Publication
Active polylactic acid film incorporated with green tea extract
| dc.contributor.author | Vilarinho, Fernanda | |
| dc.date.accessioned | 2019-02-19T15:14:09Z | |
| dc.date.available | 2019-02-19T15:14:09Z | |
| dc.date.issued | 2018-09 | |
| dc.description.abstract | The goal of this work was to produce a biodegradable active film based on polylactic acid (PLA) in which green tea extract (GTE) has been immobilized by extrusion, Two GTE concentrations were tested, 1% (w/w) and 2% (w/w). Four different GTEs were characterized regarding its antioxidant capacity, total phenolics content (TPC) and total flavonoids content (TFC). The commercial GTE chosen presented with highest antioxidant capacity by the DPPH radical assay (EC50= 0.12 ± 0.00 mg/mL) and highest TPC (416 ± 9.95 mg gallic acid equivalents (GAE)/g extract) being selected to be incorporated in the active film. The new film was to evaluated regarding its mechanical properties (e.g. tensile strength decreased 12% with the incorporation of GTE in the PLA matrix and strain at break increased 9.6% and 36% with the addition of 1% and 2% of GTE, respectively), water vapour transmission rate (water-vapour barrier properties improved with the addition of higher amounts of GTE) and effectiveness to inhibit lipid oxidation of model food. Smoked salmon was selected due to be a much appreciated high-fat content food with considerable high value in the market. The methods applied were: peroxide value, p-anisidine value, thiobarbituric acid reactive substances (TBARS) assay and hexanal monitoring, after packaging smoked salmon slices during different storage times (0, 7, 15, 30, 45 and 60 days). According to the results, the incorporation of GTE in the PLA films protects the smoked salmon from lipid oxidation in the different storage times tested. However, further studies should be performed to better understand the GTE mechanism of action as the results indicate a pro-oxidant effect of PLA/GTE 2% after 60 days of storage and to evaluate the potential antimicrobial activity of active films. To our information, this is the first time that an active PLA film containing GTE is evaluated regarding mechanical and barrier properties as well as its effectiveness in inhibiting lipid oxidation of smoked salmon. | pt_PT |
| dc.description.version | N/A | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10400.18/5896 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.subject | Active Packaging | pt_PT |
| dc.subject | Polylactic Acid | pt_PT |
| dc.subject | Green Tea Extract | pt_PT |
| dc.subject | Antioxidant Capacity | pt_PT |
| dc.subject | Smoked Salmon | pt_PT |
| dc.subject | Lipid Oxidation | pt_PT |
| dc.subject | Active Packaging | pt_PT |
| dc.subject | Segurança Alimentar | pt_PT |
| dc.title | Active polylactic acid film incorporated with green tea extract | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Sorrento-Salerno, Itália | pt_PT |
| oaire.citation.title | IFT-EFFoST 2018 International Nonthermal Processing Workshop and Short course, 25-27 September 2019 | pt_PT |
| rcaap.rights | embargoedAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
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