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(a) Changes of pH during storage at 4 °C. (b) Changes of titratable acidity during storage at 4 °C. Vertical lines represent standard deviations. ABC Means with different uppercase are significantly (p < 0.05) different between each type of yoghurt, for a particular day of storage; abcde Means with different lowercase are significantly (p < 0.05) different between each day, for each type of yoghurt during the storage.
