Besides the obvious preservatives for fresh fruits and vegetables, which concern the atmosphere in which the products are stored, i.e. the temperature and relative humidity, some fruit afford post-harvest preservation with the use of chemicals. Thus, citrus are preserved for longer periods when coated with special waxes, in liquid form, which formulate a film around each fruit preventing moisture loss and wilting. The citrus coating waxes are also an excellent medium for dissolving fungicides and application thereof on citrus fruit. Equally important is the prior washing of the fruit with special detergents. That’s because this task both removes potential contaminants from the fruit surface, and also opens the pores allowing better adhesion of citrus coating wax and enabling skin penetration by fungicides.
Regarding grapes, the application of sulfur dioxide to protect them from fungal infections (especially Botrytis (gray rot)) is a common practice and a prerequisite for maintaining quality. For best results, fumigation with sulfur dioxide vapor is performed within 12 hours of cutting time. This is imperative in cases where pre-cooling is slow and favors the germination of fungal spores in the presence of hot and humid air around the rails. Due to sulfur dioxide toxicity and the minimum quantity that should be present on grapes at the time they reach the consumer (value < 10 ppm has been internationally established as the minimum acceptable sulfites threshold for table grapes), special precautions are taken to protect the packing facility personnel, and to prevent both damage from excessive doses of sulfur dioxide on grapes and the existence of residues of sulfur dioxide compounds on the rails. Hence, instead of applying sulfur dioxide by fumigation, special grape preparations – preservatives can be added in the packing containers, gradually releasing sulfur dioxide. UVASYS south African plastic preservatives are leading in the grape preservatives field.
By maintaining commercial activities and strategic partnerships with leading companies in Europe, HELLAGRO offers branded and high reliability products and industrial packaging solutions, as well as agricultural supplies and quality packaging solutions for fruit, vegetables and horticultural products to the market. To ensure quality, HELLAGRO is certified and applies ISO9001: 2008 and ISO22000: 2005 standards which guarantee the high standards of its products.