Benzoic acid and sulphur dioxide

Preservatives are added to preserve the texture, flavour, appearance, crispness and colour of the fresh fruit. Sugar is also used to preserve fruit juices. Benzoic acid and sulphur dioxide are preservatives that are added to juices and beverages to prevent microbial growth or undesirable chemical changes. The maximum permissible limits are 350 ppm for sulphur dioxide and 600 ppm for benzoic acid. • Benzoic acid and sulphur dioxide were not detected in the 100% juices. In fruit drinks, highest quantity of preservatives were found in Tasty Treat; Real and Minute Maid had the least amount of preservatives, while none was detected in Tropicana.

Ascorbic acid

Manufacturers sometimes use ascorbic acid as a preservative, antioxidant or colour stabiliser, or to boost vitamin C content. It is a water-soluble vitamin and a powerful antioxidant, it helps the body form and maintain connective tissue, including bones, blood vessels and skin. • Ascorbic acid was highest in Real Activ (61.7 mg/100 ml) among mixed fruit juices and in Real Fruit Power (23.6 mg/100 ml) among fruit drinks. It was lowest in Tropicana 100% and Tasty Treat in their respective categories.