The results obtained of acetaldehyde content measurements (Table 4) revealed that the J-A and J-B beverages were
characterized by the low content of the above-mentioned flavor compound (0.088–1.754 mg·dm-3). However, during
the entire period of the study (21 days), the J-A yoghurt contained more acetaldehyde. And so in the quoted beverage
the content of the analyzed metabolite ranged from 0.520 mg·dm-3 to 2.935 mg·dm-3, and in the J-B beverage from
0.273 mg·dm-3 to 2.375 mg·dm-3. Interestingly, in both cases, the highest content of acetaldehyde was observed after 3
days of refrigerated storage. However, after this period (7th day), both in the batch of yogurt J-A and that of yoghurt JB
a substantial reduction in its content appeared, i.e. by 2.198 mg·dm-3 (75%) and 1.882 mg·dm-3 (98.83%),
respectively, compared to the 3rd day of storage. A gradual decrease in the acetaldehyde content was also observed in
the subsequent periods of research and after 21 days of refrigerated storage, both in the J-A and J-B beverages its
content was significantly lower in relation to the initial value (Table 5).