Formation of Nitrite in the Stomach Contents of Monkeys Administered Sodium Nitrate Solution Orally in Relation to the Stomach Microflora

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  • 硝酸ナトリウム投与サルの胃内における硝酸および亜硝酸イオンの消長と微生物群について
  • ショウサン ナトリウム トウヨ サル ノ イナイ ニ オケル ショウサン オヨ

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Reduction of nitrate to nitrite was investigated in the stomachs of five monkeys which were starved for one day before force-feeding with 20ml/kg of brain-heart infusion broth containing 5, 000ppm of sodium nitrate. The concentration of NO2-, the pH, and the types of microorganisms in the sampled stomach contents were chemically and microbiologically determined at 1, 3, 5, and 7 hours after the administration of sodium nitrate.<BR>The results of the investigations were as follows:<BR>1) A peak of nitrite formation appeared at 5 hours after the administration of sodium nitrate, but very different levels of nitrite were found in the different monkeys: 96.6, 94.1, 69.1, 3.2, and 377.9ppm.<BR>2) Microorganisms similar to those inhabiting the oral cavity of monkeys, as reported by other investigators, were isolated from the stomach contents in this experiment. This suggests that nitrate reduction in the stomach can be attributed to anaerobic nitrate-reducing bacteria passed down from the oral cavity.<BR>3) The pH of the stomach contents ranged from 5.2 to 6.6, which is probably suitable for the reduction of nitrate. There was a significant correlation between the pH level of the stomach contents and the production of nitrite in the stomach.

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