Which milk is best for you? Pasteurised vs Sterilised Milk/ HTST Pasteurisation/UHT Milk/Packet Milk

Summary

The video explains the differences between pasteurized and sterilized (UHT) milk. Pasteurization heats milk below 100°C, killing most bacteria while preserving taste and nutrients. This milk lasts for days when refrigerated. Sterilized milk, on the other hand, is treated at 138°C, killing all bacteria and extending shelf life to months without refrigeration, but may alter the milk's flavor. The choice between the two depends on preferences for safety or taste, with pasteurized milk being fresher and more common, while sterilized milk offers a longer shelf life.

Takeaways

• 🧊 One type of milk has an expiry of 5-7 days if refrigerated, while another can last 3 months at room temperature.
• 📜 The key difference between these two milks is how they are processed: one is pasteurized, the other is sterilized (UHT).
• 🔥 Pasteurized milk is heated to a specific temperature (usually below 100°C) to kill harmful bacteria, extending its shelf life.
• ⏱ Pasteurization involves heating milk to 63°C for 30 minutes or 72°C for 15 seconds (HTST method).
• 🍽 Examples of pasteurized foods include fresh cheeses, cream, ice cream bases, eggs, and fresh pasta.
• 💯 Sterilized milk, also known as UHT milk, is heated to 138°C for 2 seconds, killing all bacteria including spores.
• 📦 Sterilized or UHT milk has a longer shelf life, lasting several months without refrigeration.
• 🥫 Examples of sterilized foods include jams, canned tuna, and tomato puree, as they also undergo a similar process.
• 💡 Sterilized milk is safer but may have a slightly cooked or caramelized flavor due to high heat treatment.
• 🍶 Pasteurized milk retains more of its fresh taste and nutritional properties, making it a popular everyday choice.

Q & A

What is the main difference between pasteurized and sterilized milk?

The main difference between pasteurized and sterilized milk is how the milk is processed. Pasteurized milk is heated to a temperature below 100°C to kill harmful bacteria while preserving some of the milk's original qualities. Sterilized (UHT) milk is heated to 138°C for 2 seconds, which completely eliminates bacteria, resulting in a longer shelf life.

How long can pasteurized milk last if refrigerated?

Pasteurized milk typically lasts 5-7 days when stored in the refrigerator.

How long can sterilized (UHT) milk last at room temperature?

Sterilized (UHT) milk can last for several months at room temperature without the need for refrigeration.

What temperature and time combination is used in high-temperature short-time (HTST) pasteurization?

In HTST pasteurization, milk is heated to 72°C for 15 seconds.

Why does sterilized milk have a longer shelf life than pasteurized milk?

Sterilized milk undergoes a more intense heat treatment at 138°C, which kills all bacteria and spores, allowing it to last for several months without refrigeration.

Does pasteurization completely eliminate bacteria from milk?

No, pasteurization does not completely eliminate bacteria. It kills many harmful bacteria but does not eliminate all microorganisms in the milk.

What is the typical flavor difference between pasteurized and sterilized milk?

Pasteurized milk retains a fresher, sweeter taste, while sterilized (UHT) milk may develop a slightly cooked or caramelized flavor due to the higher heat treatment.

What are some examples of other pasteurized food items?

Examples of other pasteurized food items include fresh cheeses, cream, ice cream bases, eggs, and fresh pasta.

What is the advantage of using sterilized milk in terms of food safety?

Sterilized milk is safer in terms of food safety because it undergoes a more rigorous heat treatment that eliminates all bacteria, including spores, reducing the risk of contamination.

Which type of milk is more readily available in grocery stores, pasteurized or sterilized?

Pasteurized milk is more readily available in grocery stores compared to sterilized (UHT) milk.