Browsing by Author "Deleg Juela, Juan Patricio"

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Desarrollo de un patrón secundario en base de arroz para el análisis proximal
(Universidad de Cuenca, 2023-03-16) Deleg Juela, Juan Patricio; Mora Campoverde, Dennis Katherine; Ortiz Ulloa, Silvia Johana
Quality control in laboratories is performed to ensure that the results obtained are reliable and meet the quality standards for each analytical method. To perform quality control, primary or secondary standard substances are used. The disadvantages of primary standards are their high cost and limited accessibility, so secondary standards are developed to overcome these drawbacks. The objective of this degree work was to develop a rice-based secondary standard to serve as a reference for routine analytical runs of proximate analysis. Fifteen replicates were analyzed for each parameter, and the coefficient of variation was less than 15% in all cases. With the results obtained, Levey-Jennings plots were constructed for each parameter, which will serve as a reference for future analyses. For the interpretation of the graphs, the Westgard rules were used to evaluate systematic errors in the analytical process. Finally, an example of the application of the Levey-Jennings graphs and the Westgard rules was presented in this work, using the values of the replicates as if they were samples. On this basis, the variations observed in the ash and fat values violated the 12s rule which, being a warning rule, does not suggest the rejection of the series. On the other hand, the graphs for moisture, dry matter and protein complied with the rules, indicating that the analytical processes employed were performed with high precision.