Título:	Simple colorimetric monitoring of chlorogenic acid in coffee washing water using Ag‑modified faujasite zeolite.
Autoria:	MALAFATTI, J. O. D. PARIS, E. C. MATTOSO, L. H. C.
Afiliação:	ELAINE CRISTINA PARIS, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA.
Ano de publicação:	2026
Referência:	Environmental Monitoring and Assessment, v. 198, 582, 2026.
Páginas:	17 p.
Conteúdo:	Silver-based materials are widely rec ognized for their optical, electronic, and chemical properties, which make them attractive for sensing applications. Among these materials, silver-modi fied zeolites stand out due to their high surface area, chemical and dispersion stability, and the possibility of tailoring surface interactions to improve affinity toward specific analytes. In this study, a faujasite zeo lite framework modified with silver ions (AgFAU) is investigated for colorimetric sensing of chlorogenic acid (CGA). The detection was carried out using a digital image colorimetry (DIC) approach, in which red, green, and blue (RGB) parameters were used for the quantitative optical analysis of colored dis persions. Based on the DIC analysis, CGA could be quantitatively monitored in the concentration range of 1–20 mg L−1, with a limit of detection in the range of 0.47–1.17 mg L−1 (average, 0.8 ± 0.3 mg L−1), consistent with values reported for similar col orimetric sensors. The proposed approach was suc cessfully applied to the detection of CGA in coffee wastewater. In addition, the system showed good specificity toward structurally related polyphenols and high reproducibility (RSD ≤ 6%), demonstrating its suitability as a simple and easy-to-interpret strat egy for CGA monitoring.
Palavras-chave:	Zeolite-based materials Colorimetric sensing Coffee water
Digital Object Identifier:	https://doi.org/10.1007/s10661-026-15430-x
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPDIA)