Paper-based analytical device for colorimetric detection of Cu2+ in Brazilian sugarcane spirits by digital image treatment

Using a cotton thread-based colorimetric sensor modified by carboxymethylcellulose and cuprizone with smartphone detection for quantification of copper

“…The colorimetric method proposed in this study, which involved the use of a novel colorimetric sensor based on cotton thread with preconcentration, for the determination of cupric ions was compared with other methods recently reported in the literature that also employ cellulosic materials; this comparative analysis is shown in Table S2. † 9,21,[53][54][55] The results show that the values of the parameters, such as limit of detection, linearity and concentration range, obtained from the application of the proposed method were comparable with those of the methods previously reported in the literature.…”

A Green Analytical Methodology for Detecting Adulteration in Automotive Urea-SCR Products Using Microfluidic-Paper Analytical Devices

“…Colorimetric reactions performed on filter paper surfaces are an excellent alternative to identify chemical compounds that have been employed for several analytical applications [15,16]. Additionally, the color intensity analysis via the association of the colorimetric reaction with digital image treatment enables the development of quantitative methods with fast responses, minimum usage of reagents, low cost, high selectivity, and straightforward operation [17].…”

Desenvolvimento de estratégias analíticas limpas para a determinação de proteína e ureia em alimentos

“…A combinação dos três canais do modelo RGB resulta em mais de 16 milhões de tonalidades de cores diferentes (256 3 ). Alguns exemplos de aplicações são a quantificação de açúcar redutor em bebidas (TEIXEIRA; SANTOS, 2022), determinação de gordura em produtos cárneos curados(CRUZ-FERNÁNDEZ et al, 2017), detecção da toxicidade de águas residuais(LI et al., 2023) e determinação de cobre em cachaça(FERNANDES et al, 2020a).Outro espaço de cor usual para obter a informação analítica é o modelo HSV, definidos por matiz (H), saturação (S) e luminosidade (V)(CAPITAN-VALLVEY et al, 2015;FERNANDES et al, 2020b). A matiz está relacionada com a cor do objeto, ou seja, com faixa de comprimento de onda da radiação absorvida, podendo variar de 0 a 360 o .…”