Aggregation of fluorosurfactant-capped gold nanoparticles could be induced selectively by cysteine and homocysteine and, when solution ionic strength was low, the kinetics of homocysteine-induced aggregation of large size nanoparticles (approximately 40 nm) was much faster than that induced by cysteine, leading to specific detection of homocysteine in the presence of excess cysteine.
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Lu et al. (2007) studied this question.
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