Details

Autor(en) / Beteiligte

• Jia, Fangfang
• Liu, Qingyun
• Chen, Zhengbo
• Wei, Wei

Titel

Colorimetric determination of nine metal ions based on the de-aggregation of papain-functionalized gold nanoparticles and using three chelating agents

Ist Teil von

• Mikrochimica acta (1966), 2019-12, Vol.186 (12), p.854-854, Article 854

Ort / Verlag

Vienna: Springer Vienna

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A colorimetric array for metal ions is described that is based on the de-aggregation of papain-capped gold nanoparticles (AuNPs) for discrimination of metal ions. The functionalized AuNPs were used as colorimetric probes, and three chelating agents (tripolyphosphate, citrate, and ethylenediamine tetraacetate were employed as the recognition receptors. In the absence of metal ions (Fe 3+ , Cr 3+ , Co 2+ , Mg 2+ , Pb 2+ , Ca 2+ , Zn 2+ , Ti 4+ , and Sn 4+ were studied), the capped AuNPs are well dispersed in solution. In the presence of these ions, the metal ions bind papain and cause the AuNPs to aggregate. This causes a color change from red to purple. Different chelating agents induce different affinities between metal ions and papain. This results in distinct colorimetric response patterns. Linear discriminant analysis is used to discriminate the various metal ions on a three-dimensional spatial dispersion graph. Graphical abstract A colorimetric method is described for discrimination of metal ions. It is based on the chelation reaction between sensing receptors and metal ion-induced papain-functionalized AuNP deaggregation.