Abstrac t:In this study, the effect of "Osmodehydrofrozen" fruits on sensory, physical, chemical and
microbiological properties of yoghurt and its quality during storage was evaluated. This research was done
in two stages. At the first stage, the fruit percentage, type and addition time (before and after of
fermentation) was determined, the results indicated that yoghurts which contained 10% apple or 13%
strawberry and added after fermentation had better quality. Because of high osmotic activity of apple, the
synersis value was lower in apple yoghurt. According to osmotic activity in both fruits, the synersis value
was very lower than fruit yoghurts which contained untreated fruits. Taste value was higher in strawberry
yoghurt and texture and mouth feel values was higher in the yoghurt with high percentages of fruit. The
results of second stage (quality evaluation during storage) indicated that storage had significant effect on
pH, acidity, synersis, taste and texture (p<0.05). The sample contained apple didn't have any mold and
yeast; Coliforms disappeared after 7 days of storage. In samples which contained strawberry, yeasts were
grown and coliforms disappeared after 7 days of storage.
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