کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2434427 | 1107008 | 2014 | 7 صفحه PDF | دانلود رایگان |
The effect of a cold step during the fermentation of fat-free yogurt was studied. Fermentation of skim milk was stopped at approximately pH 5.2 by reducing the temperature to 4 °C for 30–120 min. After each cold step, fermentation continued at 40 °C to approximately pH 4.6. Yogurts from milk subjected to a cold step exhibited a protein matrix with a strong solid-like behavior and improved whey holding capacity when compared with control yogurts (uninterrupted fermentation). TEM showed a strong micellar aggregation in the case of control yogurts but a thin casein protein matrix for yogurt stored at 4 °C for 60 min before the fermentation was complete. These findings indicate that introducing a cold step during the fermentation process is a potential method to improve the resistance to syneresis of fat-free yogurt without the need to add stabilizers or gums that may be considered undesirable by consumers.
Journal: International Dairy Journal - Volume 36, Issue 1, May 2014, Pages 14–20