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This article in AJ

  1. Vol. 61 No. 2, p. 332-333
    Received: June 13, 1968

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Colorimetric Determination of Protein in Feed and Forage Crops1

  1. Arnold J. MacKenzie and
  2. Eugene R. Perrier2



A colorimetric method using Orange G dye for the determination of protein in feed and forage crops is described. With each of six crops tested, a good correlation was found between Kjeldahl nitrogen percentage and the dye-binding characteristics of the plant proteins. The method is reproducible, rapid and easily adapted to a simplified routine operation.

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