Percent crude protein by Kjeldahl method

Formula

Percent crude protein by Kjeldahl method formula
p
percentage of crude protein
F
protein factor (6.38 for milk and dairy; 6.25 for all forages and feeds except wheat grains; 5.70 for wheat grains;5.95 for rice)
B
ml NaOH back titration of blank
S
ml NaOH back titration of sample
N
normality of NaOH
W
weight of sample in grams

Formula description

Estimate the crude protein by Kjeldahl method. Crude Protein (CP) is the total protein equivalent including nitrogen from both protein and non-protein sources. Protein factors: 6.38 for milk and dairy; 6.25 for all forages and feeds except wheat grains; 5.70 for wheat grains,wheat flour;5.95 for rice. Please pay attention to the units used in the calculator.

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Percent crude protein by Kjeldahl method formula
F
B
S
N
W
p
Precision

Formula code

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References

  1. Wikipedia: Johan Kjeldahl.
  2. Wikipedia: Kjeldahl method.

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