Chemical Composition of the Laboratory–Made Mozzarella Cheese
Figure (1) shows the result of titrable acidity as lactic acid (mg/100g) during storage period for mozzarella cheese types prepared from cow’s, goat’s and mixture milk (1:1 cow’s milk: goat’s milk). The titrable acidity (expressed as lactic acid%) of cow’s milk mozzarella cheese (CMMC) was 0.203 ± 0.01%, this value was lower than that of El Owni and Osman[7], who reported a value of 0.59 ± 0.90% in CMMC. The titrable acidity of goat’s milk mozzarella cheese (GMMC) was 0.13 ± 0.01% which was lower than the value 1.51 ± 0.02% obtained by Srbinovska et. al.[8]. However, the titrable acidity of GMMC was significantly lower than that of CMMC and MMMC throughout the storage period; however no significant difference was found in titrable acidity of mixture milk mozzarella cheese at 30 day at storage period compared to other samples.
Figure (1) also shows the pH values during storage period for the different mozzarella cheese types. The pH of CMMC was 5.2 ± 0.1, this value is similar to that of Sameen et. al.[9], who reported a value of 5.23 ±0.01 in cow's milk mozzarella cheese. The pH of GMMC (5.21 ± 0.001) was in close agreement to the value 5.6 ± 0.1 obtained by Srbinovska et. al.[8]. The pH of MMMC was significantly lower than that of CMMC and GMMC throughout the storage period. No significant difference was found in pH of GMMC compared to that of CMMC throughout storage period.