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Pickling is in fact a food preservation technique. Micro-organisms, especially bacteria have diverse habitats and nutritious foods that we eat are among their favorites too. However, in pickling, a lot of acid and salt is added to preserve them.
The biological concept behind these is that, with the high salt content, a so-called hypertonic environment is developed. In such environments, the cells start losing the water inside them. This shrinks the cells and thus the bacteria are incapable of thriving. Secondly, due to high acidity, the pH of the pickle is very low and it is well known that most common bacteria (that spoil our food) thrive well at slightly alkaline pH. Thus, because of the high acidity, they aren't capable of thriving on the food.
Next time you treat your palate with your favorite pickle, do remember the salt and acid activity that is giving you an edge over the microbes.
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