Wiltshire curing with and without nitrate

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Abstract
Summary: The storage life of vacuum packed unsmoked bacons produced by a factory Wiltshire process from brines containing nitrite with and without nitrate has been studied at 5° and 15°C. Whilst collar bacon produced from typical bacon pigs and containing 76–129 ppm nitrite and approximately 5% salt kept slightly better when it also contained 538–568 nitrate, no consistent benefit was noted when the nitrate concentration was 196–204. Collar and back bacons with similar concentrations of nitrite and salt and produced from pigs in which the ultimate pH in the M. longissimus dorsi was ≥ 6.0 kept better when they also contained approximately 600 ppm nitrate. It is suggested that the benefit of nitrate in these bacons is due to the inhibition of bacterial growth by increased concentrations of nitrite produced from nitrate in relatively high pH muscles.

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