Kjeldahl method


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Kjeldahl method

[′kel‚däl ‚meth·əd]
(analytical chemistry)
Quantitative analysis of organic compounds to determine nitrogen content by interaction with concentrated sulfuric acid; ammonia is distilled from the NH4SO4 formed.
References in periodicals archive ?
The methods for analysis of proximate soft tissue composition for protein and lipid were conducted according to the Kjeldahl method (Chromy et al.
Nitrogen, Sulfur, pectin, lignin, cellulose and hemicellulose were determined for acid digestion according to Kjeldahl method, which consists in the destruction of the sample with concentrated sulfuric acid in boiling, thus separating the nitrogen from its bond matrix and transforming into ammoniacal nitrogen, with a heating period of 4.
25) was determined using semi-micro Kjeldahl method according to the AOAC procedure 978.
The protein content of the samples was analyzed using the analytical Kjeldahl method.
Moisture was determined by drying into an oven (Labostar-LG 122, Japan) at 105degC for 24 h; ash by burning in a muffle furnace (Isuzu, Japan) at 550degC for 18 h; crude protein by the Kjeldahl method (N x 6.
The protein content in the supernatant was determined by the Kjeldahl method and percent protein solubility was calculated as follows:
Nitrogen content of dried camel milk was determined by Kjeldahl method and then the value was multiplied by a factor 6.
The purpose of the analysis was to determine the crude protein contents and other characters (water, fat and ash) using Kjeldahl method to determined crude protein as reported in Association of Official Analytical Chemists (AOAC) [6].
The degree of hydrolysis (DH) was determined by the ratio of solubilized proteins in the hydrolysate (PS) and total protein (TP) present in the raw material, determined by the Kjeldahl method, and the results were expressed as a percentage (%).