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Development of new antioxidant active packaging films based on ethylene vinyl alcohol copolymer (EVOH) and green tea extract.
J Agric Food Chem. 2011 Jul 27; 59(14):7832-40.JA

Abstract

Ethylene vinyl alcohol copolymer (EVOH) films containing green tea extract were successfully produced by extrusion. The films were brown and translucent, and the addition of the extract increased the water and oxygen barrier at low relative humidity but increased the water sensitivity, the glass transition temperature, and the crystallinity of the films and improved their thermal resistance. An analysis by HPLC revealed that the antioxidant components of the extract suffered partial degradation during extrusion, reducing the content of catechin gallates and increasing the concentration of free gallic acid. Exposure of the films to various food simulants showed that the liquid simulants increased their capacity to reduce DPPH(•) and ABTS(•+) radicals. The release of green tea extract components into the simulant monitored by HPLC showed that all compounds present in the green tea extract were partially released, although the extent and kinetics of release were dependent on the type of food. In aqueous food simulants, gallic acid was the main antioxidant component released with partition coefficient values ca. 200. In 95% ethanol (fatty food simulant) the K value for gallic acid decreased to 8 and there was a substantial contribution of catechins (K in the 1000 range) to a greatly increased antioxidant efficiency. Kinetically, gallic acid was released more quickly than catechins, owing to its faster diffusivity in the polymer matrix as a consequence of its smaller molecular size, although the most relevant effect is the plasticization of the matrix by alcohol, increasing the diffusion coefficient >10-fold. Therefore, the materials here developed with the combination of antioxidant substances that constitute the green tea extract could be used in the design of antioxidant active packaging for all type of foods, from aqueous to fatty products, the compounds responsible for the protection being those with the higher compatibility with the packaged product.

Authors+Show Affiliations

Instituto de Agroquímica y Tecnología de Alimentos, Paterna, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21682295

Citation

Lopez de Dicastillo, Carol, et al. "Development of New Antioxidant Active Packaging Films Based On Ethylene Vinyl Alcohol Copolymer (EVOH) and Green Tea Extract." Journal of Agricultural and Food Chemistry, vol. 59, no. 14, 2011, pp. 7832-40.
Lopez de Dicastillo C, Nerin C, Alfaro P, et al. Development of new antioxidant active packaging films based on ethylene vinyl alcohol copolymer (EVOH) and green tea extract. J Agric Food Chem. 2011;59(14):7832-40.
Lopez de Dicastillo, C., Nerin, C., Alfaro, P., Catala, R., Gavara, R., & Hernandez-Munoz, P. (2011). Development of new antioxidant active packaging films based on ethylene vinyl alcohol copolymer (EVOH) and green tea extract. Journal of Agricultural and Food Chemistry, 59(14), 7832-40. https://doi.org/10.1021/jf201246g
Lopez de Dicastillo C, et al. Development of New Antioxidant Active Packaging Films Based On Ethylene Vinyl Alcohol Copolymer (EVOH) and Green Tea Extract. J Agric Food Chem. 2011 Jul 27;59(14):7832-40. PubMed PMID: 21682295.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development of new antioxidant active packaging films based on ethylene vinyl alcohol copolymer (EVOH) and green tea extract. AU - Lopez de Dicastillo,Carol, AU - Nerin,Cristina, AU - Alfaro,Pilar, AU - Catala,Ramon, AU - Gavara,Rafael, AU - Hernandez-Munoz,Pilar, Y1 - 2011/06/24/ PY - 2011/6/21/entrez PY - 2011/6/21/pubmed PY - 2011/11/11/medline SP - 7832 EP - 40 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 59 IS - 14 N2 - Ethylene vinyl alcohol copolymer (EVOH) films containing green tea extract were successfully produced by extrusion. The films were brown and translucent, and the addition of the extract increased the water and oxygen barrier at low relative humidity but increased the water sensitivity, the glass transition temperature, and the crystallinity of the films and improved their thermal resistance. An analysis by HPLC revealed that the antioxidant components of the extract suffered partial degradation during extrusion, reducing the content of catechin gallates and increasing the concentration of free gallic acid. Exposure of the films to various food simulants showed that the liquid simulants increased their capacity to reduce DPPH(•) and ABTS(•+) radicals. The release of green tea extract components into the simulant monitored by HPLC showed that all compounds present in the green tea extract were partially released, although the extent and kinetics of release were dependent on the type of food. In aqueous food simulants, gallic acid was the main antioxidant component released with partition coefficient values ca. 200. In 95% ethanol (fatty food simulant) the K value for gallic acid decreased to 8 and there was a substantial contribution of catechins (K in the 1000 range) to a greatly increased antioxidant efficiency. Kinetically, gallic acid was released more quickly than catechins, owing to its faster diffusivity in the polymer matrix as a consequence of its smaller molecular size, although the most relevant effect is the plasticization of the matrix by alcohol, increasing the diffusion coefficient >10-fold. Therefore, the materials here developed with the combination of antioxidant substances that constitute the green tea extract could be used in the design of antioxidant active packaging for all type of foods, from aqueous to fatty products, the compounds responsible for the protection being those with the higher compatibility with the packaged product. SN - 1520-5118 UR - https://www.unboundmedicine.com/medline/citation/21682295/Development_of_new_antioxidant_active_packaging_films_based_on_ethylene_vinyl_alcohol_copolymer__EVOH__and_green_tea_extract_ L2 - https://doi.org/10.1021/jf201246g DB - PRIME DP - Unbound Medicine ER -