As nowadays there is a growing concern about micronutrients deficiency in human food products, agronomic biofortification is being considered an enrichment potential technological option. In this context, to surpass limitations of Zn intake, ensuring proper level of this element for growth and maintenance of human health, this study aimed to develop a technological workflow for Zn enrichment of grapes (Syrah variety of Vitis vinifera) and assess the related quality. A foliar application of zinc oxide (ZnO) or zinc sulfate (ZnSO4) (respectively, at a concentration of 30% and 60% - 450g ha−1 and 900g ha−1) was carried out. At harvest, Zn enrichment in grapes revealed a 1.6 fold increase relatively to control. In Zn biofortified grapes, the analysis of the color parameters, through the Cielab system, a low luminosity, low contribution of green and greater input of blue (as indicated by L, a and b parameters) was found. Concerning to firmness, penetration force and hardness of the pulp, no significant differences were found between the control and treated samples, which additionally pointed that fruit texture was not affected. Sensory analysis of the grapes further pointed a positive response to biofortified grapes. It was concluded that biofortification of grapes can mitigate the deficiency of zinc without negative effects on quality.
Original languageEnglish
Title of host publicationProceedings of the 1st International Conference on Water Energy Food and Sustainability (ICoWEFS 2021)
EditorsJoão Rafael da Costa Sanches Galvão, Paulo Sérgio Duque de Brito, Filipe dos Santos Neves, Flávio Gabriel da Silva Craveiro, Henrique de Amorim Almeida, Joel Oliveira Correia Vasco, Luís Miguel Pires Neves, Ricardo de Jesus Gomes, Sandra de Jesus Martins Mourato, Vânia Sofia Santos Ribeiro
Place of PublicationCham
Number of pages8
ISBN (Electronic)978-3-030-75315-3
ISBN (Print)978-3-030-75314-6, 978-3-030-75317-7
Publication statusPublished - 9 May 2021
Event1st International Conference on Water Energy Food and Sustainability - Leiria, Portugal
Duration: 10 May 202112 May 2021


Conference1st International Conference on Water Energy Food and Sustainability
Internet address


  • Syrah grapes
  • Sensory analysis
  • Zinc biofortification


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