In this work a comprehensive study on a new active packaging obtained by a hybrid organic–inorganic coating with antimicrobial properties was carried out. The packaging system based on polylactic acid was realised by sol–gel processing, employing tetraethoxysilane as a precursor of the inorganic phase and polyvinyl alcohol as the organic component, and incorporating natamycin as the active agent. Films with different organic–inorganic ratios (in a range between 1:19 and 1:4) were prepared, and the amount of antimycotic entrapped was found to be modulated by the sol composition, and was between 0.18 and 0.25 mg/dm2. FTIR microspectroscopic measurements were used to characterise the prepared coatings. The antifungal properties of the films were investigated against mould growth on the surface of commercial semi-soft cheese. The release of natamycin from the films to ethanol 50% (v/v) was studied by means of HPLC UV-DAD. The maximal level released was about 0.105 mg/dm2, which is far below the value allowed by legislation.
Natamycin based sol-gel antimicrobial coatings on polylactic acid films for food packaging / Lantano, C.; Alfieri, Ilaria; Cavazza, Antonella; Corradini, Claudio; Lorenzi, Andrea; Zucchetto, Nicola; Montenero, Angelo. - In: FOOD CHEMISTRY. - ISSN 0308-8146. - 165:(2014), pp. 342-347. [10.1016/j.foodchem.2014.05.066]
Natamycin based sol-gel antimicrobial coatings on polylactic acid films for food packaging
C. Lantano;ALFIERI, Ilaria;CAVAZZA, Antonella;CORRADINI, Claudio;LORENZI, Andrea;ZUCCHETTO, Nicola;MONTENERO, Angelo
2014-01-01
Abstract
In this work a comprehensive study on a new active packaging obtained by a hybrid organic–inorganic coating with antimicrobial properties was carried out. The packaging system based on polylactic acid was realised by sol–gel processing, employing tetraethoxysilane as a precursor of the inorganic phase and polyvinyl alcohol as the organic component, and incorporating natamycin as the active agent. Films with different organic–inorganic ratios (in a range between 1:19 and 1:4) were prepared, and the amount of antimycotic entrapped was found to be modulated by the sol composition, and was between 0.18 and 0.25 mg/dm2. FTIR microspectroscopic measurements were used to characterise the prepared coatings. The antifungal properties of the films were investigated against mould growth on the surface of commercial semi-soft cheese. The release of natamycin from the films to ethanol 50% (v/v) was studied by means of HPLC UV-DAD. The maximal level released was about 0.105 mg/dm2, which is far below the value allowed by legislation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
