In-house method validation: Application in arsenic analysis

Souza, Scheilla Vitorino Carvalho de; Pinto, Carlos T.; Junqueira, Roberto Gonçalves

doi:10.1016/j.jfca.2006.09.002

Cited by 26 publications

(12 citation statements)

References 22 publications

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“…OLSM was used to calculate the values of the slope, intercept and variances for the solvent and matrix matched curves, with a previously check of the assumptions. The slopes of both curves were compared by t-test [27]. The interceptions were not compared due to the fact that the samples had a native concentration of the studied phenolics.…”

Section: Matrix Effectsmentioning

confidence: 99%

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Simultaneous analysis of 25 phenolic compounds in grape juice for HPLC: Method validation and characterization of São Francisco Valley samples

Natividade

Corrêa

Souza

et al. 2013

Microchemical Journal

114

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A HPLC method for simultaneous determination of 25 phenolic compounds in grape juice was optimized, validated and applied in the characterization of juices produced in São Francisco Valley (SFV), Brazil. The performance characteristics of the method were established by assays with standard solutions of phenolic compounds, spiked and unspiked samples. Linearity, matrix effects, trueness, precision, detection and quantification limits were evaluated. Linearity was demonstrated in the concentration ranges tested for all phenolic compounds. Significant matrix effects were not identified for the studied compounds. Mean recoveries ranged from 86.18 to 106.50%, demonstrating no lack of trueness. Precision of the method was confirmed for the 25 phenolic compounds, with acceptable repeatability relative standard deviations (from 0.71 to 9.24%) and within-reproducibility relative standard deviations (from 1.34 to 9.26%) for unspiked and spiked samples. The theoretical limits of detection and quantification of the method varied from 0.001 to 0.19 μg mL −1 and 0.003 to 0.37 μg mL −1 , respectively. The results of the validation process showed that the proposed method is fitness for purpose. This method was able to identify simultaneously 25 phenolic compounds and had advantages such as low consumption of solvents and easy sample preparation. The phenolic profile of the grape juices from SFV varied according the grape cultivar. Phenolics of the anthocyanins and tannins class predominated in red grape juices, while in white grape juice phenolic acids and tannins were found at high concentrations.

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Section: Matrix Effectsmentioning

confidence: 99%

“…Recovery and precision were studied as described by Souza et al [27]. Outliers were investigated by the application of the Grubbs test.…”

Section: Trueness (Recovery) and Precisionmentioning

confidence: 99%

Simultaneous analysis of 25 phenolic compounds in grape juice for HPLC: Method validation and characterization of São Francisco Valley samples

Natividade

Corrêa

Souza

et al. 2013

Microchemical Journal

114

View full text Add to dashboard Cite

show abstract

“…At another hand, a divalent anion HAsO 4 2− dominates at pH values of 8-11 [30]. Ca-OH attaching at bone char is a cation, which would combine with HAsO 4 2− anion.…”

Section: Adsorption Mechanismsmentioning

confidence: 99%

Study of arsenic(V) adsorption on bone char from aqueous solution

Chen

Chai

Shu

2008

Journal of Hazardous Materials

141

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“…The issue of chemical contaminants in food and beverages is addressed in Section 2 of this themed issue: aluminium (Jalbani et al, 2007); acrylamide (Tateo et al, 2007); nitrate and nitrite in bottled water (Cemek et al, 2007); and methods for rapid arsenic analysis (de Souza et al, 2007). Heavy metal contamination in foods and drinking water has been an important topic in JFCA ARTICLE IN PRESS 5 The HACCP system, which monitors critical steps in the food chain, has had a major impact on reducing contamination during food processing.…”

Section: Special Issue Of Jfca On Food Safety and Qualitymentioning

confidence: 99%