Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study.

Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Research Abstract Details 

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Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Abstract Text:

The objective of this collaborative study was to determine interlaboratory performance statistics for a modified and optimized version of AOAC Method 920.123 for the determination of the total nitrogen content of hard, semihard, and processed cheese by Kjeldahl analysis. Details included addressing the issues of material homogeneity, test portion size (1 g), quantitative transfer (weighing on to filter paper), ensuring system suitability (nitrogen recoveries), and using AOAC Method 991.20 as the basis for nitrogen analysis. Fifteen laboratories tested 18 pairs of blind duplicate cheese materials with a crude protein content between 18 and 36%. Materials represented hard, semihard, and processed commercial cheeses with a wide range of composition. Statistical performance parameters expressed as crude protein (nitrogen x 6.38), g/100 g, with invalid and outlier data removed were mean = 26.461, repeatability standard deviation (Sr) 0.111, reproducibility standard deviation (S(R)) = 0.153, repeatability relative standard deviation (RSDr) = 0.42%, reproducibility relative standard deviation (RSDR) = 0.58%, repeatability (r) = 0.312, and reproducibility (R) = 0.428. The interlaboratory study results were acceptable and comparable to those for the milk Kjeldahl nitrogen method on a relative nitrogen basis. The Study Directors recommend that this modified method for the determination of total nitrogen in hard, semihard, and processed cheese by Kjeldahl analysis be adopted First Action as an improved method to replace Method 920.123.

Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Publishing Authors By Initials

For similar inorganic chemicals: elements: nitrogen research abstracts see: inorganic chemicals: elements: nitrogen research

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Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of AOAC International

VOLUME: 85

Page Numbers: 445-55

Journal Abbreviation: J AOAC Int

ISSN: 1060-3271

DAY: 17

MONTH: 03

YEAR: 2008

Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Information

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LANGUAGE: eng

NlmUniqueID: 9215446

Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Keywords Mesh Terms:

KEYWORDS: Nitrogen

MESH TERMS: analysis

Chemical & Substance for Abstract: Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study. Information

Substance Name: Nitrogen

Registry Number: 7727-37-9

Grant and Affiliation Information for Determination of the total nitrogen content of hard, semihard, and processed cheese by the Kjeldahl method: collaborative study.

AFFILIATION: Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY 14853, USA. jL72@cornell.edu

Country: United States

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MEDLINETA: J AOAC Int

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