Preservatives on Restaurant Salads
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Benzoic Acid
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Benzoic acid is used as a preservative in salads that have mayonnaise or salad dressing. It prevents the growth of fungus as well as certain bacteria. The chemical was first discovered in the 16th century, and it is used widely as a preservative because it is cheap to prepare.
Sorbic Acid
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Sorbic acid prevents mold, fungus and bacteria from growing on food, however it does not kill mold or bacteria that has already formed. It is often added to salad dressings to preserve salad ingredients. Sorbic acid occurs naturally in certain fruits. It was first chemically synthesized in 1895.
Propionic Acid
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This substance is used as a preservative in mayonnaise and salad dressings. It prevents bacteria from forming, therefore extending the shelf life of the salad. The chemical itself has a very strong smell, and very small amounts are used in food.
Lactic Acid
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Lactic acid can be used as a preservative for salads and their dressings. It was first produced by isolating the sugars and water in cow's milk, but nowadays it is made by fermenting corn, therefore those with dairy intolerance don't need to avoid it. It has a tart flavor, so it is sometimes added to sauerkraut.
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