Determination of lactic acid bacteria counts, oxidation, and antioxidant
lactic acid bacteria counts, oxidation, and antioxidant contents of frozen yogurts were measured during 6 weeks of storage at -22 c. ST and LB counts were conducted according to the method of Dave and Shah (1997). The oxidation of the frozen yogurts during storage was determined by measuring the peroxide value and thiobarbituric acid reactive substances in order to measure primary and final oxidation products respectively.peroxide value was determined according to Boon et al. (2008).
thiobarbituric acid reactive substances is a method in which final oxidation products of the lipid soluble components of the frozen yogurt react with Thiobarbituric acid forming condensation products. Absorbance of those compounds is measured at 530 nm The analysis was conducted as described by Hekmat and McMahon(1997)