Background: Green, white, and black tea water extracts are rich in phenolic compounds.
Objective: The changes in phenolic compound profiles of green, white, and black tea (GT, WT, &
BT respectively) water extracts and their respective yogurt were investigated.
Methods: Three types of yogurt with tea water extracts were prepared, and the phenolic compound
profiles were analyzed using the liquid chromatography-mass spectrometry (LC-MS) method.
Results: The present data found that flavonol glycosides such as kaempferol-3-rutinoside and
quercetin-rhamnosylgalactoside or rutinoside were present in WT extract, whereas catechin derivatives
such as gallocatechin (GC) and epigallocatechin (EGC) were present in GT extract. Moreover,
theaflavin-3-O-gallate was observed in BT extract. Many of the catechin and its derivatives
detected in the tea extracts were not identified in the tea yogurt samples. However, new phenolic
compounds were present in GT-yogurt (i.e., kaempferol-3-rutinoside and quinic acid conjugate)
but absent in GT extract.
Conclusion: GT, WT, & BT extracts could be used to enriched-yogurt with phenolic compounds,
which may have antioxidant properties.