Whipped margarine is light, fluffy and spreadable -- and best when used before its expiration date. Whipped margarine doesn't freeze well, because the emulsion of vegetable oil and liquid can separate. The same is true for whipped butter, which consists of an emulsion of animal fat and liquid.
Storing Whipped Margarine and Butter
Whipped margarine and butter spreads retain their quality for as long as three months when properly packaged and stored in the refrigerator. Store margarine and butter in the original containers, and keep the containers securely covered. Don't reuse empty margarine containers for food storage, because plastic food containers are difficult to clean and may harbor bacteria.
Safe storage of margarine, butter and other perishable foods requires a temperature between 34 and 40 degrees Fahrenheit. At higher temperatures, bacteria multiplies rapidly. Store the products in the coldest part of the refrigerator, which is usually the area closest to the freezer. To be sure your refrigerator is safe for storing perishable foods, check the temperature regularly with an appliance thermometer. Test the temperature in several places to determine the coldest area.
Freezing Margarine and Butter
Although whipped margarine and butter aren't suitable for freezer storage, regular unwhipped margarine and butter freeze well for as long as one year. Freeze only fresh, high-quality margarine or butter. Leave the product in its original package or container, then place the container in a resealable plastic bag. Or wrap the container securely in aluminum foil to keep it fresh and prevent freezer burn. When you're ready to use the margarine or butter, thaw it in the refrigerator first. Do not refreeze thawed margarine.
Freezing Other Dairy Products
Freeze milk in its original container, then thaw the milk in the refrigerator before using. The thawed milk is safe for drinking, but because the texture of the milk may change, it is often best for cooking or baking. Don't freeze buttermilk, sweetened condensed milk, reconstituted dry milk, yogurt or sour cream. Although you can safely freeze heavy cream, the cream may not whip once it is thawed. Check the temperature of your freezer often, as dairy products and other foods are safely stored when freezer temperature is maintained at 0 degrees Fahrenheit or below.
- North Dakota State University Extension: Freezing Dairy Products, Eggs and Other Foods
- University of Wisconsin Cooperative Extension: Keeping Food Safe
- University of Missouri Extension: Storing Food in the Freezer
- University of Nebraska-Lincoln Extension: Refrigerated and Freezer Storage
- University of Wisconsin Extension: Choose the Right Containers -- and Location -- When Storing Food at Home
- Texas A&M University Extension: Safe Home Food Storage
- LandO'Lakes: FAQ Topics
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