Journal of the American Oil Chemists’ Society

, Volume 33, Issue 8, pp 360-363

First online:

Urease activity in soybean meal products

  • Allan K. SmithAffiliated withNorthern Utilization Research Branch
  • , Paul A. BelterAffiliated withNorthern Utilization Research Branch
  • , Robert L. AndersonAffiliated withNorthern Utilization Research Branch

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A method which uses direct titration of ammonia as a measure of urease activity was modified for use in the assay of raw and of slightly denatured soybean meal. The modifications which were adopted were the use of glutathione, a presoaking of the sample for 30 min. at 40°C., and making of the assay at 40°C. Data on the urease activity of several varieties of soybeans, and for immature and frost-damaged soybeans were determined.