Given the importance of reference materials (RM) in the structuring and maintenance of quality management systems for food analysis laboratories, RM were produced for the measurement of moisture, ash, total fat, and titratable acidity in whole milk powder. Two types of packaging and three storage temperatures were evaluated. The RM were considered homogeneous. The materials that were packaged in the pouches and those packaged in the amber glass bottles with screw caps (stored at room temperature) were not stable for moisture. Nevertheless, considering the four measurands, the amber glass bottles under refrigeration and freezing temperatures were the best packaging and storage conditions, respectively. Homogeneity and stability studies were carried out according to the ISO Guide 35, IUPAC harmonized protocol, and ISO 13528, considering the potential applicability of the produced materials as certified reference materials or even as RM for use in proficiency testing schemes. For homogeneity, despite the different criteria, there was agreement between the results. Considering the stability, the agreement depended on the evaluation of the regression assumptions, which is not required by the ISO Guide 35. The contribution of uncertainty associated with homogeneity was greater than that related to stability. The results indicated that the produced materials, i.e., the candidate certified RMs, were suitable for assessing trueness and could be submitted to further inter-laboratory characterization.
A alergia alimentar consiste em uma reação imuno mediada decorrente da ingestão de um alimento alergênico por um indivíduo sensível. Ela pode se manifestar de forma branda, com sintomas cutâneos e gastrointestinais, contudo pode levar a consequências graves como a anafilaxia. Como ainda não existe cura para a alergia alimentar e os tratamentos disponíveis não possuem segurança e eficácia suficientes, a restrição do consumo do alimento alergênico é a intervenção mais apropriada. Portanto, os indivíduos alérgicos dependem de informações apresentadas nos rótulos dos alimentos para escolher, de maneira segura, quais produtos consumir. Dessa forma, muitos países tornaram obrigatória a declaração dos principais alimentos causadores de alergia na rotulagem de produtos embalados. O presente trabalho traz uma análise dos aspectos regulatórios deste tema em diferentes países. Foi possível evidenciar a evolução dos requisitos regulamentares, embora diferenças substanciais sejam desfavoráveis ao comércio internacional e à segurança dos alimentos.
Neutralization with alkaline compounds is one of the most common adulterations in milk. The rosolic acid method is a classical test widely used in different countries for detection of neutralizers in milk. The official and a modified version were validated in a single laboratory validation process considering four adulterants: sodium bicarbonate(BI), sodium carbonate(CA), sodium hydroxide(HY) and sodium citrate(CI). The modified version, which presented better performance was selected for interlaboratory validation. In this process, samples of raw milk with acidities of 0.19% were neutralized with different concentrations of BI, CA, HY and C and tested for homogeneity and stability. Eight laboratories, which represented different sectors of the milk production chain, received and analysed these samples. The collaborative trial results confirmed the method performance, although sensitivity and precision were inferior to those obtained in the intralaboratory process, demonstrating its applications and limitations
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.