Study on the migration phenomena of selected metals in canned fruits during long storage.

Experimental studies were conducted on the migration of Fe, Sn, Ca, and Mg in canned fruits: black currant, cherry and strawberry. Three-piece-cans had been protected with different coatings and technics. Cans of 31 capacity with fruits were stored in ambient temperature (ca 20 degrees C) during 60 weeks. There was stated increasing dependence of storage time on concentration of Fe and Sn in cans. Contents of Ca and Mg in this time systematically decreased in cans due to adsorption process of these metals on internal coatings. Migration rate of Fe and Sn, as well as migration trends of Ca and Mg (adsorption process) are shown on figures. There are great differences among migration of Fe, Sn and migration trends of Ca and Mg. Both these phenomena are disadvantageous for quality of canned fruits.