Long-term storage effect on some mineral elements of canned silver carp (Hypophthalmichthys molitrix) with reference to daily intake changes

Essential mineral elements (Fe, Na, Ca, Zn and Cu) of canned silver carp (Hypophthalmichthys molitrix) under three different sterilization conditions were analyzed after long-term storage (7-yaers). The results showed, in cans stored for a long time, concomitant with increasing the heating regimes, the Cu content significantly increased, however, the other minerals had no similar change. After long-term storage, Zn and Ca concentration of samples processed at 120 °C and 130 °C were significantly lower than those of fresh cans processed at the same thermal conditions. Post-storage daily intake limits of studying minerals (mg/day/person/) were estimated as follows: Fe (0.05 up to 0.12), Na (2.55 up to 4.04), Ca (0.27 up to 0.61), Zn (0.03 up to 0.04) and Cu (0.006 up to 0.015). According to the results of this study, the daily Cu intake increased over storage time, vice versa Na intake in all heating regimes and Zn from samples processed at 120 °C and 130 °C were significantly decreased after long-term storage.