a decreasing trendp < 0.05
The pH values of five kinds of yogurt showed a decreasing trend following 21 days of storage ( p < 0.05), while the acidity of five kinds of yogurt increased and reached their maximum at 21 days.
The pH values of five kinds of yogurt showed a decreasing trend following 21 days of storage ( p < 0.05), while the acidity of five kinds of yogurt increased and reached their maximum at 21 days.