Mono and multilayer active films containing green tea to extend food shelf life

Vieira, Dalila M.; Andrade, Mariana; Vilarinho, Fernanda; Sanches Silva, Ana; Rodrigues, Pedro; Castro, M. Cidália; Machado, Ana Vera

http://hdl.handle.net/10400.18/8502

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Abstract(s)

An active packaging film made of one and two-layers structure based on low-density polyethylene (LDPE) was produced with the incorporation of green tea extract (GTE) at different amounts by blown film extrusion. Film structure, optical, mechanical, antioxidant and barrier properties were characterized. The films revealed homogeneous film surface, the presence of GTE increases the tensile properties, improves friction coefficient and reduces LDPE films transparency. Moreover, the antioxidant capacity and barrier properties (water and oxygen) were enhanced, even at low concentrations. This study demonstrates the benefits of GTE incorporation into LDPE matrix, mainly in coextruded films, and its potential to develop an active and sustainable food packaging film at industrial scale.

Highlights: Extrusion of active mono and two-layers films of LDPE and GTE; The incorporation of GTE increases the hydrophobicity of the active films; Antioxidant capacity and barrier properties enhanced with GTE addition; LDPE/GTE can be produced in industry using commercial blown-film extrusion lines.