Amino acid analysis using disposable copper nanoparticle plated electrodes.
A disposable copper nanoparticle-plated screen-printed carbon electrode (designated as Cun-SPE(100-nm)) provides a new material for the determination of native amino acids. All 20 underivatized amino acids can be sensitively determined at 0.0 V vs. Ag/AgCl in pH 8 phosphate buffer solution. The precisely controlled copper nanoparticles can boost up the CuIIO/CuI2O redox signal on the working surface without any prior pretreatment procedure. The formation of a reversible 1:1 CuIIO-amino acid complex on the Cun-SPE(100-nm) was proposed to play a key role in the reaction mechanism. Stable detection responses were obtained for all amino acids by flow injection analysis with detection limits (S/N = 3) that lie in the range of 24 nM-2.7 microM. Selected amino acids from six representative chemical natures were separated by HPLC and detected at the Cun-SPE(100-nm) with promising results.
Zen
Jyh-Myng
JM
Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan. jmzen@dragon.nchu.edu.tw
Hsu
Cheng-Teng
CT
Senthil Kumar
Annamalai
A
Lyuu
Hueih-Jing
HJ
Lin
Ker-Yun
KY
D000596:Amino Acids / Q000032:analysis*; D003300:Copper; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D008839:Microelectrodes; D036103:Nanotechnology
D000596:Amino Acids; D003300:Copper