Variation in Nitrogen-to-Protein Conversion Factor for Peanut

Mishra, J.B. (2001) Variation in Nitrogen-to-Protein Conversion Factor for Peanut. Peanut Science, 28 (2). pp. 48-51.

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For peanut, a factor of 5.46 is used for converting nitrogen concentration into protein concentration because the peanut proteins arachin and conarachin contain 18.31% nitrogen. Using published reports on the amino acid composition of peanut genotypes, the nitrogen-to-protein conversion factors (NPCF) for arachin and conarachin, as well as for whole peanut kernel were calculated. The value of NPCF for arachin varied between 5.271 and 5.563 and that for conarachin from 5.076 to 5.496. The location of crop growth may significantly affect the value of NPCF for whole kernels. For the samples of various genotypes grown at various locations, the values of NPCF varied between 5.3 and 5.7. Thus, the protein content obtained by using the conventional factor of 5.46 would have a precision of ± 0.7% for samples having 3.5% N (approx. 18% protein). As the nitrogen content increases, the precision decreases to reach ± 1.1% for samples having 5.5% N (approx. 30% protein). This implies that the protein contents of peanut calculated on the basis of a fixed conversion factor would be significantly different only when they differ by 1.4 to 2.2% in the calculated values. Therefore, use of a fixed NPCF for comparison of concentration of protein in samples emanating from breeding or agronomic trials may be erroneous, especially when samples differ only marginally in their protein concentrations. Research will be required to determine the relationship between the nitrogen concentration of peanut kernel samples and their protein concentration.

Item Type: Article
Uncontrolled Keywords: Arachis hypogaea L., groundnut.
Author Affiliation: National Reserach Centre for Groundnut, Ivanagar Rd., Post Box No. 5, Junagadh-362001, Gujarat, India
Subjects: Plant Production > Croping Systems
Soil Science and Microbiology > Soil Sciences
Statistics and Experimentation > Statistial Methods
Divisions: Groundnut
Depositing User: Mr. SanatKumar Behera
Date Deposited: 17 Mar 2012 10:50
Last Modified: 17 Mar 2012 10:50
Official URL:

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