Preservatives are food additives that play an important role in making foods last longer or taste better. Specifically, preservatives help to control and prevent the deterioration of food, providing protection against spoilage from micro-organisms (e.g., bacteria, yeast, moulds), life-threatening botulism and other organisms that can cause food poisoning (antimicrobial function). These products including citric acid and citrate, sorbic acid, potassium sorbate, benzoic acid and benzoate, , propionic acid and proprionate, ascorbic acid and ascorbate, etc.