Functional barriers are multilayer structures deemed to prevent migration of some chemicals released by food-contact materials into food. In the area of plastics packaging, different migration behaviours of mono- and multilayer structures are assessed in terms of lag time and of their influence of the solubility of the migrants in food simulants. Whereas barriers to oxygen or to aromas must prevent the diffusion of these compounds under conditions of use, a functional barrier must also be efficient under processing conditions, to prevent diffusion of substances when the polymer layers are in contact at high (processing) temperatures. Diffusion in melted polymers at high temperatures is much slower for glassy polymers, than in polymers that are rubbery at ambient temperature. To evaluate the behaviour of functional barriers under conditions of use, a set of reference diffusion coefficients in the 40-60 degrees C range were determined for 14 polymers. Conditions for accelerated migration tests are proposed based on worst-case activation energy in the 40-60 degrees C range. For simulation of migration, numerical models are available. The rules derived from the models can be used both by industry (to optimize a material in terms of migration) or by risk assessors. Differences in migration behaviour between mono- and multilayer materials are discussed.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1080/02652030500227776 | DOI Listing |
Scand J Gastroenterol
January 2025
Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Xiamen Branch, Xiamen, China.
Background: Evaluate the clinical significance of esophagogastric junction (EGJ) morphology and esophagogastric junction contractile integral (EGJ-CI) in refractory gastroesophageal reflux disease (RGERD) patients.
Methods: From June 2021 to June 2023, 144 RGERD patients underwent comprehensive evaluation, recording symptom scores, demographic data. GERD classification (NERD or RE, A-D) was based on endoscopic findings.
Biosci Microbiota Food Health
August 2024
Department of Food Science, Széchenyi István University, Mosonmagyaróvár, 9200, Hungary.
The global probiotics market has been continuously growing, driven by consumer demand for immune-enhancing functional foods, dietary supplements, and natural therapeutics for gastrointestinal and gut function-mediated diseases. Probiotic microorganisms represent a diverse group of strains with complex but generalized mechanistic patterns. This review describes the various immunomodulatory mechanisms by which probiotics exert their effects, including the competitive exclusion of pathogenic microbes, production of antimicrobial substances, modulation of the immune system, and improvement of gut barrier function.
View Article and Find Full Text PDFBiosci Microbiota Food Health
August 2024
Department of Microecology, College of Basic Medical Sciences, Dalian Medical University, Dalian 116044, PR China.
Beer contains a variety of bioactive ingredients and trace elements that can regulate bodily functions, and moderate consumption of beer can enhance immune responses. This study aimed to investigate the potential benefits of moderate consumption of alcoholic or non-alcoholic beer on the gut microbiome, immunity, and intestinal barrier function in immunosuppressed BALB/c mice induced by cyclophosphamide (CTX). Model mice with CTX-induced immunosuppression were administered alcoholic or non-alcoholic beer or galacto-oligosaccharides (GOS) for 28 consecutive days.
View Article and Find Full Text PDFCureus
January 2025
Department of Physiology, University of Sindh, Jamshoro, PAK.
Background: Erectile dysfunction (ED) in men is overlooked and is often linked with psychogenic causes. Due to cultural barriers, this area of research remains neglected.
Objective: The study was conducted to determine the factors that can be associated with ED in otherwise apparently healthy men.
Ital J Food Saf
December 2014
Dipartimento di Scienze e Tecnologie Agro-Alimentari, Università degli Studi di Bologna, Italy.
In the present study the effect of ultra-violet (UV) treatment alone and in combination with 100% CO modified atmosphere packaging (MAP) was evaluated both on the survival of naturally occurring bacteria, as well as on quality parameters of table eggs during 28 days of storage at 21°C. Table eggs were collected from the conveyor belt after the UV module, and placed on carton trays. A representative number of carton trays were packed in a high barrier multilayer pouch filled with 100% CO.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!