首页|Effect of active rice straw extracts on the properties and migration of PHBV films
Effect of active rice straw extracts on the properties and migration of PHBV films
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NETL
NSTL
Elsevier
Rice straw extracts (RSE) were obtained by subcritical water extractions at 160 ℃ (RSE160) and 180 ℃(RSE180). These extracts were analysed as to the main components, phenol content and formation of 5-Hydroxymethylfurfural(5-(hydroxymethyl)furan-2-carbaldehyde (HMF). These were incorporated (6 % wt.) into PHBVfilms by melt blending and compression moulding. Films were characterised as to their physical properties,structural and thermal behaviour, and overall and specific migration of the phenols and HMF in different foodsimulants. Thermal processing of the films led to a partial degradation of the extracted sugars, producing microholesin the matrix and HMF formation. The RSE slightly reduced the polymer crystallinity, the film stretchability,fracture resistance, and barrier capacity to water vapour and limonene, but improved the oxygen barrierof the films and enhanced their UV light barrier due to the phenol content and antioxidant capacity. The PHBVmigration did not reach the overall migration limit (10 mg/dm~2) in any simulant while the specific migration ofphenols and HMF depended on the food simulant and its concentrations in the films. The near total release of thephenols present in the films was achieved in less polar simulants, equivalent to 30–40 mg GAE/kg of packagedfood, for RSE180 films. HMF was mainly released in acidic simulants and those containing ethanol, reaching amaximum value of 0.36 mg/kg, for RSE180 films in which more HMF was formed. This value was much lowerthan those HMF levels found in many commonly-consumed foods. Therefore, the materials can be consideredsafe for food packaging.
Rice straw extractPHBVPhenolic compoundsMigrationValorisation of agri-food waste, HMF
Eva Moll、Pedro A.V. Freitas、Amparo Chiralt
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Instituto Universitario de Ingenieria de Alimentos-Food UPV, Universitat Politecnica de Valencia, Cami de Vera s/n, Valencia 46022, Spain
NETL
NSTL
Elsevier
