Food packaging: usage features and processing

The article deals with the peculiarities of polymer packaging for food products, as well as the possible risks that arise in the process of use and its processing. The Aim of the Article. Determine the toxic substances of the packaging component composition and carry out comprehensive analytical control on the content of priority pollutants to prevent adverse effects on food products, the environment, the human body, and outline the possible risks of polymeric food packaging recycling. Methods and Materials. To identify and define the levels of chemical substances and toxic elements migration from different polymeric material types and products from them. The methods of gas chromatography, high performance liquid chromatography, atomic absorption spectrophotometry, mass-spectrometry were applied using modern validated methods. Results and Discussion. According to the results of the researches, it is established that a large group of chemicals gets from the polymeric packaging to the contacting media, and in some cases their number exceeds the hygienic standard – ANM (acceptable number of migration). The increase in the number of chemicals migrating from the packaging material, as well as the levels of content of new excipients (dyes, decomposition products, impurities) that are formed after recycling of polymeric materials, is evidenced by the results of many research works. Conclusions. Careful monitoring of the migration levels of toxic components from different types of packaging materials and products into contact media should be carried out to assess the risks and their negative effects on food and human health. At the legislative level, control over the processing of plastic packaging for food should also be realized, taking into account the possibility of the formation of new chemicals and toxic elements. Key Words: packaging, safety, food products, risks.

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A Recommender System for Inverse Design of Polycarbonates and Polyesters

10.26434/chemrxiv.12679031 ◽

2020 ◽

Author(s):

Nathaniel Park ◽

Dmitry Yu. Zubarev ◽

James L. Hedrick ◽

Vivien Kiyek ◽

Christiaan Corbet ◽

...

Keyword(s):

Ring Opening ◽

High Performance ◽

Recommendation System ◽

Polymeric Materials ◽

Monomer Conversion ◽

Design Strategy ◽

Ring Opening Polymerization ◽

Inverse Design ◽

False Negatives ◽

Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

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High-Performance Polymeric Materials

10.21236/ada203945 ◽

1987 ◽

Author(s):

J. E. Mark

Keyword(s):

High Performance ◽

Polymeric Materials

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Mitigation of potentially toxic elements (PTEs) in food products by probiotic bacteria: a comprehensive review

Food Research International ◽

10.1016/j.foodres.2021.110324 ◽

2021 ◽

pp. 110324

Author(s):

Adel Mirza Alizadeh ◽

Hedayat Hosseini ◽

Neda Mollakhalili Meybodi ◽

Fataneh Hashempour-Baltork ◽

Mahmood Alizadeh-Sani ◽

...

Keyword(s):

Toxic Elements ◽

Food Products ◽

Potentially Toxic Elements ◽

Probiotic Bacteria ◽

Comprehensive Review

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Nanocomposites Materials of PLA Reinforced with Nanoclays Using a Masterbatch Technology: A Study of the Mechanical Performance and Its Sustainability

Polymers ◽

10.3390/polym13132133 ◽

2021 ◽

Vol 13 (13) ◽

pp. 2133

Author(s):

Helena Oliver-Ortega ◽

Josep Tresserras ◽

Fernando Julian ◽

Manel Alcalà ◽

Alba Bala ◽

...

Keyword(s):

Food Packaging ◽

Mechanical Performance ◽

Polymeric Materials ◽

Barrier Properties ◽

Food Tray ◽

Environmental Concerns ◽

Poly Lactic Acid ◽

The Matrix ◽

Surface Modified ◽

Being Moved

Packaging consumes around 40% of the total plastic production. One of the most important fields with high requirements is food packaging. Food packaging products have been commonly produced with petrol polymers, but due to environmental concerns, the market is being moved to biopolymers. Poly (lactic acid) (PLA) is the most promising biopolymer, as it is bio-based and biodegradable, and it is well established in the market. Nonetheless, its barrier properties need to be enhanced to be competitive with other polymers such as polyethylene terephthalate (PET). Nanoclays improve the barrier properties of polymeric materials if correct dispersion and exfoliation are obtained. Thus, it marks a milestone to obtain an appropriate dispersion. A predispersed methodology is proposed as a compounding process to improve the dispersion of these composites instead of common melt procedures. Afterwards, the effect of the polarity of the matrix was analyzing using polar and surface modified nanoclays with contents ranging from 2 to 8% w/w. The results showed the suitability of the predispersed and concentrated compound, technically named masterbatch, to obtain intercalated structures and the higher dispersion of polar nanoclays. Finally, the mechanical performance and sustainability of the prepared materials were simulated in a food tray, showing the best assessment of these materials and their lower fingerprint.

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Molecular materials for micro-electronics

Canadian Journal of Physics ◽

10.1139/p00-033 ◽

2000 ◽

Vol 78 (3) ◽

pp. 231-241 ◽

Cited By ~ 3

Author(s):

M D'Iorio

Keyword(s):

High Performance ◽

Organic Materials ◽

Coming Of Age ◽

Polymeric Materials ◽

Organic Light Emitting Diodes ◽

Light Emitting ◽

Light Emitting Devices ◽

Plastic Electronics ◽

Organic Light ◽

Recent Developments

Molecular organic materials have had an illustrious past but the ability to deposit these as homogeneous thin films has rejuvenated the field and led to organic light-emitting diodes (OLEDs) and the development of an increasing number of high-performance polymers for nonlinear and electronic applications. Whereas the use of organic materials in micro-electronics was restricted to photoresists for patterning purposes, polymeric materials are coming of age as metallic interconnects, flexible substrates, insulators, and semiconductors in all-plastic electronics. The focus of this topical review will be on organic light-emitting devices with a discussion of the most recent developments in electronic devices.PACS Nos.: 85.60Jb, 78.60Fi, 78.55Kz, 78.66Qn, 73.61Ph, 72.80Le

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Optical Properties of Polypropylene upon Recycling

The Scientific World JOURNAL ◽

10.1155/2013/354093 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 7

Author(s):

Felice De Santis ◽

Roberto Pantani

Keyword(s):

Optical Properties ◽

Rheological Properties ◽

Isotactic Polypropylene ◽

Food Packaging ◽

Polymeric Materials ◽

Optical Characteristics ◽

Cooling Rates ◽

Commercial Grade

In the last few years there has been an increasing interest in the possibility of recycling polymeric materials, using physical recycling. However, is it well known that polymers experience a depletion of all the properties upon recycling. These effects have been widely characterized in the literature for what concerns the mechanical or rheological properties. The changes of optical properties after recycling have been much less studied, even if, especially in food packaging, optical characteristics (above all the opacity) are of extreme importance, and thus it is quite significant to assess the effect of recycling on these properties. In this work, the influence of recycling steps on the opacity of films of a commercial grade of isotactic polypropylene (i-PP) was studied. The material was extruded several times to mimic the effect of recycling procedures. After extrusion, films were obtained by cooling samples of material at different cooling rates. The opacity of the obtained films was then measured and related to their crystallinity and morphology. It was found that opacity generally increases on increasing the amount ofαphase and for the same amount ofαphase on increasing the size of the spherulites.

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Assessment of concentrations of toxic elements in aquaculture food products in Malaysia

Food Chemistry ◽

10.1016/j.foodchem.2012.02.011 ◽

2012 ◽

Vol 133 (4) ◽

pp. 1326-1332 ◽

Cited By ~ 32

Author(s):

Wen Jye Mok ◽

Shigeharu Senoo ◽

Tomohiro Itoh ◽

Yasuyuki Tsukamasa ◽

Ken-ichi Kawasaki ◽

...

Keyword(s):

Toxic Elements ◽

Food Products

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Use of a flow-injection sample manipulator as an interface between a "high-performance" liquid chromatograph and an atomic absorption spectrophotometer.

Clinical Chemistry ◽

10.1093/clinchem/27.9.1546 ◽

1981 ◽

Vol 27 (9) ◽

pp. 1546-1550 ◽

Cited By ~ 3

Author(s):

B W Renoe ◽

C E Shideler ◽

J Savory

Keyword(s):

Atomic Absorption ◽

Flow Injection ◽

Metal Binding ◽

High Performance ◽

Atomic Absorption Spectrophotometry ◽

Clinical Samples ◽

High Performance Liquid Chromatograph ◽

Liquid Chromatograph ◽

Flame Atomic Absorption ◽

Column Eluate

Abstract We describe an integrated, molecular-absorbance, atomic absorption instrument for studying metal/ligand binding in clinical samples. For an interface between the "high-performance" liquid chromatograph and the atomic absorption instrument we used a flow-injection sample manipulator, thus allowing both the chromatograph and the atomic absorption detector to operate at their separate optimum conditions. After specimen separation with a gel permeation column, we measured the molecular components of the column eluate by molecular absorbance spectrometry and the atomic components (calcium and magnesium) by flame atomic absorption spectrophotometry. This instrument system is capable of separating and analyzing multiple components within 20 min of injection of the sample on the column. The chromatograms presented demonstrate the utility of the system for investigating metal binding to a variety of ligands in clinical samples.

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