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Head of the Oils and Fats Department at the Food Industries and Nutrition Research Institute, National Research Centre.
Have you ever imagined that the secret to the unforgettable taste of cheese, butter and yogurt... lies in an invisible drop of fat?
From that small point, a vast world of science and beauty begins, where chemistry is mixed with food, and laboratory with taste.
In every dairy product you taste, there is a hidden story written by milk fat (Milk Fat) — the language of nature that determines flavor, texture, and value.
In this article, we open a window into this amazing world; a world that combines science, sense, industry, taste, research and experiment. Let's dive together into the journey of “white gold”... From a drop of fat to a quality system.
Milk Fat is the beating heart of the quality of dairy products. It is not just a source of energy, but the secret to the flavor, texture and nutritional value of milk and its derivatives. Its properties combine the delicate biochemistry and sensory beauty that the consumer sees in every successful brown product. In this article, we approach the world of milk fat in science, industry and food.
Milk fat consists of a variety of saturated and unsaturated short-, medium- and long-chain fatty acids, as well as soluble compounds such as cholesterol, phospholipids and fat-soluble vitamins (A, D, E, K). These ingredients affect the taste, texture, color, and behavior of the product during processing and storage. Milk fat also provides nine calories per gram and is the main medium for the absorption of fat-soluble vitamins.
It represents the first natural form of milk fat distribution in the form of a microemulsion (Emulsion) of fat droplets surrounded by a protein membrane. This structure gives it a rich taste and a homogeneous creamy texture. The percentage of fat (in cow's milk) ranges from 3.5 to 4%, making it the basis for making cream, butter and cheese.
A concentrated milk fat product with a fat content of 18— 55%. Cream has a luxurious texture and high softness. It is used in desserts, sauces and ice cream. It is characterized by its ability to whisk (Whipping) due to breaking the membranes of fat pellets and trapping air to form a stable foam.
Butter is a product rich in milk fat of nearly 80%. It has a melting point close to the body temperature (32—35°C), giving it a fast melting property in the mouth and a distinctive flavor resulting from short fatty acids such as butyric acid (Butyric Acid). It is a water-in-fat emulsion (Water-in-Fat Emulsion) used in baking, cooking and making pure ghee (Clarified Butter).
For years, municipal ghee has been described as harmful to health, but recent research has restored its rightful place. It results from heating butter to separate water and solids, leaving it nearly 99% pure fat. It contains short and medium-chain fatty acids (Butyric and Capric Acids) that are easy to digest, natural antioxidants such as vitamins A, E and K2, and CLA complex that supports heart and immunity. It has a high thermal stability (smoke point exceeding 230°C) making it ideal for safe cooking. Safe limit for daily use: 10—15 g within a balanced diet.
Murtha is the by-product formed when butter is heated to produce ghee. It is rich in salts, proteins and flavor compounds, and is traditionally used as a flavoring or savory spread. However, the high sodium and the potential for fat oxidation make its safe use very small (2—3 g per day) and very fresh. It remains part of the authentic Egyptian food heritage when consumed in moderation.
The milk fat in yogurt contributes to improving the texture and balance between acidity and fatness. Whole yogurt gives a thick creamy texture and a balanced flavor, while fat content is used to determine the type of yogurt (whole, low-fat, fat-free).
Buttermilk fat is the ingredient that gives cheese its softness, melting and distinctive flavor. The higher the percentage of fat, the more tender and creamy the cheese becomes, while the percentage is lower in hard cheeses such as Parmesan. The fat is broken down during maturation into aromatic compounds that are responsible for the unique flavors.
Buffalo milk is richer in fat (6— 8%) than cow's milk (3.5— 4%), giving it higher energy, a fuller taste and a beautiful fatty shine. Its types are used in the production of cream, butter and full-fat cheese, while cow milk is easy to digest, stable emulsified and suitable for fermented milk such as yogurt. In short, buffalo gives luxury, and beef gives lightness — both of which are the basis for the quality of Egyptian dairy.
Milk fat contains bioactive compounds such as conjugated linoleic acid (CLA) and short fatty acids that support digestive health and immunity. It also facilitates the absorption of fat-soluble vitamins and contributes to maintaining the integrity of the skin, bones and eyes.
In dairy plants, quality assessment begins with measuring the percentage of fat using devices such as Milko-Scan or Gerber Method. The percentage determines the type of industrial use and the purchase price from suppliers according to the fat-based pricing system (Fat-Based Pricing). Density (Density), Total Solids (Total Solids) and Purity are also checked to ensure quality. Fat remains the golden indicator that directs every liter of milk to its appropriate destination.
At a time when information is accelerating and there is increasing confusion between science and impression, awareness remains the first line of defense for our health and food. This article has revealed to us that milk fat is not just a food ingredient. It is an integrated system in which nutrition intersects with chemistry, and tradition with technology.
From whole milk to ghee, butter to cheese, the genius of this ingredient makes the difference between a regular product and an exceptional product.
