N-Preserb is used to substitute Sodium Benzoate and Potassium Sorbate in order to control all kinds of microorganism. N-Preserb is fit for acidic foods such as soy sauce,fish sauce,pickled fruits, bakery, fruit juice and etc. It is synthetic which has property in control acid & alkaline pH. In other words, it can control the growth of all bacteria. And due to Benzoic acid Free, this product can export to many countries which ban Benzoic acid. N-Preserb can extend the shelf life according to the type of packaging, products and storage. And the suitable pH is 5-6.