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J Dent Res 40(2): 355-365, 1961
© 1961 International and American Associations for Dental Research
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Nitrate Reduction in Whole Saliva

PAUL W. GOAZ 1 and HELEN A. BISWELL 1

1 Dental Section, Oklahoma Medical Research Institute, Oklahoma City, Oklahoma

Endogenous and added nitrate is rapidly reduced by incubating saliva. The progressive decrease in salivary and added nitrate is accompanied by a transient accumulation (and apparent reduction) of nitrite.

The nitrate-nitrite reductase systems in saliva are present in the sediment, with components of the supernatant serving as hydrogen donors. Yeast extract, pyruvate, or lactate will replace the necessary elements of the electron donor system normally occurring in the supernatant.

The reduction of nitrate through nitrite is markedly affected by pH, with maximum activity demonstrated between 6.0 and 6.4.

Although nitrate reduction is little affected by the presence of oxygen, nitrite reduction is completely inhibited in aerated, incubating saliva.

In a limited survey of 40 young adults, no relationship between caries experience (DMF) and the capacity of the individual's saliva to reduce nitrate through nitrite was found.

Submitted on August 22, 1960




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