Microscopic evaluation of coffee commercial samples

• Autor(a) principal: Assis, Nadinne Medeiros
• Data de Publicação: 2020
• Outros Autores: Marques, Carlos Alexandre, Silva, Michelle Costa da
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Segurança Alimentar e Nutricional (Online)
• Texto Completo: https://periodicos.sbu.unicamp.br/ojs/index.php/san/article/view/8658921
• topic: Coffe; Quality; Adulterations; Food microscopy; Café; Qualidade; Adulterações; Microscopia alimentar; Café; Calidad; Adulteraciones; Microscopía alimentaria

This paper aimed to evaluate the quality of some commercial coffee samples, through microscopic characterization and gravimetric detection of possible dirtiness and adulterants. Commercial coffee samples, belonging to four distinct brands, were purchased commercially and analyzed in triplicates. In this study, microscopic analyzes were performed using a stereoscopic and photonic microscope, following the usual methodology. Analyzes by scanning electron microscopy (SEM) with detection of chemical elements by X-ray dispersion (EDS) coupled were also performed. The quantification of barks and pieces of sticks was made by gravimetric analysis, following the methodology of the Ezequiel Dias Foundation (MG). In all brands, undesirable vegetable fragments were identified, such as coffee tree peels and sticks and dirt considered to be without risk to human health. In the gravimetric analysis, fragments of coffee trees were quantified in three of the four brands analyzed. In the SEM/EDS analysis to identify the presence of possible metal fragments, the four brands showed the presence mainly of iron particles, in addition to other metals in a smaller proportion. It is concluded, therefore, that all brands presented non-conformities regarding the presence of adulterants, according to the ABIC program, however, they are in compliance with the current legislation because they do not present a risk to human health.