The impact of pasteurization on milk primarily manifests in the following aspects:
- Preserves Original Flavor and Nutrition: Compared to traditional boiling methods, pasteurization is much gentler, allowing it to better retain milk's original flavor and nutrients. Pasteurized milk typically has a shorter shelf life, but it maintains a taste and nutritional profile that is far closer to fresh, unprocessed milk.
- Minimal Impact on Proteins and Fats: Pasteurization uses relatively low temperatures, so its effect on milk's proteins and fats is minimal. It only causes partial denaturation of casein micelles, forming small clots. These clots not only enhance the milk's thickness and mouthfeel but also improve the human body's digestibility and absorption rate of casein. Whey protein, meanwhile, remains largely undenatured at pasteurization temperatures, so its biological activity and nutritional value remain intact.
- Impact on Fats: Milk fats undergo no significant changes during pasteurization. Only a portion of the fat globule membranes break down, releasing small amounts of free fatty acids. These free fatty acids boost the milk's aromatic profile and also enhance the digestion and absorption of fats in the human body.
In summary, pasteurized milk is closer in taste to fresh milk, retaining its rich, creamy texture and abundant nutrients. At the same time, it avoids the undesirable flavors and nutrient loss that may come with high-temperature processing.
