Acid in marinades helps to tenderize meat by breaking down proteins and also enhances flavor penetration.
Acids, such as lemon juice, vinegar, or yogurt, are key ingredients in marinades for several reasons. First and foremost, they contribute to tenderizing meat. The acid works by partially denaturing the proteins on the surface of the meat. This process weakens the protein structure, making the meat more tender and easier to chew after cooking.
Secondly, acid helps to enhance flavor penetration. By breaking down the surface of the meat, the marinade's flavors can more easily permeate the meat, resulting in a more flavorful and aromatic final product. The acid itself can also contribute to the overall flavor profile, adding brightness and complexity.
Finally, acid can also act as a preservative, inhibiting the growth of bacteria and extending the shelf life of the marinated meat. However, it's important to note that the primary purpose is tenderization and flavor enhancement.
Be careful not to marinate meat for too long in a highly acidic marinade, as it can result in a mushy texture. A general rule of thumb is to marinate for a few hours to overnight, depending on the type of meat and the strength of the acid.