Factors controlling the growth of Clostridium botulinum types A and B in pasteurized cured meats VI. Nitrite monitoring during storage of pasteurized pork slurries

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Abstract
Summary: Residual nitrite levels were monitored during storage for up to 6 months, in a model pork slurry system used to study the relative effects of curing ingredients and additives used in pasteurized cured meats to control the growth of Clostridium botulinum.In ‘low’ pH slurries the rate of loss of nitrite fell with reducing storage temperature. Less residual nitrite remained after HIGH heat treatment but the rate of loss of that residual nitrite was slower during storage than nitrite remainly after LOW heat treatment. Inclusion of nitrate resulted in higher residual nitrite levels, particularly after HIGH heat and if stored below 20°C. If isoascorbate was added nitrite became undetectable within circa 30 days, even when nitrate had been added. The rate of loss of nitrite was slower in ‘high’ pH slurries (pH 6.3–6.8).Monitoring levels of nitrite in the product soon after production would detect its accidental overuse but monitoring nitrite in the product during distribution or at retail, without knowledge of the composition and prior history of the product, gives little indication of the amount used at manufacture. The level of residual nitrite was not directly related to the ability of the curing mixture to control the growth of CI. botulinum types A and B. Some slurries in which C1. botulinum grew least during 6 months’ storage contained no residual nitrite because isoascorbate was also present.