Spectrophotometric determination of nitrate in baby foods: collaborative study

Anna-Maija Sjöberg, Timo Alanko

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A collaborative study was conducted of a spectro-photometric method for determination of nitrate after cadmium reduction to nitrite in baby foods containing meat. Thirty-one municipal and 2 industrial food laboratories participated in the study. The study design involved 2 baby food matrices. Samples of both matrices were prepared at 3 concentration revels between 52 and 309 mg NaNO3/kg as blind duplicates. A blank without added nitrate was also included. The outlier percentage of the results was very low (4.3%). It was typical for the method that recoveries were slightly >100%. Recoveries for baby foods varied between 113.3 and 116.9%, and were acceptable for control purposes. The relative standard deviations for repeatability were 5.0-18.1%. The relative standard deviations for reproducibility were 8.3-21.6%. Three collaborators also evaluated liquid chromatographic technique for nitrate determinations. These preliminary results are presented but are not analyzed statistically. The spectrophotometric method was adopted first action by AOAC INTERNATIONAL.
Original languageEnglish
Pages (from-to)425-430
Number of pages6
JournalJournal of AOAC International
Volume77
Issue number2
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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infant foods
Nitrates
nitrates
nitrate
Food
food
food matrix
Recovery
reproducibility
repeatability
nitrites
recovery method
matrix
Meats
cadmium
chromatography
Nitrites
experimental design
outlier
methodology

Cite this

Sjöberg, Anna-Maija ; Alanko, Timo. / Spectrophotometric determination of nitrate in baby foods: collaborative study. In: Journal of AOAC International. 1994 ; Vol. 77, No. 2. pp. 425-430.
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title = "Spectrophotometric determination of nitrate in baby foods: collaborative study",
abstract = "A collaborative study was conducted of a spectro-photometric method for determination of nitrate after cadmium reduction to nitrite in baby foods containing meat. Thirty-one municipal and 2 industrial food laboratories participated in the study. The study design involved 2 baby food matrices. Samples of both matrices were prepared at 3 concentration revels between 52 and 309 mg NaNO3/kg as blind duplicates. A blank without added nitrate was also included. The outlier percentage of the results was very low (4.3{\%}). It was typical for the method that recoveries were slightly >100{\%}. Recoveries for baby foods varied between 113.3 and 116.9{\%}, and were acceptable for control purposes. The relative standard deviations for repeatability were 5.0-18.1{\%}. The relative standard deviations for reproducibility were 8.3-21.6{\%}. Three collaborators also evaluated liquid chromatographic technique for nitrate determinations. These preliminary results are presented but are not analyzed statistically. The spectrophotometric method was adopted first action by AOAC INTERNATIONAL.",
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Spectrophotometric determination of nitrate in baby foods: collaborative study. / Sjöberg, Anna-Maija; Alanko, Timo.

In: Journal of AOAC International, Vol. 77, No. 2, 1994, p. 425-430.

Research output: Contribution to journalArticleScientificpeer-review

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