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Title: Chemical Preservatives 1.Calcium disodium EDTA It was found in "mayonnaise". Properties It is the salt of ethylene diamine tetraacetic acid (EDTA). Utilization It is applied as a chelating agent. Its function is to control the reaction of metal ions with some organic and inorganic components that will result in deterioration of foods. Apart from that, the preservative also acts as antioxidant antimicrobial agent, especially against gram-negative bacteria. Mechanisms of action Ca disodium EDTA blocks the normal reaction of metal ions by binding to their reactive sites. This increases its efficiency as an antioxidant. Consequently, the oxidation of ascorbic acid and fat-soluble vitamins is hindered and also the rancidity of the product. The resistance of gram-negative bacteria is overcome by the removal of lipopolysaccharide containing membrane. 2.Calcium Propionate (C6H10CaO4) It was found in " wholemeal bread rolls". Properties It is the salt of propionic acid. It is only soluble in water but insoluble in...

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