Describe the classification of foods according to pH. Define thermal death point (TDP). Explain the procedure of its determination

Foods can be classified according to their pH, or the measure of acidity or alkalinity, into the following categories:

1. Acidic foods: These are foods with a pH below 7.0, such as citrus fruits, tomatoes, vinegar, and pickled vegetables. Acidic foods are less hospitable to the growth of spoilage microorganisms and can be stored for a longer period of time. Some acidic foods, such as fermented foods, can be preserved through the action of lactic acid bacteria, which convert sugars into lactic acid.

2. Neutral foods: These are foods with a pH around 7.0, such as water, potatoes, and most dairy products. Neutral foods are vulnerable to spoilage and must ____ ________ ____ ____ ______ ________ _____ _________ __________ ________.
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