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Influence des propriétés de barrière d'emballage fléxible sur la stabilité du lait entier en poudre.

Influência das propriedades de barreira de embalagens flexíveis na estabilidade de leite em pó integral.

Auteurs : ALVES R. M. V., JAIME S. B. M., ITO D., et al.

Type d'article : Article

Résumé

Whole milk powder has been marketed in tinplate cans and metPET (metallized polyester)/LDPE (low density polyethylene) flexible packages. The objective of this study was to correlate package barrier properties to its ability to preserve whole milk powder quality and assess the viability of using structures containing metBOPP (metallized biaxially oriented polypropylene). Two flexible structures were studied under 25°C/75% RH, 35°C/90% RH and 35°C/50% RH storage conditions. The metPET/LDPE film had the poorest ability to maintain product quality (rejection occurred after 2-3 and 10 months, for 35°C/90% RH and 25°C/75% RH, respectively), as compared to the PET/metBOPP/LDPE structure (rejectable after 4 months at 35°C/90% RH, but acceptable at 12 months, at 25°C/75% RH). These different performances resulted from increased product water activity, causing Maillard reaction due to the WVTR in tested packages. However, under storage conditions having low relative humidity (35°C/50% RH), the quality loss of the product was caused by the development of rancidity flavour due to lipid oxidation. This off-flavour led to the rejection of the product after 7 months in PET/metBOPP/LDPE and 9 months in metPET/LDPE. The worst performance for the metBOPP structure was due to high oxygen content in the package headspace, caused in turn by the higher oxygen transmission rate, as compared to the metPET structure. The product quality in tinplate cans was acceptable for 12 months, regardless of storage conditions.

Détails

  • Titre original : Influência das propriedades de barreira de embalagens flexíveis na estabilidade de leite em pó integral.
  • Identifiant de la fiche : 2009-1728
  • Langues : Portugais
  • Source : Braz. J. Food Technol. - vol. 11 - n. 1
  • Date d'édition : 01/2008

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