Syneresis and rheological behaviors of set yogurt containing green tea and green coffee powders


Donmez O., ATAÇ MOGOL B., GÖKMEN V.

JOURNAL OF DAIRY SCIENCE, vol.100, no.2, pp.901-907, 2017 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 100 Issue: 2
  • Publication Date: 2017
  • Doi Number: 10.3168/jds.2016-11262
  • Journal Name: JOURNAL OF DAIRY SCIENCE
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.901-907
  • Keywords: set yogurt, green tea, green coffee, protein-polyphenol interaction, syneresis rate, PHYSICAL-PROPERTIES, MILK, MODEL, PARTICLES, TEXTURE, STRAINS

Abstract

This study aimed to investigate the effect of added green coffee powder (GCP) and green tea powder (GTP) on syneresis behavior and consistency of set yogurts. Adding GCP (1 or 2%) decreased syneresis rate. The effect of GTP on the syneresis rate was concentration dependent. In comparison to the control, GTP decreased syneresis rate when it was added at 0.02%, but it caused an increase when added at 2%. No significant difference was observed in the syneresis rates when GTP was added at 1 and 0.01%, until 14 and 7 d of storage, respectively. The Herschel-Bulkley model parameters indicated that the consistency of control was considerably lower than that of GCP yogurts during 14 d, whereas it was higher at the end of storage. The GTP yogurt results showed that the consistency coefficients of GTP yogurts were different from those of control samples until 14 d of storage. In conclusion, GTP and GCP behaved differently in acidified gel networks of set yogurt, modifying its rheological behavior, as they have different profiles and concentrations of polyphenols.