Homogeneity study of a corn flour laboratory reference material candidate for inorganic analysis

Santos, André Luíz dos; Santos, Liz Oliveira dos; Brandão, Geovani Cardoso; Leão, Danilo Junqueira; Bernedo, Alfredo Victor Bellido; Lopes, Ricardo Tadeu; Lemos, Valfredo Azevedo

doi:10.1016/j.foodchem.2015.01.024

Cited by 19 publications

(4 citation statements)

References 21 publications

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“…In order to verify the homogeneity of the material’s within-unit and between-unit homogeneity and to calculate the uncertainty in heterogeneity of materials, one-factor analysis of variance (one-way ANOVA) was conducted [ 19 – 21 ]. This statistical tool includes the criterion value ( F value ) and the critical value ( F critic ).…”

Section: Resultsmentioning

confidence: 99%

Exploration of optical fibres as a carrier for new benzene and toluene matrix-free reference materials

et al. 2015

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To meet high expectations concerning precision and accuracy of reference materials, preparation of matrix-free reference materials using thermal decomposition-gas chromatography-mass spectrometry (TD-GC-MS) was proposed in this study. In the paper, the results obtained in preparation of the new reference materials for benzene and toluene are presented, based on the thermal decomposition technique of compounds chemically bound to the surface of optical fibre segments. The results obtained at various stages of the research procedure (homogeneity, stability) confirmed the possibility of using prepared laboratory samples of materials as reference materials for benzene and toluene. For the prepared batch of materials, reference values 1.26 ± 0.91 (ng/fibre) for benzene and 11.3 ± 7.4 (ng/fibre) for toluene were determined.

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Section: Resultsmentioning

confidence: 99%

Exploration of optical fibres as a carrier for new benzene and toluene matrix-free reference materials

et al. 2015

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“…Another important factor to be taken into consideration in the selection of the decomposition method for a sample is the kind of technique that will be applied to quantify the analyte. Dry sample decomposition techniques, that is, by calcification, present a series of inconveniences, such as risks of contamination, loss of volatile analytes and the considerable amount of time spent on eliminating organic matter, making the process very slow (SANTOS et al, 2015). Therefore, procedures which reduce the preparation time and allow for the analysis of a larger number of samples are noteworthy.…”

Section: Optimization Of the Digestion Processmentioning

confidence: 99%

“…The digested product was then cooled, diluted and maintained in an ultrasonic bath for a few seconds. Santos et al (2015) carried out a study on the homogeneity of the wheat flour samples in order to obtain reference material to ensure reliability of the measurements of the nine elements. For this purpose, 2.0 g of sample were inserted into digestion tubes containing 2.0 mL of HNO 3 and 1.0 mL of H 2 O 2 , and the mixture heated on a block digester until a clear solution was obtained.…”

Section: Introductionmentioning

confidence: 99%

Fast method to determine the elements in maize flour: reduction in preparation time and reagent consumption

Filho

Butik

Jaski

et al. 2017

Braz. J. Food Technol.

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The aim of this work was to develop and validate methodology to reduce the digestion time and reagent consumption in the determination of minerals in maize flour. The standard methodology employed in Brazil is that described by AOAC. It consists of the calcination of the sample at high temperatures for a long period of time, making the process expensive and slow. In this work, a wet sample digestion method using HNO 3 was employed, heating on a block digester with final dissolution in an ultrasonic bath. The validation tests involved linearity and working range studies, and the determination of the detection and quantification limits, accuracy and precision. The sample digestion time was 1:30 h and the percent recoveries for the metals were 93% for Ca, 98% for Cu, 110% for Fe, 97% for Mg, 101% for Mn and 106% for Zn. Keywords: Metals; Maize flour; Acid digestion; Sonification.Resumo O objetivo deste trabalho consiste em desenvolver e validar uma metodologia que reduza o tempo de digestão e o consumo de reagentes para determinar minerais em farinha de milho. No Brasil, a metodologia padrão utilizada é a descrita pelo AOAC, que consiste na calcinação da amostra em altas temperaturas, por longo período, o que torna o processo dispendioso e moroso. Neste trabalho, aplicou-se a digestão por via úmida das amostras usando HNO 3 , aquecimento em bloco digestor e solubilização final em banho ultrassom. Os testes de validação envolveram estudos de linearidade e faixa de trabalho, limites de detecção e de quantificação, precisão e exatidão. O tempo de digestão das amostras foi de 1h30min e as porcentagens de recuperação dos metais foram de 93% para Ca, 98% para Cu, 110% para Fe, 97% para Mg, 101% para Mn e 106% para Zn. Palavras

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“…With the view to attempting to fill some of the gaps, there is a need to contribute to the technological development of the country, increasing the availability of new reference material in various areas have become targets of researchers and institutions [5,6]. In this context, the preparation and characterization of a bovine liver candidate reference material were performed, according to with ISO GUIDE series 30-35 [2,7-10].…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of a bovine liver candidate reference material

Bianchi

Peixoto

Souza

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. The preparation of a bovine liver candidate reference material and the steps are taken to confirm its homogeneity, long and short term stabilities, and consensus values are described. Details of the sample preparation and the final collaborative exercise are presented. The material elemental composition was characterized by 17 elements (As, Ca, Cd, Co, Cu, Fe, K, Mg, Mo, Mn, Na, P, Pb, Se, Sr, V, and Zn) of nutritional and toxicological significance.

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Homogeneity study of a corn flour laboratory reference material candidate for inorganic analysis

Cited by 19 publications

References 21 publications

Exploration of optical fibres as a carrier for new benzene and toluene matrix-free reference materials

Exploration of optical fibres as a carrier for new benzene and toluene matrix-free reference materials

Fast method to determine the elements in maize flour: reduction in preparation time and reagent consumption

Production and characterization of a bovine liver candidate reference material

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