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O trabalho desenvolvido durante o estágio para a conclusão do curso de Mestrado em Engenharia Biológica e Química teve como principal objetivo a comparação entre diferentes métodos analíticos de determinação da cor de xaropes de açúcar médio invertido, com destaque para os métodos ICUMSA, EBC e SRM. O estudo foi desenvolvido em colaboração com a empresa Glucos Internacional, onde atualmente desempenho funções no laboratório como técnica de controlo de qualidade, e teve como objetivos específicos: i) Avaliar a equivalência ou diferenças entre os métodos de análise de cor; ii) Estudar a repetibilidade e a reprodutibilidade dos resultados obtidos; iii) Analisar a rentabilidade financeira de cada método, considerando custos e tempo de execução; iv) Identificar o método mais adequado para a quantificação da cor em xaropes de açúcar invertido. O trabalho foi desenvolvido em diferentes fases: inicialmente realizou-se a caracterização cromática dos lotes de xarope de açúcar invertido, seguindo-se a avaliação da precisão analítica e, por fim, a análise financeira associada a cada método em estudo. Os resultados evidenciaram que um dos lotes em estudo apresentou consistentemente os valores mais elevados de cor em todos os métodos e dias de ensaio, enquanto os valores mais baixos variaram entre lotes, confirmando diferenças na sensibilidade de cada procedimento. Todos os métodos apresentaram resultados satisfatórios em termos de repetibilidade e reprodutibilidade, confirmando a sua robustez. No caso do SRM e do EBC, os valores foram avaliados segundo os limites estabelecidos pela norma ISO 5725-2:2019, evidenciando elevada estabilidade dos resultados. Já o método ICUMSA foi o único a apresentar valores normativos específicos da sua própria metodologia, demonstrando conformidade rigorosa com os critérios técnicos definidos e assegurando uma avaliação fiável das características físico-químicas das amostras. Por fim, na análise financeira, o método SRM foi o mais rentável, seguido do método EBC e do método ICUMSA, que, apesar do custo superior, mantém importância normativa e comercial por ser internacionalmente reconhecido como método de referência e pela abrangência da sua aplicação. Assim, a escolha da metodologia deverá resultar de um equilíbrio entre rigor analítico, exigências normativas e viabilidade económica, permitindo à empresa adaptar-se de forma flexível às necessidades específicas do mercado.
The work carried out during the internship for the completion of the Master’s degree in Biological and Chemical Engineering had as its main objective the comparison between different analytical methods for determining the color of medium inverted sugar syrups, with emphasis on the ICUMSA, EBC, and SRM methods. The study was developed in collaboration with the company Glucos Internacional, where I currently work in the laboratory as a quality control technician, and had the following specific objectives: i) To evaluate the equivalence or differences between the color analysis methods; ii) To study the repeatability and reproducibility of the results obtained; iii) To analyze the financial profitability of each method, considering costs and execution time; iv) To identify the most suitable method for quantifying color in inverted sugar syrups. The work was carried out in different phases: initially, the chromatic characterization of the batches of inverted sugar syrup was performed, followed by the evaluation of analytical precision, and finally, the financial analysis associated with each method under study. The results showed that one of the batches consistently presented the highest color values across all methods and testing days, while the lowest values varied between batches, confirming differences in the sensitivity of each procedure. All satisfactory methods presented results in terms of repeatability and reproducibility, confirming their robustness. In the case of SRM and EBC, the values were evaluated according to the limits established by ISO 5725-2:2019, showing high stability of the results. The ICUMSA method, on the other hand, was the only one to present specific normative values of its own methodology, demonstrating strict compliance with the defined technical criteria and ensuring a reliable assessment of the physicochemical characteristics of the samples. Finally, in the financial analysis, the SRM method proved to be the most cost-effective, followed by the EBC method and the ICUMSA method, which, despite its higher cost, retains normative and commercial importance as it is internationally recognized as a reference method and for the breadth of its application. Thus, the choice of methodology should result from a balance between analytical rigor, normative requirements, and economic viability, allowing the company to adapt flexibly to the specific needs of the market.
The work carried out during the internship for the completion of the Master’s degree in Biological and Chemical Engineering had as its main objective the comparison between different analytical methods for determining the color of medium inverted sugar syrups, with emphasis on the ICUMSA, EBC, and SRM methods. The study was developed in collaboration with the company Glucos Internacional, where I currently work in the laboratory as a quality control technician, and had the following specific objectives: i) To evaluate the equivalence or differences between the color analysis methods; ii) To study the repeatability and reproducibility of the results obtained; iii) To analyze the financial profitability of each method, considering costs and execution time; iv) To identify the most suitable method for quantifying color in inverted sugar syrups. The work was carried out in different phases: initially, the chromatic characterization of the batches of inverted sugar syrup was performed, followed by the evaluation of analytical precision, and finally, the financial analysis associated with each method under study. The results showed that one of the batches consistently presented the highest color values across all methods and testing days, while the lowest values varied between batches, confirming differences in the sensitivity of each procedure. All satisfactory methods presented results in terms of repeatability and reproducibility, confirming their robustness. In the case of SRM and EBC, the values were evaluated according to the limits established by ISO 5725-2:2019, showing high stability of the results. The ICUMSA method, on the other hand, was the only one to present specific normative values of its own methodology, demonstrating strict compliance with the defined technical criteria and ensuring a reliable assessment of the physicochemical characteristics of the samples. Finally, in the financial analysis, the SRM method proved to be the most cost-effective, followed by the EBC method and the ICUMSA method, which, despite its higher cost, retains normative and commercial importance as it is internationally recognized as a reference method and for the breadth of its application. Thus, the choice of methodology should result from a balance between analytical rigor, normative requirements, and economic viability, allowing the company to adapt flexibly to the specific needs of the market.
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Palavras-chave
Açúcar invertido Cor ICUMSA EBC SRM Repetibilidade Reprodutibilidade. Inverted sugar Color Repeatability Reproducibility