Edexcel B3 Making Yoghurt and Soy Sauce(detailed)

Making Yoghurt

• Make sure environment and equipment is sterile, this will stop contamination
• Milk is heated to kill bacteria
• Milk is stirred to ensure all the ingredients are mixed together
• Milk protein is added
• Lactobacillus bacteria is added whilst the milk is still warm
• Lactobacillus bacteria ferment the sugar lactose to lactic acid
• PH of milk is lowered to a such a point that the milk proteins coagulate forming a semi solid milk- this is raw yoghurt
• Flavours can be added

Making Soy Sauce

• Soy beans are cooked which kills bacteria…