Microencapsulation and storage stability of polyphenols from Vitis vinifera grape wastes

Oier Aizpurua-Olaizola*, Patricia Navarro, Asier Vallejo, Maitane Olivares, Nestor Etxebarria, Aresatz Usobiaga

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Wine production wastes are an interesting source of natural polyphenols. In this work, wine wastes extracts were encapsulated through vibration nozzle microencapsulation using sodium alginate as polymer and calcium chloride as hardening reagent. An experimental design approach was used to obtain calcium-alginate microbeads with high polyphenol content and good morphological features. In this way, the effect of pressure, frequency, voltage and the distance to the gelling bath were optimized for two nozzles of 150 and 300 μm. Long-term stability of the microbeads was studied for 6 months taking into account different storage conditions: temperatures (4 °C and room temperature), in darkness and in presence of light, and the addition of chitosan to the gelling bath. Encapsulated polyphenols were found to be much more stable compared to free polyphenols regardless the encapsulation procedure and storage conditions. Moreover, slightly lower degradation rates were obtained when chitosan was added to the gelling bath.

Original languageEnglish
Pages (from-to)614-621
Number of pages8
JournalFood Chemistry
Publication statusPublished - 1 Jan 2016


  • (+)Catechin
  • (-)Epicatechin
  • Long-term stability
  • Vibration nozzle methodology
  • Wine wastes


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