Russian and Ukrainian prostokvasha (kysliak), traditional fermented milk
Main ingredients
Milk
Media: Soured milk
Soured milk denotes a range of food products produced by the acidification of milk. Acidification, which gives the milk a tart taste, is achieved either through bacterial fermentation or through the addition of an acid, such as lemon juice or vinegar. The acid causes milk to coagulate and thicken, inhibiting the growth of harmful bacteria and improving the product's shelf life. It is not good for making cheese.
Soured milk that is produced by bacterial fermentation is more specifically called fermented milk or cultured milk.[1] Traditionally, soured milk was simply fresh milk that was left to ferment and sour by keeping it in a warm place for a day, often near a stove. Modern commercial soured milk may differ from milk that has become sour naturally.[2][full citation needed]
Soured milk that is produced by the addition of an acid, with or without the addition of microbial organisms, is more specifically called acidified milk.[1] In the United States, acids used to manufacture acidified milk include acetic acid (commonly found in vinegar), adipic acid, citric acid (commonly found in lemon juice), fumaric acid, glucono-delta-lactone, hydrochloric acid, lactic acid, malic acid, phosphoric acid, succinic acid, and tartaric acid.
Soured milk is commonly made at home or is sold and consumed in Eastern Europe, the Balkans and Scandinavia.
It is also made at home or sold in supermarkets and consumed in the Great Lakes region of Somalia and Eastern Africa (Kenya, Uganda, Rwanda, Burundi and Tanzania). It is also a traditional food of the Bantu people of Southern Africa.
Since the 1970s, some producers have used chemical acidification in place of biological agents.[3][4][5][6]
^ ab"TITLE 21--FOOD AND DRUGS: CHAPTER I, PART 131 MILK AND CREAM". Electronic Code of Federal Regulations (e-CFR). 2007-04-01. Retrieved 2007-11-18.[permanent dead link]
^"Dairy-Milk". Retrieved 2014-03-01.
^
Nakamura, Yasunori; Yamamoto, Naoyuki; Sakai, Kumi; Takano, Toshiaki (June 1, 1995). "Antihypertensive Effect of Sour Milk and Peptides Isolated from It That are Inhibitors to Angiotensin I-Converting Enzyme". Journal of Dairy Science. 78 (6): 1253–7. doi:10.3168/jds.S0022-0302(95)76745-5. PMID 7673515. Retrieved 2007-06-30.
^
Sukhov, SV; Kalamkarova, LI; Il'chenko, LA; Zhangabylov, AK (1986). "Microfloral changes in the small and large intestines of chronic enteritis patients on diet therapy including sour milk products". Voprosy pitaniia (in Russian). Jul–Aug (4): 14–7. PMID 3765530.
^US patent 3625702, Exler, Heinrich, "PREPARATION OF SOUR MILK DRINKS", published 1971-12-07, issued 1971-12-07, assigned to Heinrich Exler
^US patent 3978243, Pedersen, Jens Kristian, "Process for preparing gelled sour milk", published 1976-08-31, issued 1976-08-31, assigned to Kobenhavns Pektinfabrik
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