An increased AST level is usually a sign of liver disease. Liver disease is even more likely when the levels of substances checked by other liver blood tests have also increased. An increased AST level may be due to any of the following:
In order to keep itself fresh, the lettuce gives off carbon dioxide, causing a slight odour. This carbon dioxide is not harmful and the odour should disappear quickly once the salad package is opened.
Edit 0 12 â¦. Preservatives can be anti-microbial, to inhibit the growth of bacteria, or antioxidants, to inhibit the oxidation of food constituents. Common anti-microbials: calcium propionate, sodium nitrate, sodium nitrite, sulfites (sulfur dioxide, sodium bisulfite, potassium hydrogen sulfite, etc.) and disodium EDTA.odium benzoate and benzoic acid are two very common antimicrobial compounds used in the preservation of food; sodium benzoate actually produces benzoic acid when dissolved in water. Benzoic acid has the antimicrobial properties and is found naturally in some fruits.