Introduction
Yogurt contains high content of nutrients, and can be
digested and assimilated more easily than fresh milk. It isa very popular dairy product around the world because of
its unique flavor and dietary benefits (1). Yogurt is often
prepared through fermentation of milk by Streptococcus
salivarius subsp. thermophilus (S. thermophilus) and
Lactobacillus delbrueckii subsp. bulgaricus (L. bulgaricus)
(2). According to the Food and Agricultural Organization
(FAO), yogurt must contain a large number of active and
living microorganisms, which play an important role in
promoting health, and also an abundant and viable
microflora of starter origin at the time of consumption, thus
a definition along these lines enshrined in the food laws of
many countries, with the minimum counts of viable lactic
acid bacteria (LAB) ranging between 106 and 108 CFU/mL
in yogurt (3,4).