am5071283_si_001.pdf (1.36 MB)
Colorimetric Sensor Array Based on Gold Nanoparticles and Amino Acids for Identification of Toxic Metal Ions in Water
journal contribution
posted on 2014-11-12, 00:00 authored by Gulsu Sener, Lokman Uzun, Adil DenizliA facile colorimetric sensor array
for detection of multiple toxic heavy metal ions (Hg2+,
Cd2+, Fe3+, Pb2+, Al3+, Cu2+, and Cr3+) in water is demonstrated
using 11-mercaptoundecanoic acid (MUA)-capped gold nanoparticles (AuNPs)
and five amino acids (lysine, cysteine, histidine, tyrosine, and arginine).
The presence of amino acids (which have functional groups that can
form complexes with metal ions and MUA) regulates the aggregation
of MUA-capped particles; it can either enhance or diminish the particle
aggregation. The combinatorial colorimetric response of all channels
of the sensor array (i.e., color change in each of AuNP and amino
acid couples) enables naked-eye discrimination of all of the metal
ions tested in this study with excellent selectivity.