Stability of vitamins A and C in fortified yogurt.
Plain and raspberry flavored low fat yogurt samples were fortified with various commercial forms of vitamins A and C under actual production conditions. Immediately after processing, yogurt samples were kept at 3 degrees C for 6 wk and were analyzed biweekly for pH, titratable acidity, and vitamins A and C. Data revealed that both vitamins decreased gradually in fortified yogurt with vitamin C decreasing at a higher rate than vitamin A. However, a fortification level of 10,000 IU of vitamin A and 300 mg of vitamin C per 227 g container of plain or flavored yogurt provided at least 100% of the US recommended daily allowance of both vitamins after 6 wk storage at 3 degrees C. This level of fortification did not significantly change pH, titratable acidity, or sensory characteristics of yogurt samples.
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Division of Agriculture, Arizona State University, Tempe 85287.
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D001205:Ascorbic Acid / Q000032:analysis*; D003611:Dairy Products / Q000032:analysis*; D004355:Drug Stability; D005527:Food, Fortified / Q000032:analysis*; D014801:Vitamin A / Q000032:analysis*; D015014:Yogurt / Q000032:analysis*
D014801:Vitamin A; D001205:Ascorbic Acid