Yogurt and concentrated yogurt are two examples of popular fermented milk products.
The popularity of fermented milk can be attributed to their health benefits and therapeutic properties. Yogurt is produced by lactic acid fermentation of lactose in milk by lactic acid bacteria, such as Lactobacillus bulgaricus and Streptococcus thermophiles.
The synergistic actions of these two bacteria contribute to the specific texture, composition and sensory properties of yogurt.
Fresh yogurt can be processed further into concentrated yogurt by partial removal using traditional cloth-bag(Berge) or centrifugal separator method, although other methods were also investigated.
Concentrated yohurt is a semi solid product with creamy consistency, acidic flavor, with total solid content between 23 and 25 g 100 g-1