Antonie van Leeuwenhoek

, Volume 38, Issue 1, pp 505–512 | Cite as

Oxidation of nitrite and hydroxylamine byAspergillus flavus, peroxidase and catalase

  • J. A. E. Molina
  • M. Alexander
Article

Abstract

Nitrite is oxidized to nitrate by high concentrations of beef-liver catalase and byAspergillus flavus hyphal extracts. From 80 to 90 % of the nitrite-nitrogen is recovered as nitrate. The fungal enzyme is soluble and non-cytochrome-linked. It is distinct from the fungal catalase and apparently acts peroxidatively.

Hydroxylamine is metabolized by high concentrations of catalase, and about half of the hydroxylamine which disappears is recovered as nitrate. Horseradish peroxidase catalyzes the formation of nitrate in the presence of hydroxylamine, apparently by oxidizing a product of the spontaneous decomposition of the nitrogen compound.A. flavus extracts do not oxidize hydroxylamine.

Keywords

Nitrogen Nitrate Nitrite Catalase Horseradish Peroxidase 

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Copyright information

© Swets & Zeitlinger 1972

Authors and Affiliations

  • J. A. E. Molina
    • 1
  • M. Alexander
    • 1
  1. 1.Laboratory of Soil Microbiology, Department of AgronomyCornell UniversityIthacaUSA

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