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Evaporated milk, known in some countries as "unsweetened condensed milk",[1] is ashelf-stablecannedcow’s milk product, consisting of fresh milk from which approximately 60% of the water has been removed. French inventorNicolas Appert, the "father offood science", perfected the process in the 1820s.[2] It differs fromsweetened condensed milk, which containsadded sugar and requires less processing to preserve, as the added sugar inhibitsbacterial growth.[3] The production process involves theevaporation of 60% of the water from the milk, followed byhomogenization,canning andheat sterilization.[4]
Evaporated milk consumes half the space of its nutritional equivalent in fresh milk. When the liquid product is mixed with a proportionate amount of water (150%), evaporated milk becomes the rough equivalent of fresh milk. This allows the product to have ashelf life of months or even years, depending upon the fat and sugar content, which made evaporated milk very popular before the age ofrefrigeration as a safe and reliable substitute for perishable fresh milk, as it could be shipped easily to locations lacking the means of safe milk production or storage.
In the 1920s and 1930s, evaporated milk became widely commercially available at low prices. The Christian Diehl Brewery, for instance, entered the business in 1922, producing Jerzee brand evaporated milk as a response to theVolstead Act.[5] Several clinical studies from that time period suggest that babies fed evaporated milkformula thrived as well as did breastfed babies.[6] However, modern guidelines issued by theWorld Health Organization consider breastfeeding, in most cases, to be healthier for the infant because of thecolostrum in early milk production, as well as the specific nutritional content of human breast milk.[7]
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Evaporated milk is made from fresh, homogenised milk from which 60% of the water has been removed. After the water has been removed, the product is chilled, stabilised, sterilised and packaged. It is commercially sterilised at 240–245 °F (116–118 °C) for 15 minutes.[8] A slightly caramelised flavor results from the high heat process (Maillard reaction), and it is slightly darker in colour than fresh milk. Theevaporation processconcentrates the nutrients and the food energy (kcal); unreconstituted evaporated milk contains more nutrients and calories than does fresh milk per unit volume.
Evaporated milk generally containsdisodium phosphate (to prevent coagulation) andcarrageenan (to prevent solids from settling), as well as added vitamins C and D.
Evaporated milk is sometimes used in its concentrated form in tea or coffee, or as a topping for desserts. Reconstituted evaporated milk, roughly equivalent to normal milk, is mixed one part by volume of evaporated milk with 1 1/4 parts of water.[1]
According to the United States Code of Federal Regulations, Title 21, Chapter 1, Part 131, Sub part B, Section 130 "Evaporated milk", (April 2006):
(a) Description. Evaporated milk is the liquid food obtained by partial removal of water only from milk. It contains not less than 6.5 percent by weight of milk fat, not less than 16.5 percent by weight of milk solids not fat, and not less than 23 percent by weight of total milk solids. Evaporated milk contains added vitamin D as prescribed by paragraph (b) of this section. It is homogenized. It is sealed in a container and so processed by heat, either before or after sealing, as to prevent spoilage....
Sections (b)–(f) of the code regulate vitamin addition, optional ingredients, methods of analysis, nomenclature and label declaration.[9]
Evaporated milk in Canada is defined to be milk from which water has been evaporated and contains at least 25% milk solids and 7.5%milk fat. It may contain added vitamin C if a daily intake of the product contains between 60 and 75 milligrams, and may also contain vitamin D in an amount no less than 300international units and no more than 400 international units.Disodium phosphate orsodium citrate (or both) may be added, as well as anemulsifying agent.[10]
Theshelf life of canned evaporated milk varies according to both its added content and its proportion of fat. For the regular unsweetened product, a shelf life of 15 months may be expected before any noticeable destabilization occurs.[11]
Evaporated milk is sold by several manufacturers:
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