Milk Pasteurization and milk homogenization processes differ greatly in the purpose of each procedure, the methods and the benefits. Each of these processes aims to improve the state of milk so that it can be consumed. Commercial producers ensure that milk undergoes these two processes, which is why one is able to buy milk that lasts a long time before opening and without refrigeration. One may notice that the label on a milk brand stating pasteurized and homogenized does not explain what these two statements entail. This blog elaborates on the two distinct processes and their benefits.
The pasteurization process
This is a process where raw milk undergoes consistent heating and cooling to eliminate harmful bacteria that have the potential to cause diseases in humans. The process requires a vat pasteurizer, which is a stainless steel tank, the best material because of its high resistance and ability to withstand temperature fluctuations. These tanks are double-walled to provide a double jacket around the sides and the bottom to allow steam to circulate for heating and cooling. There are various pasteurization methods that can be conducted, such as
Method 1: The milk is heated for around 15 seconds at 72°C and then cooled instantly.
Method 2: The milk is heated in batches at 63°C.
Method 3: The milk is heated for a minute over 135°C
Why the pasteurization process is important
Makes it safe for consumption: The heating and cooling process kills harmful bacteria that cause diseases and makes it safe for consumption.
Disease-free: The heating and cooling process makes the milk consumable and eliminates the risk factors of causing diseases.
A better shelf life: The extreme temperatures and the specified time frame improve the shelf life even without refrigeration, which makes it possible for storage.
The homogenization process
Milk undergoes a process known as the homogenization process, which aims at breaking down large particles into even smaller particles to improve the consistency and the texture. The milk is poured into the high-pressure homogenizer that has a pressure pump and valves. The pump and valves cause intense pressure that breaks down the particles and causes an even texture.
The process of milk homogenization
Preheated milk is pumped under high pressure through narrow valve openings.
This process causes the large particles to break down into small particles.
This process does not involve additives; it only breaks down large particles and ensures even consistency and texture.
Why the homogenization process is important
The process prevents cream from rising to create a layer at the top of the container.
The process improves the consistency of the milk, making it smooth and even.
This process improves how milk blends well with coffee or when baking.
Conclusion
Milk that does not undergo these two processes has a high chance of containing harmful bacteria, which increases the chances of spreading diseases on a large scale, and it is advised not to consume such milk. The milk may also have an inconsistent texture, which may not be appealing to consume, or it may become difficult to blend it with other products. These two processes require specific machines, which are the vat pasteurizer and a high-pressure homogenizer supplied by NK Dairy Equipments. Himpreet Kaur leads a team of engineers who manufacture high-quality dairy processing machines to help commercial dairy producers make the best dairy products at a large scale.
FAQ’s
Is milk pasteurization and sterilization the same thing?
Milk pasteurization and milk sterilization differ in the heating process and how many microbes survive; the milk pasteurization heating process varies depending on the method used but aims at killing harmful bacteria, whilst milk sterilization aims at heating milk at over 135°C to kill living microorganisms and spores.
How do dairy producers confirm that the milk is thoroughly pasteurized?
The producers conduct an alkaline phosphatase test, which aims to detect whether a specific enzyme has been destroyed.