multi angle study on food contact nanomaterials,four kinds of food contact functional materials with addition of nano-silver were purchased and the different materials,different sizes of nano-zinc oxide food contact functional materials were produced as research object.Respectively of nano additives product content and the morphology and particle size of detection and analysis,and between the temperature of 25? to 100? and a series of immersion time,the experimental conditions of experimental products for migration experiments and quantitative detection by inductively coupled plasma mass spectrometry(ICP-MS),atomic absorption spectrometer(AAS),qualitative analysis and particle size measurement by scanning electron microscopy(SEM/EDS)and Malvern nanoparticle size analyzer.This article analyzes the condition of nano size,plastic material,soaking solution,reaction temperature,and contact time respectively on food contact functional material with addition of nano-silver and nanometer oxide zinc mobility impact assessment and Analysis on the migration of nano-silver and nano-zinc oxide.The main research contents and results are as follows:(1)The migration content of nano-silver in four kinds of packaging materials were measured by inductively coupled plasma mass spectrometry(ICP-MS).The results showed that the nano-silver content in nano-silver boxes(PP)and nano-silver bottles(PES)materials were more,respectively 30.01?g/g plastic and 27.24?g/g plastics,however,the nano-silver content in nano-silver milk storage bags(PET+PE)and nano-silver blocks(PE)materials were less.Four kinds of materials migration results showed that nano-silver boxes(PP)of silver nanoparticles in maximum amount of migration,0.087?g/m L,nano-silver migration quantity of nano-silver milk storage bag(PET + PE)minimum is only 0.008?g/mL.(2)According to the national standard on food contact with nano-silver materials for migration research,results showed that food simulant liquid kinds of packing materials added nano-silver migration have obvious influence,the silver nanoparticles in oil food simulating liquid is hexane in the maximum amount of migration,the in water food simulant,distilled water migration is the minimum;temperature and contact time were on nano-silver migration in the packaging material impact,that is soaked in the same simulation conditions,higher temperature and longer soaking time will caused by the packaging materials are nano-silver migration quantity is higher.By scanning electron microscopy(SEM/EDS)and Malvern nanoparticles size instrument on the migration of size and shape analysis,results showed that nano-silver migration,most of them were spherical and together,silver nano particle size range from tens to hundreds of nanometers ranging,the average particle size is about 364.6nm.(3)The self-made food contact nano coating on zinc oxide was used to study the migration of nano-zinc oxide.The results showed that significantly affect the migration of coating nanoparticles from zinc oxide,when the particle size is more than 100 nm,the migration amount of nano-zinc oxide increases obviously,and the bigger diameter of migration was larger.No effect on migration of matrix material nano-zinc oxide.(4)Commercially available nano-zinc oxide food packaging(PP)migration research.Results show that the simulation of migration of nano food liquid zinc oxide has more obvious effects,the migration amount of nano-zinc oxide in n-hexane and 4% acetic acid in a relatively large amount of migration,in water is very low.By increasing the temperature and prolonging the soaking time,the migration amount of nano-zinc oxide added in packaging materials will increase,but to a lesser extent.Using scanning electron microscope(SEM/EDS)and nanoparticle size analyzer on transport properties such as morphology,particle size analysis,the results showed that nano-zinc oxide was ranging from the size of the columnar morphology.Multiple polymerization together.The particle size between 50 nm to 400 nm.(5)Discussion of the biology of nano-silver materials.Study on antibacterial properties in this chapter is currently the most widely used silver nanoparticles,analysis of antibacterial activity of 35 nm silver nanoparticles on Escherichia coli and Staphylococcus aureus.The study found that silver nanoparticles on Staphylococcus aureus and Escherichia coli have obvious antibacterial and nano-silver particles on Staphylococcus aureus antibacterial ability was significantly higher than that of antibacterial ability to Escherichia coli.