The International Harmonized Protocol for the Proficiency Testing of Analytical Chemistry Laboratories

Thompson, Michael; Ellison, Stephen L. R.; Wood, Roger; Middlesex, Teddington

doi:10.1515/iupac.78.0001

Cited by 80 publications

(125 citation statements)

References 17 publications

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“…Therefore, either correction factor can be used to quantify these FAs in edible vegetable oils, as stated by Mosoba and Kramer (2009), and confirmed from the values calculated using both correction factors (p>0.05). Z score results were satisfactory according to Thompson et al (2006). All the mean values for the seven certified FAMEs were ≤2 z, which confirms the homo genity of these results.…”

Section: Bcr-163 Certifi Ed Reference Materialssupporting

confidence: 70%

“…In the five laboratories, the z score was calculated for each one of the seven certified FAMEs of the reference certified material BCR 163, using their respective calculated ECF, according to IUPAC (Thompson et al, 2006). ANOVA statistical analysis at 95% confidence was used for testing if there were significant differences among the values obtained for the certified FAMEs using ECF and TCFr and applying the Statgraphics Plus 5.1 statistical program.…”

Section: Discussionmentioning

confidence: 99%

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Fatty acid composition of soybean/sunflower mix oil, fish oil and butterfat applying the AOCS Ce 1j-07 method with a modified temperature program

et al. 2015

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SUMMARY:Gas-Liquid Chromatography (GLC) methods such as AOAC Fat in foods 966.06 (2005), AOCS Official Methods Ce 1h-05 (2005), Ce 1j-07 (2007), allow for analyzing the fatty acids (FAs) in dietary fats using highly polar liquid phase capillary columns. However, there are still difficulties in completely separating butiric acid from solvent, FA critical pairs with similar polarity, conjugated linoleic acid (CLA) isomers, and long chainpolyunsaturated FAs (LC-PUFAs). Therefore, the selection of the temperature program to be employed is important. This work aimed to improve the AOCS Ce 1j-07 Method for the FA composition of a mixture of soybean and sunflower oil, fish oil, and butterfat, using a modified temperature program, tested among five laboratories. It takes more time, but it allows to completely separate butyric acid from the solvent, trans-18:1 from cis-18:1, 20:1 isomers from 18:3 n-3, 22:1 n-9 from 20:4 n-6, 20:5 n-3 from 24:0 and the main CLA isomers, thus permitting FA quantification in fats and oils for different purposes such as nutritional labeling, quality control and research. (2007) permiten determinar ácidos grasos (AG) en matrices grasas usando columnas capilares altamente polares y distintos programas de temperatura. No obstante, aún existen dificultades para separar ácido butírico del solvente, pares críticos de AG con polaridades similares, isómeros del ácido linoleico conjugado (CLA), AG de cadena larga poliinsaturados (LC-PUFAs). El objetivo fue mejorar el Método AOCS Ce 1j-07 aplicándolo a la composición en AG de mezcla de aceite soja/girasol, aceite de pescado, mantequilla, usando un programa de temperatura modificado, entre cinco laboratorios. El programa de temperatura elegido, si bien emplea más tiempo, permite separar completamente ácido butírico del solvente, trans-18:1 de cis-18:1, isómeros 20:1 de 18:3 n-3, 22:1 n-9 de 20:4 n-6, 20:5 n-3 de 24:0, los principales isómeros CLA. Esta propuesta permite cuantificar AG con diferentes propósitos, entre ellos, etiquetado nutricional, control de calidad e investigación.

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Section: Bcr-163 Certifi Ed Reference Materialssupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Fatty acid composition of soybean/sunflower mix oil, fish oil and butterfat applying the AOCS Ce 1j-07 method with a modified temperature program

et al. 2015

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“…Homogeneity and stability were examined from the means and relative standard deviations by (1) comparisons with predefined tolerances, (2) Cochran′s test [1,4], and (3) a one-way ANOVA test [5,6].…”

Section: Methodsmentioning

confidence: 99%

“…Appropriate statistical techniques should be used to evaluate homogeneity testing data. One suitable approach is the International Harmonized Protocol for the Proficiency Testing of (Chemical) Analytical Laboratories, cooperatively produced by ISO and IUPAC [1].…”

Section: Introductionmentioning

confidence: 99%

Interlaboratory comparison material homogeneity testing

et al. 2015

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Abstract:The homogeneity of fertilizer samples for interlaboratory γ-ray spectrometry comparison was tested by determination of the total γ count rate and the count rates for two Ra line. Homogeneity testing was accomplished by determination of the minimum, maximum, mean and standard deviation for each parameter and comparison of their standard deviations with predefined tolerances, by Cochran's test, and by a one-way ANOVA. The standard deviations were all less than these tolerances. All samples passed Cochran's test and the one-way ANOVA test for homogeneity.

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“…Los ensayos de aptitud de macronutrientes constituyen una herramienta indispensable en la validación de los métodos analíticos [41][42][43] . El valor HORRAT, definido como la relación entre la desviación estándar de la reproducibilidad y la función de Horwitz (s R /H), muestra que los valores hallados se encuentran en el intervalo 0,5<Hs R <2.0 44 , lo que indica que los procedimientos de ensayo tienen una veracidad satisfactoria.…”

Section: Validación De Procedimientos Analíticosvunclassified

Validación y acreditación de procedimientos analíticos de macronutrientes: aplicación al análisis nutricional en purés de dietas geriátricas

Grana

2015

Sanid. Mil.

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The International Harmonized Protocol for the Proficiency Testing of Analytical Chemistry Laboratories

Cited by 80 publications

References 17 publications

Fatty acid composition of soybean/sunflower mix oil, fish oil and butterfat applying the AOCS Ce 1j-07 method with a modified temperature program

Fatty acid composition of soybean/sunflower mix oil, fish oil and butterfat applying the AOCS Ce 1j-07 method with a modified temperature program

Interlaboratory comparison material homogeneity testing

Validación y acreditación de procedimientos analíticos de macronutrientes: aplicación al análisis nutricional en purés de dietas geriátricas

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