Abstract
Phytomix-3 was prepared from the mixture of Lyciwn barbarum, Momordica grosvenori and Psidium guajava leaves and added together with Garcinia mangostana (pulp and pericarp). The effect of phytomix-3 + mangosteen (Ph-3 + M) enriched yogurt was studied for peptide content, inhibitory activities on alpha-amylase, alpha-glucosidase, the viability of S. thermophilus and Lactobacillus spp. during 0, 7 and 14 days of storage, both before (pre-)and after (post-) simulated gastrointestinal digestion. Antioxidant activity (DPPH assay), total phenolic content and sensory evaluation were also investigated during the storage period. Ph-3 + M yogurt showed significantly higher (p < 0.05) antioxidant activity and TPC compared to plain yogurt during storage. The highest peptide concentrations of pre- and post-digested Ph-3 + M yogurt was shown on day 7 of storage. Ph-3 + M yogurt displayed strong inhibition on alpha-glucosidase and mild inhibition on alpha-amylase inhibitory activities. Ph-3 + M yogurt enhanced the viability of S. thermophilus and Lactobacillus spp. In conclusion, Ph-3 + M yogurt could provide beneficial effects as a functional food.