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- W2057707535 abstract "This study describes the use of 11-mercaptoundecanoic acid–capped gold nanoparticles (MUA–AuNPs) for selective extraction of melamine prior to analysis by capillary electrophoresis with UV detection. The highest degree of melamine-induced aggregation of MUA–AuNPs was found to occur at pH 5.0, indicating that the NP aggregation is mainly because of hydrogen bonding between the carboxylate groups of MUA and the amine groups of melamine. Moreover, the degree of melamine-induced NP aggregation gradually increased when the chain length of the mercaptoalkanoic acid was increased from two to 12 carbon atoms. At pH 5.0, the extraction efficiency of melamine was highly dependent on the concentration of MUA–AuNPs, the concentration of dithiothreitol (DTT), the extraction time between MUA–AuNPs and melamine, and the incubation time between melamine-adsorbed AuNPs and DTT. The separation of the extracted melamine and DTT (releasing agent) was accomplished using a solution of 10 mM phosphate (pH 6.0) containing 1.6% (v/v) poly(diallyldimethylammonium chloride). Under the optimum extraction and separation conditions, the limit of detection at a signal-to-noise ratio of 3 was estimated to be 77 pM for melamine, with linear range of 1–1000 nM. The proposed method was successfully applied to the determination of melamine in tap water and in milk." @default.
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- W2057707535 date "2010-12-01" @default.
- W2057707535 modified "2023-10-17" @default.
- W2057707535 title "Selective extraction of melamine using 11-mercaptoundecanoic acid–capped gold nanoparticles followed by capillary electrophoresis" @default.
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- W2057707535 doi "https://doi.org/10.1016/j.chroma.2010.10.023" @default.
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