- Curing (food preservation)
Curing refers to various food preservation and flavoring processes, especially of meat or fish, by the addition of a combination of salt, nitrates, nitrite or sugar. Many curing processes also involve smoking, the process of flavoring, cooking, or preserving food by exposing it to the smoke from burning or smoldering plant materials, most often wood. The use of food dehydration was the earliest form of food curing.
Food curing dates back to ancient times, both in the form of smoked meat and as salt-cured meat. The Plains Indians used to hang their meat at the top of their teepees to increase the amount of smoke coming into contact with the food. It was discovered in the 1800s that salt mixed with nitrites (saltpeter) would color meats red, rather than grey, and consumers at that time then strongly preferred the red-colored meat.
Table salt (sodium chloride) is the primary ingredient used in meat curing. Removal of water and addition of salt to meat creates a solute-rich environment where osmotic pressure draws water out of microorganisms, retarding their growth. Doing this requires a concentration of salt of nearly 20%. In addition, salt causes the soluble meat proteins to come to the surface of the meat particles within sausages. These proteins coagulate when the sausage is heated, helping to hold the sausage together. Finally, salt slows the oxidation process, effectively preventing the meat from going rancid.
The sugar added to meat for the purpose of curing it comes in many forms, including honey, corn syrup solids, and maple syrup. However, with the exception of bacon, it does not contribute much to the flavor, but it does alleviate the harsh flavor of the salt. Sugar also contributes to the growth of beneficial bacteria like Lactobacillus by feeding them.
Nitrates and nitrites
Nitrates and nitrites not only help kill bacteria, but also produce a characteristic flavor and give meat a pink or red color. Nitrate (NO3−), generally supplied by sodium nitrate or potassium nitrate, is used as a source for nitrite (NO2−). The nitrite further breaks down in the meat into nitric oxide (NO), which then binds to the iron atom in the center of myoglobin's heme group, reducing oxidation and causing a reddish-brown color (nitrosomyoglobin) when raw, and the characteristic cooked-ham pink color (nitrosohemochrome or nitrosyl-heme) when cooked. The addition of ascorbate to cured meat reduces formation of nitrosamines, but increases the nitrosylation of iron. The use of nitrates in food preservation is controversial, though, due to the potential for the formation of nitrosamines when the preserved food is cooked at high temperature. The usage of either compound is therefore carefully regulated; for example, in the United States, the concentration of nitrates and nitrites is generally limited to 200 ppm or lower. However, they are considered irreplaceable in the prevention of botulinum poisoning from consumption of cured dry sausages by preventing spore germination.
Meat can also be preserved by smoking, which is to cook the meat in the presence of smoke. (Thus, the meat is usually near a fire.) Slow-cooking meat while smoking it will also keep it tender. One method of smoking calls for a smokehouse with damp wood chips or sawdust.
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Food preservation Cooking techniques DryConductionConvectionRadiation WetHigh heatLow heatIndirect heat Fat-basedHigh heatLow heatGentle frying · Sweating Mixed medium Device-based Non-heat See also
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