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EFFECT OF METAL IONS ON RESIDUAL NITRITE 1
Author(s) -
LEE M.,
CASSENS R. G.,
FENNEMA O. R.
Publication year - 1981
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/j.1745-4549.1981.tb00634.x
Subject(s) - chemistry , ferrous , nitrite , ferric , inorganic chemistry , metal , metal ions in aqueous solution , zinc , nitrate , chloride , ion , magnesium , electron acceptor , photochemistry , organic chemistry
The effect of various metal ions on residual nitrite was studied in both a meat system and a model system. Reducing ability, nitrosylhemochrome, nitrate and pH were determined in an attempt to explain the mechanism of loss of nitrite in the system. The control meat system contained 2% NaCl and 156 ppm of NaNO 2 while treatment groups had 0.05% of metal ions (Fe ++ , Fe +++ , Cu ++ , Zn ++ , Ca ++ , and Mg ++ as chloride salts) substituted for the same amount of NaCl. The results showed that ferrous (Fe ++ ), ferric (Fe +++ ), cupric (Cu ++ ) and Zinc (Zn ++ ) ions caused a depletion of nitrite while calcium (Ca ++ ) and magnesium (Mg ++ ) ions did not have any effect on residual nitrite. The model system consisted of 25 mM PIPES buffer at pH 5.8 to which was added 156 ppm NaNO 2 with or without 0.05% metal ions. Only ferrous (Fe ++ ) ion decomposed more nitrite than the control after heating. Considering the results from both systems, the mode of action for each ion appeared to be different; ferrous ion appeared to act directly as an electron donor, ferric ion acted like ferrous after being reduced, cupic ion appeared to act as an electron donor after being reduced and then as an electron acceptor, and zinc ion seemed to be effective only by decreasing the pH of the system.