Incorporation of strawberries preparation in yoghurt: impact on phytochemicals and milk proteins

Ana Oliveira, Elisabete M. C. Alexandre, Marta Coelho, Cláudia Lopes, Domingos P. F. Almeida, Manuela Pintado*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

An immediate decrease in the total antioxidant activity (23%) and total phenolic content (14%) was observed after addition of strawberry preparations to yoghurt. The total anthocyanin content did not change immediately, but decreased 24% throughout the yoghurt shelf-life. The individual compounds, (+)-catechin (60%), (-)-epicatechin (60%), kaempferol (33%) and quercetin-3-rutinoside (29%) decreased after 24 h in the yoghurt made with the strawberry preparation. During the remaining period of storage these compounds increased by 47%, 6%, 4% and 18%, respectively. Pelargonidin-3-glucoside decreased 49% after 28 d. Immediately after the addition of the strawberry preparation to yoghurt, β-lactoglobulin decreased to values lower than the limit of detection and α-lactalbumin by approximately 34%, and was reduced further slowly throughout yoghurt self-life. An immediate interaction between the carrageenan present in the strawberry preparation and β-LG was observed. The variations of both polyphenols and protein in the presence of carrageenan and the potential interactions were discussed.
Original languageEnglish
Pages (from-to)370-378
Number of pages9
JournalFood Chemistry
Volume171
DOIs
Publication statusPublished - 15 Mar 2015

Keywords

  • Carrageenan
  • Milk proteins
  • Polyphenols
  • Strawberry
  • Yoghurt

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