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Gold nanoparticles (GNPs) have been stabilized with nonionic surfactant ligands, i.e., Brij @ 35, and their aggregation could be induced rapidly and selectively by biologically active low-molecular-mass thiols including sulphydryl-containing amino acids (cysteine and homocysteine) and small peptides (glutathione, cysteinylglycine, and glutamylcysteine). A new postcolumn detection method has...
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