Materials and Methods: Probiotic yogurt samples were prepared under laboratory scale conditions using two different
commercial starters ABY1 and 211, while ordinary yogurt samples lacked the probiotic starter cultures. All samples were
analyzed in duplicate, for C4 concentrations by gas chromatography after day 1, 2, 10 and 20 of production, during storage
at 4ºC. The results were analyzed using ANOVA and Duncan test.
Results: The level of the mentioned fatty acid in ABY1 yogurt sample was significantly higher (0.2%) than in 211 samples
(0.17%). These values were significantly lower in ordinary yogurt samples and only 0.07% was recorded in these samples
on first day of storage which decreased gradually during storage. The level of reduction in the yogurt samples tested during
different time intervals was not similar in all the examined samples, and some showed enhanced reduction than other
samples.