Partition and diffusion experiments were carried out with paper and board samples coated with different biopolymers. The aim was to evaluate the physicochemical behaviour and barrier properties of bio-coatings against migration of typical contaminants from recycled paper packaging. Focus was directed towards water-based, renewable biopolymers, such as modified starches (cationic starch and cationic waxy starch), plant and animal proteins (gluten and gelatine), poured onto paper with an automatic applicator. Additionally, a comparison with polyethylene-laminated paper was performed. Microstructural observations of the bio-coated paper allowed the characterisation of samples. From the partitioning studies, considerable differences in the adsorption behaviour of the selected contaminants between bio-coated or uncoated paper and air were highlighted. For both the polar and non-polar compounds considered (benzophenone and diisobutyl phthalate, respectively), the lowest values of partition coefficients were found when paper was bio-coated, making it evident that biopolymers acted as chemical/physical barriers towards these contaminants. These findings are discussed considering the characteristics of the tested biopolymers. Diffusion studies into the solid food simulant poly 2,6-diphenyl-p-phenylene oxide, also known as Tenax(®), confirmed that all the tested biopolymers slowed down migration. The Weibull kinetic model was fitted to the experimental data to compare migration from paper and bio-coated paper. Values found for β, an index determining the pattern of curvature, ranged from 1.1 to 1.7 for uncoated and polyethylene paper, whereas for bio-coated papers they ranged from 2.2 to 4.9, corresponding to the presence of an evident lag phase due to barrier properties of the tested bio-coatings.
Bio-based coatings as potential barrier to chemical contaminants from recycled paper and board packaging / V. Guazzotti, L. Piergiovanni, A. Marti, S. Limbo. - In: FOOD ADDITIVES & CONTAMINANTS. PART A. CHEMISTRY, ANALYSIS, CONTROL, EXPOSURE & RISK ASSESSMENT. - ISSN 1944-0049. - 31:3(2014 Mar), pp. 402-413.
|Titolo:||Bio-based coatings as potential barrier to chemical contaminants from recycled paper and board packaging|
GUAZZOTTI, VALERIA (Primo)
PIERGIOVANNI, LUCIANO (Penultimo)
MARTI, ALESSANDRA (Secondo)
LIMBO, SARA (Corresponding)
|Parole Chiave:||bio-based coating; diffusion; food contact materials; functional barrier; migration modelling; packaging; paper and board|
|Settore Scientifico Disciplinare:||Settore AGR/15 - Scienze e Tecnologie Alimentari|
|Data di pubblicazione:||mar-2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1080/19440049.2013.869360|
|Appare nelle tipologie:||01 - Articolo su periodico|