and slightly increased at the latter part of storage.
Decrease of pH may be due to increase of lactic acid
production by lactic acid bacteria. As sugar sources
finish, microorganisms begin to consume proteins
and producing some products such as peptides
by microorganisms as a result of biochemical
metabolism, may cause slight pH increase at the later
part of storage (Vahedi et al., 2008). The pH values of
all the rice yogurts were within generally acceptable
level for yogurt during the storage.