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A lemon chicken marinade.

Marination, also known as marinating, is the process of soaking foods in a seasoned, often acidic, liquid before cooking. The origins of the word allude to the use of brine (aqua marina) in the pickling process, which led to the technique of adding flavor by immersion in liquid. The liquid in question, the 'marinade' can be acidic with ingredients such as vinegar, lemon juice, or wine, or savory with soy sauce, brine or other prepared sauces. Along with these liquids, a marinade often contains oils, herbs, and spices to further flavor the food items.

It is commonly used to flavor foods and to tenderize tougher cuts of meat or harder vegetables such as beetroot, eggplant (aubergine), and courgette (zucchini). The process may last seconds or days. Different marinades are used in different cuisines. In Indian cuisine the marinade is usually prepared with yoghurt and spices.

In meats, the acid causes the tissue to break down, allowing more moisture to be absorbed and giving a juicier end product. However, too much acid can be detrimental to the end product. A good marinade will have a delicate balance of spices, acids, and oil.

Often confused with marinating, "macerating" is also a form of food preparation. Often soft vegetables, legumes or fruits are used and are also coated in a liquid. This process, again, makes the food tastier and easier to chew and digest

Some studies have shown that a reaction between creatine in muscle meats and amino acids caused by flame-cooking at high temperatures produces a cancer-causing agent known as heterocyclic amine (HCA). New research seems to indicate that marinades may discourage formation of certain HCAs in char-grilled meat.^{[citation needed]}

Immersion in an acid-based marinade for as little as forty minutes resulted in a decrease of 92-99% of heterocyclic amines (HCAs) in recent tests by the American Institute for Cancer Research. More studies are being conducted, but the acidic component in marinades seems to be very effective. Marinating is currently the best known method of discouraging the formation of HCAs.

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